Annotation of src/sys/kern/uipc_socket.c, Revision 1.204
1.204 ! christos 1: /* $NetBSD: uipc_socket.c,v 1.203 2011/02/01 01:39:20 matt Exp $ */
1.64 thorpej 2:
3: /*-
1.188 ad 4: * Copyright (c) 2002, 2007, 2008, 2009 The NetBSD Foundation, Inc.
1.64 thorpej 5: * All rights reserved.
6: *
7: * This code is derived from software contributed to The NetBSD Foundation
1.188 ad 8: * by Jason R. Thorpe of Wasabi Systems, Inc, and by Andrew Doran.
1.64 thorpej 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>
1.204 ! christos 66: __KERNEL_RCSID(0, "$NetBSD: uipc_socket.c,v 1.203 2011/02/01 01:39:20 matt Exp $");
1.64 thorpej 67:
1.179 christos 68: #include "opt_compat_netbsd.h"
1.64 thorpej 69: #include "opt_sock_counters.h"
70: #include "opt_sosend_loan.h"
1.81 martin 71: #include "opt_mbuftrace.h"
1.84 ragge 72: #include "opt_somaxkva.h"
1.167 ad 73: #include "opt_multiprocessor.h" /* XXX */
1.1 cgd 74:
1.9 mycroft 75: #include <sys/param.h>
76: #include <sys/systm.h>
77: #include <sys/proc.h>
78: #include <sys/file.h>
1.142 dyoung 79: #include <sys/filedesc.h>
1.173 plunky 80: #include <sys/kmem.h>
1.9 mycroft 81: #include <sys/mbuf.h>
82: #include <sys/domain.h>
83: #include <sys/kernel.h>
84: #include <sys/protosw.h>
85: #include <sys/socket.h>
86: #include <sys/socketvar.h>
1.21 christos 87: #include <sys/signalvar.h>
1.9 mycroft 88: #include <sys/resourcevar.h>
1.174 pooka 89: #include <sys/uidinfo.h>
1.72 jdolecek 90: #include <sys/event.h>
1.89 christos 91: #include <sys/poll.h>
1.118 elad 92: #include <sys/kauth.h>
1.136 ad 93: #include <sys/mutex.h>
94: #include <sys/condvar.h>
1.37 thorpej 95:
1.179 christos 96: #ifdef COMPAT_50
97: #include <compat/sys/time.h>
1.184 christos 98: #include <compat/sys/socket.h>
1.179 christos 99: #endif
100:
1.202 uebayasi 101: #include <uvm/uvm_extern.h>
102: #include <uvm/uvm_loan.h>
103: #include <uvm/uvm_page.h>
1.64 thorpej 104:
1.77 thorpej 105: MALLOC_DEFINE(M_SOOPTS, "soopts", "socket options");
106: MALLOC_DEFINE(M_SONAME, "soname", "socket name");
1.37 thorpej 107:
1.142 dyoung 108: extern const struct fileops socketops;
109:
1.54 lukem 110: extern int somaxconn; /* patchable (XXX sysctl) */
111: int somaxconn = SOMAXCONN;
1.160 ad 112: kmutex_t *softnet_lock;
1.49 jonathan 113:
1.64 thorpej 114: #ifdef SOSEND_COUNTERS
115: #include <sys/device.h>
116:
1.113 thorpej 117: static struct evcnt sosend_loan_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64 thorpej 118: NULL, "sosend", "loan big");
1.113 thorpej 119: static struct evcnt sosend_copy_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64 thorpej 120: NULL, "sosend", "copy big");
1.113 thorpej 121: static struct evcnt sosend_copy_small = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64 thorpej 122: NULL, "sosend", "copy small");
1.113 thorpej 123: static struct evcnt sosend_kvalimit = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64 thorpej 124: NULL, "sosend", "kva limit");
125:
126: #define SOSEND_COUNTER_INCR(ev) (ev)->ev_count++
127:
1.101 matt 128: EVCNT_ATTACH_STATIC(sosend_loan_big);
129: EVCNT_ATTACH_STATIC(sosend_copy_big);
130: EVCNT_ATTACH_STATIC(sosend_copy_small);
131: EVCNT_ATTACH_STATIC(sosend_kvalimit);
1.64 thorpej 132: #else
133:
134: #define SOSEND_COUNTER_INCR(ev) /* nothing */
135:
136: #endif /* SOSEND_COUNTERS */
137:
1.119 yamt 138: static struct callback_entry sokva_reclaimerentry;
1.1 cgd 139:
1.167 ad 140: #if defined(SOSEND_NO_LOAN) || defined(MULTIPROCESSOR)
1.121 yamt 141: int sock_loan_thresh = -1;
1.71 thorpej 142: #else
1.121 yamt 143: int sock_loan_thresh = 4096;
1.65 thorpej 144: #endif
1.64 thorpej 145:
1.136 ad 146: static kmutex_t so_pendfree_lock;
1.113 thorpej 147: static struct mbuf *so_pendfree;
1.64 thorpej 148:
1.84 ragge 149: #ifndef SOMAXKVA
150: #define SOMAXKVA (16 * 1024 * 1024)
151: #endif
152: int somaxkva = SOMAXKVA;
1.113 thorpej 153: static int socurkva;
1.136 ad 154: static kcondvar_t socurkva_cv;
1.64 thorpej 155:
1.191 elad 156: static kauth_listener_t socket_listener;
157:
1.64 thorpej 158: #define SOCK_LOAN_CHUNK 65536
159:
1.117 yamt 160: static size_t sodopendfree(void);
161: static size_t sodopendfreel(void);
1.93 yamt 162:
1.178 pooka 163: static void sysctl_kern_somaxkva_setup(void);
164: static struct sysctllog *socket_sysctllog;
165:
1.113 thorpej 166: static vsize_t
1.129 yamt 167: sokvareserve(struct socket *so, vsize_t len)
1.80 yamt 168: {
1.98 christos 169: int error;
1.80 yamt 170:
1.136 ad 171: mutex_enter(&so_pendfree_lock);
1.80 yamt 172: while (socurkva + len > somaxkva) {
1.93 yamt 173: size_t freed;
174:
175: /*
176: * try to do pendfree.
177: */
178:
1.117 yamt 179: freed = sodopendfreel();
1.93 yamt 180:
181: /*
182: * if some kva was freed, try again.
183: */
184:
185: if (freed)
1.80 yamt 186: continue;
1.93 yamt 187:
1.80 yamt 188: SOSEND_COUNTER_INCR(&sosend_kvalimit);
1.136 ad 189: error = cv_wait_sig(&socurkva_cv, &so_pendfree_lock);
1.98 christos 190: if (error) {
191: len = 0;
192: break;
193: }
1.80 yamt 194: }
1.93 yamt 195: socurkva += len;
1.136 ad 196: mutex_exit(&so_pendfree_lock);
1.98 christos 197: return len;
1.95 yamt 198: }
199:
1.113 thorpej 200: static void
1.95 yamt 201: sokvaunreserve(vsize_t len)
202: {
203:
1.136 ad 204: mutex_enter(&so_pendfree_lock);
1.95 yamt 205: socurkva -= len;
1.136 ad 206: cv_broadcast(&socurkva_cv);
207: mutex_exit(&so_pendfree_lock);
1.95 yamt 208: }
209:
210: /*
211: * sokvaalloc: allocate kva for loan.
212: */
213:
214: vaddr_t
215: sokvaalloc(vsize_t len, struct socket *so)
216: {
217: vaddr_t lva;
218:
219: /*
220: * reserve kva.
221: */
222:
1.98 christos 223: if (sokvareserve(so, len) == 0)
224: return 0;
1.93 yamt 225:
226: /*
227: * allocate kva.
228: */
1.80 yamt 229:
1.109 yamt 230: lva = uvm_km_alloc(kernel_map, len, 0, UVM_KMF_VAONLY | UVM_KMF_WAITVA);
1.95 yamt 231: if (lva == 0) {
232: sokvaunreserve(len);
1.80 yamt 233: return (0);
1.95 yamt 234: }
1.80 yamt 235:
236: return lva;
237: }
238:
1.93 yamt 239: /*
240: * sokvafree: free kva for loan.
241: */
242:
1.80 yamt 243: void
244: sokvafree(vaddr_t sva, vsize_t len)
245: {
1.93 yamt 246:
247: /*
248: * free kva.
249: */
1.80 yamt 250:
1.109 yamt 251: uvm_km_free(kernel_map, sva, len, UVM_KMF_VAONLY);
1.93 yamt 252:
253: /*
254: * unreserve kva.
255: */
256:
1.95 yamt 257: sokvaunreserve(len);
1.80 yamt 258: }
259:
1.64 thorpej 260: static void
1.134 christos 261: sodoloanfree(struct vm_page **pgs, void *buf, size_t size)
1.64 thorpej 262: {
1.156 yamt 263: vaddr_t sva, eva;
1.64 thorpej 264: vsize_t len;
1.156 yamt 265: int npgs;
266:
267: KASSERT(pgs != NULL);
1.64 thorpej 268:
269: eva = round_page((vaddr_t) buf + size);
270: sva = trunc_page((vaddr_t) buf);
271: len = eva - sva;
272: npgs = len >> PAGE_SHIFT;
273:
274: pmap_kremove(sva, len);
275: pmap_update(pmap_kernel());
276: uvm_unloan(pgs, npgs, UVM_LOAN_TOPAGE);
1.80 yamt 277: sokvafree(sva, len);
1.64 thorpej 278: }
279:
280: static size_t
1.152 matt 281: sodopendfree(void)
1.64 thorpej 282: {
1.93 yamt 283: size_t rv;
1.64 thorpej 284:
1.160 ad 285: if (__predict_true(so_pendfree == NULL))
286: return 0;
287:
1.136 ad 288: mutex_enter(&so_pendfree_lock);
1.117 yamt 289: rv = sodopendfreel();
1.136 ad 290: mutex_exit(&so_pendfree_lock);
1.93 yamt 291:
292: return rv;
293: }
294:
295: /*
296: * sodopendfreel: free mbufs on "pendfree" list.
1.136 ad 297: * unlock and relock so_pendfree_lock when freeing mbufs.
1.93 yamt 298: *
1.136 ad 299: * => called with so_pendfree_lock held.
1.93 yamt 300: */
301:
302: static size_t
1.152 matt 303: sodopendfreel(void)
1.93 yamt 304: {
1.137 ad 305: struct mbuf *m, *next;
1.93 yamt 306: size_t rv = 0;
307:
1.136 ad 308: KASSERT(mutex_owned(&so_pendfree_lock));
1.64 thorpej 309:
1.137 ad 310: while (so_pendfree != NULL) {
1.64 thorpej 311: m = so_pendfree;
1.93 yamt 312: so_pendfree = NULL;
1.136 ad 313: mutex_exit(&so_pendfree_lock);
1.93 yamt 314:
315: for (; m != NULL; m = next) {
316: next = m->m_next;
1.156 yamt 317: KASSERT((~m->m_flags & (M_EXT|M_EXT_PAGES)) == 0);
318: KASSERT(m->m_ext.ext_refcnt == 0);
1.93 yamt 319:
320: rv += m->m_ext.ext_size;
1.156 yamt 321: sodoloanfree(m->m_ext.ext_pgs, m->m_ext.ext_buf,
1.93 yamt 322: m->m_ext.ext_size);
1.145 ad 323: pool_cache_put(mb_cache, m);
1.93 yamt 324: }
1.64 thorpej 325:
1.136 ad 326: mutex_enter(&so_pendfree_lock);
1.64 thorpej 327: }
328:
329: return (rv);
330: }
331:
1.80 yamt 332: void
1.134 christos 333: soloanfree(struct mbuf *m, void *buf, size_t size, void *arg)
1.64 thorpej 334: {
335:
1.156 yamt 336: KASSERT(m != NULL);
1.64 thorpej 337:
1.93 yamt 338: /*
339: * postpone freeing mbuf.
340: *
341: * we can't do it in interrupt context
342: * because we need to put kva back to kernel_map.
343: */
344:
1.136 ad 345: mutex_enter(&so_pendfree_lock);
1.92 yamt 346: m->m_next = so_pendfree;
347: so_pendfree = m;
1.136 ad 348: cv_broadcast(&socurkva_cv);
349: mutex_exit(&so_pendfree_lock);
1.64 thorpej 350: }
351:
352: static long
353: sosend_loan(struct socket *so, struct uio *uio, struct mbuf *m, long space)
354: {
355: struct iovec *iov = uio->uio_iov;
356: vaddr_t sva, eva;
357: vsize_t len;
1.156 yamt 358: vaddr_t lva;
359: int npgs, error;
360: vaddr_t va;
361: int i;
1.64 thorpej 362:
1.116 yamt 363: if (VMSPACE_IS_KERNEL_P(uio->uio_vmspace))
1.64 thorpej 364: return (0);
365:
366: if (iov->iov_len < (size_t) space)
367: space = iov->iov_len;
368: if (space > SOCK_LOAN_CHUNK)
369: space = SOCK_LOAN_CHUNK;
370:
371: eva = round_page((vaddr_t) iov->iov_base + space);
372: sva = trunc_page((vaddr_t) iov->iov_base);
373: len = eva - sva;
374: npgs = len >> PAGE_SHIFT;
375:
1.79 thorpej 376: KASSERT(npgs <= M_EXT_MAXPAGES);
377:
1.80 yamt 378: lva = sokvaalloc(len, so);
1.64 thorpej 379: if (lva == 0)
1.80 yamt 380: return 0;
1.64 thorpej 381:
1.116 yamt 382: error = uvm_loan(&uio->uio_vmspace->vm_map, sva, len,
1.79 thorpej 383: m->m_ext.ext_pgs, UVM_LOAN_TOPAGE);
1.64 thorpej 384: if (error) {
1.80 yamt 385: sokvafree(lva, len);
1.64 thorpej 386: return (0);
387: }
388:
389: for (i = 0, va = lva; i < npgs; i++, va += PAGE_SIZE)
1.79 thorpej 390: pmap_kenter_pa(va, VM_PAGE_TO_PHYS(m->m_ext.ext_pgs[i]),
1.194 cegger 391: VM_PROT_READ, 0);
1.64 thorpej 392: pmap_update(pmap_kernel());
393:
394: lva += (vaddr_t) iov->iov_base & PAGE_MASK;
395:
1.134 christos 396: MEXTADD(m, (void *) lva, space, M_MBUF, soloanfree, so);
1.79 thorpej 397: m->m_flags |= M_EXT_PAGES | M_EXT_ROMAP;
1.64 thorpej 398:
399: uio->uio_resid -= space;
400: /* uio_offset not updated, not set/used for write(2) */
1.134 christos 401: uio->uio_iov->iov_base = (char *)uio->uio_iov->iov_base + space;
1.64 thorpej 402: uio->uio_iov->iov_len -= space;
403: if (uio->uio_iov->iov_len == 0) {
404: uio->uio_iov++;
405: uio->uio_iovcnt--;
406: }
407:
408: return (space);
409: }
410:
1.119 yamt 411: static int
1.129 yamt 412: sokva_reclaim_callback(struct callback_entry *ce, void *obj, void *arg)
1.119 yamt 413: {
414:
415: KASSERT(ce == &sokva_reclaimerentry);
416: KASSERT(obj == NULL);
417:
418: sodopendfree();
419: if (!vm_map_starved_p(kernel_map)) {
420: return CALLBACK_CHAIN_ABORT;
421: }
422: return CALLBACK_CHAIN_CONTINUE;
423: }
424:
1.142 dyoung 425: struct mbuf *
1.147 dyoung 426: getsombuf(struct socket *so, int type)
1.142 dyoung 427: {
428: struct mbuf *m;
429:
1.147 dyoung 430: m = m_get(M_WAIT, type);
1.142 dyoung 431: MCLAIM(m, so->so_mowner);
432: return m;
433: }
434:
1.191 elad 435: static int
436: socket_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie,
437: void *arg0, void *arg1, void *arg2, void *arg3)
438: {
439: int result;
440: enum kauth_network_req req;
441:
442: result = KAUTH_RESULT_DEFER;
443: req = (enum kauth_network_req)arg0;
444:
1.193 elad 445: if ((action != KAUTH_NETWORK_SOCKET) &&
446: (action != KAUTH_NETWORK_BIND))
1.191 elad 447: return result;
448:
449: switch (req) {
1.193 elad 450: case KAUTH_REQ_NETWORK_BIND_PORT:
451: result = KAUTH_RESULT_ALLOW;
452: break;
453:
1.191 elad 454: case KAUTH_REQ_NETWORK_SOCKET_DROP: {
455: /* Normal users can only drop their own connections. */
456: struct socket *so = (struct socket *)arg1;
457:
1.199 elad 458: if (proc_uidmatch(cred, so->so_cred))
1.191 elad 459: result = KAUTH_RESULT_ALLOW;
460:
461: break;
462: }
463:
464: case KAUTH_REQ_NETWORK_SOCKET_OPEN:
465: /* We allow "raw" routing/bluetooth sockets to anyone. */
1.203 matt 466: if ((u_long)arg1 == PF_ROUTE || (u_long)arg1 == PF_OROUTE
467: || (u_long)arg1 == PF_BLUETOOTH) {
1.191 elad 468: result = KAUTH_RESULT_ALLOW;
1.203 matt 469: } else {
1.191 elad 470: /* Privileged, let secmodel handle this. */
471: if ((u_long)arg2 == SOCK_RAW)
472: break;
473: }
474:
475: result = KAUTH_RESULT_ALLOW;
476:
477: break;
478:
1.192 elad 479: case KAUTH_REQ_NETWORK_SOCKET_CANSEE:
480: result = KAUTH_RESULT_ALLOW;
481:
482: break;
483:
1.191 elad 484: default:
485: break;
486: }
487:
488: return result;
489: }
490:
1.119 yamt 491: void
492: soinit(void)
493: {
494:
1.178 pooka 495: sysctl_kern_somaxkva_setup();
496:
1.148 ad 497: mutex_init(&so_pendfree_lock, MUTEX_DEFAULT, IPL_VM);
1.160 ad 498: softnet_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
1.136 ad 499: cv_init(&socurkva_cv, "sokva");
1.166 ad 500: soinit2();
1.136 ad 501:
1.119 yamt 502: /* Set the initial adjusted socket buffer size. */
503: if (sb_max_set(sb_max))
504: panic("bad initial sb_max value: %lu", sb_max);
505:
506: callback_register(&vm_map_to_kernel(kernel_map)->vmk_reclaim_callback,
507: &sokva_reclaimerentry, NULL, sokva_reclaim_callback);
1.191 elad 508:
509: socket_listener = kauth_listen_scope(KAUTH_SCOPE_NETWORK,
510: socket_listener_cb, NULL);
1.119 yamt 511: }
512:
1.1 cgd 513: /*
514: * Socket operation routines.
515: * These routines are called by the routines in
516: * sys_socket.c or from a system process, and
517: * implement the semantics of socket operations by
518: * switching out to the protocol specific routines.
519: */
520: /*ARGSUSED*/
1.3 andrew 521: int
1.160 ad 522: socreate(int dom, struct socket **aso, int type, int proto, struct lwp *l,
523: struct socket *lockso)
1.1 cgd 524: {
1.99 matt 525: const struct protosw *prp;
1.54 lukem 526: struct socket *so;
1.115 yamt 527: uid_t uid;
1.160 ad 528: int error;
529: kmutex_t *lock;
1.1 cgd 530:
1.132 elad 531: error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_SOCKET,
532: KAUTH_REQ_NETWORK_SOCKET_OPEN, KAUTH_ARG(dom), KAUTH_ARG(type),
533: KAUTH_ARG(proto));
1.140 dyoung 534: if (error != 0)
535: return error;
1.127 elad 536:
1.1 cgd 537: if (proto)
538: prp = pffindproto(dom, proto, type);
539: else
540: prp = pffindtype(dom, type);
1.140 dyoung 541: if (prp == NULL) {
1.120 ginsbach 542: /* no support for domain */
543: if (pffinddomain(dom) == 0)
1.140 dyoung 544: return EAFNOSUPPORT;
1.120 ginsbach 545: /* no support for socket type */
546: if (proto == 0 && type != 0)
1.140 dyoung 547: return EPROTOTYPE;
548: return EPROTONOSUPPORT;
1.120 ginsbach 549: }
1.140 dyoung 550: if (prp->pr_usrreq == NULL)
551: return EPROTONOSUPPORT;
1.1 cgd 552: if (prp->pr_type != type)
1.140 dyoung 553: return EPROTOTYPE;
1.160 ad 554:
555: so = soget(true);
1.1 cgd 556: so->so_type = type;
557: so->so_proto = prp;
1.33 matt 558: so->so_send = sosend;
559: so->so_receive = soreceive;
1.78 matt 560: #ifdef MBUFTRACE
561: so->so_rcv.sb_mowner = &prp->pr_domain->dom_mowner;
562: so->so_snd.sb_mowner = &prp->pr_domain->dom_mowner;
563: so->so_mowner = &prp->pr_domain->dom_mowner;
564: #endif
1.138 rmind 565: uid = kauth_cred_geteuid(l->l_cred);
1.115 yamt 566: so->so_uidinfo = uid_find(uid);
1.168 yamt 567: so->so_cpid = l->l_proc->p_pid;
1.160 ad 568: if (lockso != NULL) {
569: /* Caller wants us to share a lock. */
570: lock = lockso->so_lock;
571: so->so_lock = lock;
572: mutex_obj_hold(lock);
573: mutex_enter(lock);
574: } else {
575: /* Lock assigned and taken during PRU_ATTACH. */
576: }
1.140 dyoung 577: error = (*prp->pr_usrreq)(so, PRU_ATTACH, NULL,
578: (struct mbuf *)(long)proto, NULL, l);
1.160 ad 579: KASSERT(solocked(so));
1.140 dyoung 580: if (error != 0) {
1.1 cgd 581: so->so_state |= SS_NOFDREF;
582: sofree(so);
1.140 dyoung 583: return error;
1.1 cgd 584: }
1.198 elad 585: so->so_cred = kauth_cred_dup(l->l_cred);
1.160 ad 586: sounlock(so);
1.1 cgd 587: *aso = so;
1.140 dyoung 588: return 0;
1.1 cgd 589: }
590:
1.142 dyoung 591: /* On success, write file descriptor to fdout and return zero. On
592: * failure, return non-zero; *fdout will be undefined.
593: */
594: int
595: fsocreate(int domain, struct socket **sop, int type, int protocol,
596: struct lwp *l, int *fdout)
597: {
598: struct socket *so;
599: struct file *fp;
600: int fd, error;
1.204 ! christos 601: int flags = type & SOCK_FLAGS_MASK;
1.142 dyoung 602:
1.204 ! christos 603: type &= ~SOCK_FLAGS_MASK;
1.155 ad 604: if ((error = fd_allocfile(&fp, &fd)) != 0)
1.204 ! christos 605: return error;
! 606: fd_set_exclose(l, fd, (flags & SOCK_CLOEXEC) != 0);
! 607: fp->f_flag = FREAD|FWRITE|((flags & SOCK_NONBLOCK) ? FNONBLOCK : 0);
1.142 dyoung 608: fp->f_type = DTYPE_SOCKET;
609: fp->f_ops = &socketops;
1.160 ad 610: error = socreate(domain, &so, type, protocol, l, NULL);
1.142 dyoung 611: if (error != 0) {
1.155 ad 612: fd_abort(curproc, fp, fd);
1.142 dyoung 613: } else {
614: if (sop != NULL)
615: *sop = so;
616: fp->f_data = so;
1.155 ad 617: fd_affix(curproc, fp, fd);
1.142 dyoung 618: *fdout = fd;
619: }
620: return error;
621: }
622:
1.3 andrew 623: int
1.190 dyoung 624: sofamily(const struct socket *so)
625: {
626: const struct protosw *pr;
627: const struct domain *dom;
628:
629: if ((pr = so->so_proto) == NULL)
630: return AF_UNSPEC;
631: if ((dom = pr->pr_domain) == NULL)
632: return AF_UNSPEC;
633: return dom->dom_family;
634: }
635:
636: int
1.114 christos 637: sobind(struct socket *so, struct mbuf *nam, struct lwp *l)
1.1 cgd 638: {
1.160 ad 639: int error;
1.1 cgd 640:
1.160 ad 641: solock(so);
1.140 dyoung 642: error = (*so->so_proto->pr_usrreq)(so, PRU_BIND, NULL, nam, NULL, l);
1.160 ad 643: sounlock(so);
1.140 dyoung 644: return error;
1.1 cgd 645: }
646:
1.3 andrew 647: int
1.150 elad 648: solisten(struct socket *so, int backlog, struct lwp *l)
1.1 cgd 649: {
1.160 ad 650: int error;
1.1 cgd 651:
1.160 ad 652: solock(so);
1.158 ad 653: if ((so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING |
1.163 ad 654: SS_ISDISCONNECTING)) != 0) {
655: sounlock(so);
1.158 ad 656: return (EOPNOTSUPP);
1.163 ad 657: }
1.140 dyoung 658: error = (*so->so_proto->pr_usrreq)(so, PRU_LISTEN, NULL,
1.150 elad 659: NULL, NULL, l);
1.140 dyoung 660: if (error != 0) {
1.160 ad 661: sounlock(so);
1.140 dyoung 662: return error;
1.1 cgd 663: }
1.63 matt 664: if (TAILQ_EMPTY(&so->so_q))
1.1 cgd 665: so->so_options |= SO_ACCEPTCONN;
666: if (backlog < 0)
667: backlog = 0;
1.49 jonathan 668: so->so_qlimit = min(backlog, somaxconn);
1.160 ad 669: sounlock(so);
1.140 dyoung 670: return 0;
1.1 cgd 671: }
672:
1.21 christos 673: void
1.54 lukem 674: sofree(struct socket *so)
1.1 cgd 675: {
1.161 ad 676: u_int refs;
1.1 cgd 677:
1.160 ad 678: KASSERT(solocked(so));
679:
680: if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0) {
681: sounlock(so);
1.1 cgd 682: return;
1.160 ad 683: }
1.43 mycroft 684: if (so->so_head) {
685: /*
686: * We must not decommission a socket that's on the accept(2)
687: * queue. If we do, then accept(2) may hang after select(2)
688: * indicated that the listening socket was ready.
689: */
1.160 ad 690: if (!soqremque(so, 0)) {
691: sounlock(so);
1.43 mycroft 692: return;
1.160 ad 693: }
1.43 mycroft 694: }
1.98 christos 695: if (so->so_rcv.sb_hiwat)
1.110 christos 696: (void)chgsbsize(so->so_uidinfo, &so->so_rcv.sb_hiwat, 0,
1.98 christos 697: RLIM_INFINITY);
698: if (so->so_snd.sb_hiwat)
1.110 christos 699: (void)chgsbsize(so->so_uidinfo, &so->so_snd.sb_hiwat, 0,
1.98 christos 700: RLIM_INFINITY);
701: sbrelease(&so->so_snd, so);
1.160 ad 702: KASSERT(!cv_has_waiters(&so->so_cv));
703: KASSERT(!cv_has_waiters(&so->so_rcv.sb_cv));
704: KASSERT(!cv_has_waiters(&so->so_snd.sb_cv));
1.1 cgd 705: sorflush(so);
1.161 ad 706: refs = so->so_aborting; /* XXX */
1.177 ad 707: /* Remove acccept filter if one is present. */
1.170 tls 708: if (so->so_accf != NULL)
1.177 ad 709: (void)accept_filt_clear(so);
1.160 ad 710: sounlock(so);
1.161 ad 711: if (refs == 0) /* XXX */
712: soput(so);
1.1 cgd 713: }
714:
715: /*
716: * Close a socket on last file table reference removal.
717: * Initiate disconnect if connected.
718: * Free socket when disconnect complete.
719: */
1.3 andrew 720: int
1.54 lukem 721: soclose(struct socket *so)
1.1 cgd 722: {
1.54 lukem 723: struct socket *so2;
1.160 ad 724: int error;
725: int error2;
1.1 cgd 726:
1.54 lukem 727: error = 0;
1.160 ad 728: solock(so);
1.1 cgd 729: if (so->so_options & SO_ACCEPTCONN) {
1.172 ad 730: for (;;) {
731: if ((so2 = TAILQ_FIRST(&so->so_q0)) != 0) {
1.160 ad 732: KASSERT(solocked2(so, so2));
733: (void) soqremque(so2, 0);
734: /* soabort drops the lock. */
735: (void) soabort(so2);
736: solock(so);
1.172 ad 737: continue;
1.160 ad 738: }
1.172 ad 739: if ((so2 = TAILQ_FIRST(&so->so_q)) != 0) {
1.160 ad 740: KASSERT(solocked2(so, so2));
741: (void) soqremque(so2, 1);
742: /* soabort drops the lock. */
743: (void) soabort(so2);
744: solock(so);
1.172 ad 745: continue;
1.160 ad 746: }
1.172 ad 747: break;
748: }
1.1 cgd 749: }
750: if (so->so_pcb == 0)
751: goto discard;
752: if (so->so_state & SS_ISCONNECTED) {
753: if ((so->so_state & SS_ISDISCONNECTING) == 0) {
754: error = sodisconnect(so);
755: if (error)
756: goto drop;
757: }
758: if (so->so_options & SO_LINGER) {
1.151 ad 759: if ((so->so_state & SS_ISDISCONNECTING) && so->so_nbio)
1.1 cgd 760: goto drop;
1.21 christos 761: while (so->so_state & SS_ISCONNECTED) {
1.185 yamt 762: error = sowait(so, true, so->so_linger * hz);
1.21 christos 763: if (error)
1.1 cgd 764: break;
1.21 christos 765: }
1.1 cgd 766: }
767: }
1.54 lukem 768: drop:
1.1 cgd 769: if (so->so_pcb) {
1.160 ad 770: error2 = (*so->so_proto->pr_usrreq)(so, PRU_DETACH,
1.140 dyoung 771: NULL, NULL, NULL, NULL);
1.1 cgd 772: if (error == 0)
773: error = error2;
774: }
1.54 lukem 775: discard:
1.1 cgd 776: if (so->so_state & SS_NOFDREF)
777: panic("soclose: NOFDREF");
1.198 elad 778: kauth_cred_free(so->so_cred);
1.1 cgd 779: so->so_state |= SS_NOFDREF;
780: sofree(so);
781: return (error);
782: }
783:
784: /*
1.160 ad 785: * Must be called with the socket locked.. Will return with it unlocked.
1.1 cgd 786: */
1.3 andrew 787: int
1.54 lukem 788: soabort(struct socket *so)
1.1 cgd 789: {
1.161 ad 790: u_int refs;
1.139 yamt 791: int error;
1.160 ad 792:
793: KASSERT(solocked(so));
794: KASSERT(so->so_head == NULL);
1.1 cgd 795:
1.161 ad 796: so->so_aborting++; /* XXX */
1.140 dyoung 797: error = (*so->so_proto->pr_usrreq)(so, PRU_ABORT, NULL,
798: NULL, NULL, NULL);
1.161 ad 799: refs = --so->so_aborting; /* XXX */
1.164 drochner 800: if (error || (refs == 0)) {
1.139 yamt 801: sofree(so);
1.160 ad 802: } else {
803: sounlock(so);
1.139 yamt 804: }
805: return error;
1.1 cgd 806: }
807:
1.3 andrew 808: int
1.54 lukem 809: soaccept(struct socket *so, struct mbuf *nam)
1.1 cgd 810: {
1.160 ad 811: int error;
812:
813: KASSERT(solocked(so));
1.1 cgd 814:
1.54 lukem 815: error = 0;
1.1 cgd 816: if ((so->so_state & SS_NOFDREF) == 0)
817: panic("soaccept: !NOFDREF");
818: so->so_state &= ~SS_NOFDREF;
1.55 thorpej 819: if ((so->so_state & SS_ISDISCONNECTED) == 0 ||
820: (so->so_proto->pr_flags & PR_ABRTACPTDIS) == 0)
1.41 mycroft 821: error = (*so->so_proto->pr_usrreq)(so, PRU_ACCEPT,
1.140 dyoung 822: NULL, nam, NULL, NULL);
1.41 mycroft 823: else
1.53 itojun 824: error = ECONNABORTED;
1.52 itojun 825:
1.1 cgd 826: return (error);
827: }
828:
1.3 andrew 829: int
1.114 christos 830: soconnect(struct socket *so, struct mbuf *nam, struct lwp *l)
1.1 cgd 831: {
1.160 ad 832: int error;
833:
834: KASSERT(solocked(so));
1.1 cgd 835:
836: if (so->so_options & SO_ACCEPTCONN)
837: return (EOPNOTSUPP);
838: /*
839: * If protocol is connection-based, can only connect once.
840: * Otherwise, if connected, try to disconnect first.
841: * This allows user to disconnect by connecting to, e.g.,
842: * a null address.
843: */
844: if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
845: ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
846: (error = sodisconnect(so))))
847: error = EISCONN;
848: else
849: error = (*so->so_proto->pr_usrreq)(so, PRU_CONNECT,
1.140 dyoung 850: NULL, nam, NULL, l);
1.1 cgd 851: return (error);
852: }
853:
1.3 andrew 854: int
1.54 lukem 855: soconnect2(struct socket *so1, struct socket *so2)
1.1 cgd 856: {
1.160 ad 857: int error;
858:
859: KASSERT(solocked2(so1, so2));
1.1 cgd 860:
1.22 mycroft 861: error = (*so1->so_proto->pr_usrreq)(so1, PRU_CONNECT2,
1.140 dyoung 862: NULL, (struct mbuf *)so2, NULL, NULL);
1.1 cgd 863: return (error);
864: }
865:
1.3 andrew 866: int
1.54 lukem 867: sodisconnect(struct socket *so)
1.1 cgd 868: {
1.160 ad 869: int error;
870:
871: KASSERT(solocked(so));
1.1 cgd 872:
873: if ((so->so_state & SS_ISCONNECTED) == 0) {
874: error = ENOTCONN;
1.160 ad 875: } else if (so->so_state & SS_ISDISCONNECTING) {
1.1 cgd 876: error = EALREADY;
1.160 ad 877: } else {
878: error = (*so->so_proto->pr_usrreq)(so, PRU_DISCONNECT,
879: NULL, NULL, NULL, NULL);
1.1 cgd 880: }
1.117 yamt 881: sodopendfree();
1.1 cgd 882: return (error);
883: }
884:
1.15 mycroft 885: #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK)
1.1 cgd 886: /*
887: * Send on a socket.
888: * If send must go all at once and message is larger than
889: * send buffering, then hard error.
890: * Lock against other senders.
891: * If must go all at once and not enough room now, then
892: * inform user that this would block and do nothing.
893: * Otherwise, if nonblocking, send as much as possible.
894: * The data to be sent is described by "uio" if nonzero,
895: * otherwise by the mbuf chain "top" (which must be null
896: * if uio is not). Data provided in mbuf chain must be small
897: * enough to send all at once.
898: *
899: * Returns nonzero on error, timeout or signal; callers
900: * must check for short counts if EINTR/ERESTART are returned.
901: * Data and control buffers are freed on return.
902: */
1.3 andrew 903: int
1.54 lukem 904: sosend(struct socket *so, struct mbuf *addr, struct uio *uio, struct mbuf *top,
1.114 christos 905: struct mbuf *control, int flags, struct lwp *l)
1.1 cgd 906: {
1.54 lukem 907: struct mbuf **mp, *m;
1.114 christos 908: struct proc *p;
1.58 jdolecek 909: long space, len, resid, clen, mlen;
910: int error, s, dontroute, atomic;
1.196 dsl 911: short wakeup_state = 0;
1.54 lukem 912:
1.114 christos 913: p = l->l_proc;
1.117 yamt 914: sodopendfree();
1.160 ad 915: clen = 0;
1.64 thorpej 916:
1.160 ad 917: /*
918: * solock() provides atomicity of access. splsoftnet() prevents
919: * protocol processing soft interrupts from interrupting us and
920: * blocking (expensive).
921: */
922: s = splsoftnet();
923: solock(so);
1.54 lukem 924: atomic = sosendallatonce(so) || top;
1.1 cgd 925: if (uio)
926: resid = uio->uio_resid;
927: else
928: resid = top->m_pkthdr.len;
1.7 cgd 929: /*
930: * In theory resid should be unsigned.
931: * However, space must be signed, as it might be less than 0
932: * if we over-committed, and we must use a signed comparison
933: * of space and resid. On the other hand, a negative resid
934: * causes us to loop sending 0-length segments to the protocol.
935: */
1.29 mycroft 936: if (resid < 0) {
937: error = EINVAL;
938: goto out;
939: }
1.1 cgd 940: dontroute =
941: (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
942: (so->so_proto->pr_flags & PR_ATOMIC);
1.165 christos 943: l->l_ru.ru_msgsnd++;
1.1 cgd 944: if (control)
945: clen = control->m_len;
1.54 lukem 946: restart:
1.21 christos 947: if ((error = sblock(&so->so_snd, SBLOCKWAIT(flags))) != 0)
1.1 cgd 948: goto out;
949: do {
1.160 ad 950: if (so->so_state & SS_CANTSENDMORE) {
951: error = EPIPE;
952: goto release;
953: }
1.48 thorpej 954: if (so->so_error) {
955: error = so->so_error;
956: so->so_error = 0;
957: goto release;
958: }
1.1 cgd 959: if ((so->so_state & SS_ISCONNECTED) == 0) {
960: if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
961: if ((so->so_state & SS_ISCONFIRMING) == 0 &&
1.160 ad 962: !(resid == 0 && clen != 0)) {
963: error = ENOTCONN;
964: goto release;
965: }
966: } else if (addr == 0) {
967: error = EDESTADDRREQ;
968: goto release;
969: }
1.1 cgd 970: }
971: space = sbspace(&so->so_snd);
972: if (flags & MSG_OOB)
973: space += 1024;
1.21 christos 974: if ((atomic && resid > so->so_snd.sb_hiwat) ||
1.160 ad 975: clen > so->so_snd.sb_hiwat) {
976: error = EMSGSIZE;
977: goto release;
978: }
1.96 mycroft 979: if (space < resid + clen &&
1.1 cgd 980: (atomic || space < so->so_snd.sb_lowat || space < clen)) {
1.160 ad 981: if (so->so_nbio) {
982: error = EWOULDBLOCK;
983: goto release;
984: }
1.1 cgd 985: sbunlock(&so->so_snd);
1.196 dsl 986: if (wakeup_state & SS_RESTARTSYS) {
987: error = ERESTART;
988: goto out;
989: }
1.1 cgd 990: error = sbwait(&so->so_snd);
991: if (error)
992: goto out;
1.196 dsl 993: wakeup_state = so->so_state;
1.1 cgd 994: goto restart;
995: }
1.196 dsl 996: wakeup_state = 0;
1.1 cgd 997: mp = ⊤
998: space -= clen;
999: do {
1.45 tv 1000: if (uio == NULL) {
1001: /*
1002: * Data is prepackaged in "top".
1003: */
1004: resid = 0;
1005: if (flags & MSG_EOR)
1006: top->m_flags |= M_EOR;
1007: } else do {
1.160 ad 1008: sounlock(so);
1009: splx(s);
1.144 dyoung 1010: if (top == NULL) {
1.78 matt 1011: m = m_gethdr(M_WAIT, MT_DATA);
1.45 tv 1012: mlen = MHLEN;
1013: m->m_pkthdr.len = 0;
1.140 dyoung 1014: m->m_pkthdr.rcvif = NULL;
1.45 tv 1015: } else {
1.78 matt 1016: m = m_get(M_WAIT, MT_DATA);
1.45 tv 1017: mlen = MLEN;
1018: }
1.78 matt 1019: MCLAIM(m, so->so_snd.sb_mowner);
1.121 yamt 1020: if (sock_loan_thresh >= 0 &&
1021: uio->uio_iov->iov_len >= sock_loan_thresh &&
1022: space >= sock_loan_thresh &&
1.64 thorpej 1023: (len = sosend_loan(so, uio, m,
1024: space)) != 0) {
1025: SOSEND_COUNTER_INCR(&sosend_loan_big);
1026: space -= len;
1027: goto have_data;
1028: }
1.45 tv 1029: if (resid >= MINCLSIZE && space >= MCLBYTES) {
1.64 thorpej 1030: SOSEND_COUNTER_INCR(&sosend_copy_big);
1.201 oki 1031: m_clget(m, M_DONTWAIT);
1.45 tv 1032: if ((m->m_flags & M_EXT) == 0)
1033: goto nopages;
1034: mlen = MCLBYTES;
1035: if (atomic && top == 0) {
1.58 jdolecek 1036: len = lmin(MCLBYTES - max_hdr,
1.54 lukem 1037: resid);
1.45 tv 1038: m->m_data += max_hdr;
1039: } else
1.58 jdolecek 1040: len = lmin(MCLBYTES, resid);
1.45 tv 1041: space -= len;
1042: } else {
1.64 thorpej 1043: nopages:
1044: SOSEND_COUNTER_INCR(&sosend_copy_small);
1.58 jdolecek 1045: len = lmin(lmin(mlen, resid), space);
1.45 tv 1046: space -= len;
1047: /*
1048: * For datagram protocols, leave room
1049: * for protocol headers in first mbuf.
1050: */
1051: if (atomic && top == 0 && len < mlen)
1052: MH_ALIGN(m, len);
1053: }
1.144 dyoung 1054: error = uiomove(mtod(m, void *), (int)len, uio);
1.64 thorpej 1055: have_data:
1.45 tv 1056: resid = uio->uio_resid;
1057: m->m_len = len;
1058: *mp = m;
1059: top->m_pkthdr.len += len;
1.160 ad 1060: s = splsoftnet();
1061: solock(so);
1.144 dyoung 1062: if (error != 0)
1.45 tv 1063: goto release;
1064: mp = &m->m_next;
1065: if (resid <= 0) {
1066: if (flags & MSG_EOR)
1067: top->m_flags |= M_EOR;
1068: break;
1069: }
1070: } while (space > 0 && atomic);
1.108 perry 1071:
1.160 ad 1072: if (so->so_state & SS_CANTSENDMORE) {
1073: error = EPIPE;
1074: goto release;
1075: }
1.45 tv 1076: if (dontroute)
1077: so->so_options |= SO_DONTROUTE;
1078: if (resid > 0)
1079: so->so_state |= SS_MORETOCOME;
1.46 sommerfe 1080: error = (*so->so_proto->pr_usrreq)(so,
1081: (flags & MSG_OOB) ? PRU_SENDOOB : PRU_SEND,
1.160 ad 1082: top, addr, control, curlwp);
1.45 tv 1083: if (dontroute)
1084: so->so_options &= ~SO_DONTROUTE;
1085: if (resid > 0)
1086: so->so_state &= ~SS_MORETOCOME;
1087: clen = 0;
1.144 dyoung 1088: control = NULL;
1089: top = NULL;
1.45 tv 1090: mp = ⊤
1.144 dyoung 1091: if (error != 0)
1.1 cgd 1092: goto release;
1093: } while (resid && space > 0);
1094: } while (resid);
1095:
1.54 lukem 1096: release:
1.1 cgd 1097: sbunlock(&so->so_snd);
1.54 lukem 1098: out:
1.160 ad 1099: sounlock(so);
1100: splx(s);
1.1 cgd 1101: if (top)
1102: m_freem(top);
1103: if (control)
1104: m_freem(control);
1105: return (error);
1106: }
1107:
1108: /*
1.159 ad 1109: * Following replacement or removal of the first mbuf on the first
1110: * mbuf chain of a socket buffer, push necessary state changes back
1111: * into the socket buffer so that other consumers see the values
1112: * consistently. 'nextrecord' is the callers locally stored value of
1113: * the original value of sb->sb_mb->m_nextpkt which must be restored
1114: * when the lead mbuf changes. NOTE: 'nextrecord' may be NULL.
1115: */
1116: static void
1117: sbsync(struct sockbuf *sb, struct mbuf *nextrecord)
1118: {
1119:
1.160 ad 1120: KASSERT(solocked(sb->sb_so));
1121:
1.159 ad 1122: /*
1123: * First, update for the new value of nextrecord. If necessary,
1124: * make it the first record.
1125: */
1126: if (sb->sb_mb != NULL)
1127: sb->sb_mb->m_nextpkt = nextrecord;
1128: else
1129: sb->sb_mb = nextrecord;
1130:
1131: /*
1132: * Now update any dependent socket buffer fields to reflect
1133: * the new state. This is an inline of SB_EMPTY_FIXUP, with
1134: * the addition of a second clause that takes care of the
1135: * case where sb_mb has been updated, but remains the last
1136: * record.
1137: */
1138: if (sb->sb_mb == NULL) {
1139: sb->sb_mbtail = NULL;
1140: sb->sb_lastrecord = NULL;
1141: } else if (sb->sb_mb->m_nextpkt == NULL)
1142: sb->sb_lastrecord = sb->sb_mb;
1143: }
1144:
1145: /*
1.1 cgd 1146: * Implement receive operations on a socket.
1147: * We depend on the way that records are added to the sockbuf
1148: * by sbappend*. In particular, each record (mbufs linked through m_next)
1149: * must begin with an address if the protocol so specifies,
1150: * followed by an optional mbuf or mbufs containing ancillary data,
1151: * and then zero or more mbufs of data.
1152: * In order to avoid blocking network interrupts for the entire time here,
1153: * we splx() while doing the actual copy to user space.
1154: * Although the sockbuf is locked, new data may still be appended,
1155: * and thus we must maintain consistency of the sockbuf during that time.
1156: *
1157: * The caller may receive the data as a single mbuf chain by supplying
1158: * an mbuf **mp0 for use in returning the chain. The uio is then used
1159: * only for the count in uio_resid.
1160: */
1.3 andrew 1161: int
1.54 lukem 1162: soreceive(struct socket *so, struct mbuf **paddr, struct uio *uio,
1163: struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
1.1 cgd 1164: {
1.116 yamt 1165: struct lwp *l = curlwp;
1.160 ad 1166: struct mbuf *m, **mp, *mt;
1.146 dyoung 1167: int atomic, flags, len, error, s, offset, moff, type, orig_resid;
1.99 matt 1168: const struct protosw *pr;
1.54 lukem 1169: struct mbuf *nextrecord;
1.67 he 1170: int mbuf_removed = 0;
1.146 dyoung 1171: const struct domain *dom;
1.196 dsl 1172: short wakeup_state = 0;
1.64 thorpej 1173:
1.54 lukem 1174: pr = so->so_proto;
1.146 dyoung 1175: atomic = pr->pr_flags & PR_ATOMIC;
1176: dom = pr->pr_domain;
1.1 cgd 1177: mp = mp0;
1.54 lukem 1178: type = 0;
1179: orig_resid = uio->uio_resid;
1.102 jonathan 1180:
1.144 dyoung 1181: if (paddr != NULL)
1182: *paddr = NULL;
1183: if (controlp != NULL)
1184: *controlp = NULL;
1185: if (flagsp != NULL)
1.1 cgd 1186: flags = *flagsp &~ MSG_EOR;
1187: else
1188: flags = 0;
1.66 enami 1189:
1190: if ((flags & MSG_DONTWAIT) == 0)
1.117 yamt 1191: sodopendfree();
1.66 enami 1192:
1.1 cgd 1193: if (flags & MSG_OOB) {
1194: m = m_get(M_WAIT, MT_DATA);
1.160 ad 1195: solock(so);
1.17 cgd 1196: error = (*pr->pr_usrreq)(so, PRU_RCVOOB, m,
1.140 dyoung 1197: (struct mbuf *)(long)(flags & MSG_PEEK), NULL, l);
1.160 ad 1198: sounlock(so);
1.1 cgd 1199: if (error)
1200: goto bad;
1201: do {
1.134 christos 1202: error = uiomove(mtod(m, void *),
1.1 cgd 1203: (int) min(uio->uio_resid, m->m_len), uio);
1204: m = m_free(m);
1.144 dyoung 1205: } while (uio->uio_resid > 0 && error == 0 && m);
1.54 lukem 1206: bad:
1.144 dyoung 1207: if (m != NULL)
1.1 cgd 1208: m_freem(m);
1.144 dyoung 1209: return error;
1.1 cgd 1210: }
1.144 dyoung 1211: if (mp != NULL)
1.140 dyoung 1212: *mp = NULL;
1.160 ad 1213:
1214: /*
1215: * solock() provides atomicity of access. splsoftnet() prevents
1216: * protocol processing soft interrupts from interrupting us and
1217: * blocking (expensive).
1218: */
1219: s = splsoftnet();
1220: solock(so);
1.1 cgd 1221: if (so->so_state & SS_ISCONFIRMING && uio->uio_resid)
1.140 dyoung 1222: (*pr->pr_usrreq)(so, PRU_RCVD, NULL, NULL, NULL, l);
1.1 cgd 1223:
1.54 lukem 1224: restart:
1.160 ad 1225: if ((error = sblock(&so->so_rcv, SBLOCKWAIT(flags))) != 0) {
1226: sounlock(so);
1227: splx(s);
1.144 dyoung 1228: return error;
1.160 ad 1229: }
1.1 cgd 1230:
1231: m = so->so_rcv.sb_mb;
1232: /*
1233: * If we have less data than requested, block awaiting more
1234: * (subject to any timeout) if:
1.15 mycroft 1235: * 1. the current count is less than the low water mark,
1.1 cgd 1236: * 2. MSG_WAITALL is set, and it is possible to do the entire
1.15 mycroft 1237: * receive operation at once if we block (resid <= hiwat), or
1238: * 3. MSG_DONTWAIT is not set.
1.1 cgd 1239: * If MSG_WAITALL is set but resid is larger than the receive buffer,
1240: * we have to do the receive in sections, and thus risk returning
1241: * a short count if a timeout or signal occurs after we start.
1242: */
1.144 dyoung 1243: if (m == NULL ||
1244: ((flags & MSG_DONTWAIT) == 0 &&
1245: so->so_rcv.sb_cc < uio->uio_resid &&
1246: (so->so_rcv.sb_cc < so->so_rcv.sb_lowat ||
1247: ((flags & MSG_WAITALL) &&
1248: uio->uio_resid <= so->so_rcv.sb_hiwat)) &&
1.146 dyoung 1249: m->m_nextpkt == NULL && !atomic)) {
1.1 cgd 1250: #ifdef DIAGNOSTIC
1.144 dyoung 1251: if (m == NULL && so->so_rcv.sb_cc)
1.1 cgd 1252: panic("receive 1");
1253: #endif
1254: if (so->so_error) {
1.144 dyoung 1255: if (m != NULL)
1.15 mycroft 1256: goto dontblock;
1.1 cgd 1257: error = so->so_error;
1258: if ((flags & MSG_PEEK) == 0)
1259: so->so_error = 0;
1260: goto release;
1261: }
1262: if (so->so_state & SS_CANTRCVMORE) {
1.144 dyoung 1263: if (m != NULL)
1.15 mycroft 1264: goto dontblock;
1.1 cgd 1265: else
1266: goto release;
1267: }
1.144 dyoung 1268: for (; m != NULL; m = m->m_next)
1.1 cgd 1269: if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) {
1270: m = so->so_rcv.sb_mb;
1271: goto dontblock;
1272: }
1273: if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
1274: (so->so_proto->pr_flags & PR_CONNREQUIRED)) {
1275: error = ENOTCONN;
1276: goto release;
1277: }
1278: if (uio->uio_resid == 0)
1279: goto release;
1.151 ad 1280: if (so->so_nbio || (flags & MSG_DONTWAIT)) {
1.1 cgd 1281: error = EWOULDBLOCK;
1282: goto release;
1283: }
1.69 thorpej 1284: SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 1");
1285: SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 1");
1.1 cgd 1286: sbunlock(&so->so_rcv);
1.196 dsl 1287: if (wakeup_state & SS_RESTARTSYS)
1288: error = ERESTART;
1289: else
1290: error = sbwait(&so->so_rcv);
1.160 ad 1291: if (error != 0) {
1292: sounlock(so);
1293: splx(s);
1.144 dyoung 1294: return error;
1.160 ad 1295: }
1.196 dsl 1296: wakeup_state = so->so_state;
1.1 cgd 1297: goto restart;
1298: }
1.54 lukem 1299: dontblock:
1.69 thorpej 1300: /*
1301: * On entry here, m points to the first record of the socket buffer.
1.159 ad 1302: * From this point onward, we maintain 'nextrecord' as a cache of the
1303: * pointer to the next record in the socket buffer. We must keep the
1304: * various socket buffer pointers and local stack versions of the
1305: * pointers in sync, pushing out modifications before dropping the
1.160 ad 1306: * socket lock, and re-reading them when picking it up.
1.159 ad 1307: *
1308: * Otherwise, we will race with the network stack appending new data
1309: * or records onto the socket buffer by using inconsistent/stale
1310: * versions of the field, possibly resulting in socket buffer
1311: * corruption.
1312: *
1313: * By holding the high-level sblock(), we prevent simultaneous
1314: * readers from pulling off the front of the socket buffer.
1.69 thorpej 1315: */
1.144 dyoung 1316: if (l != NULL)
1.157 ad 1317: l->l_ru.ru_msgrcv++;
1.69 thorpej 1318: KASSERT(m == so->so_rcv.sb_mb);
1319: SBLASTRECORDCHK(&so->so_rcv, "soreceive 1");
1320: SBLASTMBUFCHK(&so->so_rcv, "soreceive 1");
1.1 cgd 1321: nextrecord = m->m_nextpkt;
1322: if (pr->pr_flags & PR_ADDR) {
1323: #ifdef DIAGNOSTIC
1324: if (m->m_type != MT_SONAME)
1325: panic("receive 1a");
1326: #endif
1.3 andrew 1327: orig_resid = 0;
1.1 cgd 1328: if (flags & MSG_PEEK) {
1329: if (paddr)
1330: *paddr = m_copy(m, 0, m->m_len);
1331: m = m->m_next;
1332: } else {
1333: sbfree(&so->so_rcv, m);
1.67 he 1334: mbuf_removed = 1;
1.144 dyoung 1335: if (paddr != NULL) {
1.1 cgd 1336: *paddr = m;
1337: so->so_rcv.sb_mb = m->m_next;
1.144 dyoung 1338: m->m_next = NULL;
1.1 cgd 1339: m = so->so_rcv.sb_mb;
1340: } else {
1341: MFREE(m, so->so_rcv.sb_mb);
1342: m = so->so_rcv.sb_mb;
1343: }
1.159 ad 1344: sbsync(&so->so_rcv, nextrecord);
1.1 cgd 1345: }
1346: }
1.159 ad 1347:
1348: /*
1349: * Process one or more MT_CONTROL mbufs present before any data mbufs
1350: * in the first mbuf chain on the socket buffer. If MSG_PEEK, we
1351: * just copy the data; if !MSG_PEEK, we call into the protocol to
1352: * perform externalization (or freeing if controlp == NULL).
1353: */
1354: if (__predict_false(m != NULL && m->m_type == MT_CONTROL)) {
1355: struct mbuf *cm = NULL, *cmn;
1356: struct mbuf **cme = &cm;
1357:
1358: do {
1359: if (flags & MSG_PEEK) {
1360: if (controlp != NULL) {
1361: *controlp = m_copy(m, 0, m->m_len);
1362: controlp = &(*controlp)->m_next;
1363: }
1364: m = m->m_next;
1365: } else {
1366: sbfree(&so->so_rcv, m);
1.1 cgd 1367: so->so_rcv.sb_mb = m->m_next;
1.144 dyoung 1368: m->m_next = NULL;
1.159 ad 1369: *cme = m;
1370: cme = &(*cme)->m_next;
1.1 cgd 1371: m = so->so_rcv.sb_mb;
1.159 ad 1372: }
1373: } while (m != NULL && m->m_type == MT_CONTROL);
1374: if ((flags & MSG_PEEK) == 0)
1375: sbsync(&so->so_rcv, nextrecord);
1376: for (; cm != NULL; cm = cmn) {
1377: cmn = cm->m_next;
1378: cm->m_next = NULL;
1379: type = mtod(cm, struct cmsghdr *)->cmsg_type;
1380: if (controlp != NULL) {
1381: if (dom->dom_externalize != NULL &&
1382: type == SCM_RIGHTS) {
1.160 ad 1383: sounlock(so);
1.159 ad 1384: splx(s);
1.204 ! christos 1385: error = (*dom->dom_externalize)(cm, l,
! 1386: (flags & MSG_CMSG_CLOEXEC) ?
! 1387: O_CLOEXEC : 0);
1.159 ad 1388: s = splsoftnet();
1.160 ad 1389: solock(so);
1.159 ad 1390: }
1391: *controlp = cm;
1392: while (*controlp != NULL)
1393: controlp = &(*controlp)->m_next;
1.1 cgd 1394: } else {
1.106 itojun 1395: /*
1396: * Dispose of any SCM_RIGHTS message that went
1397: * through the read path rather than recv.
1398: */
1.159 ad 1399: if (dom->dom_dispose != NULL &&
1400: type == SCM_RIGHTS) {
1.160 ad 1401: sounlock(so);
1.159 ad 1402: (*dom->dom_dispose)(cm);
1.160 ad 1403: solock(so);
1.159 ad 1404: }
1405: m_freem(cm);
1.1 cgd 1406: }
1407: }
1.159 ad 1408: if (m != NULL)
1409: nextrecord = so->so_rcv.sb_mb->m_nextpkt;
1410: else
1411: nextrecord = so->so_rcv.sb_mb;
1412: orig_resid = 0;
1.1 cgd 1413: }
1.69 thorpej 1414:
1.159 ad 1415: /* If m is non-NULL, we have some data to read. */
1416: if (__predict_true(m != NULL)) {
1.1 cgd 1417: type = m->m_type;
1418: if (type == MT_OOBDATA)
1419: flags |= MSG_OOB;
1420: }
1.69 thorpej 1421: SBLASTRECORDCHK(&so->so_rcv, "soreceive 2");
1422: SBLASTMBUFCHK(&so->so_rcv, "soreceive 2");
1423:
1.1 cgd 1424: moff = 0;
1425: offset = 0;
1.144 dyoung 1426: while (m != NULL && uio->uio_resid > 0 && error == 0) {
1.1 cgd 1427: if (m->m_type == MT_OOBDATA) {
1428: if (type != MT_OOBDATA)
1429: break;
1430: } else if (type == MT_OOBDATA)
1431: break;
1432: #ifdef DIAGNOSTIC
1433: else if (m->m_type != MT_DATA && m->m_type != MT_HEADER)
1434: panic("receive 3");
1435: #endif
1436: so->so_state &= ~SS_RCVATMARK;
1.196 dsl 1437: wakeup_state = 0;
1.1 cgd 1438: len = uio->uio_resid;
1439: if (so->so_oobmark && len > so->so_oobmark - offset)
1440: len = so->so_oobmark - offset;
1441: if (len > m->m_len - moff)
1442: len = m->m_len - moff;
1443: /*
1444: * If mp is set, just pass back the mbufs.
1445: * Otherwise copy them out via the uio, then free.
1446: * Sockbuf must be consistent here (points to current mbuf,
1447: * it points to next record) when we drop priority;
1448: * we must note any additions to the sockbuf when we
1449: * block interrupts again.
1450: */
1.144 dyoung 1451: if (mp == NULL) {
1.69 thorpej 1452: SBLASTRECORDCHK(&so->so_rcv, "soreceive uiomove");
1453: SBLASTMBUFCHK(&so->so_rcv, "soreceive uiomove");
1.160 ad 1454: sounlock(so);
1.1 cgd 1455: splx(s);
1.134 christos 1456: error = uiomove(mtod(m, char *) + moff, (int)len, uio);
1.20 mycroft 1457: s = splsoftnet();
1.160 ad 1458: solock(so);
1.144 dyoung 1459: if (error != 0) {
1.67 he 1460: /*
1461: * If any part of the record has been removed
1462: * (such as the MT_SONAME mbuf, which will
1463: * happen when PR_ADDR, and thus also
1464: * PR_ATOMIC, is set), then drop the entire
1465: * record to maintain the atomicity of the
1466: * receive operation.
1467: *
1468: * This avoids a later panic("receive 1a")
1469: * when compiled with DIAGNOSTIC.
1470: */
1.146 dyoung 1471: if (m && mbuf_removed && atomic)
1.67 he 1472: (void) sbdroprecord(&so->so_rcv);
1473:
1.57 jdolecek 1474: goto release;
1.67 he 1475: }
1.1 cgd 1476: } else
1477: uio->uio_resid -= len;
1478: if (len == m->m_len - moff) {
1479: if (m->m_flags & M_EOR)
1480: flags |= MSG_EOR;
1481: if (flags & MSG_PEEK) {
1482: m = m->m_next;
1483: moff = 0;
1484: } else {
1485: nextrecord = m->m_nextpkt;
1486: sbfree(&so->so_rcv, m);
1487: if (mp) {
1488: *mp = m;
1489: mp = &m->m_next;
1490: so->so_rcv.sb_mb = m = m->m_next;
1.140 dyoung 1491: *mp = NULL;
1.1 cgd 1492: } else {
1493: MFREE(m, so->so_rcv.sb_mb);
1494: m = so->so_rcv.sb_mb;
1495: }
1.69 thorpej 1496: /*
1497: * If m != NULL, we also know that
1498: * so->so_rcv.sb_mb != NULL.
1499: */
1500: KASSERT(so->so_rcv.sb_mb == m);
1501: if (m) {
1.1 cgd 1502: m->m_nextpkt = nextrecord;
1.69 thorpej 1503: if (nextrecord == NULL)
1504: so->so_rcv.sb_lastrecord = m;
1505: } else {
1506: so->so_rcv.sb_mb = nextrecord;
1.70 thorpej 1507: SB_EMPTY_FIXUP(&so->so_rcv);
1.69 thorpej 1508: }
1509: SBLASTRECORDCHK(&so->so_rcv, "soreceive 3");
1510: SBLASTMBUFCHK(&so->so_rcv, "soreceive 3");
1.1 cgd 1511: }
1.144 dyoung 1512: } else if (flags & MSG_PEEK)
1513: moff += len;
1514: else {
1.160 ad 1515: if (mp != NULL) {
1516: mt = m_copym(m, 0, len, M_NOWAIT);
1517: if (__predict_false(mt == NULL)) {
1518: sounlock(so);
1519: mt = m_copym(m, 0, len, M_WAIT);
1520: solock(so);
1521: }
1522: *mp = mt;
1523: }
1.144 dyoung 1524: m->m_data += len;
1525: m->m_len -= len;
1526: so->so_rcv.sb_cc -= len;
1.1 cgd 1527: }
1528: if (so->so_oobmark) {
1529: if ((flags & MSG_PEEK) == 0) {
1530: so->so_oobmark -= len;
1531: if (so->so_oobmark == 0) {
1532: so->so_state |= SS_RCVATMARK;
1533: break;
1534: }
1.7 cgd 1535: } else {
1.1 cgd 1536: offset += len;
1.7 cgd 1537: if (offset == so->so_oobmark)
1538: break;
1539: }
1.1 cgd 1540: }
1541: if (flags & MSG_EOR)
1542: break;
1543: /*
1544: * If the MSG_WAITALL flag is set (for non-atomic socket),
1545: * we must not quit until "uio->uio_resid == 0" or an error
1546: * termination. If a signal/timeout occurs, return
1547: * with a short count but without error.
1548: * Keep sockbuf locked against other readers.
1549: */
1.144 dyoung 1550: while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 &&
1.3 andrew 1551: !sosendallatonce(so) && !nextrecord) {
1.1 cgd 1552: if (so->so_error || so->so_state & SS_CANTRCVMORE)
1553: break;
1.68 matt 1554: /*
1555: * If we are peeking and the socket receive buffer is
1556: * full, stop since we can't get more data to peek at.
1557: */
1558: if ((flags & MSG_PEEK) && sbspace(&so->so_rcv) <= 0)
1559: break;
1560: /*
1561: * If we've drained the socket buffer, tell the
1562: * protocol in case it needs to do something to
1563: * get it filled again.
1564: */
1565: if ((pr->pr_flags & PR_WANTRCVD) && so->so_pcb)
1566: (*pr->pr_usrreq)(so, PRU_RCVD,
1.140 dyoung 1567: NULL, (struct mbuf *)(long)flags, NULL, l);
1.69 thorpej 1568: SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 2");
1569: SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 2");
1.196 dsl 1570: if (wakeup_state & SS_RESTARTSYS)
1571: error = ERESTART;
1572: else
1573: error = sbwait(&so->so_rcv);
1.144 dyoung 1574: if (error != 0) {
1.1 cgd 1575: sbunlock(&so->so_rcv);
1.160 ad 1576: sounlock(so);
1.1 cgd 1577: splx(s);
1.144 dyoung 1578: return 0;
1.1 cgd 1579: }
1.21 christos 1580: if ((m = so->so_rcv.sb_mb) != NULL)
1.1 cgd 1581: nextrecord = m->m_nextpkt;
1.196 dsl 1582: wakeup_state = so->so_state;
1.1 cgd 1583: }
1584: }
1.3 andrew 1585:
1.146 dyoung 1586: if (m && atomic) {
1.3 andrew 1587: flags |= MSG_TRUNC;
1588: if ((flags & MSG_PEEK) == 0)
1589: (void) sbdroprecord(&so->so_rcv);
1590: }
1.1 cgd 1591: if ((flags & MSG_PEEK) == 0) {
1.144 dyoung 1592: if (m == NULL) {
1.69 thorpej 1593: /*
1.70 thorpej 1594: * First part is an inline SB_EMPTY_FIXUP(). Second
1.69 thorpej 1595: * part makes sure sb_lastrecord is up-to-date if
1596: * there is still data in the socket buffer.
1597: */
1.1 cgd 1598: so->so_rcv.sb_mb = nextrecord;
1.69 thorpej 1599: if (so->so_rcv.sb_mb == NULL) {
1600: so->so_rcv.sb_mbtail = NULL;
1601: so->so_rcv.sb_lastrecord = NULL;
1602: } else if (nextrecord->m_nextpkt == NULL)
1603: so->so_rcv.sb_lastrecord = nextrecord;
1604: }
1605: SBLASTRECORDCHK(&so->so_rcv, "soreceive 4");
1606: SBLASTMBUFCHK(&so->so_rcv, "soreceive 4");
1.1 cgd 1607: if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
1.140 dyoung 1608: (*pr->pr_usrreq)(so, PRU_RCVD, NULL,
1609: (struct mbuf *)(long)flags, NULL, l);
1.1 cgd 1610: }
1.3 andrew 1611: if (orig_resid == uio->uio_resid && orig_resid &&
1612: (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) {
1613: sbunlock(&so->so_rcv);
1614: goto restart;
1615: }
1.108 perry 1616:
1.144 dyoung 1617: if (flagsp != NULL)
1.1 cgd 1618: *flagsp |= flags;
1.54 lukem 1619: release:
1.1 cgd 1620: sbunlock(&so->so_rcv);
1.160 ad 1621: sounlock(so);
1.1 cgd 1622: splx(s);
1.144 dyoung 1623: return error;
1.1 cgd 1624: }
1625:
1.14 mycroft 1626: int
1.54 lukem 1627: soshutdown(struct socket *so, int how)
1.1 cgd 1628: {
1.99 matt 1629: const struct protosw *pr;
1.160 ad 1630: int error;
1631:
1632: KASSERT(solocked(so));
1.34 kleink 1633:
1.54 lukem 1634: pr = so->so_proto;
1.34 kleink 1635: if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR))
1636: return (EINVAL);
1.1 cgd 1637:
1.160 ad 1638: if (how == SHUT_RD || how == SHUT_RDWR) {
1.1 cgd 1639: sorflush(so);
1.160 ad 1640: error = 0;
1641: }
1.34 kleink 1642: if (how == SHUT_WR || how == SHUT_RDWR)
1.160 ad 1643: error = (*pr->pr_usrreq)(so, PRU_SHUTDOWN, NULL,
1.140 dyoung 1644: NULL, NULL, NULL);
1.160 ad 1645:
1646: return error;
1.1 cgd 1647: }
1648:
1.195 dsl 1649: void
1.196 dsl 1650: sorestart(struct socket *so)
1.188 ad 1651: {
1.196 dsl 1652: /*
1653: * An application has called close() on an fd on which another
1654: * of its threads has called a socket system call.
1655: * Mark this and wake everyone up, and code that would block again
1656: * instead returns ERESTART.
1657: * On system call re-entry the fd is validated and EBADF returned.
1658: * Any other fd will block again on the 2nd syscall.
1659: */
1.188 ad 1660: solock(so);
1.196 dsl 1661: so->so_state |= SS_RESTARTSYS;
1.188 ad 1662: cv_broadcast(&so->so_cv);
1.196 dsl 1663: cv_broadcast(&so->so_snd.sb_cv);
1664: cv_broadcast(&so->so_rcv.sb_cv);
1.188 ad 1665: sounlock(so);
1666: }
1667:
1.14 mycroft 1668: void
1.54 lukem 1669: sorflush(struct socket *so)
1.1 cgd 1670: {
1.54 lukem 1671: struct sockbuf *sb, asb;
1.99 matt 1672: const struct protosw *pr;
1.160 ad 1673:
1674: KASSERT(solocked(so));
1.1 cgd 1675:
1.54 lukem 1676: sb = &so->so_rcv;
1677: pr = so->so_proto;
1.160 ad 1678: socantrcvmore(so);
1.1 cgd 1679: sb->sb_flags |= SB_NOINTR;
1.160 ad 1680: (void )sblock(sb, M_WAITOK);
1.1 cgd 1681: sbunlock(sb);
1682: asb = *sb;
1.86 wrstuden 1683: /*
1684: * Clear most of the sockbuf structure, but leave some of the
1685: * fields valid.
1686: */
1687: memset(&sb->sb_startzero, 0,
1688: sizeof(*sb) - offsetof(struct sockbuf, sb_startzero));
1.160 ad 1689: if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose) {
1690: sounlock(so);
1.1 cgd 1691: (*pr->pr_domain->dom_dispose)(asb.sb_mb);
1.160 ad 1692: solock(so);
1693: }
1.98 christos 1694: sbrelease(&asb, so);
1.1 cgd 1695: }
1696:
1.171 plunky 1697: /*
1698: * internal set SOL_SOCKET options
1699: */
1.142 dyoung 1700: static int
1.171 plunky 1701: sosetopt1(struct socket *so, const struct sockopt *sopt)
1.1 cgd 1702: {
1.182 christos 1703: int error = EINVAL, optval, opt;
1.171 plunky 1704: struct linger l;
1705: struct timeval tv;
1.142 dyoung 1706:
1.179 christos 1707: switch ((opt = sopt->sopt_name)) {
1.142 dyoung 1708:
1.170 tls 1709: case SO_ACCEPTFILTER:
1.177 ad 1710: error = accept_filt_setopt(so, sopt);
1711: KASSERT(solocked(so));
1.170 tls 1712: break;
1713:
1.171 plunky 1714: case SO_LINGER:
1715: error = sockopt_get(sopt, &l, sizeof(l));
1.177 ad 1716: solock(so);
1.171 plunky 1717: if (error)
1.177 ad 1718: break;
1.171 plunky 1719: if (l.l_linger < 0 || l.l_linger > USHRT_MAX ||
1.177 ad 1720: l.l_linger > (INT_MAX / hz)) {
1721: error = EDOM;
1722: break;
1723: }
1.171 plunky 1724: so->so_linger = l.l_linger;
1725: if (l.l_onoff)
1726: so->so_options |= SO_LINGER;
1727: else
1728: so->so_options &= ~SO_LINGER;
1.177 ad 1729: break;
1.1 cgd 1730:
1.142 dyoung 1731: case SO_DEBUG:
1732: case SO_KEEPALIVE:
1733: case SO_DONTROUTE:
1734: case SO_USELOOPBACK:
1735: case SO_BROADCAST:
1736: case SO_REUSEADDR:
1737: case SO_REUSEPORT:
1738: case SO_OOBINLINE:
1739: case SO_TIMESTAMP:
1.184 christos 1740: #ifdef SO_OTIMESTAMP
1741: case SO_OTIMESTAMP:
1742: #endif
1.171 plunky 1743: error = sockopt_getint(sopt, &optval);
1.177 ad 1744: solock(so);
1.171 plunky 1745: if (error)
1.177 ad 1746: break;
1.171 plunky 1747: if (optval)
1.179 christos 1748: so->so_options |= opt;
1.142 dyoung 1749: else
1.179 christos 1750: so->so_options &= ~opt;
1.142 dyoung 1751: break;
1752:
1753: case SO_SNDBUF:
1754: case SO_RCVBUF:
1755: case SO_SNDLOWAT:
1756: case SO_RCVLOWAT:
1.171 plunky 1757: error = sockopt_getint(sopt, &optval);
1.177 ad 1758: solock(so);
1.171 plunky 1759: if (error)
1.177 ad 1760: break;
1.1 cgd 1761:
1.142 dyoung 1762: /*
1763: * Values < 1 make no sense for any of these
1764: * options, so disallow them.
1765: */
1.177 ad 1766: if (optval < 1) {
1767: error = EINVAL;
1768: break;
1769: }
1.1 cgd 1770:
1.179 christos 1771: switch (opt) {
1.171 plunky 1772: case SO_SNDBUF:
1.177 ad 1773: if (sbreserve(&so->so_snd, (u_long)optval, so) == 0) {
1774: error = ENOBUFS;
1775: break;
1776: }
1.171 plunky 1777: so->so_snd.sb_flags &= ~SB_AUTOSIZE;
1778: break;
1.1 cgd 1779:
1780: case SO_RCVBUF:
1.177 ad 1781: if (sbreserve(&so->so_rcv, (u_long)optval, so) == 0) {
1782: error = ENOBUFS;
1783: break;
1784: }
1.171 plunky 1785: so->so_rcv.sb_flags &= ~SB_AUTOSIZE;
1.142 dyoung 1786: break;
1787:
1788: /*
1789: * Make sure the low-water is never greater than
1790: * the high-water.
1791: */
1.1 cgd 1792: case SO_SNDLOWAT:
1.171 plunky 1793: if (optval > so->so_snd.sb_hiwat)
1794: optval = so->so_snd.sb_hiwat;
1795:
1796: so->so_snd.sb_lowat = optval;
1.142 dyoung 1797: break;
1.171 plunky 1798:
1.1 cgd 1799: case SO_RCVLOWAT:
1.171 plunky 1800: if (optval > so->so_rcv.sb_hiwat)
1801: optval = so->so_rcv.sb_hiwat;
1802:
1803: so->so_rcv.sb_lowat = optval;
1.142 dyoung 1804: break;
1805: }
1806: break;
1.28 thorpej 1807:
1.179 christos 1808: #ifdef COMPAT_50
1809: case SO_OSNDTIMEO:
1810: case SO_ORCVTIMEO: {
1811: struct timeval50 otv;
1812: error = sockopt_get(sopt, &otv, sizeof(otv));
1.186 pooka 1813: if (error) {
1814: solock(so);
1.183 christos 1815: break;
1.186 pooka 1816: }
1.179 christos 1817: timeval50_to_timeval(&otv, &tv);
1818: opt = opt == SO_OSNDTIMEO ? SO_SNDTIMEO : SO_RCVTIMEO;
1.182 christos 1819: error = 0;
1.179 christos 1820: /*FALLTHROUGH*/
1821: }
1822: #endif /* COMPAT_50 */
1823:
1.142 dyoung 1824: case SO_SNDTIMEO:
1825: case SO_RCVTIMEO:
1.182 christos 1826: if (error)
1.179 christos 1827: error = sockopt_get(sopt, &tv, sizeof(tv));
1.177 ad 1828: solock(so);
1.171 plunky 1829: if (error)
1.177 ad 1830: break;
1.171 plunky 1831:
1.177 ad 1832: if (tv.tv_sec > (INT_MAX - tv.tv_usec / tick) / hz) {
1833: error = EDOM;
1834: break;
1835: }
1.28 thorpej 1836:
1.171 plunky 1837: optval = tv.tv_sec * hz + tv.tv_usec / tick;
1838: if (optval == 0 && tv.tv_usec != 0)
1839: optval = 1;
1.28 thorpej 1840:
1.179 christos 1841: switch (opt) {
1.142 dyoung 1842: case SO_SNDTIMEO:
1.171 plunky 1843: so->so_snd.sb_timeo = optval;
1.1 cgd 1844: break;
1845: case SO_RCVTIMEO:
1.171 plunky 1846: so->so_rcv.sb_timeo = optval;
1.142 dyoung 1847: break;
1848: }
1849: break;
1.1 cgd 1850:
1.142 dyoung 1851: default:
1.177 ad 1852: solock(so);
1853: error = ENOPROTOOPT;
1854: break;
1.142 dyoung 1855: }
1.177 ad 1856: KASSERT(solocked(so));
1857: return error;
1.142 dyoung 1858: }
1.1 cgd 1859:
1.142 dyoung 1860: int
1.171 plunky 1861: sosetopt(struct socket *so, struct sockopt *sopt)
1.142 dyoung 1862: {
1863: int error, prerr;
1.1 cgd 1864:
1.177 ad 1865: if (sopt->sopt_level == SOL_SOCKET) {
1.171 plunky 1866: error = sosetopt1(so, sopt);
1.177 ad 1867: KASSERT(solocked(so));
1868: } else {
1.142 dyoung 1869: error = ENOPROTOOPT;
1.177 ad 1870: solock(so);
1871: }
1.1 cgd 1872:
1.142 dyoung 1873: if ((error == 0 || error == ENOPROTOOPT) &&
1874: so->so_proto != NULL && so->so_proto->pr_ctloutput != NULL) {
1875: /* give the protocol stack a shot */
1.171 plunky 1876: prerr = (*so->so_proto->pr_ctloutput)(PRCO_SETOPT, so, sopt);
1.142 dyoung 1877: if (prerr == 0)
1878: error = 0;
1879: else if (prerr != ENOPROTOOPT)
1880: error = prerr;
1.171 plunky 1881: }
1.160 ad 1882: sounlock(so);
1.142 dyoung 1883: return error;
1.1 cgd 1884: }
1885:
1.171 plunky 1886: /*
1887: * so_setsockopt() is a wrapper providing a sockopt structure for sosetopt()
1888: */
1889: int
1890: so_setsockopt(struct lwp *l, struct socket *so, int level, int name,
1891: const void *val, size_t valsize)
1892: {
1893: struct sockopt sopt;
1894: int error;
1895:
1896: KASSERT(valsize == 0 || val != NULL);
1897:
1898: sockopt_init(&sopt, level, name, valsize);
1899: sockopt_set(&sopt, val, valsize);
1900:
1901: error = sosetopt(so, &sopt);
1902:
1903: sockopt_destroy(&sopt);
1904:
1905: return error;
1906: }
1907:
1908: /*
1909: * internal get SOL_SOCKET options
1910: */
1911: static int
1912: sogetopt1(struct socket *so, struct sockopt *sopt)
1913: {
1.179 christos 1914: int error, optval, opt;
1.171 plunky 1915: struct linger l;
1916: struct timeval tv;
1917:
1.179 christos 1918: switch ((opt = sopt->sopt_name)) {
1.171 plunky 1919:
1920: case SO_ACCEPTFILTER:
1.177 ad 1921: error = accept_filt_getopt(so, sopt);
1.171 plunky 1922: break;
1923:
1924: case SO_LINGER:
1925: l.l_onoff = (so->so_options & SO_LINGER) ? 1 : 0;
1926: l.l_linger = so->so_linger;
1927:
1928: error = sockopt_set(sopt, &l, sizeof(l));
1929: break;
1930:
1931: case SO_USELOOPBACK:
1932: case SO_DONTROUTE:
1933: case SO_DEBUG:
1934: case SO_KEEPALIVE:
1935: case SO_REUSEADDR:
1936: case SO_REUSEPORT:
1937: case SO_BROADCAST:
1938: case SO_OOBINLINE:
1939: case SO_TIMESTAMP:
1.184 christos 1940: #ifdef SO_OTIMESTAMP
1941: case SO_OTIMESTAMP:
1942: #endif
1.179 christos 1943: error = sockopt_setint(sopt, (so->so_options & opt) ? 1 : 0);
1.171 plunky 1944: break;
1945:
1946: case SO_TYPE:
1947: error = sockopt_setint(sopt, so->so_type);
1948: break;
1949:
1950: case SO_ERROR:
1951: error = sockopt_setint(sopt, so->so_error);
1952: so->so_error = 0;
1953: break;
1954:
1955: case SO_SNDBUF:
1956: error = sockopt_setint(sopt, so->so_snd.sb_hiwat);
1957: break;
1958:
1959: case SO_RCVBUF:
1960: error = sockopt_setint(sopt, so->so_rcv.sb_hiwat);
1961: break;
1962:
1963: case SO_SNDLOWAT:
1964: error = sockopt_setint(sopt, so->so_snd.sb_lowat);
1965: break;
1966:
1967: case SO_RCVLOWAT:
1968: error = sockopt_setint(sopt, so->so_rcv.sb_lowat);
1969: break;
1970:
1.179 christos 1971: #ifdef COMPAT_50
1972: case SO_OSNDTIMEO:
1973: case SO_ORCVTIMEO: {
1974: struct timeval50 otv;
1975:
1976: optval = (opt == SO_OSNDTIMEO ?
1977: so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
1978:
1979: otv.tv_sec = optval / hz;
1980: otv.tv_usec = (optval % hz) * tick;
1981:
1982: error = sockopt_set(sopt, &otv, sizeof(otv));
1983: break;
1984: }
1985: #endif /* COMPAT_50 */
1986:
1.171 plunky 1987: case SO_SNDTIMEO:
1988: case SO_RCVTIMEO:
1.179 christos 1989: optval = (opt == SO_SNDTIMEO ?
1.171 plunky 1990: so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
1991:
1992: tv.tv_sec = optval / hz;
1993: tv.tv_usec = (optval % hz) * tick;
1994:
1995: error = sockopt_set(sopt, &tv, sizeof(tv));
1996: break;
1997:
1998: case SO_OVERFLOWED:
1999: error = sockopt_setint(sopt, so->so_rcv.sb_overflowed);
2000: break;
2001:
2002: default:
2003: error = ENOPROTOOPT;
2004: break;
2005: }
2006:
2007: return (error);
2008: }
2009:
1.14 mycroft 2010: int
1.171 plunky 2011: sogetopt(struct socket *so, struct sockopt *sopt)
1.1 cgd 2012: {
1.160 ad 2013: int error;
1.1 cgd 2014:
1.160 ad 2015: solock(so);
1.171 plunky 2016: if (sopt->sopt_level != SOL_SOCKET) {
1.1 cgd 2017: if (so->so_proto && so->so_proto->pr_ctloutput) {
1.160 ad 2018: error = ((*so->so_proto->pr_ctloutput)
1.171 plunky 2019: (PRCO_GETOPT, so, sopt));
1.1 cgd 2020: } else
1.160 ad 2021: error = (ENOPROTOOPT);
1.1 cgd 2022: } else {
1.171 plunky 2023: error = sogetopt1(so, sopt);
2024: }
2025: sounlock(so);
2026: return (error);
2027: }
2028:
2029: /*
2030: * alloc sockopt data buffer buffer
2031: * - will be released at destroy
2032: */
1.176 plunky 2033: static int
2034: sockopt_alloc(struct sockopt *sopt, size_t len, km_flag_t kmflag)
1.171 plunky 2035: {
2036:
2037: KASSERT(sopt->sopt_size == 0);
2038:
1.176 plunky 2039: if (len > sizeof(sopt->sopt_buf)) {
2040: sopt->sopt_data = kmem_zalloc(len, kmflag);
2041: if (sopt->sopt_data == NULL)
2042: return ENOMEM;
2043: } else
1.171 plunky 2044: sopt->sopt_data = sopt->sopt_buf;
2045:
2046: sopt->sopt_size = len;
1.176 plunky 2047: return 0;
1.171 plunky 2048: }
2049:
2050: /*
2051: * initialise sockopt storage
1.176 plunky 2052: * - MAY sleep during allocation
1.171 plunky 2053: */
2054: void
2055: sockopt_init(struct sockopt *sopt, int level, int name, size_t size)
2056: {
1.1 cgd 2057:
1.171 plunky 2058: memset(sopt, 0, sizeof(*sopt));
1.1 cgd 2059:
1.171 plunky 2060: sopt->sopt_level = level;
2061: sopt->sopt_name = name;
1.176 plunky 2062: (void)sockopt_alloc(sopt, size, KM_SLEEP);
1.171 plunky 2063: }
2064:
2065: /*
2066: * destroy sockopt storage
2067: * - will release any held memory references
2068: */
2069: void
2070: sockopt_destroy(struct sockopt *sopt)
2071: {
2072:
2073: if (sopt->sopt_data != sopt->sopt_buf)
1.173 plunky 2074: kmem_free(sopt->sopt_data, sopt->sopt_size);
1.171 plunky 2075:
2076: memset(sopt, 0, sizeof(*sopt));
2077: }
2078:
2079: /*
2080: * set sockopt value
2081: * - value is copied into sockopt
1.176 plunky 2082: * - memory is allocated when necessary, will not sleep
1.171 plunky 2083: */
2084: int
2085: sockopt_set(struct sockopt *sopt, const void *buf, size_t len)
2086: {
1.176 plunky 2087: int error;
1.171 plunky 2088:
1.176 plunky 2089: if (sopt->sopt_size == 0) {
2090: error = sockopt_alloc(sopt, len, KM_NOSLEEP);
2091: if (error)
2092: return error;
2093: }
1.171 plunky 2094:
2095: KASSERT(sopt->sopt_size == len);
2096: memcpy(sopt->sopt_data, buf, len);
2097: return 0;
2098: }
2099:
2100: /*
2101: * common case of set sockopt integer value
2102: */
2103: int
2104: sockopt_setint(struct sockopt *sopt, int val)
2105: {
2106:
2107: return sockopt_set(sopt, &val, sizeof(int));
2108: }
2109:
2110: /*
2111: * get sockopt value
2112: * - correct size must be given
2113: */
2114: int
2115: sockopt_get(const struct sockopt *sopt, void *buf, size_t len)
2116: {
1.170 tls 2117:
1.171 plunky 2118: if (sopt->sopt_size != len)
2119: return EINVAL;
1.1 cgd 2120:
1.171 plunky 2121: memcpy(buf, sopt->sopt_data, len);
2122: return 0;
2123: }
1.1 cgd 2124:
1.171 plunky 2125: /*
2126: * common case of get sockopt integer value
2127: */
2128: int
2129: sockopt_getint(const struct sockopt *sopt, int *valp)
2130: {
1.1 cgd 2131:
1.171 plunky 2132: return sockopt_get(sopt, valp, sizeof(int));
2133: }
1.1 cgd 2134:
1.171 plunky 2135: /*
2136: * set sockopt value from mbuf
2137: * - ONLY for legacy code
2138: * - mbuf is released by sockopt
1.176 plunky 2139: * - will not sleep
1.171 plunky 2140: */
2141: int
2142: sockopt_setmbuf(struct sockopt *sopt, struct mbuf *m)
2143: {
2144: size_t len;
1.176 plunky 2145: int error;
1.1 cgd 2146:
1.171 plunky 2147: len = m_length(m);
1.1 cgd 2148:
1.176 plunky 2149: if (sopt->sopt_size == 0) {
2150: error = sockopt_alloc(sopt, len, KM_NOSLEEP);
2151: if (error)
2152: return error;
2153: }
1.1 cgd 2154:
1.171 plunky 2155: KASSERT(sopt->sopt_size == len);
2156: m_copydata(m, 0, len, sopt->sopt_data);
2157: m_freem(m);
1.1 cgd 2158:
1.171 plunky 2159: return 0;
2160: }
1.1 cgd 2161:
1.171 plunky 2162: /*
2163: * get sockopt value into mbuf
2164: * - ONLY for legacy code
2165: * - mbuf to be released by the caller
1.176 plunky 2166: * - will not sleep
1.171 plunky 2167: */
2168: struct mbuf *
2169: sockopt_getmbuf(const struct sockopt *sopt)
2170: {
2171: struct mbuf *m;
1.107 darrenr 2172:
1.176 plunky 2173: if (sopt->sopt_size > MCLBYTES)
2174: return NULL;
2175:
2176: m = m_get(M_DONTWAIT, MT_SOOPTS);
1.171 plunky 2177: if (m == NULL)
2178: return NULL;
2179:
1.176 plunky 2180: if (sopt->sopt_size > MLEN) {
2181: MCLGET(m, M_DONTWAIT);
2182: if ((m->m_flags & M_EXT) == 0) {
2183: m_free(m);
2184: return NULL;
2185: }
1.1 cgd 2186: }
1.176 plunky 2187:
2188: memcpy(mtod(m, void *), sopt->sopt_data, sopt->sopt_size);
2189: m->m_len = sopt->sopt_size;
1.160 ad 2190:
1.171 plunky 2191: return m;
1.1 cgd 2192: }
2193:
1.14 mycroft 2194: void
1.54 lukem 2195: sohasoutofband(struct socket *so)
1.1 cgd 2196: {
1.153 rmind 2197:
1.90 christos 2198: fownsignal(so->so_pgid, SIGURG, POLL_PRI, POLLPRI|POLLRDBAND, so);
1.189 ad 2199: selnotify(&so->so_rcv.sb_sel, POLLPRI | POLLRDBAND, NOTE_SUBMIT);
1.1 cgd 2200: }
1.72 jdolecek 2201:
2202: static void
2203: filt_sordetach(struct knote *kn)
2204: {
2205: struct socket *so;
2206:
1.155 ad 2207: so = ((file_t *)kn->kn_obj)->f_data;
1.160 ad 2208: solock(so);
1.73 christos 2209: SLIST_REMOVE(&so->so_rcv.sb_sel.sel_klist, kn, knote, kn_selnext);
2210: if (SLIST_EMPTY(&so->so_rcv.sb_sel.sel_klist))
1.72 jdolecek 2211: so->so_rcv.sb_flags &= ~SB_KNOTE;
1.160 ad 2212: sounlock(so);
1.72 jdolecek 2213: }
2214:
2215: /*ARGSUSED*/
2216: static int
1.129 yamt 2217: filt_soread(struct knote *kn, long hint)
1.72 jdolecek 2218: {
2219: struct socket *so;
1.160 ad 2220: int rv;
1.72 jdolecek 2221:
1.155 ad 2222: so = ((file_t *)kn->kn_obj)->f_data;
1.160 ad 2223: if (hint != NOTE_SUBMIT)
2224: solock(so);
1.72 jdolecek 2225: kn->kn_data = so->so_rcv.sb_cc;
2226: if (so->so_state & SS_CANTRCVMORE) {
1.108 perry 2227: kn->kn_flags |= EV_EOF;
1.72 jdolecek 2228: kn->kn_fflags = so->so_error;
1.160 ad 2229: rv = 1;
2230: } else if (so->so_error) /* temporary udp error */
2231: rv = 1;
2232: else if (kn->kn_sfflags & NOTE_LOWAT)
2233: rv = (kn->kn_data >= kn->kn_sdata);
2234: else
2235: rv = (kn->kn_data >= so->so_rcv.sb_lowat);
2236: if (hint != NOTE_SUBMIT)
2237: sounlock(so);
2238: return rv;
1.72 jdolecek 2239: }
2240:
2241: static void
2242: filt_sowdetach(struct knote *kn)
2243: {
2244: struct socket *so;
2245:
1.155 ad 2246: so = ((file_t *)kn->kn_obj)->f_data;
1.160 ad 2247: solock(so);
1.73 christos 2248: SLIST_REMOVE(&so->so_snd.sb_sel.sel_klist, kn, knote, kn_selnext);
2249: if (SLIST_EMPTY(&so->so_snd.sb_sel.sel_klist))
1.72 jdolecek 2250: so->so_snd.sb_flags &= ~SB_KNOTE;
1.160 ad 2251: sounlock(so);
1.72 jdolecek 2252: }
2253:
2254: /*ARGSUSED*/
2255: static int
1.129 yamt 2256: filt_sowrite(struct knote *kn, long hint)
1.72 jdolecek 2257: {
2258: struct socket *so;
1.160 ad 2259: int rv;
1.72 jdolecek 2260:
1.155 ad 2261: so = ((file_t *)kn->kn_obj)->f_data;
1.160 ad 2262: if (hint != NOTE_SUBMIT)
2263: solock(so);
1.72 jdolecek 2264: kn->kn_data = sbspace(&so->so_snd);
2265: if (so->so_state & SS_CANTSENDMORE) {
1.108 perry 2266: kn->kn_flags |= EV_EOF;
1.72 jdolecek 2267: kn->kn_fflags = so->so_error;
1.160 ad 2268: rv = 1;
2269: } else if (so->so_error) /* temporary udp error */
2270: rv = 1;
2271: else if (((so->so_state & SS_ISCONNECTED) == 0) &&
1.72 jdolecek 2272: (so->so_proto->pr_flags & PR_CONNREQUIRED))
1.160 ad 2273: rv = 0;
2274: else if (kn->kn_sfflags & NOTE_LOWAT)
2275: rv = (kn->kn_data >= kn->kn_sdata);
2276: else
2277: rv = (kn->kn_data >= so->so_snd.sb_lowat);
2278: if (hint != NOTE_SUBMIT)
2279: sounlock(so);
2280: return rv;
1.72 jdolecek 2281: }
2282:
2283: /*ARGSUSED*/
2284: static int
1.129 yamt 2285: filt_solisten(struct knote *kn, long hint)
1.72 jdolecek 2286: {
2287: struct socket *so;
1.160 ad 2288: int rv;
1.72 jdolecek 2289:
1.155 ad 2290: so = ((file_t *)kn->kn_obj)->f_data;
1.72 jdolecek 2291:
2292: /*
2293: * Set kn_data to number of incoming connections, not
2294: * counting partial (incomplete) connections.
1.108 perry 2295: */
1.160 ad 2296: if (hint != NOTE_SUBMIT)
2297: solock(so);
1.72 jdolecek 2298: kn->kn_data = so->so_qlen;
1.160 ad 2299: rv = (kn->kn_data > 0);
2300: if (hint != NOTE_SUBMIT)
2301: sounlock(so);
2302: return rv;
1.72 jdolecek 2303: }
2304:
2305: static const struct filterops solisten_filtops =
2306: { 1, NULL, filt_sordetach, filt_solisten };
2307: static const struct filterops soread_filtops =
2308: { 1, NULL, filt_sordetach, filt_soread };
2309: static const struct filterops sowrite_filtops =
2310: { 1, NULL, filt_sowdetach, filt_sowrite };
2311:
2312: int
1.129 yamt 2313: soo_kqfilter(struct file *fp, struct knote *kn)
1.72 jdolecek 2314: {
2315: struct socket *so;
2316: struct sockbuf *sb;
2317:
1.155 ad 2318: so = ((file_t *)kn->kn_obj)->f_data;
1.160 ad 2319: solock(so);
1.72 jdolecek 2320: switch (kn->kn_filter) {
2321: case EVFILT_READ:
2322: if (so->so_options & SO_ACCEPTCONN)
2323: kn->kn_fop = &solisten_filtops;
2324: else
2325: kn->kn_fop = &soread_filtops;
2326: sb = &so->so_rcv;
2327: break;
2328: case EVFILT_WRITE:
2329: kn->kn_fop = &sowrite_filtops;
2330: sb = &so->so_snd;
2331: break;
2332: default:
1.160 ad 2333: sounlock(so);
1.149 pooka 2334: return (EINVAL);
1.72 jdolecek 2335: }
1.73 christos 2336: SLIST_INSERT_HEAD(&sb->sb_sel.sel_klist, kn, kn_selnext);
1.72 jdolecek 2337: sb->sb_flags |= SB_KNOTE;
1.160 ad 2338: sounlock(so);
1.72 jdolecek 2339: return (0);
2340: }
2341:
1.154 ad 2342: static int
2343: sodopoll(struct socket *so, int events)
2344: {
2345: int revents;
2346:
2347: revents = 0;
2348:
2349: if (events & (POLLIN | POLLRDNORM))
2350: if (soreadable(so))
2351: revents |= events & (POLLIN | POLLRDNORM);
2352:
2353: if (events & (POLLOUT | POLLWRNORM))
2354: if (sowritable(so))
2355: revents |= events & (POLLOUT | POLLWRNORM);
2356:
2357: if (events & (POLLPRI | POLLRDBAND))
2358: if (so->so_oobmark || (so->so_state & SS_RCVATMARK))
2359: revents |= events & (POLLPRI | POLLRDBAND);
2360:
2361: return revents;
2362: }
2363:
2364: int
2365: sopoll(struct socket *so, int events)
2366: {
2367: int revents = 0;
2368:
1.160 ad 2369: #ifndef DIAGNOSTIC
2370: /*
2371: * Do a quick, unlocked check in expectation that the socket
2372: * will be ready for I/O. Don't do this check if DIAGNOSTIC,
2373: * as the solocked() assertions will fail.
2374: */
1.154 ad 2375: if ((revents = sodopoll(so, events)) != 0)
2376: return revents;
1.160 ad 2377: #endif
1.154 ad 2378:
1.160 ad 2379: solock(so);
1.154 ad 2380: if ((revents = sodopoll(so, events)) == 0) {
2381: if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
2382: selrecord(curlwp, &so->so_rcv.sb_sel);
1.160 ad 2383: so->so_rcv.sb_flags |= SB_NOTIFY;
1.154 ad 2384: }
2385:
2386: if (events & (POLLOUT | POLLWRNORM)) {
2387: selrecord(curlwp, &so->so_snd.sb_sel);
1.160 ad 2388: so->so_snd.sb_flags |= SB_NOTIFY;
1.154 ad 2389: }
2390: }
1.160 ad 2391: sounlock(so);
1.154 ad 2392:
2393: return revents;
2394: }
2395:
2396:
1.94 yamt 2397: #include <sys/sysctl.h>
2398:
2399: static int sysctl_kern_somaxkva(SYSCTLFN_PROTO);
2400:
2401: /*
2402: * sysctl helper routine for kern.somaxkva. ensures that the given
2403: * value is not too small.
2404: * (XXX should we maybe make sure it's not too large as well?)
2405: */
2406: static int
2407: sysctl_kern_somaxkva(SYSCTLFN_ARGS)
2408: {
2409: int error, new_somaxkva;
2410: struct sysctlnode node;
2411:
2412: new_somaxkva = somaxkva;
2413: node = *rnode;
2414: node.sysctl_data = &new_somaxkva;
2415: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2416: if (error || newp == NULL)
2417: return (error);
2418:
2419: if (new_somaxkva < (16 * 1024 * 1024)) /* sanity */
2420: return (EINVAL);
2421:
1.136 ad 2422: mutex_enter(&so_pendfree_lock);
1.94 yamt 2423: somaxkva = new_somaxkva;
1.136 ad 2424: cv_broadcast(&socurkva_cv);
2425: mutex_exit(&so_pendfree_lock);
1.94 yamt 2426:
2427: return (error);
2428: }
2429:
1.178 pooka 2430: static void
1.187 cegger 2431: sysctl_kern_somaxkva_setup(void)
1.94 yamt 2432: {
2433:
1.178 pooka 2434: KASSERT(socket_sysctllog == NULL);
2435: sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
1.97 atatat 2436: CTLFLAG_PERMANENT,
2437: CTLTYPE_NODE, "kern", NULL,
2438: NULL, 0, NULL, 0,
2439: CTL_KERN, CTL_EOL);
2440:
1.178 pooka 2441: sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
1.97 atatat 2442: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.103 atatat 2443: CTLTYPE_INT, "somaxkva",
2444: SYSCTL_DESCR("Maximum amount of kernel memory to be "
2445: "used for socket buffers"),
1.94 yamt 2446: sysctl_kern_somaxkva, 0, NULL, 0,
2447: CTL_KERN, KERN_SOMAXKVA, CTL_EOL);
2448: }
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