Annotation of src/sys/kern/uipc_socket.c, Revision 1.207
1.207 ! christos 1: /* $NetBSD: uipc_socket.c,v 1.206 2011/12/20 23:56:28 christos 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>
1.207 ! christos 66: __KERNEL_RCSID(0, "$NetBSD: uipc_socket.c,v 1.206 2011/12/20 23:56:28 christos 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>
1.205 bouyer 95: #include <sys/kthread.h>
1.37 thorpej 96:
1.179 christos 97: #ifdef COMPAT_50
98: #include <compat/sys/time.h>
1.184 christos 99: #include <compat/sys/socket.h>
1.179 christos 100: #endif
101:
1.202 uebayasi 102: #include <uvm/uvm_extern.h>
103: #include <uvm/uvm_loan.h>
104: #include <uvm/uvm_page.h>
1.64 thorpej 105:
1.77 thorpej 106: MALLOC_DEFINE(M_SOOPTS, "soopts", "socket options");
107: MALLOC_DEFINE(M_SONAME, "soname", "socket name");
1.37 thorpej 108:
1.142 dyoung 109: extern const struct fileops socketops;
110:
1.54 lukem 111: extern int somaxconn; /* patchable (XXX sysctl) */
112: int somaxconn = SOMAXCONN;
1.160 ad 113: kmutex_t *softnet_lock;
1.49 jonathan 114:
1.64 thorpej 115: #ifdef SOSEND_COUNTERS
116: #include <sys/device.h>
117:
1.113 thorpej 118: static struct evcnt sosend_loan_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64 thorpej 119: NULL, "sosend", "loan big");
1.113 thorpej 120: static struct evcnt sosend_copy_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64 thorpej 121: NULL, "sosend", "copy big");
1.113 thorpej 122: static struct evcnt sosend_copy_small = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64 thorpej 123: NULL, "sosend", "copy small");
1.113 thorpej 124: static struct evcnt sosend_kvalimit = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64 thorpej 125: NULL, "sosend", "kva limit");
126:
127: #define SOSEND_COUNTER_INCR(ev) (ev)->ev_count++
128:
1.101 matt 129: EVCNT_ATTACH_STATIC(sosend_loan_big);
130: EVCNT_ATTACH_STATIC(sosend_copy_big);
131: EVCNT_ATTACH_STATIC(sosend_copy_small);
132: EVCNT_ATTACH_STATIC(sosend_kvalimit);
1.64 thorpej 133: #else
134:
135: #define SOSEND_COUNTER_INCR(ev) /* nothing */
136:
137: #endif /* SOSEND_COUNTERS */
138:
1.119 yamt 139: static struct callback_entry sokva_reclaimerentry;
1.1 cgd 140:
1.167 ad 141: #if defined(SOSEND_NO_LOAN) || defined(MULTIPROCESSOR)
1.121 yamt 142: int sock_loan_thresh = -1;
1.71 thorpej 143: #else
1.121 yamt 144: int sock_loan_thresh = 4096;
1.65 thorpej 145: #endif
1.64 thorpej 146:
1.136 ad 147: static kmutex_t so_pendfree_lock;
1.205 bouyer 148: static struct mbuf *so_pendfree = NULL;
1.64 thorpej 149:
1.84 ragge 150: #ifndef SOMAXKVA
151: #define SOMAXKVA (16 * 1024 * 1024)
152: #endif
153: int somaxkva = SOMAXKVA;
1.113 thorpej 154: static int socurkva;
1.136 ad 155: static kcondvar_t socurkva_cv;
1.64 thorpej 156:
1.191 elad 157: static kauth_listener_t socket_listener;
158:
1.64 thorpej 159: #define SOCK_LOAN_CHUNK 65536
160:
1.205 bouyer 161: static void sopendfree_thread(void *);
162: static kcondvar_t pendfree_thread_cv;
163: static lwp_t *sopendfree_lwp;
1.93 yamt 164:
1.178 pooka 165: static void sysctl_kern_somaxkva_setup(void);
166: static struct sysctllog *socket_sysctllog;
167:
1.113 thorpej 168: static vsize_t
1.129 yamt 169: sokvareserve(struct socket *so, vsize_t len)
1.80 yamt 170: {
1.98 christos 171: int error;
1.80 yamt 172:
1.136 ad 173: mutex_enter(&so_pendfree_lock);
1.80 yamt 174: while (socurkva + len > somaxkva) {
175: SOSEND_COUNTER_INCR(&sosend_kvalimit);
1.136 ad 176: error = cv_wait_sig(&socurkva_cv, &so_pendfree_lock);
1.98 christos 177: if (error) {
178: len = 0;
179: break;
180: }
1.80 yamt 181: }
1.93 yamt 182: socurkva += len;
1.136 ad 183: mutex_exit(&so_pendfree_lock);
1.98 christos 184: return len;
1.95 yamt 185: }
186:
1.113 thorpej 187: static void
1.95 yamt 188: sokvaunreserve(vsize_t len)
189: {
190:
1.136 ad 191: mutex_enter(&so_pendfree_lock);
1.95 yamt 192: socurkva -= len;
1.136 ad 193: cv_broadcast(&socurkva_cv);
194: mutex_exit(&so_pendfree_lock);
1.95 yamt 195: }
196:
197: /*
198: * sokvaalloc: allocate kva for loan.
199: */
200:
201: vaddr_t
202: sokvaalloc(vsize_t len, struct socket *so)
203: {
204: vaddr_t lva;
205:
206: /*
207: * reserve kva.
208: */
209:
1.98 christos 210: if (sokvareserve(so, len) == 0)
211: return 0;
1.93 yamt 212:
213: /*
214: * allocate kva.
215: */
1.80 yamt 216:
1.109 yamt 217: lva = uvm_km_alloc(kernel_map, len, 0, UVM_KMF_VAONLY | UVM_KMF_WAITVA);
1.95 yamt 218: if (lva == 0) {
219: sokvaunreserve(len);
1.80 yamt 220: return (0);
1.95 yamt 221: }
1.80 yamt 222:
223: return lva;
224: }
225:
1.93 yamt 226: /*
227: * sokvafree: free kva for loan.
228: */
229:
1.80 yamt 230: void
231: sokvafree(vaddr_t sva, vsize_t len)
232: {
1.93 yamt 233:
234: /*
235: * free kva.
236: */
1.80 yamt 237:
1.109 yamt 238: uvm_km_free(kernel_map, sva, len, UVM_KMF_VAONLY);
1.93 yamt 239:
240: /*
241: * unreserve kva.
242: */
243:
1.95 yamt 244: sokvaunreserve(len);
1.80 yamt 245: }
246:
1.64 thorpej 247: static void
1.134 christos 248: sodoloanfree(struct vm_page **pgs, void *buf, size_t size)
1.64 thorpej 249: {
1.156 yamt 250: vaddr_t sva, eva;
1.64 thorpej 251: vsize_t len;
1.156 yamt 252: int npgs;
253:
254: KASSERT(pgs != NULL);
1.64 thorpej 255:
256: eva = round_page((vaddr_t) buf + size);
257: sva = trunc_page((vaddr_t) buf);
258: len = eva - sva;
259: npgs = len >> PAGE_SHIFT;
260:
261: pmap_kremove(sva, len);
262: pmap_update(pmap_kernel());
263: uvm_unloan(pgs, npgs, UVM_LOAN_TOPAGE);
1.80 yamt 264: sokvafree(sva, len);
1.64 thorpej 265: }
266:
1.93 yamt 267: /*
1.205 bouyer 268: * sopendfree_thread: free mbufs on "pendfree" list.
1.136 ad 269: * unlock and relock so_pendfree_lock when freeing mbufs.
1.93 yamt 270: */
271:
1.205 bouyer 272: static void
273: sopendfree_thread(void *v)
1.93 yamt 274: {
1.137 ad 275: struct mbuf *m, *next;
1.205 bouyer 276: size_t rv;
1.93 yamt 277:
1.205 bouyer 278: mutex_enter(&so_pendfree_lock);
1.64 thorpej 279:
1.205 bouyer 280: for (;;) {
281: rv = 0;
282: while (so_pendfree != NULL) {
283: m = so_pendfree;
284: so_pendfree = NULL;
285: mutex_exit(&so_pendfree_lock);
286:
287: for (; m != NULL; m = next) {
288: next = m->m_next;
289: KASSERT((~m->m_flags & (M_EXT|M_EXT_PAGES)) == 0);
290: KASSERT(m->m_ext.ext_refcnt == 0);
291:
292: rv += m->m_ext.ext_size;
293: sodoloanfree(m->m_ext.ext_pgs, m->m_ext.ext_buf,
294: m->m_ext.ext_size);
295: pool_cache_put(mb_cache, m);
296: }
1.93 yamt 297:
1.205 bouyer 298: mutex_enter(&so_pendfree_lock);
1.93 yamt 299: }
1.205 bouyer 300: if (rv)
301: cv_broadcast(&socurkva_cv);
302: cv_wait(&pendfree_thread_cv, &so_pendfree_lock);
1.64 thorpej 303: }
1.205 bouyer 304: panic("sopendfree_thread");
305: /* NOTREACHED */
1.64 thorpej 306: }
307:
1.80 yamt 308: void
1.134 christos 309: soloanfree(struct mbuf *m, void *buf, size_t size, void *arg)
1.64 thorpej 310: {
311:
1.156 yamt 312: KASSERT(m != NULL);
1.64 thorpej 313:
1.93 yamt 314: /*
315: * postpone freeing mbuf.
316: *
317: * we can't do it in interrupt context
318: * because we need to put kva back to kernel_map.
319: */
320:
1.136 ad 321: mutex_enter(&so_pendfree_lock);
1.92 yamt 322: m->m_next = so_pendfree;
323: so_pendfree = m;
1.205 bouyer 324: cv_signal(&pendfree_thread_cv);
1.136 ad 325: mutex_exit(&so_pendfree_lock);
1.64 thorpej 326: }
327:
328: static long
329: sosend_loan(struct socket *so, struct uio *uio, struct mbuf *m, long space)
330: {
331: struct iovec *iov = uio->uio_iov;
332: vaddr_t sva, eva;
333: vsize_t len;
1.156 yamt 334: vaddr_t lva;
335: int npgs, error;
336: vaddr_t va;
337: int i;
1.64 thorpej 338:
1.116 yamt 339: if (VMSPACE_IS_KERNEL_P(uio->uio_vmspace))
1.64 thorpej 340: return (0);
341:
342: if (iov->iov_len < (size_t) space)
343: space = iov->iov_len;
344: if (space > SOCK_LOAN_CHUNK)
345: space = SOCK_LOAN_CHUNK;
346:
347: eva = round_page((vaddr_t) iov->iov_base + space);
348: sva = trunc_page((vaddr_t) iov->iov_base);
349: len = eva - sva;
350: npgs = len >> PAGE_SHIFT;
351:
1.79 thorpej 352: KASSERT(npgs <= M_EXT_MAXPAGES);
353:
1.80 yamt 354: lva = sokvaalloc(len, so);
1.64 thorpej 355: if (lva == 0)
1.80 yamt 356: return 0;
1.64 thorpej 357:
1.116 yamt 358: error = uvm_loan(&uio->uio_vmspace->vm_map, sva, len,
1.79 thorpej 359: m->m_ext.ext_pgs, UVM_LOAN_TOPAGE);
1.64 thorpej 360: if (error) {
1.80 yamt 361: sokvafree(lva, len);
1.64 thorpej 362: return (0);
363: }
364:
365: for (i = 0, va = lva; i < npgs; i++, va += PAGE_SIZE)
1.79 thorpej 366: pmap_kenter_pa(va, VM_PAGE_TO_PHYS(m->m_ext.ext_pgs[i]),
1.194 cegger 367: VM_PROT_READ, 0);
1.64 thorpej 368: pmap_update(pmap_kernel());
369:
370: lva += (vaddr_t) iov->iov_base & PAGE_MASK;
371:
1.134 christos 372: MEXTADD(m, (void *) lva, space, M_MBUF, soloanfree, so);
1.79 thorpej 373: m->m_flags |= M_EXT_PAGES | M_EXT_ROMAP;
1.64 thorpej 374:
375: uio->uio_resid -= space;
376: /* uio_offset not updated, not set/used for write(2) */
1.134 christos 377: uio->uio_iov->iov_base = (char *)uio->uio_iov->iov_base + space;
1.64 thorpej 378: uio->uio_iov->iov_len -= space;
379: if (uio->uio_iov->iov_len == 0) {
380: uio->uio_iov++;
381: uio->uio_iovcnt--;
382: }
383:
384: return (space);
385: }
386:
1.119 yamt 387: static int
1.129 yamt 388: sokva_reclaim_callback(struct callback_entry *ce, void *obj, void *arg)
1.119 yamt 389: {
390:
391: KASSERT(ce == &sokva_reclaimerentry);
392: KASSERT(obj == NULL);
393:
394: if (!vm_map_starved_p(kernel_map)) {
395: return CALLBACK_CHAIN_ABORT;
396: }
397: return CALLBACK_CHAIN_CONTINUE;
398: }
399:
1.142 dyoung 400: struct mbuf *
1.147 dyoung 401: getsombuf(struct socket *so, int type)
1.142 dyoung 402: {
403: struct mbuf *m;
404:
1.147 dyoung 405: m = m_get(M_WAIT, type);
1.142 dyoung 406: MCLAIM(m, so->so_mowner);
407: return m;
408: }
409:
1.191 elad 410: static int
411: socket_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie,
412: void *arg0, void *arg1, void *arg2, void *arg3)
413: {
414: int result;
415: enum kauth_network_req req;
416:
417: result = KAUTH_RESULT_DEFER;
418: req = (enum kauth_network_req)arg0;
419:
1.193 elad 420: if ((action != KAUTH_NETWORK_SOCKET) &&
421: (action != KAUTH_NETWORK_BIND))
1.191 elad 422: return result;
423:
424: switch (req) {
1.193 elad 425: case KAUTH_REQ_NETWORK_BIND_PORT:
426: result = KAUTH_RESULT_ALLOW;
427: break;
428:
1.191 elad 429: case KAUTH_REQ_NETWORK_SOCKET_DROP: {
430: /* Normal users can only drop their own connections. */
431: struct socket *so = (struct socket *)arg1;
432:
1.199 elad 433: if (proc_uidmatch(cred, so->so_cred))
1.191 elad 434: result = KAUTH_RESULT_ALLOW;
435:
436: break;
437: }
438:
439: case KAUTH_REQ_NETWORK_SOCKET_OPEN:
440: /* We allow "raw" routing/bluetooth sockets to anyone. */
1.203 matt 441: if ((u_long)arg1 == PF_ROUTE || (u_long)arg1 == PF_OROUTE
442: || (u_long)arg1 == PF_BLUETOOTH) {
1.191 elad 443: result = KAUTH_RESULT_ALLOW;
1.203 matt 444: } else {
1.191 elad 445: /* Privileged, let secmodel handle this. */
446: if ((u_long)arg2 == SOCK_RAW)
447: break;
448: }
449:
450: result = KAUTH_RESULT_ALLOW;
451:
452: break;
453:
1.192 elad 454: case KAUTH_REQ_NETWORK_SOCKET_CANSEE:
455: result = KAUTH_RESULT_ALLOW;
456:
457: break;
458:
1.191 elad 459: default:
460: break;
461: }
462:
463: return result;
464: }
465:
1.119 yamt 466: void
467: soinit(void)
468: {
469:
1.178 pooka 470: sysctl_kern_somaxkva_setup();
471:
1.148 ad 472: mutex_init(&so_pendfree_lock, MUTEX_DEFAULT, IPL_VM);
1.160 ad 473: softnet_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
1.136 ad 474: cv_init(&socurkva_cv, "sokva");
1.205 bouyer 475: cv_init(&pendfree_thread_cv, "sopendfr");
1.166 ad 476: soinit2();
1.136 ad 477:
1.119 yamt 478: /* Set the initial adjusted socket buffer size. */
479: if (sb_max_set(sb_max))
480: panic("bad initial sb_max value: %lu", sb_max);
481:
482: callback_register(&vm_map_to_kernel(kernel_map)->vmk_reclaim_callback,
483: &sokva_reclaimerentry, NULL, sokva_reclaim_callback);
1.191 elad 484:
485: socket_listener = kauth_listen_scope(KAUTH_SCOPE_NETWORK,
486: socket_listener_cb, NULL);
1.119 yamt 487: }
488:
1.205 bouyer 489: void
490: soinit1(void)
491: {
492: int error = kthread_create(PRI_NONE, KTHREAD_MPSAFE, NULL,
493: sopendfree_thread, NULL, &sopendfree_lwp, "sopendfree");
494: if (error)
495: panic("soinit1 %d", error);
496: }
497:
1.1 cgd 498: /*
499: * Socket operation routines.
500: * These routines are called by the routines in
501: * sys_socket.c or from a system process, and
502: * implement the semantics of socket operations by
503: * switching out to the protocol specific routines.
504: */
505: /*ARGSUSED*/
1.3 andrew 506: int
1.160 ad 507: socreate(int dom, struct socket **aso, int type, int proto, struct lwp *l,
508: struct socket *lockso)
1.1 cgd 509: {
1.99 matt 510: const struct protosw *prp;
1.54 lukem 511: struct socket *so;
1.115 yamt 512: uid_t uid;
1.160 ad 513: int error;
514: kmutex_t *lock;
1.1 cgd 515:
1.132 elad 516: error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_SOCKET,
517: KAUTH_REQ_NETWORK_SOCKET_OPEN, KAUTH_ARG(dom), KAUTH_ARG(type),
518: KAUTH_ARG(proto));
1.140 dyoung 519: if (error != 0)
520: return error;
1.127 elad 521:
1.1 cgd 522: if (proto)
523: prp = pffindproto(dom, proto, type);
524: else
525: prp = pffindtype(dom, type);
1.140 dyoung 526: if (prp == NULL) {
1.120 ginsbach 527: /* no support for domain */
528: if (pffinddomain(dom) == 0)
1.140 dyoung 529: return EAFNOSUPPORT;
1.120 ginsbach 530: /* no support for socket type */
531: if (proto == 0 && type != 0)
1.140 dyoung 532: return EPROTOTYPE;
533: return EPROTONOSUPPORT;
1.120 ginsbach 534: }
1.140 dyoung 535: if (prp->pr_usrreq == NULL)
536: return EPROTONOSUPPORT;
1.1 cgd 537: if (prp->pr_type != type)
1.140 dyoung 538: return EPROTOTYPE;
1.160 ad 539:
540: so = soget(true);
1.1 cgd 541: so->so_type = type;
542: so->so_proto = prp;
1.33 matt 543: so->so_send = sosend;
544: so->so_receive = soreceive;
1.78 matt 545: #ifdef MBUFTRACE
546: so->so_rcv.sb_mowner = &prp->pr_domain->dom_mowner;
547: so->so_snd.sb_mowner = &prp->pr_domain->dom_mowner;
548: so->so_mowner = &prp->pr_domain->dom_mowner;
549: #endif
1.138 rmind 550: uid = kauth_cred_geteuid(l->l_cred);
1.115 yamt 551: so->so_uidinfo = uid_find(uid);
1.168 yamt 552: so->so_cpid = l->l_proc->p_pid;
1.160 ad 553: if (lockso != NULL) {
554: /* Caller wants us to share a lock. */
555: lock = lockso->so_lock;
556: so->so_lock = lock;
557: mutex_obj_hold(lock);
558: mutex_enter(lock);
559: } else {
560: /* Lock assigned and taken during PRU_ATTACH. */
561: }
1.140 dyoung 562: error = (*prp->pr_usrreq)(so, PRU_ATTACH, NULL,
563: (struct mbuf *)(long)proto, NULL, l);
1.160 ad 564: KASSERT(solocked(so));
1.140 dyoung 565: if (error != 0) {
1.1 cgd 566: so->so_state |= SS_NOFDREF;
567: sofree(so);
1.140 dyoung 568: return error;
1.1 cgd 569: }
1.198 elad 570: so->so_cred = kauth_cred_dup(l->l_cred);
1.160 ad 571: sounlock(so);
1.1 cgd 572: *aso = so;
1.140 dyoung 573: return 0;
1.1 cgd 574: }
575:
1.142 dyoung 576: /* On success, write file descriptor to fdout and return zero. On
577: * failure, return non-zero; *fdout will be undefined.
578: */
579: int
580: fsocreate(int domain, struct socket **sop, int type, int protocol,
581: struct lwp *l, int *fdout)
582: {
583: struct socket *so;
584: struct file *fp;
585: int fd, error;
1.204 christos 586: int flags = type & SOCK_FLAGS_MASK;
1.142 dyoung 587:
1.204 christos 588: type &= ~SOCK_FLAGS_MASK;
1.155 ad 589: if ((error = fd_allocfile(&fp, &fd)) != 0)
1.204 christos 590: return error;
591: fd_set_exclose(l, fd, (flags & SOCK_CLOEXEC) != 0);
1.207 ! christos 592: fp->f_flag = FREAD|FWRITE|((flags & SOCK_NONBLOCK) ? FNONBLOCK : 0)|
! 593: ((flags & SOCK_NOSIGPIPE) ? FNOSIGPIPE : 0);
1.142 dyoung 594: fp->f_type = DTYPE_SOCKET;
595: fp->f_ops = &socketops;
1.160 ad 596: error = socreate(domain, &so, type, protocol, l, NULL);
1.142 dyoung 597: if (error != 0) {
1.155 ad 598: fd_abort(curproc, fp, fd);
1.142 dyoung 599: } else {
600: if (sop != NULL)
601: *sop = so;
602: fp->f_data = so;
1.155 ad 603: fd_affix(curproc, fp, fd);
1.142 dyoung 604: *fdout = fd;
605: }
606: return error;
607: }
608:
1.3 andrew 609: int
1.190 dyoung 610: sofamily(const struct socket *so)
611: {
612: const struct protosw *pr;
613: const struct domain *dom;
614:
615: if ((pr = so->so_proto) == NULL)
616: return AF_UNSPEC;
617: if ((dom = pr->pr_domain) == NULL)
618: return AF_UNSPEC;
619: return dom->dom_family;
620: }
621:
622: int
1.114 christos 623: sobind(struct socket *so, struct mbuf *nam, struct lwp *l)
1.1 cgd 624: {
1.160 ad 625: int error;
1.1 cgd 626:
1.160 ad 627: solock(so);
1.140 dyoung 628: error = (*so->so_proto->pr_usrreq)(so, PRU_BIND, NULL, nam, NULL, l);
1.160 ad 629: sounlock(so);
1.140 dyoung 630: return error;
1.1 cgd 631: }
632:
1.3 andrew 633: int
1.150 elad 634: solisten(struct socket *so, int backlog, struct lwp *l)
1.1 cgd 635: {
1.160 ad 636: int error;
1.1 cgd 637:
1.160 ad 638: solock(so);
1.158 ad 639: if ((so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING |
1.163 ad 640: SS_ISDISCONNECTING)) != 0) {
641: sounlock(so);
1.158 ad 642: return (EOPNOTSUPP);
1.163 ad 643: }
1.140 dyoung 644: error = (*so->so_proto->pr_usrreq)(so, PRU_LISTEN, NULL,
1.150 elad 645: NULL, NULL, l);
1.140 dyoung 646: if (error != 0) {
1.160 ad 647: sounlock(so);
1.140 dyoung 648: return error;
1.1 cgd 649: }
1.63 matt 650: if (TAILQ_EMPTY(&so->so_q))
1.1 cgd 651: so->so_options |= SO_ACCEPTCONN;
652: if (backlog < 0)
653: backlog = 0;
1.49 jonathan 654: so->so_qlimit = min(backlog, somaxconn);
1.160 ad 655: sounlock(so);
1.140 dyoung 656: return 0;
1.1 cgd 657: }
658:
1.21 christos 659: void
1.54 lukem 660: sofree(struct socket *so)
1.1 cgd 661: {
1.161 ad 662: u_int refs;
1.1 cgd 663:
1.160 ad 664: KASSERT(solocked(so));
665:
666: if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0) {
667: sounlock(so);
1.1 cgd 668: return;
1.160 ad 669: }
1.43 mycroft 670: if (so->so_head) {
671: /*
672: * We must not decommission a socket that's on the accept(2)
673: * queue. If we do, then accept(2) may hang after select(2)
674: * indicated that the listening socket was ready.
675: */
1.160 ad 676: if (!soqremque(so, 0)) {
677: sounlock(so);
1.43 mycroft 678: return;
1.160 ad 679: }
1.43 mycroft 680: }
1.98 christos 681: if (so->so_rcv.sb_hiwat)
1.110 christos 682: (void)chgsbsize(so->so_uidinfo, &so->so_rcv.sb_hiwat, 0,
1.98 christos 683: RLIM_INFINITY);
684: if (so->so_snd.sb_hiwat)
1.110 christos 685: (void)chgsbsize(so->so_uidinfo, &so->so_snd.sb_hiwat, 0,
1.98 christos 686: RLIM_INFINITY);
687: sbrelease(&so->so_snd, so);
1.160 ad 688: KASSERT(!cv_has_waiters(&so->so_cv));
689: KASSERT(!cv_has_waiters(&so->so_rcv.sb_cv));
690: KASSERT(!cv_has_waiters(&so->so_snd.sb_cv));
1.1 cgd 691: sorflush(so);
1.161 ad 692: refs = so->so_aborting; /* XXX */
1.177 ad 693: /* Remove acccept filter if one is present. */
1.170 tls 694: if (so->so_accf != NULL)
1.177 ad 695: (void)accept_filt_clear(so);
1.160 ad 696: sounlock(so);
1.161 ad 697: if (refs == 0) /* XXX */
698: soput(so);
1.1 cgd 699: }
700:
701: /*
702: * Close a socket on last file table reference removal.
703: * Initiate disconnect if connected.
704: * Free socket when disconnect complete.
705: */
1.3 andrew 706: int
1.54 lukem 707: soclose(struct socket *so)
1.1 cgd 708: {
1.54 lukem 709: struct socket *so2;
1.160 ad 710: int error;
711: int error2;
1.1 cgd 712:
1.54 lukem 713: error = 0;
1.160 ad 714: solock(so);
1.1 cgd 715: if (so->so_options & SO_ACCEPTCONN) {
1.172 ad 716: for (;;) {
717: if ((so2 = TAILQ_FIRST(&so->so_q0)) != 0) {
1.160 ad 718: KASSERT(solocked2(so, so2));
719: (void) soqremque(so2, 0);
720: /* soabort drops the lock. */
721: (void) soabort(so2);
722: solock(so);
1.172 ad 723: continue;
1.160 ad 724: }
1.172 ad 725: if ((so2 = TAILQ_FIRST(&so->so_q)) != 0) {
1.160 ad 726: KASSERT(solocked2(so, so2));
727: (void) soqremque(so2, 1);
728: /* soabort drops the lock. */
729: (void) soabort(so2);
730: solock(so);
1.172 ad 731: continue;
1.160 ad 732: }
1.172 ad 733: break;
734: }
1.1 cgd 735: }
736: if (so->so_pcb == 0)
737: goto discard;
738: if (so->so_state & SS_ISCONNECTED) {
739: if ((so->so_state & SS_ISDISCONNECTING) == 0) {
740: error = sodisconnect(so);
741: if (error)
742: goto drop;
743: }
744: if (so->so_options & SO_LINGER) {
1.206 christos 745: if ((so->so_state & (SS_ISDISCONNECTING|SS_NBIO)) ==
746: (SS_ISDISCONNECTING|SS_NBIO))
1.1 cgd 747: goto drop;
1.21 christos 748: while (so->so_state & SS_ISCONNECTED) {
1.185 yamt 749: error = sowait(so, true, so->so_linger * hz);
1.21 christos 750: if (error)
1.1 cgd 751: break;
1.21 christos 752: }
1.1 cgd 753: }
754: }
1.54 lukem 755: drop:
1.1 cgd 756: if (so->so_pcb) {
1.160 ad 757: error2 = (*so->so_proto->pr_usrreq)(so, PRU_DETACH,
1.140 dyoung 758: NULL, NULL, NULL, NULL);
1.1 cgd 759: if (error == 0)
760: error = error2;
761: }
1.54 lukem 762: discard:
1.1 cgd 763: if (so->so_state & SS_NOFDREF)
764: panic("soclose: NOFDREF");
1.198 elad 765: kauth_cred_free(so->so_cred);
1.1 cgd 766: so->so_state |= SS_NOFDREF;
767: sofree(so);
768: return (error);
769: }
770:
771: /*
1.160 ad 772: * Must be called with the socket locked.. Will return with it unlocked.
1.1 cgd 773: */
1.3 andrew 774: int
1.54 lukem 775: soabort(struct socket *so)
1.1 cgd 776: {
1.161 ad 777: u_int refs;
1.139 yamt 778: int error;
1.160 ad 779:
780: KASSERT(solocked(so));
781: KASSERT(so->so_head == NULL);
1.1 cgd 782:
1.161 ad 783: so->so_aborting++; /* XXX */
1.140 dyoung 784: error = (*so->so_proto->pr_usrreq)(so, PRU_ABORT, NULL,
785: NULL, NULL, NULL);
1.161 ad 786: refs = --so->so_aborting; /* XXX */
1.164 drochner 787: if (error || (refs == 0)) {
1.139 yamt 788: sofree(so);
1.160 ad 789: } else {
790: sounlock(so);
1.139 yamt 791: }
792: return error;
1.1 cgd 793: }
794:
1.3 andrew 795: int
1.54 lukem 796: soaccept(struct socket *so, struct mbuf *nam)
1.1 cgd 797: {
1.160 ad 798: int error;
799:
800: KASSERT(solocked(so));
1.1 cgd 801:
1.54 lukem 802: error = 0;
1.1 cgd 803: if ((so->so_state & SS_NOFDREF) == 0)
804: panic("soaccept: !NOFDREF");
805: so->so_state &= ~SS_NOFDREF;
1.55 thorpej 806: if ((so->so_state & SS_ISDISCONNECTED) == 0 ||
807: (so->so_proto->pr_flags & PR_ABRTACPTDIS) == 0)
1.41 mycroft 808: error = (*so->so_proto->pr_usrreq)(so, PRU_ACCEPT,
1.140 dyoung 809: NULL, nam, NULL, NULL);
1.41 mycroft 810: else
1.53 itojun 811: error = ECONNABORTED;
1.52 itojun 812:
1.1 cgd 813: return (error);
814: }
815:
1.3 andrew 816: int
1.114 christos 817: soconnect(struct socket *so, struct mbuf *nam, struct lwp *l)
1.1 cgd 818: {
1.160 ad 819: int error;
820:
821: KASSERT(solocked(so));
1.1 cgd 822:
823: if (so->so_options & SO_ACCEPTCONN)
824: return (EOPNOTSUPP);
825: /*
826: * If protocol is connection-based, can only connect once.
827: * Otherwise, if connected, try to disconnect first.
828: * This allows user to disconnect by connecting to, e.g.,
829: * a null address.
830: */
831: if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
832: ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
833: (error = sodisconnect(so))))
834: error = EISCONN;
835: else
836: error = (*so->so_proto->pr_usrreq)(so, PRU_CONNECT,
1.140 dyoung 837: NULL, nam, NULL, l);
1.1 cgd 838: return (error);
839: }
840:
1.3 andrew 841: int
1.54 lukem 842: soconnect2(struct socket *so1, struct socket *so2)
1.1 cgd 843: {
1.160 ad 844: int error;
845:
846: KASSERT(solocked2(so1, so2));
1.1 cgd 847:
1.22 mycroft 848: error = (*so1->so_proto->pr_usrreq)(so1, PRU_CONNECT2,
1.140 dyoung 849: NULL, (struct mbuf *)so2, NULL, NULL);
1.1 cgd 850: return (error);
851: }
852:
1.3 andrew 853: int
1.54 lukem 854: sodisconnect(struct socket *so)
1.1 cgd 855: {
1.160 ad 856: int error;
857:
858: KASSERT(solocked(so));
1.1 cgd 859:
860: if ((so->so_state & SS_ISCONNECTED) == 0) {
861: error = ENOTCONN;
1.160 ad 862: } else if (so->so_state & SS_ISDISCONNECTING) {
1.1 cgd 863: error = EALREADY;
1.160 ad 864: } else {
865: error = (*so->so_proto->pr_usrreq)(so, PRU_DISCONNECT,
866: NULL, NULL, NULL, NULL);
1.1 cgd 867: }
868: return (error);
869: }
870:
1.15 mycroft 871: #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK)
1.1 cgd 872: /*
873: * Send on a socket.
874: * If send must go all at once and message is larger than
875: * send buffering, then hard error.
876: * Lock against other senders.
877: * If must go all at once and not enough room now, then
878: * inform user that this would block and do nothing.
879: * Otherwise, if nonblocking, send as much as possible.
880: * The data to be sent is described by "uio" if nonzero,
881: * otherwise by the mbuf chain "top" (which must be null
882: * if uio is not). Data provided in mbuf chain must be small
883: * enough to send all at once.
884: *
885: * Returns nonzero on error, timeout or signal; callers
886: * must check for short counts if EINTR/ERESTART are returned.
887: * Data and control buffers are freed on return.
888: */
1.3 andrew 889: int
1.54 lukem 890: sosend(struct socket *so, struct mbuf *addr, struct uio *uio, struct mbuf *top,
1.114 christos 891: struct mbuf *control, int flags, struct lwp *l)
1.1 cgd 892: {
1.54 lukem 893: struct mbuf **mp, *m;
1.114 christos 894: struct proc *p;
1.58 jdolecek 895: long space, len, resid, clen, mlen;
896: int error, s, dontroute, atomic;
1.196 dsl 897: short wakeup_state = 0;
1.54 lukem 898:
1.114 christos 899: p = l->l_proc;
1.160 ad 900: clen = 0;
1.64 thorpej 901:
1.160 ad 902: /*
903: * solock() provides atomicity of access. splsoftnet() prevents
904: * protocol processing soft interrupts from interrupting us and
905: * blocking (expensive).
906: */
907: s = splsoftnet();
908: solock(so);
1.54 lukem 909: atomic = sosendallatonce(so) || top;
1.1 cgd 910: if (uio)
911: resid = uio->uio_resid;
912: else
913: resid = top->m_pkthdr.len;
1.7 cgd 914: /*
915: * In theory resid should be unsigned.
916: * However, space must be signed, as it might be less than 0
917: * if we over-committed, and we must use a signed comparison
918: * of space and resid. On the other hand, a negative resid
919: * causes us to loop sending 0-length segments to the protocol.
920: */
1.29 mycroft 921: if (resid < 0) {
922: error = EINVAL;
923: goto out;
924: }
1.1 cgd 925: dontroute =
926: (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
927: (so->so_proto->pr_flags & PR_ATOMIC);
1.165 christos 928: l->l_ru.ru_msgsnd++;
1.1 cgd 929: if (control)
930: clen = control->m_len;
1.54 lukem 931: restart:
1.21 christos 932: if ((error = sblock(&so->so_snd, SBLOCKWAIT(flags))) != 0)
1.1 cgd 933: goto out;
934: do {
1.160 ad 935: if (so->so_state & SS_CANTSENDMORE) {
936: error = EPIPE;
937: goto release;
938: }
1.48 thorpej 939: if (so->so_error) {
940: error = so->so_error;
941: so->so_error = 0;
942: goto release;
943: }
1.1 cgd 944: if ((so->so_state & SS_ISCONNECTED) == 0) {
945: if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
946: if ((so->so_state & SS_ISCONFIRMING) == 0 &&
1.160 ad 947: !(resid == 0 && clen != 0)) {
948: error = ENOTCONN;
949: goto release;
950: }
951: } else if (addr == 0) {
952: error = EDESTADDRREQ;
953: goto release;
954: }
1.1 cgd 955: }
956: space = sbspace(&so->so_snd);
957: if (flags & MSG_OOB)
958: space += 1024;
1.21 christos 959: if ((atomic && resid > so->so_snd.sb_hiwat) ||
1.160 ad 960: clen > so->so_snd.sb_hiwat) {
961: error = EMSGSIZE;
962: goto release;
963: }
1.96 mycroft 964: if (space < resid + clen &&
1.1 cgd 965: (atomic || space < so->so_snd.sb_lowat || space < clen)) {
1.206 christos 966: if ((so->so_state & SS_NBIO) || (flags & MSG_NBIO)) {
1.160 ad 967: error = EWOULDBLOCK;
968: goto release;
969: }
1.1 cgd 970: sbunlock(&so->so_snd);
1.196 dsl 971: if (wakeup_state & SS_RESTARTSYS) {
972: error = ERESTART;
973: goto out;
974: }
1.1 cgd 975: error = sbwait(&so->so_snd);
976: if (error)
977: goto out;
1.196 dsl 978: wakeup_state = so->so_state;
1.1 cgd 979: goto restart;
980: }
1.196 dsl 981: wakeup_state = 0;
1.1 cgd 982: mp = ⊤
983: space -= clen;
984: do {
1.45 tv 985: if (uio == NULL) {
986: /*
987: * Data is prepackaged in "top".
988: */
989: resid = 0;
990: if (flags & MSG_EOR)
991: top->m_flags |= M_EOR;
992: } else do {
1.160 ad 993: sounlock(so);
994: splx(s);
1.144 dyoung 995: if (top == NULL) {
1.78 matt 996: m = m_gethdr(M_WAIT, MT_DATA);
1.45 tv 997: mlen = MHLEN;
998: m->m_pkthdr.len = 0;
1.140 dyoung 999: m->m_pkthdr.rcvif = NULL;
1.45 tv 1000: } else {
1.78 matt 1001: m = m_get(M_WAIT, MT_DATA);
1.45 tv 1002: mlen = MLEN;
1003: }
1.78 matt 1004: MCLAIM(m, so->so_snd.sb_mowner);
1.121 yamt 1005: if (sock_loan_thresh >= 0 &&
1006: uio->uio_iov->iov_len >= sock_loan_thresh &&
1007: space >= sock_loan_thresh &&
1.64 thorpej 1008: (len = sosend_loan(so, uio, m,
1009: space)) != 0) {
1010: SOSEND_COUNTER_INCR(&sosend_loan_big);
1011: space -= len;
1012: goto have_data;
1013: }
1.45 tv 1014: if (resid >= MINCLSIZE && space >= MCLBYTES) {
1.64 thorpej 1015: SOSEND_COUNTER_INCR(&sosend_copy_big);
1.201 oki 1016: m_clget(m, M_DONTWAIT);
1.45 tv 1017: if ((m->m_flags & M_EXT) == 0)
1018: goto nopages;
1019: mlen = MCLBYTES;
1020: if (atomic && top == 0) {
1.58 jdolecek 1021: len = lmin(MCLBYTES - max_hdr,
1.54 lukem 1022: resid);
1.45 tv 1023: m->m_data += max_hdr;
1024: } else
1.58 jdolecek 1025: len = lmin(MCLBYTES, resid);
1.45 tv 1026: space -= len;
1027: } else {
1.64 thorpej 1028: nopages:
1029: SOSEND_COUNTER_INCR(&sosend_copy_small);
1.58 jdolecek 1030: len = lmin(lmin(mlen, resid), space);
1.45 tv 1031: space -= len;
1032: /*
1033: * For datagram protocols, leave room
1034: * for protocol headers in first mbuf.
1035: */
1036: if (atomic && top == 0 && len < mlen)
1037: MH_ALIGN(m, len);
1038: }
1.144 dyoung 1039: error = uiomove(mtod(m, void *), (int)len, uio);
1.64 thorpej 1040: have_data:
1.45 tv 1041: resid = uio->uio_resid;
1042: m->m_len = len;
1043: *mp = m;
1044: top->m_pkthdr.len += len;
1.160 ad 1045: s = splsoftnet();
1046: solock(so);
1.144 dyoung 1047: if (error != 0)
1.45 tv 1048: goto release;
1049: mp = &m->m_next;
1050: if (resid <= 0) {
1051: if (flags & MSG_EOR)
1052: top->m_flags |= M_EOR;
1053: break;
1054: }
1055: } while (space > 0 && atomic);
1.108 perry 1056:
1.160 ad 1057: if (so->so_state & SS_CANTSENDMORE) {
1058: error = EPIPE;
1059: goto release;
1060: }
1.45 tv 1061: if (dontroute)
1062: so->so_options |= SO_DONTROUTE;
1063: if (resid > 0)
1064: so->so_state |= SS_MORETOCOME;
1.46 sommerfe 1065: error = (*so->so_proto->pr_usrreq)(so,
1066: (flags & MSG_OOB) ? PRU_SENDOOB : PRU_SEND,
1.160 ad 1067: top, addr, control, curlwp);
1.45 tv 1068: if (dontroute)
1069: so->so_options &= ~SO_DONTROUTE;
1070: if (resid > 0)
1071: so->so_state &= ~SS_MORETOCOME;
1072: clen = 0;
1.144 dyoung 1073: control = NULL;
1074: top = NULL;
1.45 tv 1075: mp = ⊤
1.144 dyoung 1076: if (error != 0)
1.1 cgd 1077: goto release;
1078: } while (resid && space > 0);
1079: } while (resid);
1080:
1.54 lukem 1081: release:
1.1 cgd 1082: sbunlock(&so->so_snd);
1.54 lukem 1083: out:
1.160 ad 1084: sounlock(so);
1085: splx(s);
1.1 cgd 1086: if (top)
1087: m_freem(top);
1088: if (control)
1089: m_freem(control);
1090: return (error);
1091: }
1092:
1093: /*
1.159 ad 1094: * Following replacement or removal of the first mbuf on the first
1095: * mbuf chain of a socket buffer, push necessary state changes back
1096: * into the socket buffer so that other consumers see the values
1097: * consistently. 'nextrecord' is the callers locally stored value of
1098: * the original value of sb->sb_mb->m_nextpkt which must be restored
1099: * when the lead mbuf changes. NOTE: 'nextrecord' may be NULL.
1100: */
1101: static void
1102: sbsync(struct sockbuf *sb, struct mbuf *nextrecord)
1103: {
1104:
1.160 ad 1105: KASSERT(solocked(sb->sb_so));
1106:
1.159 ad 1107: /*
1108: * First, update for the new value of nextrecord. If necessary,
1109: * make it the first record.
1110: */
1111: if (sb->sb_mb != NULL)
1112: sb->sb_mb->m_nextpkt = nextrecord;
1113: else
1114: sb->sb_mb = nextrecord;
1115:
1116: /*
1117: * Now update any dependent socket buffer fields to reflect
1118: * the new state. This is an inline of SB_EMPTY_FIXUP, with
1119: * the addition of a second clause that takes care of the
1120: * case where sb_mb has been updated, but remains the last
1121: * record.
1122: */
1123: if (sb->sb_mb == NULL) {
1124: sb->sb_mbtail = NULL;
1125: sb->sb_lastrecord = NULL;
1126: } else if (sb->sb_mb->m_nextpkt == NULL)
1127: sb->sb_lastrecord = sb->sb_mb;
1128: }
1129:
1130: /*
1.1 cgd 1131: * Implement receive operations on a socket.
1132: * We depend on the way that records are added to the sockbuf
1133: * by sbappend*. In particular, each record (mbufs linked through m_next)
1134: * must begin with an address if the protocol so specifies,
1135: * followed by an optional mbuf or mbufs containing ancillary data,
1136: * and then zero or more mbufs of data.
1137: * In order to avoid blocking network interrupts for the entire time here,
1138: * we splx() while doing the actual copy to user space.
1139: * Although the sockbuf is locked, new data may still be appended,
1140: * and thus we must maintain consistency of the sockbuf during that time.
1141: *
1142: * The caller may receive the data as a single mbuf chain by supplying
1143: * an mbuf **mp0 for use in returning the chain. The uio is then used
1144: * only for the count in uio_resid.
1145: */
1.3 andrew 1146: int
1.54 lukem 1147: soreceive(struct socket *so, struct mbuf **paddr, struct uio *uio,
1148: struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
1.1 cgd 1149: {
1.116 yamt 1150: struct lwp *l = curlwp;
1.160 ad 1151: struct mbuf *m, **mp, *mt;
1.146 dyoung 1152: int atomic, flags, len, error, s, offset, moff, type, orig_resid;
1.99 matt 1153: const struct protosw *pr;
1.54 lukem 1154: struct mbuf *nextrecord;
1.67 he 1155: int mbuf_removed = 0;
1.146 dyoung 1156: const struct domain *dom;
1.196 dsl 1157: short wakeup_state = 0;
1.64 thorpej 1158:
1.54 lukem 1159: pr = so->so_proto;
1.146 dyoung 1160: atomic = pr->pr_flags & PR_ATOMIC;
1161: dom = pr->pr_domain;
1.1 cgd 1162: mp = mp0;
1.54 lukem 1163: type = 0;
1164: orig_resid = uio->uio_resid;
1.102 jonathan 1165:
1.144 dyoung 1166: if (paddr != NULL)
1167: *paddr = NULL;
1168: if (controlp != NULL)
1169: *controlp = NULL;
1170: if (flagsp != NULL)
1.1 cgd 1171: flags = *flagsp &~ MSG_EOR;
1172: else
1173: flags = 0;
1.66 enami 1174:
1.1 cgd 1175: if (flags & MSG_OOB) {
1176: m = m_get(M_WAIT, MT_DATA);
1.160 ad 1177: solock(so);
1.17 cgd 1178: error = (*pr->pr_usrreq)(so, PRU_RCVOOB, m,
1.140 dyoung 1179: (struct mbuf *)(long)(flags & MSG_PEEK), NULL, l);
1.160 ad 1180: sounlock(so);
1.1 cgd 1181: if (error)
1182: goto bad;
1183: do {
1.134 christos 1184: error = uiomove(mtod(m, void *),
1.1 cgd 1185: (int) min(uio->uio_resid, m->m_len), uio);
1186: m = m_free(m);
1.144 dyoung 1187: } while (uio->uio_resid > 0 && error == 0 && m);
1.54 lukem 1188: bad:
1.144 dyoung 1189: if (m != NULL)
1.1 cgd 1190: m_freem(m);
1.144 dyoung 1191: return error;
1.1 cgd 1192: }
1.144 dyoung 1193: if (mp != NULL)
1.140 dyoung 1194: *mp = NULL;
1.160 ad 1195:
1196: /*
1197: * solock() provides atomicity of access. splsoftnet() prevents
1198: * protocol processing soft interrupts from interrupting us and
1199: * blocking (expensive).
1200: */
1201: s = splsoftnet();
1202: solock(so);
1.1 cgd 1203: if (so->so_state & SS_ISCONFIRMING && uio->uio_resid)
1.140 dyoung 1204: (*pr->pr_usrreq)(so, PRU_RCVD, NULL, NULL, NULL, l);
1.1 cgd 1205:
1.54 lukem 1206: restart:
1.160 ad 1207: if ((error = sblock(&so->so_rcv, SBLOCKWAIT(flags))) != 0) {
1208: sounlock(so);
1209: splx(s);
1.144 dyoung 1210: return error;
1.160 ad 1211: }
1.1 cgd 1212:
1213: m = so->so_rcv.sb_mb;
1214: /*
1215: * If we have less data than requested, block awaiting more
1216: * (subject to any timeout) if:
1.15 mycroft 1217: * 1. the current count is less than the low water mark,
1.1 cgd 1218: * 2. MSG_WAITALL is set, and it is possible to do the entire
1.15 mycroft 1219: * receive operation at once if we block (resid <= hiwat), or
1220: * 3. MSG_DONTWAIT is not set.
1.1 cgd 1221: * If MSG_WAITALL is set but resid is larger than the receive buffer,
1222: * we have to do the receive in sections, and thus risk returning
1223: * a short count if a timeout or signal occurs after we start.
1224: */
1.144 dyoung 1225: if (m == NULL ||
1226: ((flags & MSG_DONTWAIT) == 0 &&
1227: so->so_rcv.sb_cc < uio->uio_resid &&
1228: (so->so_rcv.sb_cc < so->so_rcv.sb_lowat ||
1229: ((flags & MSG_WAITALL) &&
1230: uio->uio_resid <= so->so_rcv.sb_hiwat)) &&
1.146 dyoung 1231: m->m_nextpkt == NULL && !atomic)) {
1.1 cgd 1232: #ifdef DIAGNOSTIC
1.144 dyoung 1233: if (m == NULL && so->so_rcv.sb_cc)
1.1 cgd 1234: panic("receive 1");
1235: #endif
1236: if (so->so_error) {
1.144 dyoung 1237: if (m != NULL)
1.15 mycroft 1238: goto dontblock;
1.1 cgd 1239: error = so->so_error;
1240: if ((flags & MSG_PEEK) == 0)
1241: so->so_error = 0;
1242: goto release;
1243: }
1244: if (so->so_state & SS_CANTRCVMORE) {
1.144 dyoung 1245: if (m != NULL)
1.15 mycroft 1246: goto dontblock;
1.1 cgd 1247: else
1248: goto release;
1249: }
1.144 dyoung 1250: for (; m != NULL; m = m->m_next)
1.1 cgd 1251: if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) {
1252: m = so->so_rcv.sb_mb;
1253: goto dontblock;
1254: }
1255: if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
1256: (so->so_proto->pr_flags & PR_CONNREQUIRED)) {
1257: error = ENOTCONN;
1258: goto release;
1259: }
1260: if (uio->uio_resid == 0)
1261: goto release;
1.206 christos 1262: if ((so->so_state & SS_NBIO) ||
1263: (flags & (MSG_DONTWAIT|MSG_NBIO))) {
1.1 cgd 1264: error = EWOULDBLOCK;
1265: goto release;
1266: }
1.69 thorpej 1267: SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 1");
1268: SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 1");
1.1 cgd 1269: sbunlock(&so->so_rcv);
1.196 dsl 1270: if (wakeup_state & SS_RESTARTSYS)
1271: error = ERESTART;
1272: else
1273: error = sbwait(&so->so_rcv);
1.160 ad 1274: if (error != 0) {
1275: sounlock(so);
1276: splx(s);
1.144 dyoung 1277: return error;
1.160 ad 1278: }
1.196 dsl 1279: wakeup_state = so->so_state;
1.1 cgd 1280: goto restart;
1281: }
1.54 lukem 1282: dontblock:
1.69 thorpej 1283: /*
1284: * On entry here, m points to the first record of the socket buffer.
1.159 ad 1285: * From this point onward, we maintain 'nextrecord' as a cache of the
1286: * pointer to the next record in the socket buffer. We must keep the
1287: * various socket buffer pointers and local stack versions of the
1288: * pointers in sync, pushing out modifications before dropping the
1.160 ad 1289: * socket lock, and re-reading them when picking it up.
1.159 ad 1290: *
1291: * Otherwise, we will race with the network stack appending new data
1292: * or records onto the socket buffer by using inconsistent/stale
1293: * versions of the field, possibly resulting in socket buffer
1294: * corruption.
1295: *
1296: * By holding the high-level sblock(), we prevent simultaneous
1297: * readers from pulling off the front of the socket buffer.
1.69 thorpej 1298: */
1.144 dyoung 1299: if (l != NULL)
1.157 ad 1300: l->l_ru.ru_msgrcv++;
1.69 thorpej 1301: KASSERT(m == so->so_rcv.sb_mb);
1302: SBLASTRECORDCHK(&so->so_rcv, "soreceive 1");
1303: SBLASTMBUFCHK(&so->so_rcv, "soreceive 1");
1.1 cgd 1304: nextrecord = m->m_nextpkt;
1305: if (pr->pr_flags & PR_ADDR) {
1306: #ifdef DIAGNOSTIC
1307: if (m->m_type != MT_SONAME)
1308: panic("receive 1a");
1309: #endif
1.3 andrew 1310: orig_resid = 0;
1.1 cgd 1311: if (flags & MSG_PEEK) {
1312: if (paddr)
1313: *paddr = m_copy(m, 0, m->m_len);
1314: m = m->m_next;
1315: } else {
1316: sbfree(&so->so_rcv, m);
1.67 he 1317: mbuf_removed = 1;
1.144 dyoung 1318: if (paddr != NULL) {
1.1 cgd 1319: *paddr = m;
1320: so->so_rcv.sb_mb = m->m_next;
1.144 dyoung 1321: m->m_next = NULL;
1.1 cgd 1322: m = so->so_rcv.sb_mb;
1323: } else {
1324: MFREE(m, so->so_rcv.sb_mb);
1325: m = so->so_rcv.sb_mb;
1326: }
1.159 ad 1327: sbsync(&so->so_rcv, nextrecord);
1.1 cgd 1328: }
1329: }
1.159 ad 1330:
1331: /*
1332: * Process one or more MT_CONTROL mbufs present before any data mbufs
1333: * in the first mbuf chain on the socket buffer. If MSG_PEEK, we
1334: * just copy the data; if !MSG_PEEK, we call into the protocol to
1335: * perform externalization (or freeing if controlp == NULL).
1336: */
1337: if (__predict_false(m != NULL && m->m_type == MT_CONTROL)) {
1338: struct mbuf *cm = NULL, *cmn;
1339: struct mbuf **cme = &cm;
1340:
1341: do {
1342: if (flags & MSG_PEEK) {
1343: if (controlp != NULL) {
1344: *controlp = m_copy(m, 0, m->m_len);
1345: controlp = &(*controlp)->m_next;
1346: }
1347: m = m->m_next;
1348: } else {
1349: sbfree(&so->so_rcv, m);
1.1 cgd 1350: so->so_rcv.sb_mb = m->m_next;
1.144 dyoung 1351: m->m_next = NULL;
1.159 ad 1352: *cme = m;
1353: cme = &(*cme)->m_next;
1.1 cgd 1354: m = so->so_rcv.sb_mb;
1.159 ad 1355: }
1356: } while (m != NULL && m->m_type == MT_CONTROL);
1357: if ((flags & MSG_PEEK) == 0)
1358: sbsync(&so->so_rcv, nextrecord);
1359: for (; cm != NULL; cm = cmn) {
1360: cmn = cm->m_next;
1361: cm->m_next = NULL;
1362: type = mtod(cm, struct cmsghdr *)->cmsg_type;
1363: if (controlp != NULL) {
1364: if (dom->dom_externalize != NULL &&
1365: type == SCM_RIGHTS) {
1.160 ad 1366: sounlock(so);
1.159 ad 1367: splx(s);
1.204 christos 1368: error = (*dom->dom_externalize)(cm, l,
1369: (flags & MSG_CMSG_CLOEXEC) ?
1370: O_CLOEXEC : 0);
1.159 ad 1371: s = splsoftnet();
1.160 ad 1372: solock(so);
1.159 ad 1373: }
1374: *controlp = cm;
1375: while (*controlp != NULL)
1376: controlp = &(*controlp)->m_next;
1.1 cgd 1377: } else {
1.106 itojun 1378: /*
1379: * Dispose of any SCM_RIGHTS message that went
1380: * through the read path rather than recv.
1381: */
1.159 ad 1382: if (dom->dom_dispose != NULL &&
1383: type == SCM_RIGHTS) {
1.160 ad 1384: sounlock(so);
1.159 ad 1385: (*dom->dom_dispose)(cm);
1.160 ad 1386: solock(so);
1.159 ad 1387: }
1388: m_freem(cm);
1.1 cgd 1389: }
1390: }
1.159 ad 1391: if (m != NULL)
1392: nextrecord = so->so_rcv.sb_mb->m_nextpkt;
1393: else
1394: nextrecord = so->so_rcv.sb_mb;
1395: orig_resid = 0;
1.1 cgd 1396: }
1.69 thorpej 1397:
1.159 ad 1398: /* If m is non-NULL, we have some data to read. */
1399: if (__predict_true(m != NULL)) {
1.1 cgd 1400: type = m->m_type;
1401: if (type == MT_OOBDATA)
1402: flags |= MSG_OOB;
1403: }
1.69 thorpej 1404: SBLASTRECORDCHK(&so->so_rcv, "soreceive 2");
1405: SBLASTMBUFCHK(&so->so_rcv, "soreceive 2");
1406:
1.1 cgd 1407: moff = 0;
1408: offset = 0;
1.144 dyoung 1409: while (m != NULL && uio->uio_resid > 0 && error == 0) {
1.1 cgd 1410: if (m->m_type == MT_OOBDATA) {
1411: if (type != MT_OOBDATA)
1412: break;
1413: } else if (type == MT_OOBDATA)
1414: break;
1415: #ifdef DIAGNOSTIC
1416: else if (m->m_type != MT_DATA && m->m_type != MT_HEADER)
1417: panic("receive 3");
1418: #endif
1419: so->so_state &= ~SS_RCVATMARK;
1.196 dsl 1420: wakeup_state = 0;
1.1 cgd 1421: len = uio->uio_resid;
1422: if (so->so_oobmark && len > so->so_oobmark - offset)
1423: len = so->so_oobmark - offset;
1424: if (len > m->m_len - moff)
1425: len = m->m_len - moff;
1426: /*
1427: * If mp is set, just pass back the mbufs.
1428: * Otherwise copy them out via the uio, then free.
1429: * Sockbuf must be consistent here (points to current mbuf,
1430: * it points to next record) when we drop priority;
1431: * we must note any additions to the sockbuf when we
1432: * block interrupts again.
1433: */
1.144 dyoung 1434: if (mp == NULL) {
1.69 thorpej 1435: SBLASTRECORDCHK(&so->so_rcv, "soreceive uiomove");
1436: SBLASTMBUFCHK(&so->so_rcv, "soreceive uiomove");
1.160 ad 1437: sounlock(so);
1.1 cgd 1438: splx(s);
1.134 christos 1439: error = uiomove(mtod(m, char *) + moff, (int)len, uio);
1.20 mycroft 1440: s = splsoftnet();
1.160 ad 1441: solock(so);
1.144 dyoung 1442: if (error != 0) {
1.67 he 1443: /*
1444: * If any part of the record has been removed
1445: * (such as the MT_SONAME mbuf, which will
1446: * happen when PR_ADDR, and thus also
1447: * PR_ATOMIC, is set), then drop the entire
1448: * record to maintain the atomicity of the
1449: * receive operation.
1450: *
1451: * This avoids a later panic("receive 1a")
1452: * when compiled with DIAGNOSTIC.
1453: */
1.146 dyoung 1454: if (m && mbuf_removed && atomic)
1.67 he 1455: (void) sbdroprecord(&so->so_rcv);
1456:
1.57 jdolecek 1457: goto release;
1.67 he 1458: }
1.1 cgd 1459: } else
1460: uio->uio_resid -= len;
1461: if (len == m->m_len - moff) {
1462: if (m->m_flags & M_EOR)
1463: flags |= MSG_EOR;
1464: if (flags & MSG_PEEK) {
1465: m = m->m_next;
1466: moff = 0;
1467: } else {
1468: nextrecord = m->m_nextpkt;
1469: sbfree(&so->so_rcv, m);
1470: if (mp) {
1471: *mp = m;
1472: mp = &m->m_next;
1473: so->so_rcv.sb_mb = m = m->m_next;
1.140 dyoung 1474: *mp = NULL;
1.1 cgd 1475: } else {
1476: MFREE(m, so->so_rcv.sb_mb);
1477: m = so->so_rcv.sb_mb;
1478: }
1.69 thorpej 1479: /*
1480: * If m != NULL, we also know that
1481: * so->so_rcv.sb_mb != NULL.
1482: */
1483: KASSERT(so->so_rcv.sb_mb == m);
1484: if (m) {
1.1 cgd 1485: m->m_nextpkt = nextrecord;
1.69 thorpej 1486: if (nextrecord == NULL)
1487: so->so_rcv.sb_lastrecord = m;
1488: } else {
1489: so->so_rcv.sb_mb = nextrecord;
1.70 thorpej 1490: SB_EMPTY_FIXUP(&so->so_rcv);
1.69 thorpej 1491: }
1492: SBLASTRECORDCHK(&so->so_rcv, "soreceive 3");
1493: SBLASTMBUFCHK(&so->so_rcv, "soreceive 3");
1.1 cgd 1494: }
1.144 dyoung 1495: } else if (flags & MSG_PEEK)
1496: moff += len;
1497: else {
1.160 ad 1498: if (mp != NULL) {
1499: mt = m_copym(m, 0, len, M_NOWAIT);
1500: if (__predict_false(mt == NULL)) {
1501: sounlock(so);
1502: mt = m_copym(m, 0, len, M_WAIT);
1503: solock(so);
1504: }
1505: *mp = mt;
1506: }
1.144 dyoung 1507: m->m_data += len;
1508: m->m_len -= len;
1509: so->so_rcv.sb_cc -= len;
1.1 cgd 1510: }
1511: if (so->so_oobmark) {
1512: if ((flags & MSG_PEEK) == 0) {
1513: so->so_oobmark -= len;
1514: if (so->so_oobmark == 0) {
1515: so->so_state |= SS_RCVATMARK;
1516: break;
1517: }
1.7 cgd 1518: } else {
1.1 cgd 1519: offset += len;
1.7 cgd 1520: if (offset == so->so_oobmark)
1521: break;
1522: }
1.1 cgd 1523: }
1524: if (flags & MSG_EOR)
1525: break;
1526: /*
1527: * If the MSG_WAITALL flag is set (for non-atomic socket),
1528: * we must not quit until "uio->uio_resid == 0" or an error
1529: * termination. If a signal/timeout occurs, return
1530: * with a short count but without error.
1531: * Keep sockbuf locked against other readers.
1532: */
1.144 dyoung 1533: while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 &&
1.3 andrew 1534: !sosendallatonce(so) && !nextrecord) {
1.1 cgd 1535: if (so->so_error || so->so_state & SS_CANTRCVMORE)
1536: break;
1.68 matt 1537: /*
1538: * If we are peeking and the socket receive buffer is
1539: * full, stop since we can't get more data to peek at.
1540: */
1541: if ((flags & MSG_PEEK) && sbspace(&so->so_rcv) <= 0)
1542: break;
1543: /*
1544: * If we've drained the socket buffer, tell the
1545: * protocol in case it needs to do something to
1546: * get it filled again.
1547: */
1548: if ((pr->pr_flags & PR_WANTRCVD) && so->so_pcb)
1549: (*pr->pr_usrreq)(so, PRU_RCVD,
1.140 dyoung 1550: NULL, (struct mbuf *)(long)flags, NULL, l);
1.69 thorpej 1551: SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 2");
1552: SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 2");
1.196 dsl 1553: if (wakeup_state & SS_RESTARTSYS)
1554: error = ERESTART;
1555: else
1556: error = sbwait(&so->so_rcv);
1.144 dyoung 1557: if (error != 0) {
1.1 cgd 1558: sbunlock(&so->so_rcv);
1.160 ad 1559: sounlock(so);
1.1 cgd 1560: splx(s);
1.144 dyoung 1561: return 0;
1.1 cgd 1562: }
1.21 christos 1563: if ((m = so->so_rcv.sb_mb) != NULL)
1.1 cgd 1564: nextrecord = m->m_nextpkt;
1.196 dsl 1565: wakeup_state = so->so_state;
1.1 cgd 1566: }
1567: }
1.3 andrew 1568:
1.146 dyoung 1569: if (m && atomic) {
1.3 andrew 1570: flags |= MSG_TRUNC;
1571: if ((flags & MSG_PEEK) == 0)
1572: (void) sbdroprecord(&so->so_rcv);
1573: }
1.1 cgd 1574: if ((flags & MSG_PEEK) == 0) {
1.144 dyoung 1575: if (m == NULL) {
1.69 thorpej 1576: /*
1.70 thorpej 1577: * First part is an inline SB_EMPTY_FIXUP(). Second
1.69 thorpej 1578: * part makes sure sb_lastrecord is up-to-date if
1579: * there is still data in the socket buffer.
1580: */
1.1 cgd 1581: so->so_rcv.sb_mb = nextrecord;
1.69 thorpej 1582: if (so->so_rcv.sb_mb == NULL) {
1583: so->so_rcv.sb_mbtail = NULL;
1584: so->so_rcv.sb_lastrecord = NULL;
1585: } else if (nextrecord->m_nextpkt == NULL)
1586: so->so_rcv.sb_lastrecord = nextrecord;
1587: }
1588: SBLASTRECORDCHK(&so->so_rcv, "soreceive 4");
1589: SBLASTMBUFCHK(&so->so_rcv, "soreceive 4");
1.1 cgd 1590: if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
1.140 dyoung 1591: (*pr->pr_usrreq)(so, PRU_RCVD, NULL,
1592: (struct mbuf *)(long)flags, NULL, l);
1.1 cgd 1593: }
1.3 andrew 1594: if (orig_resid == uio->uio_resid && orig_resid &&
1595: (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) {
1596: sbunlock(&so->so_rcv);
1597: goto restart;
1598: }
1.108 perry 1599:
1.144 dyoung 1600: if (flagsp != NULL)
1.1 cgd 1601: *flagsp |= flags;
1.54 lukem 1602: release:
1.1 cgd 1603: sbunlock(&so->so_rcv);
1.160 ad 1604: sounlock(so);
1.1 cgd 1605: splx(s);
1.144 dyoung 1606: return error;
1.1 cgd 1607: }
1608:
1.14 mycroft 1609: int
1.54 lukem 1610: soshutdown(struct socket *so, int how)
1.1 cgd 1611: {
1.99 matt 1612: const struct protosw *pr;
1.160 ad 1613: int error;
1614:
1615: KASSERT(solocked(so));
1.34 kleink 1616:
1.54 lukem 1617: pr = so->so_proto;
1.34 kleink 1618: if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR))
1619: return (EINVAL);
1.1 cgd 1620:
1.160 ad 1621: if (how == SHUT_RD || how == SHUT_RDWR) {
1.1 cgd 1622: sorflush(so);
1.160 ad 1623: error = 0;
1624: }
1.34 kleink 1625: if (how == SHUT_WR || how == SHUT_RDWR)
1.160 ad 1626: error = (*pr->pr_usrreq)(so, PRU_SHUTDOWN, NULL,
1.140 dyoung 1627: NULL, NULL, NULL);
1.160 ad 1628:
1629: return error;
1.1 cgd 1630: }
1631:
1.195 dsl 1632: void
1.196 dsl 1633: sorestart(struct socket *so)
1.188 ad 1634: {
1.196 dsl 1635: /*
1636: * An application has called close() on an fd on which another
1637: * of its threads has called a socket system call.
1638: * Mark this and wake everyone up, and code that would block again
1639: * instead returns ERESTART.
1640: * On system call re-entry the fd is validated and EBADF returned.
1641: * Any other fd will block again on the 2nd syscall.
1642: */
1.188 ad 1643: solock(so);
1.196 dsl 1644: so->so_state |= SS_RESTARTSYS;
1.188 ad 1645: cv_broadcast(&so->so_cv);
1.196 dsl 1646: cv_broadcast(&so->so_snd.sb_cv);
1647: cv_broadcast(&so->so_rcv.sb_cv);
1.188 ad 1648: sounlock(so);
1649: }
1650:
1.14 mycroft 1651: void
1.54 lukem 1652: sorflush(struct socket *so)
1.1 cgd 1653: {
1.54 lukem 1654: struct sockbuf *sb, asb;
1.99 matt 1655: const struct protosw *pr;
1.160 ad 1656:
1657: KASSERT(solocked(so));
1.1 cgd 1658:
1.54 lukem 1659: sb = &so->so_rcv;
1660: pr = so->so_proto;
1.160 ad 1661: socantrcvmore(so);
1.1 cgd 1662: sb->sb_flags |= SB_NOINTR;
1.160 ad 1663: (void )sblock(sb, M_WAITOK);
1.1 cgd 1664: sbunlock(sb);
1665: asb = *sb;
1.86 wrstuden 1666: /*
1667: * Clear most of the sockbuf structure, but leave some of the
1668: * fields valid.
1669: */
1670: memset(&sb->sb_startzero, 0,
1671: sizeof(*sb) - offsetof(struct sockbuf, sb_startzero));
1.160 ad 1672: if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose) {
1673: sounlock(so);
1.1 cgd 1674: (*pr->pr_domain->dom_dispose)(asb.sb_mb);
1.160 ad 1675: solock(so);
1676: }
1.98 christos 1677: sbrelease(&asb, so);
1.1 cgd 1678: }
1679:
1.171 plunky 1680: /*
1681: * internal set SOL_SOCKET options
1682: */
1.142 dyoung 1683: static int
1.171 plunky 1684: sosetopt1(struct socket *so, const struct sockopt *sopt)
1.1 cgd 1685: {
1.182 christos 1686: int error = EINVAL, optval, opt;
1.171 plunky 1687: struct linger l;
1688: struct timeval tv;
1.142 dyoung 1689:
1.179 christos 1690: switch ((opt = sopt->sopt_name)) {
1.142 dyoung 1691:
1.170 tls 1692: case SO_ACCEPTFILTER:
1.177 ad 1693: error = accept_filt_setopt(so, sopt);
1694: KASSERT(solocked(so));
1.170 tls 1695: break;
1696:
1.171 plunky 1697: case SO_LINGER:
1698: error = sockopt_get(sopt, &l, sizeof(l));
1.177 ad 1699: solock(so);
1.171 plunky 1700: if (error)
1.177 ad 1701: break;
1.171 plunky 1702: if (l.l_linger < 0 || l.l_linger > USHRT_MAX ||
1.177 ad 1703: l.l_linger > (INT_MAX / hz)) {
1704: error = EDOM;
1705: break;
1706: }
1.171 plunky 1707: so->so_linger = l.l_linger;
1708: if (l.l_onoff)
1709: so->so_options |= SO_LINGER;
1710: else
1711: so->so_options &= ~SO_LINGER;
1.177 ad 1712: break;
1.1 cgd 1713:
1.142 dyoung 1714: case SO_DEBUG:
1715: case SO_KEEPALIVE:
1716: case SO_DONTROUTE:
1717: case SO_USELOOPBACK:
1718: case SO_BROADCAST:
1719: case SO_REUSEADDR:
1720: case SO_REUSEPORT:
1721: case SO_OOBINLINE:
1722: case SO_TIMESTAMP:
1.207 ! christos 1723: case SO_NOSIGPIPE:
1.184 christos 1724: #ifdef SO_OTIMESTAMP
1725: case SO_OTIMESTAMP:
1726: #endif
1.171 plunky 1727: error = sockopt_getint(sopt, &optval);
1.177 ad 1728: solock(so);
1.171 plunky 1729: if (error)
1.177 ad 1730: break;
1.171 plunky 1731: if (optval)
1.179 christos 1732: so->so_options |= opt;
1.142 dyoung 1733: else
1.179 christos 1734: so->so_options &= ~opt;
1.142 dyoung 1735: break;
1736:
1737: case SO_SNDBUF:
1738: case SO_RCVBUF:
1739: case SO_SNDLOWAT:
1740: case SO_RCVLOWAT:
1.171 plunky 1741: error = sockopt_getint(sopt, &optval);
1.177 ad 1742: solock(so);
1.171 plunky 1743: if (error)
1.177 ad 1744: break;
1.1 cgd 1745:
1.142 dyoung 1746: /*
1747: * Values < 1 make no sense for any of these
1748: * options, so disallow them.
1749: */
1.177 ad 1750: if (optval < 1) {
1751: error = EINVAL;
1752: break;
1753: }
1.1 cgd 1754:
1.179 christos 1755: switch (opt) {
1.171 plunky 1756: case SO_SNDBUF:
1.177 ad 1757: if (sbreserve(&so->so_snd, (u_long)optval, so) == 0) {
1758: error = ENOBUFS;
1759: break;
1760: }
1.171 plunky 1761: so->so_snd.sb_flags &= ~SB_AUTOSIZE;
1762: break;
1.1 cgd 1763:
1764: case SO_RCVBUF:
1.177 ad 1765: if (sbreserve(&so->so_rcv, (u_long)optval, so) == 0) {
1766: error = ENOBUFS;
1767: break;
1768: }
1.171 plunky 1769: so->so_rcv.sb_flags &= ~SB_AUTOSIZE;
1.142 dyoung 1770: break;
1771:
1772: /*
1773: * Make sure the low-water is never greater than
1774: * the high-water.
1775: */
1.1 cgd 1776: case SO_SNDLOWAT:
1.171 plunky 1777: if (optval > so->so_snd.sb_hiwat)
1778: optval = so->so_snd.sb_hiwat;
1779:
1780: so->so_snd.sb_lowat = optval;
1.142 dyoung 1781: break;
1.171 plunky 1782:
1.1 cgd 1783: case SO_RCVLOWAT:
1.171 plunky 1784: if (optval > so->so_rcv.sb_hiwat)
1785: optval = so->so_rcv.sb_hiwat;
1786:
1787: so->so_rcv.sb_lowat = optval;
1.142 dyoung 1788: break;
1789: }
1790: break;
1.28 thorpej 1791:
1.179 christos 1792: #ifdef COMPAT_50
1793: case SO_OSNDTIMEO:
1794: case SO_ORCVTIMEO: {
1795: struct timeval50 otv;
1796: error = sockopt_get(sopt, &otv, sizeof(otv));
1.186 pooka 1797: if (error) {
1798: solock(so);
1.183 christos 1799: break;
1.186 pooka 1800: }
1.179 christos 1801: timeval50_to_timeval(&otv, &tv);
1802: opt = opt == SO_OSNDTIMEO ? SO_SNDTIMEO : SO_RCVTIMEO;
1.182 christos 1803: error = 0;
1.179 christos 1804: /*FALLTHROUGH*/
1805: }
1806: #endif /* COMPAT_50 */
1807:
1.142 dyoung 1808: case SO_SNDTIMEO:
1809: case SO_RCVTIMEO:
1.182 christos 1810: if (error)
1.179 christos 1811: error = sockopt_get(sopt, &tv, sizeof(tv));
1.177 ad 1812: solock(so);
1.171 plunky 1813: if (error)
1.177 ad 1814: break;
1.171 plunky 1815:
1.177 ad 1816: if (tv.tv_sec > (INT_MAX - tv.tv_usec / tick) / hz) {
1817: error = EDOM;
1818: break;
1819: }
1.28 thorpej 1820:
1.171 plunky 1821: optval = tv.tv_sec * hz + tv.tv_usec / tick;
1822: if (optval == 0 && tv.tv_usec != 0)
1823: optval = 1;
1.28 thorpej 1824:
1.179 christos 1825: switch (opt) {
1.142 dyoung 1826: case SO_SNDTIMEO:
1.171 plunky 1827: so->so_snd.sb_timeo = optval;
1.1 cgd 1828: break;
1829: case SO_RCVTIMEO:
1.171 plunky 1830: so->so_rcv.sb_timeo = optval;
1.142 dyoung 1831: break;
1832: }
1833: break;
1.1 cgd 1834:
1.142 dyoung 1835: default:
1.177 ad 1836: solock(so);
1837: error = ENOPROTOOPT;
1838: break;
1.142 dyoung 1839: }
1.177 ad 1840: KASSERT(solocked(so));
1841: return error;
1.142 dyoung 1842: }
1.1 cgd 1843:
1.142 dyoung 1844: int
1.171 plunky 1845: sosetopt(struct socket *so, struct sockopt *sopt)
1.142 dyoung 1846: {
1847: int error, prerr;
1.1 cgd 1848:
1.177 ad 1849: if (sopt->sopt_level == SOL_SOCKET) {
1.171 plunky 1850: error = sosetopt1(so, sopt);
1.177 ad 1851: KASSERT(solocked(so));
1852: } else {
1.142 dyoung 1853: error = ENOPROTOOPT;
1.177 ad 1854: solock(so);
1855: }
1.1 cgd 1856:
1.142 dyoung 1857: if ((error == 0 || error == ENOPROTOOPT) &&
1858: so->so_proto != NULL && so->so_proto->pr_ctloutput != NULL) {
1859: /* give the protocol stack a shot */
1.171 plunky 1860: prerr = (*so->so_proto->pr_ctloutput)(PRCO_SETOPT, so, sopt);
1.142 dyoung 1861: if (prerr == 0)
1862: error = 0;
1863: else if (prerr != ENOPROTOOPT)
1864: error = prerr;
1.171 plunky 1865: }
1.160 ad 1866: sounlock(so);
1.142 dyoung 1867: return error;
1.1 cgd 1868: }
1869:
1.171 plunky 1870: /*
1871: * so_setsockopt() is a wrapper providing a sockopt structure for sosetopt()
1872: */
1873: int
1874: so_setsockopt(struct lwp *l, struct socket *so, int level, int name,
1875: const void *val, size_t valsize)
1876: {
1877: struct sockopt sopt;
1878: int error;
1879:
1880: KASSERT(valsize == 0 || val != NULL);
1881:
1882: sockopt_init(&sopt, level, name, valsize);
1883: sockopt_set(&sopt, val, valsize);
1884:
1885: error = sosetopt(so, &sopt);
1886:
1887: sockopt_destroy(&sopt);
1888:
1889: return error;
1890: }
1891:
1892: /*
1893: * internal get SOL_SOCKET options
1894: */
1895: static int
1896: sogetopt1(struct socket *so, struct sockopt *sopt)
1897: {
1.179 christos 1898: int error, optval, opt;
1.171 plunky 1899: struct linger l;
1900: struct timeval tv;
1901:
1.179 christos 1902: switch ((opt = sopt->sopt_name)) {
1.171 plunky 1903:
1904: case SO_ACCEPTFILTER:
1.177 ad 1905: error = accept_filt_getopt(so, sopt);
1.171 plunky 1906: break;
1907:
1908: case SO_LINGER:
1909: l.l_onoff = (so->so_options & SO_LINGER) ? 1 : 0;
1910: l.l_linger = so->so_linger;
1911:
1912: error = sockopt_set(sopt, &l, sizeof(l));
1913: break;
1914:
1915: case SO_USELOOPBACK:
1916: case SO_DONTROUTE:
1917: case SO_DEBUG:
1918: case SO_KEEPALIVE:
1919: case SO_REUSEADDR:
1920: case SO_REUSEPORT:
1921: case SO_BROADCAST:
1922: case SO_OOBINLINE:
1923: case SO_TIMESTAMP:
1.207 ! christos 1924: case SO_NOSIGPIPE:
1.184 christos 1925: #ifdef SO_OTIMESTAMP
1926: case SO_OTIMESTAMP:
1927: #endif
1.179 christos 1928: error = sockopt_setint(sopt, (so->so_options & opt) ? 1 : 0);
1.171 plunky 1929: break;
1930:
1931: case SO_TYPE:
1932: error = sockopt_setint(sopt, so->so_type);
1933: break;
1934:
1935: case SO_ERROR:
1936: error = sockopt_setint(sopt, so->so_error);
1937: so->so_error = 0;
1938: break;
1939:
1940: case SO_SNDBUF:
1941: error = sockopt_setint(sopt, so->so_snd.sb_hiwat);
1942: break;
1943:
1944: case SO_RCVBUF:
1945: error = sockopt_setint(sopt, so->so_rcv.sb_hiwat);
1946: break;
1947:
1948: case SO_SNDLOWAT:
1949: error = sockopt_setint(sopt, so->so_snd.sb_lowat);
1950: break;
1951:
1952: case SO_RCVLOWAT:
1953: error = sockopt_setint(sopt, so->so_rcv.sb_lowat);
1954: break;
1955:
1.179 christos 1956: #ifdef COMPAT_50
1957: case SO_OSNDTIMEO:
1958: case SO_ORCVTIMEO: {
1959: struct timeval50 otv;
1960:
1961: optval = (opt == SO_OSNDTIMEO ?
1962: so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
1963:
1964: otv.tv_sec = optval / hz;
1965: otv.tv_usec = (optval % hz) * tick;
1966:
1967: error = sockopt_set(sopt, &otv, sizeof(otv));
1968: break;
1969: }
1970: #endif /* COMPAT_50 */
1971:
1.171 plunky 1972: case SO_SNDTIMEO:
1973: case SO_RCVTIMEO:
1.179 christos 1974: optval = (opt == SO_SNDTIMEO ?
1.171 plunky 1975: so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
1976:
1977: tv.tv_sec = optval / hz;
1978: tv.tv_usec = (optval % hz) * tick;
1979:
1980: error = sockopt_set(sopt, &tv, sizeof(tv));
1981: break;
1982:
1983: case SO_OVERFLOWED:
1984: error = sockopt_setint(sopt, so->so_rcv.sb_overflowed);
1985: break;
1986:
1987: default:
1988: error = ENOPROTOOPT;
1989: break;
1990: }
1991:
1992: return (error);
1993: }
1994:
1.14 mycroft 1995: int
1.171 plunky 1996: sogetopt(struct socket *so, struct sockopt *sopt)
1.1 cgd 1997: {
1.160 ad 1998: int error;
1.1 cgd 1999:
1.160 ad 2000: solock(so);
1.171 plunky 2001: if (sopt->sopt_level != SOL_SOCKET) {
1.1 cgd 2002: if (so->so_proto && so->so_proto->pr_ctloutput) {
1.160 ad 2003: error = ((*so->so_proto->pr_ctloutput)
1.171 plunky 2004: (PRCO_GETOPT, so, sopt));
1.1 cgd 2005: } else
1.160 ad 2006: error = (ENOPROTOOPT);
1.1 cgd 2007: } else {
1.171 plunky 2008: error = sogetopt1(so, sopt);
2009: }
2010: sounlock(so);
2011: return (error);
2012: }
2013:
2014: /*
2015: * alloc sockopt data buffer buffer
2016: * - will be released at destroy
2017: */
1.176 plunky 2018: static int
2019: sockopt_alloc(struct sockopt *sopt, size_t len, km_flag_t kmflag)
1.171 plunky 2020: {
2021:
2022: KASSERT(sopt->sopt_size == 0);
2023:
1.176 plunky 2024: if (len > sizeof(sopt->sopt_buf)) {
2025: sopt->sopt_data = kmem_zalloc(len, kmflag);
2026: if (sopt->sopt_data == NULL)
2027: return ENOMEM;
2028: } else
1.171 plunky 2029: sopt->sopt_data = sopt->sopt_buf;
2030:
2031: sopt->sopt_size = len;
1.176 plunky 2032: return 0;
1.171 plunky 2033: }
2034:
2035: /*
2036: * initialise sockopt storage
1.176 plunky 2037: * - MAY sleep during allocation
1.171 plunky 2038: */
2039: void
2040: sockopt_init(struct sockopt *sopt, int level, int name, size_t size)
2041: {
1.1 cgd 2042:
1.171 plunky 2043: memset(sopt, 0, sizeof(*sopt));
1.1 cgd 2044:
1.171 plunky 2045: sopt->sopt_level = level;
2046: sopt->sopt_name = name;
1.176 plunky 2047: (void)sockopt_alloc(sopt, size, KM_SLEEP);
1.171 plunky 2048: }
2049:
2050: /*
2051: * destroy sockopt storage
2052: * - will release any held memory references
2053: */
2054: void
2055: sockopt_destroy(struct sockopt *sopt)
2056: {
2057:
2058: if (sopt->sopt_data != sopt->sopt_buf)
1.173 plunky 2059: kmem_free(sopt->sopt_data, sopt->sopt_size);
1.171 plunky 2060:
2061: memset(sopt, 0, sizeof(*sopt));
2062: }
2063:
2064: /*
2065: * set sockopt value
2066: * - value is copied into sockopt
1.176 plunky 2067: * - memory is allocated when necessary, will not sleep
1.171 plunky 2068: */
2069: int
2070: sockopt_set(struct sockopt *sopt, const void *buf, size_t len)
2071: {
1.176 plunky 2072: int error;
1.171 plunky 2073:
1.176 plunky 2074: if (sopt->sopt_size == 0) {
2075: error = sockopt_alloc(sopt, len, KM_NOSLEEP);
2076: if (error)
2077: return error;
2078: }
1.171 plunky 2079:
2080: KASSERT(sopt->sopt_size == len);
2081: memcpy(sopt->sopt_data, buf, len);
2082: return 0;
2083: }
2084:
2085: /*
2086: * common case of set sockopt integer value
2087: */
2088: int
2089: sockopt_setint(struct sockopt *sopt, int val)
2090: {
2091:
2092: return sockopt_set(sopt, &val, sizeof(int));
2093: }
2094:
2095: /*
2096: * get sockopt value
2097: * - correct size must be given
2098: */
2099: int
2100: sockopt_get(const struct sockopt *sopt, void *buf, size_t len)
2101: {
1.170 tls 2102:
1.171 plunky 2103: if (sopt->sopt_size != len)
2104: return EINVAL;
1.1 cgd 2105:
1.171 plunky 2106: memcpy(buf, sopt->sopt_data, len);
2107: return 0;
2108: }
1.1 cgd 2109:
1.171 plunky 2110: /*
2111: * common case of get sockopt integer value
2112: */
2113: int
2114: sockopt_getint(const struct sockopt *sopt, int *valp)
2115: {
1.1 cgd 2116:
1.171 plunky 2117: return sockopt_get(sopt, valp, sizeof(int));
2118: }
1.1 cgd 2119:
1.171 plunky 2120: /*
2121: * set sockopt value from mbuf
2122: * - ONLY for legacy code
2123: * - mbuf is released by sockopt
1.176 plunky 2124: * - will not sleep
1.171 plunky 2125: */
2126: int
2127: sockopt_setmbuf(struct sockopt *sopt, struct mbuf *m)
2128: {
2129: size_t len;
1.176 plunky 2130: int error;
1.1 cgd 2131:
1.171 plunky 2132: len = m_length(m);
1.1 cgd 2133:
1.176 plunky 2134: if (sopt->sopt_size == 0) {
2135: error = sockopt_alloc(sopt, len, KM_NOSLEEP);
2136: if (error)
2137: return error;
2138: }
1.1 cgd 2139:
1.171 plunky 2140: KASSERT(sopt->sopt_size == len);
2141: m_copydata(m, 0, len, sopt->sopt_data);
2142: m_freem(m);
1.1 cgd 2143:
1.171 plunky 2144: return 0;
2145: }
1.1 cgd 2146:
1.171 plunky 2147: /*
2148: * get sockopt value into mbuf
2149: * - ONLY for legacy code
2150: * - mbuf to be released by the caller
1.176 plunky 2151: * - will not sleep
1.171 plunky 2152: */
2153: struct mbuf *
2154: sockopt_getmbuf(const struct sockopt *sopt)
2155: {
2156: struct mbuf *m;
1.107 darrenr 2157:
1.176 plunky 2158: if (sopt->sopt_size > MCLBYTES)
2159: return NULL;
2160:
2161: m = m_get(M_DONTWAIT, MT_SOOPTS);
1.171 plunky 2162: if (m == NULL)
2163: return NULL;
2164:
1.176 plunky 2165: if (sopt->sopt_size > MLEN) {
2166: MCLGET(m, M_DONTWAIT);
2167: if ((m->m_flags & M_EXT) == 0) {
2168: m_free(m);
2169: return NULL;
2170: }
1.1 cgd 2171: }
1.176 plunky 2172:
2173: memcpy(mtod(m, void *), sopt->sopt_data, sopt->sopt_size);
2174: m->m_len = sopt->sopt_size;
1.160 ad 2175:
1.171 plunky 2176: return m;
1.1 cgd 2177: }
2178:
1.14 mycroft 2179: void
1.54 lukem 2180: sohasoutofband(struct socket *so)
1.1 cgd 2181: {
1.153 rmind 2182:
1.90 christos 2183: fownsignal(so->so_pgid, SIGURG, POLL_PRI, POLLPRI|POLLRDBAND, so);
1.189 ad 2184: selnotify(&so->so_rcv.sb_sel, POLLPRI | POLLRDBAND, NOTE_SUBMIT);
1.1 cgd 2185: }
1.72 jdolecek 2186:
2187: static void
2188: filt_sordetach(struct knote *kn)
2189: {
2190: struct socket *so;
2191:
1.155 ad 2192: so = ((file_t *)kn->kn_obj)->f_data;
1.160 ad 2193: solock(so);
1.73 christos 2194: SLIST_REMOVE(&so->so_rcv.sb_sel.sel_klist, kn, knote, kn_selnext);
2195: if (SLIST_EMPTY(&so->so_rcv.sb_sel.sel_klist))
1.72 jdolecek 2196: so->so_rcv.sb_flags &= ~SB_KNOTE;
1.160 ad 2197: sounlock(so);
1.72 jdolecek 2198: }
2199:
2200: /*ARGSUSED*/
2201: static int
1.129 yamt 2202: filt_soread(struct knote *kn, long hint)
1.72 jdolecek 2203: {
2204: struct socket *so;
1.160 ad 2205: int rv;
1.72 jdolecek 2206:
1.155 ad 2207: so = ((file_t *)kn->kn_obj)->f_data;
1.160 ad 2208: if (hint != NOTE_SUBMIT)
2209: solock(so);
1.72 jdolecek 2210: kn->kn_data = so->so_rcv.sb_cc;
2211: if (so->so_state & SS_CANTRCVMORE) {
1.108 perry 2212: kn->kn_flags |= EV_EOF;
1.72 jdolecek 2213: kn->kn_fflags = so->so_error;
1.160 ad 2214: rv = 1;
2215: } else if (so->so_error) /* temporary udp error */
2216: rv = 1;
2217: else if (kn->kn_sfflags & NOTE_LOWAT)
2218: rv = (kn->kn_data >= kn->kn_sdata);
2219: else
2220: rv = (kn->kn_data >= so->so_rcv.sb_lowat);
2221: if (hint != NOTE_SUBMIT)
2222: sounlock(so);
2223: return rv;
1.72 jdolecek 2224: }
2225:
2226: static void
2227: filt_sowdetach(struct knote *kn)
2228: {
2229: struct socket *so;
2230:
1.155 ad 2231: so = ((file_t *)kn->kn_obj)->f_data;
1.160 ad 2232: solock(so);
1.73 christos 2233: SLIST_REMOVE(&so->so_snd.sb_sel.sel_klist, kn, knote, kn_selnext);
2234: if (SLIST_EMPTY(&so->so_snd.sb_sel.sel_klist))
1.72 jdolecek 2235: so->so_snd.sb_flags &= ~SB_KNOTE;
1.160 ad 2236: sounlock(so);
1.72 jdolecek 2237: }
2238:
2239: /*ARGSUSED*/
2240: static int
1.129 yamt 2241: filt_sowrite(struct knote *kn, long hint)
1.72 jdolecek 2242: {
2243: struct socket *so;
1.160 ad 2244: int rv;
1.72 jdolecek 2245:
1.155 ad 2246: so = ((file_t *)kn->kn_obj)->f_data;
1.160 ad 2247: if (hint != NOTE_SUBMIT)
2248: solock(so);
1.72 jdolecek 2249: kn->kn_data = sbspace(&so->so_snd);
2250: if (so->so_state & SS_CANTSENDMORE) {
1.108 perry 2251: kn->kn_flags |= EV_EOF;
1.72 jdolecek 2252: kn->kn_fflags = so->so_error;
1.160 ad 2253: rv = 1;
2254: } else if (so->so_error) /* temporary udp error */
2255: rv = 1;
2256: else if (((so->so_state & SS_ISCONNECTED) == 0) &&
1.72 jdolecek 2257: (so->so_proto->pr_flags & PR_CONNREQUIRED))
1.160 ad 2258: rv = 0;
2259: else if (kn->kn_sfflags & NOTE_LOWAT)
2260: rv = (kn->kn_data >= kn->kn_sdata);
2261: else
2262: rv = (kn->kn_data >= so->so_snd.sb_lowat);
2263: if (hint != NOTE_SUBMIT)
2264: sounlock(so);
2265: return rv;
1.72 jdolecek 2266: }
2267:
2268: /*ARGSUSED*/
2269: static int
1.129 yamt 2270: filt_solisten(struct knote *kn, long hint)
1.72 jdolecek 2271: {
2272: struct socket *so;
1.160 ad 2273: int rv;
1.72 jdolecek 2274:
1.155 ad 2275: so = ((file_t *)kn->kn_obj)->f_data;
1.72 jdolecek 2276:
2277: /*
2278: * Set kn_data to number of incoming connections, not
2279: * counting partial (incomplete) connections.
1.108 perry 2280: */
1.160 ad 2281: if (hint != NOTE_SUBMIT)
2282: solock(so);
1.72 jdolecek 2283: kn->kn_data = so->so_qlen;
1.160 ad 2284: rv = (kn->kn_data > 0);
2285: if (hint != NOTE_SUBMIT)
2286: sounlock(so);
2287: return rv;
1.72 jdolecek 2288: }
2289:
2290: static const struct filterops solisten_filtops =
2291: { 1, NULL, filt_sordetach, filt_solisten };
2292: static const struct filterops soread_filtops =
2293: { 1, NULL, filt_sordetach, filt_soread };
2294: static const struct filterops sowrite_filtops =
2295: { 1, NULL, filt_sowdetach, filt_sowrite };
2296:
2297: int
1.129 yamt 2298: soo_kqfilter(struct file *fp, struct knote *kn)
1.72 jdolecek 2299: {
2300: struct socket *so;
2301: struct sockbuf *sb;
2302:
1.155 ad 2303: so = ((file_t *)kn->kn_obj)->f_data;
1.160 ad 2304: solock(so);
1.72 jdolecek 2305: switch (kn->kn_filter) {
2306: case EVFILT_READ:
2307: if (so->so_options & SO_ACCEPTCONN)
2308: kn->kn_fop = &solisten_filtops;
2309: else
2310: kn->kn_fop = &soread_filtops;
2311: sb = &so->so_rcv;
2312: break;
2313: case EVFILT_WRITE:
2314: kn->kn_fop = &sowrite_filtops;
2315: sb = &so->so_snd;
2316: break;
2317: default:
1.160 ad 2318: sounlock(so);
1.149 pooka 2319: return (EINVAL);
1.72 jdolecek 2320: }
1.73 christos 2321: SLIST_INSERT_HEAD(&sb->sb_sel.sel_klist, kn, kn_selnext);
1.72 jdolecek 2322: sb->sb_flags |= SB_KNOTE;
1.160 ad 2323: sounlock(so);
1.72 jdolecek 2324: return (0);
2325: }
2326:
1.154 ad 2327: static int
2328: sodopoll(struct socket *so, int events)
2329: {
2330: int revents;
2331:
2332: revents = 0;
2333:
2334: if (events & (POLLIN | POLLRDNORM))
2335: if (soreadable(so))
2336: revents |= events & (POLLIN | POLLRDNORM);
2337:
2338: if (events & (POLLOUT | POLLWRNORM))
2339: if (sowritable(so))
2340: revents |= events & (POLLOUT | POLLWRNORM);
2341:
2342: if (events & (POLLPRI | POLLRDBAND))
2343: if (so->so_oobmark || (so->so_state & SS_RCVATMARK))
2344: revents |= events & (POLLPRI | POLLRDBAND);
2345:
2346: return revents;
2347: }
2348:
2349: int
2350: sopoll(struct socket *so, int events)
2351: {
2352: int revents = 0;
2353:
1.160 ad 2354: #ifndef DIAGNOSTIC
2355: /*
2356: * Do a quick, unlocked check in expectation that the socket
2357: * will be ready for I/O. Don't do this check if DIAGNOSTIC,
2358: * as the solocked() assertions will fail.
2359: */
1.154 ad 2360: if ((revents = sodopoll(so, events)) != 0)
2361: return revents;
1.160 ad 2362: #endif
1.154 ad 2363:
1.160 ad 2364: solock(so);
1.154 ad 2365: if ((revents = sodopoll(so, events)) == 0) {
2366: if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
2367: selrecord(curlwp, &so->so_rcv.sb_sel);
1.160 ad 2368: so->so_rcv.sb_flags |= SB_NOTIFY;
1.154 ad 2369: }
2370:
2371: if (events & (POLLOUT | POLLWRNORM)) {
2372: selrecord(curlwp, &so->so_snd.sb_sel);
1.160 ad 2373: so->so_snd.sb_flags |= SB_NOTIFY;
1.154 ad 2374: }
2375: }
1.160 ad 2376: sounlock(so);
1.154 ad 2377:
2378: return revents;
2379: }
2380:
2381:
1.94 yamt 2382: #include <sys/sysctl.h>
2383:
2384: static int sysctl_kern_somaxkva(SYSCTLFN_PROTO);
2385:
2386: /*
2387: * sysctl helper routine for kern.somaxkva. ensures that the given
2388: * value is not too small.
2389: * (XXX should we maybe make sure it's not too large as well?)
2390: */
2391: static int
2392: sysctl_kern_somaxkva(SYSCTLFN_ARGS)
2393: {
2394: int error, new_somaxkva;
2395: struct sysctlnode node;
2396:
2397: new_somaxkva = somaxkva;
2398: node = *rnode;
2399: node.sysctl_data = &new_somaxkva;
2400: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2401: if (error || newp == NULL)
2402: return (error);
2403:
2404: if (new_somaxkva < (16 * 1024 * 1024)) /* sanity */
2405: return (EINVAL);
2406:
1.136 ad 2407: mutex_enter(&so_pendfree_lock);
1.94 yamt 2408: somaxkva = new_somaxkva;
1.136 ad 2409: cv_broadcast(&socurkva_cv);
2410: mutex_exit(&so_pendfree_lock);
1.94 yamt 2411:
2412: return (error);
2413: }
2414:
1.178 pooka 2415: static void
1.187 cegger 2416: sysctl_kern_somaxkva_setup(void)
1.94 yamt 2417: {
2418:
1.178 pooka 2419: KASSERT(socket_sysctllog == NULL);
2420: sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
1.97 atatat 2421: CTLFLAG_PERMANENT,
2422: CTLTYPE_NODE, "kern", NULL,
2423: NULL, 0, NULL, 0,
2424: CTL_KERN, CTL_EOL);
2425:
1.178 pooka 2426: sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
1.97 atatat 2427: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.103 atatat 2428: CTLTYPE_INT, "somaxkva",
2429: SYSCTL_DESCR("Maximum amount of kernel memory to be "
2430: "used for socket buffers"),
1.94 yamt 2431: sysctl_kern_somaxkva, 0, NULL, 0,
2432: CTL_KERN, KERN_SOMAXKVA, CTL_EOL);
2433: }
CVSweb <webmaster@jp.NetBSD.org>
![[BACK]](/icons/back.gif){kind=icon}
Return to uipc_socket.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [cvs.NetBSD.org] / src / sys / kern