Annotation of src/sys/kern/uipc_socket.c, Revision 1.235.2.2
1.235.2.2! skrll 1: /* $NetBSD: uipc_socket.c,v 1.235.2.1 2015/04/06 15:18:20 skrll 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:
1.222 rmind 65: /*
66: * Socket operation routines.
67: *
68: * These routines are called by the routines in sys_socket.c or from a
69: * system process, and implement the semantics of socket operations by
70: * switching out to the protocol specific routines.
71: */
72:
1.59 lukem 73: #include <sys/cdefs.h>
1.235.2.2! skrll 74: __KERNEL_RCSID(0, "$NetBSD: uipc_socket.c,v 1.235.2.1 2015/04/06 15:18:20 skrll Exp $");
1.64 thorpej 75:
1.179 christos 76: #include "opt_compat_netbsd.h"
1.64 thorpej 77: #include "opt_sock_counters.h"
78: #include "opt_sosend_loan.h"
1.81 martin 79: #include "opt_mbuftrace.h"
1.84 ragge 80: #include "opt_somaxkva.h"
1.167 ad 81: #include "opt_multiprocessor.h" /* XXX */
1.1 cgd 82:
1.9 mycroft 83: #include <sys/param.h>
84: #include <sys/systm.h>
85: #include <sys/proc.h>
86: #include <sys/file.h>
1.142 dyoung 87: #include <sys/filedesc.h>
1.173 plunky 88: #include <sys/kmem.h>
1.9 mycroft 89: #include <sys/mbuf.h>
90: #include <sys/domain.h>
91: #include <sys/kernel.h>
92: #include <sys/protosw.h>
93: #include <sys/socket.h>
94: #include <sys/socketvar.h>
1.21 christos 95: #include <sys/signalvar.h>
1.9 mycroft 96: #include <sys/resourcevar.h>
1.174 pooka 97: #include <sys/uidinfo.h>
1.72 jdolecek 98: #include <sys/event.h>
1.89 christos 99: #include <sys/poll.h>
1.118 elad 100: #include <sys/kauth.h>
1.136 ad 101: #include <sys/mutex.h>
102: #include <sys/condvar.h>
1.205 bouyer 103: #include <sys/kthread.h>
1.37 thorpej 104:
1.179 christos 105: #ifdef COMPAT_50
106: #include <compat/sys/time.h>
1.184 christos 107: #include <compat/sys/socket.h>
1.179 christos 108: #endif
109:
1.202 uebayasi 110: #include <uvm/uvm_extern.h>
111: #include <uvm/uvm_loan.h>
112: #include <uvm/uvm_page.h>
1.64 thorpej 113:
1.77 thorpej 114: MALLOC_DEFINE(M_SONAME, "soname", "socket name");
1.37 thorpej 115:
1.142 dyoung 116: extern const struct fileops socketops;
117:
1.54 lukem 118: extern int somaxconn; /* patchable (XXX sysctl) */
119: int somaxconn = SOMAXCONN;
1.160 ad 120: kmutex_t *softnet_lock;
1.49 jonathan 121:
1.64 thorpej 122: #ifdef SOSEND_COUNTERS
123: #include <sys/device.h>
124:
1.113 thorpej 125: static struct evcnt sosend_loan_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64 thorpej 126: NULL, "sosend", "loan big");
1.113 thorpej 127: static struct evcnt sosend_copy_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64 thorpej 128: NULL, "sosend", "copy big");
1.113 thorpej 129: static struct evcnt sosend_copy_small = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64 thorpej 130: NULL, "sosend", "copy small");
1.113 thorpej 131: static struct evcnt sosend_kvalimit = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64 thorpej 132: NULL, "sosend", "kva limit");
133:
134: #define SOSEND_COUNTER_INCR(ev) (ev)->ev_count++
135:
1.101 matt 136: EVCNT_ATTACH_STATIC(sosend_loan_big);
137: EVCNT_ATTACH_STATIC(sosend_copy_big);
138: EVCNT_ATTACH_STATIC(sosend_copy_small);
139: EVCNT_ATTACH_STATIC(sosend_kvalimit);
1.64 thorpej 140: #else
141:
142: #define SOSEND_COUNTER_INCR(ev) /* nothing */
143:
144: #endif /* SOSEND_COUNTERS */
145:
1.167 ad 146: #if defined(SOSEND_NO_LOAN) || defined(MULTIPROCESSOR)
1.121 yamt 147: int sock_loan_thresh = -1;
1.71 thorpej 148: #else
1.121 yamt 149: int sock_loan_thresh = 4096;
1.65 thorpej 150: #endif
1.64 thorpej 151:
1.136 ad 152: static kmutex_t so_pendfree_lock;
1.205 bouyer 153: static struct mbuf *so_pendfree = NULL;
1.64 thorpej 154:
1.84 ragge 155: #ifndef SOMAXKVA
156: #define SOMAXKVA (16 * 1024 * 1024)
157: #endif
158: int somaxkva = SOMAXKVA;
1.113 thorpej 159: static int socurkva;
1.136 ad 160: static kcondvar_t socurkva_cv;
1.64 thorpej 161:
1.191 elad 162: static kauth_listener_t socket_listener;
163:
1.64 thorpej 164: #define SOCK_LOAN_CHUNK 65536
165:
1.205 bouyer 166: static void sopendfree_thread(void *);
167: static kcondvar_t pendfree_thread_cv;
168: static lwp_t *sopendfree_lwp;
1.93 yamt 169:
1.212 pooka 170: static void sysctl_kern_socket_setup(void);
1.178 pooka 171: static struct sysctllog *socket_sysctllog;
172:
1.113 thorpej 173: static vsize_t
1.129 yamt 174: sokvareserve(struct socket *so, vsize_t len)
1.80 yamt 175: {
1.98 christos 176: int error;
1.80 yamt 177:
1.136 ad 178: mutex_enter(&so_pendfree_lock);
1.80 yamt 179: while (socurkva + len > somaxkva) {
180: SOSEND_COUNTER_INCR(&sosend_kvalimit);
1.136 ad 181: error = cv_wait_sig(&socurkva_cv, &so_pendfree_lock);
1.98 christos 182: if (error) {
183: len = 0;
184: break;
185: }
1.80 yamt 186: }
1.93 yamt 187: socurkva += len;
1.136 ad 188: mutex_exit(&so_pendfree_lock);
1.98 christos 189: return len;
1.95 yamt 190: }
191:
1.113 thorpej 192: static void
1.95 yamt 193: sokvaunreserve(vsize_t len)
194: {
195:
1.136 ad 196: mutex_enter(&so_pendfree_lock);
1.95 yamt 197: socurkva -= len;
1.136 ad 198: cv_broadcast(&socurkva_cv);
199: mutex_exit(&so_pendfree_lock);
1.95 yamt 200: }
201:
202: /*
203: * sokvaalloc: allocate kva for loan.
204: */
205:
206: vaddr_t
1.209 matt 207: sokvaalloc(vaddr_t sva, vsize_t len, struct socket *so)
1.95 yamt 208: {
209: vaddr_t lva;
210:
211: /*
212: * reserve kva.
213: */
214:
1.98 christos 215: if (sokvareserve(so, len) == 0)
216: return 0;
1.93 yamt 217:
218: /*
219: * allocate kva.
220: */
1.80 yamt 221:
1.209 matt 222: lva = uvm_km_alloc(kernel_map, len, atop(sva) & uvmexp.colormask,
223: UVM_KMF_COLORMATCH | UVM_KMF_VAONLY | UVM_KMF_WAITVA);
1.95 yamt 224: if (lva == 0) {
225: sokvaunreserve(len);
1.80 yamt 226: return (0);
1.95 yamt 227: }
1.80 yamt 228:
229: return lva;
230: }
231:
1.93 yamt 232: /*
233: * sokvafree: free kva for loan.
234: */
235:
1.80 yamt 236: void
237: sokvafree(vaddr_t sva, vsize_t len)
238: {
1.93 yamt 239:
240: /*
241: * free kva.
242: */
1.80 yamt 243:
1.109 yamt 244: uvm_km_free(kernel_map, sva, len, UVM_KMF_VAONLY);
1.93 yamt 245:
246: /*
247: * unreserve kva.
248: */
249:
1.95 yamt 250: sokvaunreserve(len);
1.80 yamt 251: }
252:
1.64 thorpej 253: static void
1.134 christos 254: sodoloanfree(struct vm_page **pgs, void *buf, size_t size)
1.64 thorpej 255: {
1.156 yamt 256: vaddr_t sva, eva;
1.64 thorpej 257: vsize_t len;
1.156 yamt 258: int npgs;
259:
260: KASSERT(pgs != NULL);
1.64 thorpej 261:
262: eva = round_page((vaddr_t) buf + size);
263: sva = trunc_page((vaddr_t) buf);
264: len = eva - sva;
265: npgs = len >> PAGE_SHIFT;
266:
267: pmap_kremove(sva, len);
268: pmap_update(pmap_kernel());
269: uvm_unloan(pgs, npgs, UVM_LOAN_TOPAGE);
1.80 yamt 270: sokvafree(sva, len);
1.64 thorpej 271: }
272:
1.93 yamt 273: /*
1.205 bouyer 274: * sopendfree_thread: free mbufs on "pendfree" list.
1.136 ad 275: * unlock and relock so_pendfree_lock when freeing mbufs.
1.93 yamt 276: */
277:
1.205 bouyer 278: static void
279: sopendfree_thread(void *v)
1.93 yamt 280: {
1.137 ad 281: struct mbuf *m, *next;
1.205 bouyer 282: size_t rv;
1.93 yamt 283:
1.205 bouyer 284: mutex_enter(&so_pendfree_lock);
1.64 thorpej 285:
1.205 bouyer 286: for (;;) {
287: rv = 0;
288: while (so_pendfree != NULL) {
289: m = so_pendfree;
290: so_pendfree = NULL;
291: mutex_exit(&so_pendfree_lock);
292:
293: for (; m != NULL; m = next) {
294: next = m->m_next;
295: KASSERT((~m->m_flags & (M_EXT|M_EXT_PAGES)) == 0);
296: KASSERT(m->m_ext.ext_refcnt == 0);
297:
298: rv += m->m_ext.ext_size;
299: sodoloanfree(m->m_ext.ext_pgs, m->m_ext.ext_buf,
300: m->m_ext.ext_size);
301: pool_cache_put(mb_cache, m);
302: }
1.93 yamt 303:
1.205 bouyer 304: mutex_enter(&so_pendfree_lock);
1.93 yamt 305: }
1.205 bouyer 306: if (rv)
307: cv_broadcast(&socurkva_cv);
308: cv_wait(&pendfree_thread_cv, &so_pendfree_lock);
1.64 thorpej 309: }
1.205 bouyer 310: panic("sopendfree_thread");
311: /* NOTREACHED */
1.64 thorpej 312: }
313:
1.80 yamt 314: void
1.134 christos 315: soloanfree(struct mbuf *m, void *buf, size_t size, void *arg)
1.64 thorpej 316: {
317:
1.156 yamt 318: KASSERT(m != NULL);
1.64 thorpej 319:
1.93 yamt 320: /*
321: * postpone freeing mbuf.
322: *
323: * we can't do it in interrupt context
324: * because we need to put kva back to kernel_map.
325: */
326:
1.136 ad 327: mutex_enter(&so_pendfree_lock);
1.92 yamt 328: m->m_next = so_pendfree;
329: so_pendfree = m;
1.205 bouyer 330: cv_signal(&pendfree_thread_cv);
1.136 ad 331: mutex_exit(&so_pendfree_lock);
1.64 thorpej 332: }
333:
334: static long
335: sosend_loan(struct socket *so, struct uio *uio, struct mbuf *m, long space)
336: {
337: struct iovec *iov = uio->uio_iov;
338: vaddr_t sva, eva;
339: vsize_t len;
1.156 yamt 340: vaddr_t lva;
341: int npgs, error;
342: vaddr_t va;
343: int i;
1.64 thorpej 344:
1.116 yamt 345: if (VMSPACE_IS_KERNEL_P(uio->uio_vmspace))
1.64 thorpej 346: return (0);
347:
348: if (iov->iov_len < (size_t) space)
349: space = iov->iov_len;
350: if (space > SOCK_LOAN_CHUNK)
351: space = SOCK_LOAN_CHUNK;
352:
353: eva = round_page((vaddr_t) iov->iov_base + space);
354: sva = trunc_page((vaddr_t) iov->iov_base);
355: len = eva - sva;
356: npgs = len >> PAGE_SHIFT;
357:
1.79 thorpej 358: KASSERT(npgs <= M_EXT_MAXPAGES);
359:
1.209 matt 360: lva = sokvaalloc(sva, len, so);
1.64 thorpej 361: if (lva == 0)
1.80 yamt 362: return 0;
1.64 thorpej 363:
1.116 yamt 364: error = uvm_loan(&uio->uio_vmspace->vm_map, sva, len,
1.79 thorpej 365: m->m_ext.ext_pgs, UVM_LOAN_TOPAGE);
1.64 thorpej 366: if (error) {
1.80 yamt 367: sokvafree(lva, len);
1.64 thorpej 368: return (0);
369: }
370:
371: for (i = 0, va = lva; i < npgs; i++, va += PAGE_SIZE)
1.79 thorpej 372: pmap_kenter_pa(va, VM_PAGE_TO_PHYS(m->m_ext.ext_pgs[i]),
1.194 cegger 373: VM_PROT_READ, 0);
1.64 thorpej 374: pmap_update(pmap_kernel());
375:
376: lva += (vaddr_t) iov->iov_base & PAGE_MASK;
377:
1.134 christos 378: MEXTADD(m, (void *) lva, space, M_MBUF, soloanfree, so);
1.79 thorpej 379: m->m_flags |= M_EXT_PAGES | M_EXT_ROMAP;
1.64 thorpej 380:
381: uio->uio_resid -= space;
382: /* uio_offset not updated, not set/used for write(2) */
1.134 christos 383: uio->uio_iov->iov_base = (char *)uio->uio_iov->iov_base + space;
1.64 thorpej 384: uio->uio_iov->iov_len -= space;
385: if (uio->uio_iov->iov_len == 0) {
386: uio->uio_iov++;
387: uio->uio_iovcnt--;
388: }
389:
390: return (space);
391: }
392:
1.142 dyoung 393: struct mbuf *
1.147 dyoung 394: getsombuf(struct socket *so, int type)
1.142 dyoung 395: {
396: struct mbuf *m;
397:
1.147 dyoung 398: m = m_get(M_WAIT, type);
1.142 dyoung 399: MCLAIM(m, so->so_mowner);
400: return m;
401: }
402:
1.191 elad 403: static int
404: socket_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie,
405: void *arg0, void *arg1, void *arg2, void *arg3)
406: {
407: int result;
408: enum kauth_network_req req;
409:
410: result = KAUTH_RESULT_DEFER;
411: req = (enum kauth_network_req)arg0;
412:
1.193 elad 413: if ((action != KAUTH_NETWORK_SOCKET) &&
414: (action != KAUTH_NETWORK_BIND))
1.191 elad 415: return result;
416:
417: switch (req) {
1.193 elad 418: case KAUTH_REQ_NETWORK_BIND_PORT:
419: result = KAUTH_RESULT_ALLOW;
420: break;
421:
1.191 elad 422: case KAUTH_REQ_NETWORK_SOCKET_DROP: {
423: /* Normal users can only drop their own connections. */
424: struct socket *so = (struct socket *)arg1;
425:
1.220 christos 426: if (so->so_cred && proc_uidmatch(cred, so->so_cred) == 0)
1.191 elad 427: result = KAUTH_RESULT_ALLOW;
428:
429: break;
430: }
431:
432: case KAUTH_REQ_NETWORK_SOCKET_OPEN:
433: /* We allow "raw" routing/bluetooth sockets to anyone. */
1.203 matt 434: if ((u_long)arg1 == PF_ROUTE || (u_long)arg1 == PF_OROUTE
435: || (u_long)arg1 == PF_BLUETOOTH) {
1.191 elad 436: result = KAUTH_RESULT_ALLOW;
1.203 matt 437: } else {
1.191 elad 438: /* Privileged, let secmodel handle this. */
439: if ((u_long)arg2 == SOCK_RAW)
440: break;
441: }
442:
443: result = KAUTH_RESULT_ALLOW;
444:
445: break;
446:
1.192 elad 447: case KAUTH_REQ_NETWORK_SOCKET_CANSEE:
448: result = KAUTH_RESULT_ALLOW;
449:
450: break;
451:
1.191 elad 452: default:
453: break;
454: }
455:
456: return result;
457: }
458:
1.119 yamt 459: void
460: soinit(void)
461: {
462:
1.212 pooka 463: sysctl_kern_socket_setup();
1.178 pooka 464:
1.148 ad 465: mutex_init(&so_pendfree_lock, MUTEX_DEFAULT, IPL_VM);
1.160 ad 466: softnet_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
1.136 ad 467: cv_init(&socurkva_cv, "sokva");
1.205 bouyer 468: cv_init(&pendfree_thread_cv, "sopendfr");
1.166 ad 469: soinit2();
1.136 ad 470:
1.119 yamt 471: /* Set the initial adjusted socket buffer size. */
472: if (sb_max_set(sb_max))
473: panic("bad initial sb_max value: %lu", sb_max);
474:
1.191 elad 475: socket_listener = kauth_listen_scope(KAUTH_SCOPE_NETWORK,
476: socket_listener_cb, NULL);
1.119 yamt 477: }
478:
1.205 bouyer 479: void
480: soinit1(void)
481: {
482: int error = kthread_create(PRI_NONE, KTHREAD_MPSAFE, NULL,
483: sopendfree_thread, NULL, &sopendfree_lwp, "sopendfree");
484: if (error)
485: panic("soinit1 %d", error);
486: }
487:
1.1 cgd 488: /*
1.222 rmind 489: * socreate: create a new socket of the specified type and the protocol.
490: *
491: * => Caller may specify another socket for lock sharing (must not be held).
492: * => Returns the new socket without lock held.
1.224 rmind 493: */
1.3 andrew 494: int
1.160 ad 495: socreate(int dom, struct socket **aso, int type, int proto, struct lwp *l,
496: struct socket *lockso)
1.1 cgd 497: {
1.99 matt 498: const struct protosw *prp;
1.54 lukem 499: struct socket *so;
1.115 yamt 500: uid_t uid;
1.160 ad 501: int error;
502: kmutex_t *lock;
1.1 cgd 503:
1.132 elad 504: error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_SOCKET,
505: KAUTH_REQ_NETWORK_SOCKET_OPEN, KAUTH_ARG(dom), KAUTH_ARG(type),
506: KAUTH_ARG(proto));
1.140 dyoung 507: if (error != 0)
508: return error;
1.127 elad 509:
1.1 cgd 510: if (proto)
511: prp = pffindproto(dom, proto, type);
512: else
513: prp = pffindtype(dom, type);
1.140 dyoung 514: if (prp == NULL) {
1.120 ginsbach 515: /* no support for domain */
516: if (pffinddomain(dom) == 0)
1.140 dyoung 517: return EAFNOSUPPORT;
1.120 ginsbach 518: /* no support for socket type */
519: if (proto == 0 && type != 0)
1.140 dyoung 520: return EPROTOTYPE;
521: return EPROTONOSUPPORT;
1.120 ginsbach 522: }
1.223 rmind 523: if (prp->pr_usrreqs == NULL)
1.140 dyoung 524: return EPROTONOSUPPORT;
1.1 cgd 525: if (prp->pr_type != type)
1.140 dyoung 526: return EPROTOTYPE;
1.160 ad 527:
528: so = soget(true);
1.1 cgd 529: so->so_type = type;
530: so->so_proto = prp;
1.33 matt 531: so->so_send = sosend;
532: so->so_receive = soreceive;
1.78 matt 533: #ifdef MBUFTRACE
534: so->so_rcv.sb_mowner = &prp->pr_domain->dom_mowner;
535: so->so_snd.sb_mowner = &prp->pr_domain->dom_mowner;
536: so->so_mowner = &prp->pr_domain->dom_mowner;
537: #endif
1.138 rmind 538: uid = kauth_cred_geteuid(l->l_cred);
1.115 yamt 539: so->so_uidinfo = uid_find(uid);
1.168 yamt 540: so->so_cpid = l->l_proc->p_pid;
1.224 rmind 541:
542: /*
543: * Lock assigned and taken during PCB attach, unless we share
544: * the lock with another socket, e.g. socketpair(2) case.
545: */
546: if (lockso) {
1.160 ad 547: lock = lockso->so_lock;
548: so->so_lock = lock;
549: mutex_obj_hold(lock);
550: mutex_enter(lock);
551: }
1.224 rmind 552:
553: /* Attach the PCB (returns with the socket lock held). */
554: error = (*prp->pr_usrreqs->pr_attach)(so, proto);
1.160 ad 555: KASSERT(solocked(so));
1.224 rmind 556:
557: if (error) {
1.222 rmind 558: KASSERT(so->so_pcb == NULL);
1.1 cgd 559: so->so_state |= SS_NOFDREF;
560: sofree(so);
1.140 dyoung 561: return error;
1.1 cgd 562: }
1.198 elad 563: so->so_cred = kauth_cred_dup(l->l_cred);
1.160 ad 564: sounlock(so);
1.224 rmind 565:
1.1 cgd 566: *aso = so;
1.140 dyoung 567: return 0;
1.1 cgd 568: }
569:
1.222 rmind 570: /*
571: * fsocreate: create a socket and a file descriptor associated with it.
572: *
573: * => On success, write file descriptor to fdout and return zero.
574: * => On failure, return non-zero; *fdout will be undefined.
1.142 dyoung 575: */
576: int
1.222 rmind 577: fsocreate(int domain, struct socket **sop, int type, int proto, int *fdout)
1.142 dyoung 578: {
1.222 rmind 579: lwp_t *l = curlwp;
580: int error, fd, flags;
581: struct socket *so;
582: struct file *fp;
1.142 dyoung 583:
1.222 rmind 584: if ((error = fd_allocfile(&fp, &fd)) != 0) {
1.204 christos 585: return error;
1.222 rmind 586: }
587: flags = type & SOCK_FLAGS_MASK;
1.204 christos 588: fd_set_exclose(l, fd, (flags & SOCK_CLOEXEC) != 0);
1.207 christos 589: fp->f_flag = FREAD|FWRITE|((flags & SOCK_NONBLOCK) ? FNONBLOCK : 0)|
590: ((flags & SOCK_NOSIGPIPE) ? FNOSIGPIPE : 0);
1.142 dyoung 591: fp->f_type = DTYPE_SOCKET;
592: fp->f_ops = &socketops;
1.222 rmind 593:
594: type &= ~SOCK_FLAGS_MASK;
595: error = socreate(domain, &so, type, proto, l, NULL);
596: if (error) {
1.155 ad 597: fd_abort(curproc, fp, fd);
1.222 rmind 598: return error;
599: }
600: if (flags & SOCK_NONBLOCK) {
601: so->so_state |= SS_NBIO;
602: }
1.235 matt 603: fp->f_socket = so;
1.222 rmind 604: fd_affix(curproc, fp, fd);
605:
606: if (sop != NULL) {
607: *sop = so;
1.142 dyoung 608: }
1.222 rmind 609: *fdout = fd;
1.142 dyoung 610: return error;
611: }
612:
1.3 andrew 613: int
1.190 dyoung 614: sofamily(const struct socket *so)
615: {
616: const struct protosw *pr;
617: const struct domain *dom;
618:
619: if ((pr = so->so_proto) == NULL)
620: return AF_UNSPEC;
621: if ((dom = pr->pr_domain) == NULL)
622: return AF_UNSPEC;
623: return dom->dom_family;
624: }
625:
626: int
1.235.2.1 skrll 627: sobind(struct socket *so, struct sockaddr *nam, struct lwp *l)
1.1 cgd 628: {
1.160 ad 629: int error;
1.1 cgd 630:
1.160 ad 631: solock(so);
1.235.2.1 skrll 632: if (nam->sa_family != so->so_proto->pr_domain->dom_family) {
633: sounlock(so);
634: return EAFNOSUPPORT;
635: }
1.231 rtr 636: error = (*so->so_proto->pr_usrreqs->pr_bind)(so, nam, l);
1.160 ad 637: sounlock(so);
1.140 dyoung 638: return error;
1.1 cgd 639: }
640:
1.3 andrew 641: int
1.150 elad 642: solisten(struct socket *so, int backlog, struct lwp *l)
1.1 cgd 643: {
1.160 ad 644: int error;
1.1 cgd 645:
1.160 ad 646: solock(so);
1.235.2.2! skrll 647: if ((so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING |
1.163 ad 648: SS_ISDISCONNECTING)) != 0) {
1.222 rmind 649: sounlock(so);
650: return EINVAL;
1.163 ad 651: }
1.231 rtr 652: error = (*so->so_proto->pr_usrreqs->pr_listen)(so, l);
1.140 dyoung 653: if (error != 0) {
1.160 ad 654: sounlock(so);
1.140 dyoung 655: return error;
1.1 cgd 656: }
1.63 matt 657: if (TAILQ_EMPTY(&so->so_q))
1.1 cgd 658: so->so_options |= SO_ACCEPTCONN;
659: if (backlog < 0)
660: backlog = 0;
1.49 jonathan 661: so->so_qlimit = min(backlog, somaxconn);
1.160 ad 662: sounlock(so);
1.140 dyoung 663: return 0;
1.1 cgd 664: }
665:
1.21 christos 666: void
1.54 lukem 667: sofree(struct socket *so)
1.1 cgd 668: {
1.161 ad 669: u_int refs;
1.1 cgd 670:
1.160 ad 671: KASSERT(solocked(so));
672:
673: if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0) {
674: sounlock(so);
1.1 cgd 675: return;
1.160 ad 676: }
1.43 mycroft 677: if (so->so_head) {
678: /*
679: * We must not decommission a socket that's on the accept(2)
680: * queue. If we do, then accept(2) may hang after select(2)
681: * indicated that the listening socket was ready.
682: */
1.160 ad 683: if (!soqremque(so, 0)) {
684: sounlock(so);
1.43 mycroft 685: return;
1.160 ad 686: }
1.43 mycroft 687: }
1.98 christos 688: if (so->so_rcv.sb_hiwat)
1.110 christos 689: (void)chgsbsize(so->so_uidinfo, &so->so_rcv.sb_hiwat, 0,
1.98 christos 690: RLIM_INFINITY);
691: if (so->so_snd.sb_hiwat)
1.110 christos 692: (void)chgsbsize(so->so_uidinfo, &so->so_snd.sb_hiwat, 0,
1.98 christos 693: RLIM_INFINITY);
694: sbrelease(&so->so_snd, so);
1.160 ad 695: KASSERT(!cv_has_waiters(&so->so_cv));
696: KASSERT(!cv_has_waiters(&so->so_rcv.sb_cv));
697: KASSERT(!cv_has_waiters(&so->so_snd.sb_cv));
1.1 cgd 698: sorflush(so);
1.161 ad 699: refs = so->so_aborting; /* XXX */
1.177 ad 700: /* Remove acccept filter if one is present. */
1.170 tls 701: if (so->so_accf != NULL)
1.177 ad 702: (void)accept_filt_clear(so);
1.160 ad 703: sounlock(so);
1.161 ad 704: if (refs == 0) /* XXX */
705: soput(so);
1.1 cgd 706: }
707:
708: /*
1.222 rmind 709: * soclose: close a socket on last file table reference removal.
710: * Initiate disconnect if connected. Free socket when disconnect complete.
1.1 cgd 711: */
1.3 andrew 712: int
1.54 lukem 713: soclose(struct socket *so)
1.1 cgd 714: {
1.222 rmind 715: struct socket *so2;
716: int error = 0;
1.1 cgd 717:
1.160 ad 718: solock(so);
1.1 cgd 719: if (so->so_options & SO_ACCEPTCONN) {
1.172 ad 720: for (;;) {
721: if ((so2 = TAILQ_FIRST(&so->so_q0)) != 0) {
1.160 ad 722: KASSERT(solocked2(so, so2));
723: (void) soqremque(so2, 0);
724: /* soabort drops the lock. */
725: (void) soabort(so2);
726: solock(so);
1.172 ad 727: continue;
1.160 ad 728: }
1.172 ad 729: if ((so2 = TAILQ_FIRST(&so->so_q)) != 0) {
1.160 ad 730: KASSERT(solocked2(so, so2));
731: (void) soqremque(so2, 1);
732: /* soabort drops the lock. */
733: (void) soabort(so2);
734: solock(so);
1.172 ad 735: continue;
1.160 ad 736: }
1.172 ad 737: break;
738: }
1.1 cgd 739: }
1.222 rmind 740: if (so->so_pcb == NULL)
1.1 cgd 741: goto discard;
742: if (so->so_state & SS_ISCONNECTED) {
743: if ((so->so_state & SS_ISDISCONNECTING) == 0) {
744: error = sodisconnect(so);
745: if (error)
746: goto drop;
747: }
748: if (so->so_options & SO_LINGER) {
1.206 christos 749: if ((so->so_state & (SS_ISDISCONNECTING|SS_NBIO)) ==
750: (SS_ISDISCONNECTING|SS_NBIO))
1.1 cgd 751: goto drop;
1.21 christos 752: while (so->so_state & SS_ISCONNECTED) {
1.185 yamt 753: error = sowait(so, true, so->so_linger * hz);
1.21 christos 754: if (error)
1.1 cgd 755: break;
1.21 christos 756: }
1.1 cgd 757: }
758: }
1.54 lukem 759: drop:
1.1 cgd 760: if (so->so_pcb) {
1.224 rmind 761: KASSERT(solocked(so));
762: (*so->so_proto->pr_usrreqs->pr_detach)(so);
1.1 cgd 763: }
1.54 lukem 764: discard:
1.222 rmind 765: KASSERT((so->so_state & SS_NOFDREF) == 0);
1.198 elad 766: kauth_cred_free(so->so_cred);
1.1 cgd 767: so->so_state |= SS_NOFDREF;
768: sofree(so);
1.222 rmind 769: return error;
1.1 cgd 770: }
771:
772: /*
1.160 ad 773: * Must be called with the socket locked.. Will return with it unlocked.
1.1 cgd 774: */
1.3 andrew 775: int
1.54 lukem 776: soabort(struct socket *so)
1.1 cgd 777: {
1.161 ad 778: u_int refs;
1.139 yamt 779: int error;
1.235.2.2! skrll 780:
1.160 ad 781: KASSERT(solocked(so));
782: KASSERT(so->so_head == NULL);
1.1 cgd 783:
1.161 ad 784: so->so_aborting++; /* XXX */
1.230 mrg 785: error = (*so->so_proto->pr_usrreqs->pr_abort)(so);
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
1.235.2.2! skrll 796: soaccept(struct socket *so, struct sockaddr *nam)
1.1 cgd 797: {
1.222 rmind 798: int error;
1.160 ad 799:
800: KASSERT(solocked(so));
1.222 rmind 801: KASSERT((so->so_state & SS_NOFDREF) != 0);
1.1 cgd 802:
803: so->so_state &= ~SS_NOFDREF;
1.55 thorpej 804: if ((so->so_state & SS_ISDISCONNECTED) == 0 ||
805: (so->so_proto->pr_flags & PR_ABRTACPTDIS) == 0)
1.225 rtr 806: error = (*so->so_proto->pr_usrreqs->pr_accept)(so, nam);
1.41 mycroft 807: else
1.53 itojun 808: error = ECONNABORTED;
1.52 itojun 809:
1.222 rmind 810: return error;
1.1 cgd 811: }
812:
1.3 andrew 813: int
1.235.2.2! skrll 814: soconnect(struct socket *so, struct sockaddr *nam, struct lwp *l)
1.1 cgd 815: {
1.222 rmind 816: int error;
1.160 ad 817:
818: KASSERT(solocked(so));
1.1 cgd 819:
820: if (so->so_options & SO_ACCEPTCONN)
1.222 rmind 821: return EOPNOTSUPP;
1.1 cgd 822: /*
823: * If protocol is connection-based, can only connect once.
824: * Otherwise, if connected, try to disconnect first.
825: * This allows user to disconnect by connecting to, e.g.,
826: * a null address.
827: */
828: if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
829: ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
1.235.2.2! skrll 830: (error = sodisconnect(so)))) {
1.1 cgd 831: error = EISCONN;
1.235.2.2! skrll 832: } else {
! 833: if (nam->sa_family != so->so_proto->pr_domain->dom_family) {
! 834: return EAFNOSUPPORT;
! 835: }
1.231 rtr 836: error = (*so->so_proto->pr_usrreqs->pr_connect)(so, nam, l);
1.235.2.2! skrll 837: }
1.222 rmind 838:
839: return error;
1.1 cgd 840: }
841:
1.3 andrew 842: int
1.54 lukem 843: soconnect2(struct socket *so1, struct socket *so2)
1.1 cgd 844: {
1.160 ad 845: KASSERT(solocked2(so1, so2));
1.1 cgd 846:
1.234 rtr 847: return (*so1->so_proto->pr_usrreqs->pr_connect2)(so1, so2);
1.1 cgd 848: }
849:
1.3 andrew 850: int
1.54 lukem 851: sodisconnect(struct socket *so)
1.1 cgd 852: {
1.160 ad 853: int error;
854:
855: KASSERT(solocked(so));
1.1 cgd 856:
857: if ((so->so_state & SS_ISCONNECTED) == 0) {
858: error = ENOTCONN;
1.160 ad 859: } else if (so->so_state & SS_ISDISCONNECTING) {
1.1 cgd 860: error = EALREADY;
1.160 ad 861: } else {
1.229 rtr 862: error = (*so->so_proto->pr_usrreqs->pr_disconnect)(so);
1.1 cgd 863: }
864: return (error);
865: }
866:
1.15 mycroft 867: #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK)
1.1 cgd 868: /*
869: * Send on a socket.
870: * If send must go all at once and message is larger than
871: * send buffering, then hard error.
872: * Lock against other senders.
873: * If must go all at once and not enough room now, then
874: * inform user that this would block and do nothing.
875: * Otherwise, if nonblocking, send as much as possible.
876: * The data to be sent is described by "uio" if nonzero,
877: * otherwise by the mbuf chain "top" (which must be null
878: * if uio is not). Data provided in mbuf chain must be small
879: * enough to send all at once.
880: *
881: * Returns nonzero on error, timeout or signal; callers
882: * must check for short counts if EINTR/ERESTART are returned.
883: * Data and control buffers are freed on return.
884: */
1.3 andrew 885: int
1.235.2.2! skrll 886: sosend(struct socket *so, struct sockaddr *addr, struct uio *uio,
! 887: struct mbuf *top, struct mbuf *control, int flags, struct lwp *l)
1.1 cgd 888: {
1.54 lukem 889: struct mbuf **mp, *m;
1.58 jdolecek 890: long space, len, resid, clen, mlen;
891: int error, s, dontroute, atomic;
1.196 dsl 892: short wakeup_state = 0;
1.54 lukem 893:
1.160 ad 894: clen = 0;
1.64 thorpej 895:
1.160 ad 896: /*
897: * solock() provides atomicity of access. splsoftnet() prevents
898: * protocol processing soft interrupts from interrupting us and
899: * blocking (expensive).
900: */
901: s = splsoftnet();
902: solock(so);
1.54 lukem 903: atomic = sosendallatonce(so) || top;
1.1 cgd 904: if (uio)
905: resid = uio->uio_resid;
906: else
907: resid = top->m_pkthdr.len;
1.7 cgd 908: /*
909: * In theory resid should be unsigned.
910: * However, space must be signed, as it might be less than 0
911: * if we over-committed, and we must use a signed comparison
912: * of space and resid. On the other hand, a negative resid
913: * causes us to loop sending 0-length segments to the protocol.
914: */
1.29 mycroft 915: if (resid < 0) {
916: error = EINVAL;
917: goto out;
918: }
1.1 cgd 919: dontroute =
920: (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
921: (so->so_proto->pr_flags & PR_ATOMIC);
1.165 christos 922: l->l_ru.ru_msgsnd++;
1.1 cgd 923: if (control)
924: clen = control->m_len;
1.54 lukem 925: restart:
1.21 christos 926: if ((error = sblock(&so->so_snd, SBLOCKWAIT(flags))) != 0)
1.1 cgd 927: goto out;
928: do {
1.160 ad 929: if (so->so_state & SS_CANTSENDMORE) {
930: error = EPIPE;
931: goto release;
932: }
1.48 thorpej 933: if (so->so_error) {
934: error = so->so_error;
935: so->so_error = 0;
936: goto release;
937: }
1.1 cgd 938: if ((so->so_state & SS_ISCONNECTED) == 0) {
939: if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
1.217 rmind 940: if (resid || clen == 0) {
1.160 ad 941: error = ENOTCONN;
942: goto release;
943: }
1.235.2.2! skrll 944: } else if (addr == NULL) {
1.160 ad 945: error = EDESTADDRREQ;
946: goto release;
947: }
1.1 cgd 948: }
949: space = sbspace(&so->so_snd);
950: if (flags & MSG_OOB)
951: space += 1024;
1.21 christos 952: if ((atomic && resid > so->so_snd.sb_hiwat) ||
1.160 ad 953: clen > so->so_snd.sb_hiwat) {
954: error = EMSGSIZE;
955: goto release;
956: }
1.96 mycroft 957: if (space < resid + clen &&
1.1 cgd 958: (atomic || space < so->so_snd.sb_lowat || space < clen)) {
1.206 christos 959: if ((so->so_state & SS_NBIO) || (flags & MSG_NBIO)) {
1.160 ad 960: error = EWOULDBLOCK;
961: goto release;
962: }
1.1 cgd 963: sbunlock(&so->so_snd);
1.196 dsl 964: if (wakeup_state & SS_RESTARTSYS) {
965: error = ERESTART;
966: goto out;
967: }
1.1 cgd 968: error = sbwait(&so->so_snd);
969: if (error)
970: goto out;
1.196 dsl 971: wakeup_state = so->so_state;
1.1 cgd 972: goto restart;
973: }
1.196 dsl 974: wakeup_state = 0;
1.1 cgd 975: mp = ⊤
976: space -= clen;
977: do {
1.45 tv 978: if (uio == NULL) {
979: /*
980: * Data is prepackaged in "top".
981: */
982: resid = 0;
983: if (flags & MSG_EOR)
984: top->m_flags |= M_EOR;
985: } else do {
1.160 ad 986: sounlock(so);
987: splx(s);
1.144 dyoung 988: if (top == NULL) {
1.78 matt 989: m = m_gethdr(M_WAIT, MT_DATA);
1.45 tv 990: mlen = MHLEN;
991: m->m_pkthdr.len = 0;
1.140 dyoung 992: m->m_pkthdr.rcvif = NULL;
1.45 tv 993: } else {
1.78 matt 994: m = m_get(M_WAIT, MT_DATA);
1.45 tv 995: mlen = MLEN;
996: }
1.78 matt 997: MCLAIM(m, so->so_snd.sb_mowner);
1.121 yamt 998: if (sock_loan_thresh >= 0 &&
999: uio->uio_iov->iov_len >= sock_loan_thresh &&
1000: space >= sock_loan_thresh &&
1.64 thorpej 1001: (len = sosend_loan(so, uio, m,
1002: space)) != 0) {
1003: SOSEND_COUNTER_INCR(&sosend_loan_big);
1004: space -= len;
1005: goto have_data;
1006: }
1.45 tv 1007: if (resid >= MINCLSIZE && space >= MCLBYTES) {
1.64 thorpej 1008: SOSEND_COUNTER_INCR(&sosend_copy_big);
1.201 oki 1009: m_clget(m, M_DONTWAIT);
1.45 tv 1010: if ((m->m_flags & M_EXT) == 0)
1011: goto nopages;
1012: mlen = MCLBYTES;
1013: if (atomic && top == 0) {
1.58 jdolecek 1014: len = lmin(MCLBYTES - max_hdr,
1.54 lukem 1015: resid);
1.45 tv 1016: m->m_data += max_hdr;
1017: } else
1.58 jdolecek 1018: len = lmin(MCLBYTES, resid);
1.45 tv 1019: space -= len;
1020: } else {
1.64 thorpej 1021: nopages:
1022: SOSEND_COUNTER_INCR(&sosend_copy_small);
1.58 jdolecek 1023: len = lmin(lmin(mlen, resid), space);
1.45 tv 1024: space -= len;
1025: /*
1026: * For datagram protocols, leave room
1027: * for protocol headers in first mbuf.
1028: */
1029: if (atomic && top == 0 && len < mlen)
1030: MH_ALIGN(m, len);
1031: }
1.144 dyoung 1032: error = uiomove(mtod(m, void *), (int)len, uio);
1.64 thorpej 1033: have_data:
1.45 tv 1034: resid = uio->uio_resid;
1035: m->m_len = len;
1036: *mp = m;
1037: top->m_pkthdr.len += len;
1.160 ad 1038: s = splsoftnet();
1039: solock(so);
1.144 dyoung 1040: if (error != 0)
1.45 tv 1041: goto release;
1042: mp = &m->m_next;
1043: if (resid <= 0) {
1044: if (flags & MSG_EOR)
1045: top->m_flags |= M_EOR;
1046: break;
1047: }
1048: } while (space > 0 && atomic);
1.108 perry 1049:
1.160 ad 1050: if (so->so_state & SS_CANTSENDMORE) {
1051: error = EPIPE;
1052: goto release;
1053: }
1.45 tv 1054: if (dontroute)
1055: so->so_options |= SO_DONTROUTE;
1056: if (resid > 0)
1057: so->so_state |= SS_MORETOCOME;
1.235.2.2! skrll 1058: if (flags & MSG_OOB) {
1.226 rtr 1059: error = (*so->so_proto->pr_usrreqs->pr_sendoob)(so,
1060: top, control);
1.235.2.2! skrll 1061: } else {
1.232 rtr 1062: error = (*so->so_proto->pr_usrreqs->pr_send)(so,
1063: top, addr, control, l);
1.235.2.2! skrll 1064: }
1.45 tv 1065: if (dontroute)
1066: so->so_options &= ~SO_DONTROUTE;
1067: if (resid > 0)
1068: so->so_state &= ~SS_MORETOCOME;
1069: clen = 0;
1.144 dyoung 1070: control = NULL;
1071: top = NULL;
1.45 tv 1072: mp = ⊤
1.144 dyoung 1073: if (error != 0)
1.1 cgd 1074: goto release;
1075: } while (resid && space > 0);
1076: } while (resid);
1077:
1.54 lukem 1078: release:
1.1 cgd 1079: sbunlock(&so->so_snd);
1.54 lukem 1080: out:
1.160 ad 1081: sounlock(so);
1082: splx(s);
1.1 cgd 1083: if (top)
1084: m_freem(top);
1085: if (control)
1086: m_freem(control);
1087: return (error);
1088: }
1089:
1090: /*
1.159 ad 1091: * Following replacement or removal of the first mbuf on the first
1092: * mbuf chain of a socket buffer, push necessary state changes back
1093: * into the socket buffer so that other consumers see the values
1094: * consistently. 'nextrecord' is the callers locally stored value of
1095: * the original value of sb->sb_mb->m_nextpkt which must be restored
1096: * when the lead mbuf changes. NOTE: 'nextrecord' may be NULL.
1097: */
1098: static void
1099: sbsync(struct sockbuf *sb, struct mbuf *nextrecord)
1100: {
1101:
1.160 ad 1102: KASSERT(solocked(sb->sb_so));
1103:
1.159 ad 1104: /*
1105: * First, update for the new value of nextrecord. If necessary,
1106: * make it the first record.
1107: */
1108: if (sb->sb_mb != NULL)
1109: sb->sb_mb->m_nextpkt = nextrecord;
1110: else
1111: sb->sb_mb = nextrecord;
1112:
1113: /*
1114: * Now update any dependent socket buffer fields to reflect
1115: * the new state. This is an inline of SB_EMPTY_FIXUP, with
1116: * the addition of a second clause that takes care of the
1117: * case where sb_mb has been updated, but remains the last
1118: * record.
1119: */
1120: if (sb->sb_mb == NULL) {
1121: sb->sb_mbtail = NULL;
1122: sb->sb_lastrecord = NULL;
1123: } else if (sb->sb_mb->m_nextpkt == NULL)
1124: sb->sb_lastrecord = sb->sb_mb;
1125: }
1126:
1127: /*
1.1 cgd 1128: * Implement receive operations on a socket.
1129: * We depend on the way that records are added to the sockbuf
1130: * by sbappend*. In particular, each record (mbufs linked through m_next)
1131: * must begin with an address if the protocol so specifies,
1132: * followed by an optional mbuf or mbufs containing ancillary data,
1133: * and then zero or more mbufs of data.
1134: * In order to avoid blocking network interrupts for the entire time here,
1135: * we splx() while doing the actual copy to user space.
1136: * Although the sockbuf is locked, new data may still be appended,
1137: * and thus we must maintain consistency of the sockbuf during that time.
1138: *
1139: * The caller may receive the data as a single mbuf chain by supplying
1140: * an mbuf **mp0 for use in returning the chain. The uio is then used
1141: * only for the count in uio_resid.
1142: */
1.3 andrew 1143: int
1.54 lukem 1144: soreceive(struct socket *so, struct mbuf **paddr, struct uio *uio,
1145: struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
1.1 cgd 1146: {
1.116 yamt 1147: struct lwp *l = curlwp;
1.160 ad 1148: struct mbuf *m, **mp, *mt;
1.211 chs 1149: size_t len, offset, moff, orig_resid;
1150: int atomic, flags, error, s, type;
1.99 matt 1151: const struct protosw *pr;
1.54 lukem 1152: struct mbuf *nextrecord;
1.67 he 1153: int mbuf_removed = 0;
1.146 dyoung 1154: const struct domain *dom;
1.196 dsl 1155: short wakeup_state = 0;
1.64 thorpej 1156:
1.54 lukem 1157: pr = so->so_proto;
1.146 dyoung 1158: atomic = pr->pr_flags & PR_ATOMIC;
1159: dom = pr->pr_domain;
1.1 cgd 1160: mp = mp0;
1.54 lukem 1161: type = 0;
1162: orig_resid = uio->uio_resid;
1.102 jonathan 1163:
1.144 dyoung 1164: if (paddr != NULL)
1165: *paddr = NULL;
1166: if (controlp != NULL)
1167: *controlp = NULL;
1168: if (flagsp != NULL)
1.1 cgd 1169: flags = *flagsp &~ MSG_EOR;
1170: else
1171: flags = 0;
1.66 enami 1172:
1.1 cgd 1173: if (flags & MSG_OOB) {
1174: m = m_get(M_WAIT, MT_DATA);
1.160 ad 1175: solock(so);
1.226 rtr 1176: error = (*pr->pr_usrreqs->pr_recvoob)(so, m, flags & MSG_PEEK);
1.160 ad 1177: sounlock(so);
1.1 cgd 1178: if (error)
1179: goto bad;
1180: do {
1.134 christos 1181: error = uiomove(mtod(m, void *),
1.211 chs 1182: MIN(uio->uio_resid, m->m_len), uio);
1.1 cgd 1183: m = m_free(m);
1.144 dyoung 1184: } while (uio->uio_resid > 0 && error == 0 && m);
1.54 lukem 1185: bad:
1.144 dyoung 1186: if (m != NULL)
1.1 cgd 1187: m_freem(m);
1.144 dyoung 1188: return error;
1.1 cgd 1189: }
1.144 dyoung 1190: if (mp != NULL)
1.140 dyoung 1191: *mp = NULL;
1.160 ad 1192:
1193: /*
1194: * solock() provides atomicity of access. splsoftnet() prevents
1195: * protocol processing soft interrupts from interrupting us and
1196: * blocking (expensive).
1197: */
1198: s = splsoftnet();
1199: solock(so);
1.54 lukem 1200: restart:
1.160 ad 1201: if ((error = sblock(&so->so_rcv, SBLOCKWAIT(flags))) != 0) {
1202: sounlock(so);
1203: splx(s);
1.144 dyoung 1204: return error;
1.160 ad 1205: }
1.1 cgd 1206:
1207: m = so->so_rcv.sb_mb;
1208: /*
1209: * If we have less data than requested, block awaiting more
1210: * (subject to any timeout) if:
1.15 mycroft 1211: * 1. the current count is less than the low water mark,
1.1 cgd 1212: * 2. MSG_WAITALL is set, and it is possible to do the entire
1.15 mycroft 1213: * receive operation at once if we block (resid <= hiwat), or
1214: * 3. MSG_DONTWAIT is not set.
1.1 cgd 1215: * If MSG_WAITALL is set but resid is larger than the receive buffer,
1216: * we have to do the receive in sections, and thus risk returning
1217: * a short count if a timeout or signal occurs after we start.
1218: */
1.144 dyoung 1219: if (m == NULL ||
1220: ((flags & MSG_DONTWAIT) == 0 &&
1221: so->so_rcv.sb_cc < uio->uio_resid &&
1222: (so->so_rcv.sb_cc < so->so_rcv.sb_lowat ||
1223: ((flags & MSG_WAITALL) &&
1224: uio->uio_resid <= so->so_rcv.sb_hiwat)) &&
1.146 dyoung 1225: m->m_nextpkt == NULL && !atomic)) {
1.1 cgd 1226: #ifdef DIAGNOSTIC
1.144 dyoung 1227: if (m == NULL && so->so_rcv.sb_cc)
1.1 cgd 1228: panic("receive 1");
1229: #endif
1230: if (so->so_error) {
1.144 dyoung 1231: if (m != NULL)
1.15 mycroft 1232: goto dontblock;
1.1 cgd 1233: error = so->so_error;
1234: if ((flags & MSG_PEEK) == 0)
1235: so->so_error = 0;
1236: goto release;
1237: }
1238: if (so->so_state & SS_CANTRCVMORE) {
1.144 dyoung 1239: if (m != NULL)
1.15 mycroft 1240: goto dontblock;
1.1 cgd 1241: else
1242: goto release;
1243: }
1.144 dyoung 1244: for (; m != NULL; m = m->m_next)
1.1 cgd 1245: if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) {
1246: m = so->so_rcv.sb_mb;
1247: goto dontblock;
1248: }
1249: if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
1250: (so->so_proto->pr_flags & PR_CONNREQUIRED)) {
1251: error = ENOTCONN;
1252: goto release;
1253: }
1254: if (uio->uio_resid == 0)
1255: goto release;
1.206 christos 1256: if ((so->so_state & SS_NBIO) ||
1257: (flags & (MSG_DONTWAIT|MSG_NBIO))) {
1.1 cgd 1258: error = EWOULDBLOCK;
1259: goto release;
1260: }
1.69 thorpej 1261: SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 1");
1262: SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 1");
1.1 cgd 1263: sbunlock(&so->so_rcv);
1.196 dsl 1264: if (wakeup_state & SS_RESTARTSYS)
1265: error = ERESTART;
1266: else
1267: error = sbwait(&so->so_rcv);
1.160 ad 1268: if (error != 0) {
1269: sounlock(so);
1270: splx(s);
1.144 dyoung 1271: return error;
1.160 ad 1272: }
1.196 dsl 1273: wakeup_state = so->so_state;
1.1 cgd 1274: goto restart;
1275: }
1.54 lukem 1276: dontblock:
1.69 thorpej 1277: /*
1278: * On entry here, m points to the first record of the socket buffer.
1.159 ad 1279: * From this point onward, we maintain 'nextrecord' as a cache of the
1280: * pointer to the next record in the socket buffer. We must keep the
1281: * various socket buffer pointers and local stack versions of the
1282: * pointers in sync, pushing out modifications before dropping the
1.160 ad 1283: * socket lock, and re-reading them when picking it up.
1.159 ad 1284: *
1285: * Otherwise, we will race with the network stack appending new data
1286: * or records onto the socket buffer by using inconsistent/stale
1287: * versions of the field, possibly resulting in socket buffer
1288: * corruption.
1289: *
1290: * By holding the high-level sblock(), we prevent simultaneous
1291: * readers from pulling off the front of the socket buffer.
1.69 thorpej 1292: */
1.144 dyoung 1293: if (l != NULL)
1.157 ad 1294: l->l_ru.ru_msgrcv++;
1.69 thorpej 1295: KASSERT(m == so->so_rcv.sb_mb);
1296: SBLASTRECORDCHK(&so->so_rcv, "soreceive 1");
1297: SBLASTMBUFCHK(&so->so_rcv, "soreceive 1");
1.1 cgd 1298: nextrecord = m->m_nextpkt;
1299: if (pr->pr_flags & PR_ADDR) {
1300: #ifdef DIAGNOSTIC
1301: if (m->m_type != MT_SONAME)
1302: panic("receive 1a");
1303: #endif
1.3 andrew 1304: orig_resid = 0;
1.1 cgd 1305: if (flags & MSG_PEEK) {
1306: if (paddr)
1307: *paddr = m_copy(m, 0, m->m_len);
1308: m = m->m_next;
1309: } else {
1310: sbfree(&so->so_rcv, m);
1.67 he 1311: mbuf_removed = 1;
1.144 dyoung 1312: if (paddr != NULL) {
1.1 cgd 1313: *paddr = m;
1314: so->so_rcv.sb_mb = m->m_next;
1.144 dyoung 1315: m->m_next = NULL;
1.1 cgd 1316: m = so->so_rcv.sb_mb;
1317: } else {
1318: MFREE(m, so->so_rcv.sb_mb);
1319: m = so->so_rcv.sb_mb;
1320: }
1.159 ad 1321: sbsync(&so->so_rcv, nextrecord);
1.1 cgd 1322: }
1323: }
1.159 ad 1324:
1325: /*
1326: * Process one or more MT_CONTROL mbufs present before any data mbufs
1327: * in the first mbuf chain on the socket buffer. If MSG_PEEK, we
1328: * just copy the data; if !MSG_PEEK, we call into the protocol to
1329: * perform externalization (or freeing if controlp == NULL).
1330: */
1331: if (__predict_false(m != NULL && m->m_type == MT_CONTROL)) {
1332: struct mbuf *cm = NULL, *cmn;
1333: struct mbuf **cme = &cm;
1334:
1335: do {
1336: if (flags & MSG_PEEK) {
1337: if (controlp != NULL) {
1338: *controlp = m_copy(m, 0, m->m_len);
1339: controlp = &(*controlp)->m_next;
1340: }
1341: m = m->m_next;
1342: } else {
1343: sbfree(&so->so_rcv, m);
1.1 cgd 1344: so->so_rcv.sb_mb = m->m_next;
1.144 dyoung 1345: m->m_next = NULL;
1.159 ad 1346: *cme = m;
1347: cme = &(*cme)->m_next;
1.1 cgd 1348: m = so->so_rcv.sb_mb;
1.159 ad 1349: }
1350: } while (m != NULL && m->m_type == MT_CONTROL);
1351: if ((flags & MSG_PEEK) == 0)
1352: sbsync(&so->so_rcv, nextrecord);
1353: for (; cm != NULL; cm = cmn) {
1354: cmn = cm->m_next;
1355: cm->m_next = NULL;
1356: type = mtod(cm, struct cmsghdr *)->cmsg_type;
1357: if (controlp != NULL) {
1358: if (dom->dom_externalize != NULL &&
1359: type == SCM_RIGHTS) {
1.160 ad 1360: sounlock(so);
1.159 ad 1361: splx(s);
1.204 christos 1362: error = (*dom->dom_externalize)(cm, l,
1363: (flags & MSG_CMSG_CLOEXEC) ?
1364: O_CLOEXEC : 0);
1.159 ad 1365: s = splsoftnet();
1.160 ad 1366: solock(so);
1.159 ad 1367: }
1368: *controlp = cm;
1369: while (*controlp != NULL)
1370: controlp = &(*controlp)->m_next;
1.1 cgd 1371: } else {
1.106 itojun 1372: /*
1373: * Dispose of any SCM_RIGHTS message that went
1374: * through the read path rather than recv.
1375: */
1.159 ad 1376: if (dom->dom_dispose != NULL &&
1377: type == SCM_RIGHTS) {
1.160 ad 1378: sounlock(so);
1.159 ad 1379: (*dom->dom_dispose)(cm);
1.160 ad 1380: solock(so);
1.159 ad 1381: }
1382: m_freem(cm);
1.1 cgd 1383: }
1384: }
1.159 ad 1385: if (m != NULL)
1386: nextrecord = so->so_rcv.sb_mb->m_nextpkt;
1387: else
1388: nextrecord = so->so_rcv.sb_mb;
1389: orig_resid = 0;
1.1 cgd 1390: }
1.69 thorpej 1391:
1.159 ad 1392: /* If m is non-NULL, we have some data to read. */
1393: if (__predict_true(m != NULL)) {
1.1 cgd 1394: type = m->m_type;
1395: if (type == MT_OOBDATA)
1396: flags |= MSG_OOB;
1397: }
1.69 thorpej 1398: SBLASTRECORDCHK(&so->so_rcv, "soreceive 2");
1399: SBLASTMBUFCHK(&so->so_rcv, "soreceive 2");
1400:
1.1 cgd 1401: moff = 0;
1402: offset = 0;
1.144 dyoung 1403: while (m != NULL && uio->uio_resid > 0 && error == 0) {
1.1 cgd 1404: if (m->m_type == MT_OOBDATA) {
1405: if (type != MT_OOBDATA)
1406: break;
1407: } else if (type == MT_OOBDATA)
1408: break;
1409: #ifdef DIAGNOSTIC
1410: else if (m->m_type != MT_DATA && m->m_type != MT_HEADER)
1411: panic("receive 3");
1412: #endif
1413: so->so_state &= ~SS_RCVATMARK;
1.196 dsl 1414: wakeup_state = 0;
1.1 cgd 1415: len = uio->uio_resid;
1416: if (so->so_oobmark && len > so->so_oobmark - offset)
1417: len = so->so_oobmark - offset;
1418: if (len > m->m_len - moff)
1419: len = m->m_len - moff;
1420: /*
1421: * If mp is set, just pass back the mbufs.
1422: * Otherwise copy them out via the uio, then free.
1423: * Sockbuf must be consistent here (points to current mbuf,
1424: * it points to next record) when we drop priority;
1425: * we must note any additions to the sockbuf when we
1426: * block interrupts again.
1427: */
1.144 dyoung 1428: if (mp == NULL) {
1.69 thorpej 1429: SBLASTRECORDCHK(&so->so_rcv, "soreceive uiomove");
1430: SBLASTMBUFCHK(&so->so_rcv, "soreceive uiomove");
1.160 ad 1431: sounlock(so);
1.1 cgd 1432: splx(s);
1.211 chs 1433: error = uiomove(mtod(m, char *) + moff, len, uio);
1.20 mycroft 1434: s = splsoftnet();
1.160 ad 1435: solock(so);
1.144 dyoung 1436: if (error != 0) {
1.67 he 1437: /*
1438: * If any part of the record has been removed
1439: * (such as the MT_SONAME mbuf, which will
1440: * happen when PR_ADDR, and thus also
1441: * PR_ATOMIC, is set), then drop the entire
1442: * record to maintain the atomicity of the
1443: * receive operation.
1444: *
1445: * This avoids a later panic("receive 1a")
1446: * when compiled with DIAGNOSTIC.
1447: */
1.146 dyoung 1448: if (m && mbuf_removed && atomic)
1.67 he 1449: (void) sbdroprecord(&so->so_rcv);
1450:
1.57 jdolecek 1451: goto release;
1.67 he 1452: }
1.1 cgd 1453: } else
1454: uio->uio_resid -= len;
1455: if (len == m->m_len - moff) {
1456: if (m->m_flags & M_EOR)
1457: flags |= MSG_EOR;
1458: if (flags & MSG_PEEK) {
1459: m = m->m_next;
1460: moff = 0;
1461: } else {
1462: nextrecord = m->m_nextpkt;
1463: sbfree(&so->so_rcv, m);
1464: if (mp) {
1465: *mp = m;
1466: mp = &m->m_next;
1467: so->so_rcv.sb_mb = m = m->m_next;
1.140 dyoung 1468: *mp = NULL;
1.1 cgd 1469: } else {
1470: MFREE(m, so->so_rcv.sb_mb);
1471: m = so->so_rcv.sb_mb;
1472: }
1.69 thorpej 1473: /*
1474: * If m != NULL, we also know that
1475: * so->so_rcv.sb_mb != NULL.
1476: */
1477: KASSERT(so->so_rcv.sb_mb == m);
1478: if (m) {
1.1 cgd 1479: m->m_nextpkt = nextrecord;
1.69 thorpej 1480: if (nextrecord == NULL)
1481: so->so_rcv.sb_lastrecord = m;
1482: } else {
1483: so->so_rcv.sb_mb = nextrecord;
1.70 thorpej 1484: SB_EMPTY_FIXUP(&so->so_rcv);
1.69 thorpej 1485: }
1486: SBLASTRECORDCHK(&so->so_rcv, "soreceive 3");
1487: SBLASTMBUFCHK(&so->so_rcv, "soreceive 3");
1.1 cgd 1488: }
1.144 dyoung 1489: } else if (flags & MSG_PEEK)
1490: moff += len;
1491: else {
1.160 ad 1492: if (mp != NULL) {
1493: mt = m_copym(m, 0, len, M_NOWAIT);
1494: if (__predict_false(mt == NULL)) {
1495: sounlock(so);
1496: mt = m_copym(m, 0, len, M_WAIT);
1497: solock(so);
1498: }
1499: *mp = mt;
1500: }
1.144 dyoung 1501: m->m_data += len;
1502: m->m_len -= len;
1503: so->so_rcv.sb_cc -= len;
1.1 cgd 1504: }
1505: if (so->so_oobmark) {
1506: if ((flags & MSG_PEEK) == 0) {
1507: so->so_oobmark -= len;
1508: if (so->so_oobmark == 0) {
1509: so->so_state |= SS_RCVATMARK;
1510: break;
1511: }
1.7 cgd 1512: } else {
1.1 cgd 1513: offset += len;
1.7 cgd 1514: if (offset == so->so_oobmark)
1515: break;
1516: }
1.1 cgd 1517: }
1518: if (flags & MSG_EOR)
1519: break;
1520: /*
1521: * If the MSG_WAITALL flag is set (for non-atomic socket),
1522: * we must not quit until "uio->uio_resid == 0" or an error
1523: * termination. If a signal/timeout occurs, return
1524: * with a short count but without error.
1525: * Keep sockbuf locked against other readers.
1526: */
1.144 dyoung 1527: while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 &&
1.3 andrew 1528: !sosendallatonce(so) && !nextrecord) {
1.1 cgd 1529: if (so->so_error || so->so_state & SS_CANTRCVMORE)
1530: break;
1.68 matt 1531: /*
1532: * If we are peeking and the socket receive buffer is
1533: * full, stop since we can't get more data to peek at.
1534: */
1535: if ((flags & MSG_PEEK) && sbspace(&so->so_rcv) <= 0)
1536: break;
1537: /*
1538: * If we've drained the socket buffer, tell the
1539: * protocol in case it needs to do something to
1540: * get it filled again.
1541: */
1542: if ((pr->pr_flags & PR_WANTRCVD) && so->so_pcb)
1.233 rtr 1543: (*pr->pr_usrreqs->pr_rcvd)(so, flags, l);
1.69 thorpej 1544: SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 2");
1545: SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 2");
1.196 dsl 1546: if (wakeup_state & SS_RESTARTSYS)
1547: error = ERESTART;
1548: else
1549: error = sbwait(&so->so_rcv);
1.144 dyoung 1550: if (error != 0) {
1.1 cgd 1551: sbunlock(&so->so_rcv);
1.160 ad 1552: sounlock(so);
1.1 cgd 1553: splx(s);
1.144 dyoung 1554: return 0;
1.1 cgd 1555: }
1.21 christos 1556: if ((m = so->so_rcv.sb_mb) != NULL)
1.1 cgd 1557: nextrecord = m->m_nextpkt;
1.196 dsl 1558: wakeup_state = so->so_state;
1.1 cgd 1559: }
1560: }
1.3 andrew 1561:
1.146 dyoung 1562: if (m && atomic) {
1.3 andrew 1563: flags |= MSG_TRUNC;
1564: if ((flags & MSG_PEEK) == 0)
1565: (void) sbdroprecord(&so->so_rcv);
1566: }
1.1 cgd 1567: if ((flags & MSG_PEEK) == 0) {
1.144 dyoung 1568: if (m == NULL) {
1.69 thorpej 1569: /*
1.70 thorpej 1570: * First part is an inline SB_EMPTY_FIXUP(). Second
1.69 thorpej 1571: * part makes sure sb_lastrecord is up-to-date if
1572: * there is still data in the socket buffer.
1573: */
1.1 cgd 1574: so->so_rcv.sb_mb = nextrecord;
1.69 thorpej 1575: if (so->so_rcv.sb_mb == NULL) {
1576: so->so_rcv.sb_mbtail = NULL;
1577: so->so_rcv.sb_lastrecord = NULL;
1578: } else if (nextrecord->m_nextpkt == NULL)
1579: so->so_rcv.sb_lastrecord = nextrecord;
1580: }
1581: SBLASTRECORDCHK(&so->so_rcv, "soreceive 4");
1582: SBLASTMBUFCHK(&so->so_rcv, "soreceive 4");
1.1 cgd 1583: if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
1.233 rtr 1584: (*pr->pr_usrreqs->pr_rcvd)(so, flags, l);
1.1 cgd 1585: }
1.3 andrew 1586: if (orig_resid == uio->uio_resid && orig_resid &&
1587: (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) {
1588: sbunlock(&so->so_rcv);
1589: goto restart;
1590: }
1.108 perry 1591:
1.144 dyoung 1592: if (flagsp != NULL)
1.1 cgd 1593: *flagsp |= flags;
1.54 lukem 1594: release:
1.1 cgd 1595: sbunlock(&so->so_rcv);
1.160 ad 1596: sounlock(so);
1.1 cgd 1597: splx(s);
1.144 dyoung 1598: return error;
1.1 cgd 1599: }
1600:
1.14 mycroft 1601: int
1.54 lukem 1602: soshutdown(struct socket *so, int how)
1.1 cgd 1603: {
1.99 matt 1604: const struct protosw *pr;
1.160 ad 1605: int error;
1606:
1607: KASSERT(solocked(so));
1.34 kleink 1608:
1.54 lukem 1609: pr = so->so_proto;
1.34 kleink 1610: if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR))
1611: return (EINVAL);
1.1 cgd 1612:
1.160 ad 1613: if (how == SHUT_RD || how == SHUT_RDWR) {
1.1 cgd 1614: sorflush(so);
1.160 ad 1615: error = 0;
1616: }
1.34 kleink 1617: if (how == SHUT_WR || how == SHUT_RDWR)
1.229 rtr 1618: error = (*pr->pr_usrreqs->pr_shutdown)(so);
1.160 ad 1619:
1620: return error;
1.1 cgd 1621: }
1622:
1.195 dsl 1623: void
1.196 dsl 1624: sorestart(struct socket *so)
1.188 ad 1625: {
1.196 dsl 1626: /*
1627: * An application has called close() on an fd on which another
1628: * of its threads has called a socket system call.
1629: * Mark this and wake everyone up, and code that would block again
1630: * instead returns ERESTART.
1631: * On system call re-entry the fd is validated and EBADF returned.
1632: * Any other fd will block again on the 2nd syscall.
1633: */
1.188 ad 1634: solock(so);
1.196 dsl 1635: so->so_state |= SS_RESTARTSYS;
1.188 ad 1636: cv_broadcast(&so->so_cv);
1.196 dsl 1637: cv_broadcast(&so->so_snd.sb_cv);
1638: cv_broadcast(&so->so_rcv.sb_cv);
1.188 ad 1639: sounlock(so);
1640: }
1641:
1.14 mycroft 1642: void
1.54 lukem 1643: sorflush(struct socket *so)
1.1 cgd 1644: {
1.54 lukem 1645: struct sockbuf *sb, asb;
1.99 matt 1646: const struct protosw *pr;
1.160 ad 1647:
1648: KASSERT(solocked(so));
1.1 cgd 1649:
1.54 lukem 1650: sb = &so->so_rcv;
1651: pr = so->so_proto;
1.160 ad 1652: socantrcvmore(so);
1.1 cgd 1653: sb->sb_flags |= SB_NOINTR;
1.160 ad 1654: (void )sblock(sb, M_WAITOK);
1.1 cgd 1655: sbunlock(sb);
1656: asb = *sb;
1.86 wrstuden 1657: /*
1658: * Clear most of the sockbuf structure, but leave some of the
1659: * fields valid.
1660: */
1661: memset(&sb->sb_startzero, 0,
1662: sizeof(*sb) - offsetof(struct sockbuf, sb_startzero));
1.160 ad 1663: if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose) {
1664: sounlock(so);
1.1 cgd 1665: (*pr->pr_domain->dom_dispose)(asb.sb_mb);
1.160 ad 1666: solock(so);
1667: }
1.98 christos 1668: sbrelease(&asb, so);
1.1 cgd 1669: }
1670:
1.171 plunky 1671: /*
1672: * internal set SOL_SOCKET options
1673: */
1.142 dyoung 1674: static int
1.171 plunky 1675: sosetopt1(struct socket *so, const struct sockopt *sopt)
1.1 cgd 1676: {
1.219 christos 1677: int error = EINVAL, opt;
1678: int optval = 0; /* XXX: gcc */
1.171 plunky 1679: struct linger l;
1680: struct timeval tv;
1.142 dyoung 1681:
1.179 christos 1682: switch ((opt = sopt->sopt_name)) {
1.142 dyoung 1683:
1.170 tls 1684: case SO_ACCEPTFILTER:
1.177 ad 1685: error = accept_filt_setopt(so, sopt);
1686: KASSERT(solocked(so));
1.170 tls 1687: break;
1688:
1.171 plunky 1689: case SO_LINGER:
1690: error = sockopt_get(sopt, &l, sizeof(l));
1.177 ad 1691: solock(so);
1.171 plunky 1692: if (error)
1.177 ad 1693: break;
1.171 plunky 1694: if (l.l_linger < 0 || l.l_linger > USHRT_MAX ||
1.177 ad 1695: l.l_linger > (INT_MAX / hz)) {
1696: error = EDOM;
1697: break;
1698: }
1.171 plunky 1699: so->so_linger = l.l_linger;
1700: if (l.l_onoff)
1701: so->so_options |= SO_LINGER;
1702: else
1703: so->so_options &= ~SO_LINGER;
1.177 ad 1704: break;
1.1 cgd 1705:
1.142 dyoung 1706: case SO_DEBUG:
1707: case SO_KEEPALIVE:
1708: case SO_DONTROUTE:
1709: case SO_USELOOPBACK:
1710: case SO_BROADCAST:
1711: case SO_REUSEADDR:
1712: case SO_REUSEPORT:
1713: case SO_OOBINLINE:
1714: case SO_TIMESTAMP:
1.207 christos 1715: case SO_NOSIGPIPE:
1.184 christos 1716: #ifdef SO_OTIMESTAMP
1717: case SO_OTIMESTAMP:
1718: #endif
1.171 plunky 1719: error = sockopt_getint(sopt, &optval);
1.177 ad 1720: solock(so);
1.171 plunky 1721: if (error)
1.177 ad 1722: break;
1.171 plunky 1723: if (optval)
1.179 christos 1724: so->so_options |= opt;
1.142 dyoung 1725: else
1.179 christos 1726: so->so_options &= ~opt;
1.142 dyoung 1727: break;
1728:
1729: case SO_SNDBUF:
1730: case SO_RCVBUF:
1731: case SO_SNDLOWAT:
1732: case SO_RCVLOWAT:
1.171 plunky 1733: error = sockopt_getint(sopt, &optval);
1.177 ad 1734: solock(so);
1.171 plunky 1735: if (error)
1.177 ad 1736: break;
1.1 cgd 1737:
1.142 dyoung 1738: /*
1739: * Values < 1 make no sense for any of these
1740: * options, so disallow them.
1741: */
1.177 ad 1742: if (optval < 1) {
1743: error = EINVAL;
1744: break;
1745: }
1.1 cgd 1746:
1.179 christos 1747: switch (opt) {
1.171 plunky 1748: case SO_SNDBUF:
1.177 ad 1749: if (sbreserve(&so->so_snd, (u_long)optval, so) == 0) {
1750: error = ENOBUFS;
1751: break;
1752: }
1.171 plunky 1753: so->so_snd.sb_flags &= ~SB_AUTOSIZE;
1754: break;
1.1 cgd 1755:
1756: case SO_RCVBUF:
1.177 ad 1757: if (sbreserve(&so->so_rcv, (u_long)optval, so) == 0) {
1758: error = ENOBUFS;
1759: break;
1760: }
1.171 plunky 1761: so->so_rcv.sb_flags &= ~SB_AUTOSIZE;
1.142 dyoung 1762: break;
1763:
1764: /*
1765: * Make sure the low-water is never greater than
1766: * the high-water.
1767: */
1.1 cgd 1768: case SO_SNDLOWAT:
1.171 plunky 1769: if (optval > so->so_snd.sb_hiwat)
1770: optval = so->so_snd.sb_hiwat;
1771:
1772: so->so_snd.sb_lowat = optval;
1.142 dyoung 1773: break;
1.171 plunky 1774:
1.1 cgd 1775: case SO_RCVLOWAT:
1.171 plunky 1776: if (optval > so->so_rcv.sb_hiwat)
1777: optval = so->so_rcv.sb_hiwat;
1778:
1779: so->so_rcv.sb_lowat = optval;
1.142 dyoung 1780: break;
1781: }
1782: break;
1.28 thorpej 1783:
1.179 christos 1784: #ifdef COMPAT_50
1785: case SO_OSNDTIMEO:
1786: case SO_ORCVTIMEO: {
1787: struct timeval50 otv;
1788: error = sockopt_get(sopt, &otv, sizeof(otv));
1.186 pooka 1789: if (error) {
1790: solock(so);
1.183 christos 1791: break;
1.186 pooka 1792: }
1.179 christos 1793: timeval50_to_timeval(&otv, &tv);
1794: opt = opt == SO_OSNDTIMEO ? SO_SNDTIMEO : SO_RCVTIMEO;
1.182 christos 1795: error = 0;
1.179 christos 1796: /*FALLTHROUGH*/
1797: }
1798: #endif /* COMPAT_50 */
1799:
1.142 dyoung 1800: case SO_SNDTIMEO:
1801: case SO_RCVTIMEO:
1.182 christos 1802: if (error)
1.179 christos 1803: error = sockopt_get(sopt, &tv, sizeof(tv));
1.177 ad 1804: solock(so);
1.171 plunky 1805: if (error)
1.177 ad 1806: break;
1.171 plunky 1807:
1.177 ad 1808: if (tv.tv_sec > (INT_MAX - tv.tv_usec / tick) / hz) {
1809: error = EDOM;
1810: break;
1811: }
1.28 thorpej 1812:
1.171 plunky 1813: optval = tv.tv_sec * hz + tv.tv_usec / tick;
1814: if (optval == 0 && tv.tv_usec != 0)
1815: optval = 1;
1.28 thorpej 1816:
1.179 christos 1817: switch (opt) {
1.142 dyoung 1818: case SO_SNDTIMEO:
1.171 plunky 1819: so->so_snd.sb_timeo = optval;
1.1 cgd 1820: break;
1821: case SO_RCVTIMEO:
1.171 plunky 1822: so->so_rcv.sb_timeo = optval;
1.142 dyoung 1823: break;
1824: }
1825: break;
1.1 cgd 1826:
1.142 dyoung 1827: default:
1.177 ad 1828: solock(so);
1829: error = ENOPROTOOPT;
1830: break;
1.142 dyoung 1831: }
1.177 ad 1832: KASSERT(solocked(so));
1833: return error;
1.142 dyoung 1834: }
1.1 cgd 1835:
1.142 dyoung 1836: int
1.171 plunky 1837: sosetopt(struct socket *so, struct sockopt *sopt)
1.142 dyoung 1838: {
1839: int error, prerr;
1.1 cgd 1840:
1.177 ad 1841: if (sopt->sopt_level == SOL_SOCKET) {
1.171 plunky 1842: error = sosetopt1(so, sopt);
1.177 ad 1843: KASSERT(solocked(so));
1844: } else {
1.142 dyoung 1845: error = ENOPROTOOPT;
1.177 ad 1846: solock(so);
1847: }
1.1 cgd 1848:
1.142 dyoung 1849: if ((error == 0 || error == ENOPROTOOPT) &&
1850: so->so_proto != NULL && so->so_proto->pr_ctloutput != NULL) {
1851: /* give the protocol stack a shot */
1.171 plunky 1852: prerr = (*so->so_proto->pr_ctloutput)(PRCO_SETOPT, so, sopt);
1.142 dyoung 1853: if (prerr == 0)
1854: error = 0;
1855: else if (prerr != ENOPROTOOPT)
1856: error = prerr;
1.171 plunky 1857: }
1.160 ad 1858: sounlock(so);
1.142 dyoung 1859: return error;
1.1 cgd 1860: }
1861:
1.171 plunky 1862: /*
1863: * so_setsockopt() is a wrapper providing a sockopt structure for sosetopt()
1864: */
1865: int
1866: so_setsockopt(struct lwp *l, struct socket *so, int level, int name,
1867: const void *val, size_t valsize)
1868: {
1869: struct sockopt sopt;
1870: int error;
1871:
1872: KASSERT(valsize == 0 || val != NULL);
1873:
1874: sockopt_init(&sopt, level, name, valsize);
1875: sockopt_set(&sopt, val, valsize);
1876:
1877: error = sosetopt(so, &sopt);
1878:
1879: sockopt_destroy(&sopt);
1880:
1881: return error;
1882: }
1.235.2.2! skrll 1883:
1.171 plunky 1884: /*
1885: * internal get SOL_SOCKET options
1886: */
1887: static int
1888: sogetopt1(struct socket *so, struct sockopt *sopt)
1889: {
1.179 christos 1890: int error, optval, opt;
1.171 plunky 1891: struct linger l;
1892: struct timeval tv;
1893:
1.179 christos 1894: switch ((opt = sopt->sopt_name)) {
1.171 plunky 1895:
1896: case SO_ACCEPTFILTER:
1.177 ad 1897: error = accept_filt_getopt(so, sopt);
1.171 plunky 1898: break;
1899:
1900: case SO_LINGER:
1901: l.l_onoff = (so->so_options & SO_LINGER) ? 1 : 0;
1902: l.l_linger = so->so_linger;
1903:
1904: error = sockopt_set(sopt, &l, sizeof(l));
1905: break;
1906:
1907: case SO_USELOOPBACK:
1908: case SO_DONTROUTE:
1909: case SO_DEBUG:
1910: case SO_KEEPALIVE:
1911: case SO_REUSEADDR:
1912: case SO_REUSEPORT:
1913: case SO_BROADCAST:
1914: case SO_OOBINLINE:
1915: case SO_TIMESTAMP:
1.207 christos 1916: case SO_NOSIGPIPE:
1.184 christos 1917: #ifdef SO_OTIMESTAMP
1918: case SO_OTIMESTAMP:
1919: #endif
1.218 seanb 1920: case SO_ACCEPTCONN:
1.179 christos 1921: error = sockopt_setint(sopt, (so->so_options & opt) ? 1 : 0);
1.171 plunky 1922: break;
1923:
1924: case SO_TYPE:
1925: error = sockopt_setint(sopt, so->so_type);
1926: break;
1927:
1928: case SO_ERROR:
1929: error = sockopt_setint(sopt, so->so_error);
1930: so->so_error = 0;
1931: break;
1932:
1933: case SO_SNDBUF:
1934: error = sockopt_setint(sopt, so->so_snd.sb_hiwat);
1935: break;
1936:
1937: case SO_RCVBUF:
1938: error = sockopt_setint(sopt, so->so_rcv.sb_hiwat);
1939: break;
1940:
1941: case SO_SNDLOWAT:
1942: error = sockopt_setint(sopt, so->so_snd.sb_lowat);
1943: break;
1944:
1945: case SO_RCVLOWAT:
1946: error = sockopt_setint(sopt, so->so_rcv.sb_lowat);
1947: break;
1948:
1.179 christos 1949: #ifdef COMPAT_50
1950: case SO_OSNDTIMEO:
1951: case SO_ORCVTIMEO: {
1952: struct timeval50 otv;
1953:
1954: optval = (opt == SO_OSNDTIMEO ?
1955: so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
1956:
1957: otv.tv_sec = optval / hz;
1958: otv.tv_usec = (optval % hz) * tick;
1959:
1960: error = sockopt_set(sopt, &otv, sizeof(otv));
1961: break;
1962: }
1963: #endif /* COMPAT_50 */
1964:
1.171 plunky 1965: case SO_SNDTIMEO:
1966: case SO_RCVTIMEO:
1.179 christos 1967: optval = (opt == SO_SNDTIMEO ?
1.171 plunky 1968: so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
1969:
1970: tv.tv_sec = optval / hz;
1971: tv.tv_usec = (optval % hz) * tick;
1972:
1973: error = sockopt_set(sopt, &tv, sizeof(tv));
1974: break;
1975:
1976: case SO_OVERFLOWED:
1977: error = sockopt_setint(sopt, so->so_rcv.sb_overflowed);
1978: break;
1979:
1980: default:
1981: error = ENOPROTOOPT;
1982: break;
1983: }
1984:
1985: return (error);
1986: }
1987:
1.14 mycroft 1988: int
1.171 plunky 1989: sogetopt(struct socket *so, struct sockopt *sopt)
1.1 cgd 1990: {
1.160 ad 1991: int error;
1.1 cgd 1992:
1.160 ad 1993: solock(so);
1.171 plunky 1994: if (sopt->sopt_level != SOL_SOCKET) {
1.1 cgd 1995: if (so->so_proto && so->so_proto->pr_ctloutput) {
1.160 ad 1996: error = ((*so->so_proto->pr_ctloutput)
1.171 plunky 1997: (PRCO_GETOPT, so, sopt));
1.1 cgd 1998: } else
1.160 ad 1999: error = (ENOPROTOOPT);
1.1 cgd 2000: } else {
1.171 plunky 2001: error = sogetopt1(so, sopt);
2002: }
2003: sounlock(so);
2004: return (error);
2005: }
2006:
2007: /*
2008: * alloc sockopt data buffer buffer
2009: * - will be released at destroy
2010: */
1.176 plunky 2011: static int
2012: sockopt_alloc(struct sockopt *sopt, size_t len, km_flag_t kmflag)
1.171 plunky 2013: {
2014:
2015: KASSERT(sopt->sopt_size == 0);
2016:
1.176 plunky 2017: if (len > sizeof(sopt->sopt_buf)) {
2018: sopt->sopt_data = kmem_zalloc(len, kmflag);
2019: if (sopt->sopt_data == NULL)
2020: return ENOMEM;
2021: } else
1.171 plunky 2022: sopt->sopt_data = sopt->sopt_buf;
2023:
2024: sopt->sopt_size = len;
1.176 plunky 2025: return 0;
1.171 plunky 2026: }
2027:
2028: /*
2029: * initialise sockopt storage
1.176 plunky 2030: * - MAY sleep during allocation
1.171 plunky 2031: */
2032: void
2033: sockopt_init(struct sockopt *sopt, int level, int name, size_t size)
2034: {
1.1 cgd 2035:
1.171 plunky 2036: memset(sopt, 0, sizeof(*sopt));
1.1 cgd 2037:
1.171 plunky 2038: sopt->sopt_level = level;
2039: sopt->sopt_name = name;
1.176 plunky 2040: (void)sockopt_alloc(sopt, size, KM_SLEEP);
1.171 plunky 2041: }
2042:
2043: /*
2044: * destroy sockopt storage
2045: * - will release any held memory references
2046: */
2047: void
2048: sockopt_destroy(struct sockopt *sopt)
2049: {
2050:
2051: if (sopt->sopt_data != sopt->sopt_buf)
1.173 plunky 2052: kmem_free(sopt->sopt_data, sopt->sopt_size);
1.171 plunky 2053:
2054: memset(sopt, 0, sizeof(*sopt));
2055: }
2056:
2057: /*
2058: * set sockopt value
2059: * - value is copied into sockopt
1.176 plunky 2060: * - memory is allocated when necessary, will not sleep
1.171 plunky 2061: */
2062: int
2063: sockopt_set(struct sockopt *sopt, const void *buf, size_t len)
2064: {
1.176 plunky 2065: int error;
1.171 plunky 2066:
1.176 plunky 2067: if (sopt->sopt_size == 0) {
2068: error = sockopt_alloc(sopt, len, KM_NOSLEEP);
2069: if (error)
2070: return error;
2071: }
1.171 plunky 2072:
2073: KASSERT(sopt->sopt_size == len);
2074: memcpy(sopt->sopt_data, buf, len);
2075: return 0;
2076: }
2077:
2078: /*
2079: * common case of set sockopt integer value
2080: */
2081: int
2082: sockopt_setint(struct sockopt *sopt, int val)
2083: {
2084:
2085: return sockopt_set(sopt, &val, sizeof(int));
2086: }
2087:
2088: /*
2089: * get sockopt value
2090: * - correct size must be given
2091: */
2092: int
2093: sockopt_get(const struct sockopt *sopt, void *buf, size_t len)
2094: {
1.170 tls 2095:
1.171 plunky 2096: if (sopt->sopt_size != len)
2097: return EINVAL;
1.1 cgd 2098:
1.171 plunky 2099: memcpy(buf, sopt->sopt_data, len);
2100: return 0;
2101: }
1.1 cgd 2102:
1.171 plunky 2103: /*
2104: * common case of get sockopt integer value
2105: */
2106: int
2107: sockopt_getint(const struct sockopt *sopt, int *valp)
2108: {
1.1 cgd 2109:
1.171 plunky 2110: return sockopt_get(sopt, valp, sizeof(int));
2111: }
1.1 cgd 2112:
1.171 plunky 2113: /*
2114: * set sockopt value from mbuf
2115: * - ONLY for legacy code
2116: * - mbuf is released by sockopt
1.176 plunky 2117: * - will not sleep
1.171 plunky 2118: */
2119: int
2120: sockopt_setmbuf(struct sockopt *sopt, struct mbuf *m)
2121: {
2122: size_t len;
1.176 plunky 2123: int error;
1.1 cgd 2124:
1.171 plunky 2125: len = m_length(m);
1.1 cgd 2126:
1.176 plunky 2127: if (sopt->sopt_size == 0) {
2128: error = sockopt_alloc(sopt, len, KM_NOSLEEP);
2129: if (error)
2130: return error;
2131: }
1.1 cgd 2132:
1.171 plunky 2133: KASSERT(sopt->sopt_size == len);
2134: m_copydata(m, 0, len, sopt->sopt_data);
2135: m_freem(m);
1.1 cgd 2136:
1.171 plunky 2137: return 0;
2138: }
1.1 cgd 2139:
1.171 plunky 2140: /*
2141: * get sockopt value into mbuf
2142: * - ONLY for legacy code
2143: * - mbuf to be released by the caller
1.176 plunky 2144: * - will not sleep
1.171 plunky 2145: */
2146: struct mbuf *
2147: sockopt_getmbuf(const struct sockopt *sopt)
2148: {
2149: struct mbuf *m;
1.107 darrenr 2150:
1.176 plunky 2151: if (sopt->sopt_size > MCLBYTES)
2152: return NULL;
2153:
2154: m = m_get(M_DONTWAIT, MT_SOOPTS);
1.171 plunky 2155: if (m == NULL)
2156: return NULL;
2157:
1.176 plunky 2158: if (sopt->sopt_size > MLEN) {
2159: MCLGET(m, M_DONTWAIT);
2160: if ((m->m_flags & M_EXT) == 0) {
2161: m_free(m);
2162: return NULL;
2163: }
1.1 cgd 2164: }
1.176 plunky 2165:
2166: memcpy(mtod(m, void *), sopt->sopt_data, sopt->sopt_size);
2167: m->m_len = sopt->sopt_size;
1.160 ad 2168:
1.171 plunky 2169: return m;
1.1 cgd 2170: }
2171:
1.14 mycroft 2172: void
1.54 lukem 2173: sohasoutofband(struct socket *so)
1.1 cgd 2174: {
1.153 rmind 2175:
1.90 christos 2176: fownsignal(so->so_pgid, SIGURG, POLL_PRI, POLLPRI|POLLRDBAND, so);
1.189 ad 2177: selnotify(&so->so_rcv.sb_sel, POLLPRI | POLLRDBAND, NOTE_SUBMIT);
1.1 cgd 2178: }
1.72 jdolecek 2179:
2180: static void
2181: filt_sordetach(struct knote *kn)
2182: {
2183: struct socket *so;
2184:
1.235 matt 2185: so = ((file_t *)kn->kn_obj)->f_socket;
1.160 ad 2186: solock(so);
1.73 christos 2187: SLIST_REMOVE(&so->so_rcv.sb_sel.sel_klist, kn, knote, kn_selnext);
2188: if (SLIST_EMPTY(&so->so_rcv.sb_sel.sel_klist))
1.72 jdolecek 2189: so->so_rcv.sb_flags &= ~SB_KNOTE;
1.160 ad 2190: sounlock(so);
1.72 jdolecek 2191: }
2192:
2193: /*ARGSUSED*/
2194: static int
1.129 yamt 2195: filt_soread(struct knote *kn, long hint)
1.72 jdolecek 2196: {
2197: struct socket *so;
1.160 ad 2198: int rv;
1.72 jdolecek 2199:
1.235 matt 2200: so = ((file_t *)kn->kn_obj)->f_socket;
1.160 ad 2201: if (hint != NOTE_SUBMIT)
2202: solock(so);
1.72 jdolecek 2203: kn->kn_data = so->so_rcv.sb_cc;
2204: if (so->so_state & SS_CANTRCVMORE) {
1.108 perry 2205: kn->kn_flags |= EV_EOF;
1.72 jdolecek 2206: kn->kn_fflags = so->so_error;
1.160 ad 2207: rv = 1;
2208: } else if (so->so_error) /* temporary udp error */
2209: rv = 1;
2210: else if (kn->kn_sfflags & NOTE_LOWAT)
2211: rv = (kn->kn_data >= kn->kn_sdata);
1.235.2.2! skrll 2212: else
1.160 ad 2213: rv = (kn->kn_data >= so->so_rcv.sb_lowat);
2214: if (hint != NOTE_SUBMIT)
2215: sounlock(so);
2216: return rv;
1.72 jdolecek 2217: }
2218:
2219: static void
2220: filt_sowdetach(struct knote *kn)
2221: {
2222: struct socket *so;
2223:
1.235 matt 2224: so = ((file_t *)kn->kn_obj)->f_socket;
1.160 ad 2225: solock(so);
1.73 christos 2226: SLIST_REMOVE(&so->so_snd.sb_sel.sel_klist, kn, knote, kn_selnext);
2227: if (SLIST_EMPTY(&so->so_snd.sb_sel.sel_klist))
1.72 jdolecek 2228: so->so_snd.sb_flags &= ~SB_KNOTE;
1.160 ad 2229: sounlock(so);
1.72 jdolecek 2230: }
2231:
2232: /*ARGSUSED*/
2233: static int
1.129 yamt 2234: filt_sowrite(struct knote *kn, long hint)
1.72 jdolecek 2235: {
2236: struct socket *so;
1.160 ad 2237: int rv;
1.72 jdolecek 2238:
1.235 matt 2239: so = ((file_t *)kn->kn_obj)->f_socket;
1.160 ad 2240: if (hint != NOTE_SUBMIT)
2241: solock(so);
1.72 jdolecek 2242: kn->kn_data = sbspace(&so->so_snd);
2243: if (so->so_state & SS_CANTSENDMORE) {
1.108 perry 2244: kn->kn_flags |= EV_EOF;
1.72 jdolecek 2245: kn->kn_fflags = so->so_error;
1.160 ad 2246: rv = 1;
2247: } else if (so->so_error) /* temporary udp error */
2248: rv = 1;
2249: else if (((so->so_state & SS_ISCONNECTED) == 0) &&
1.72 jdolecek 2250: (so->so_proto->pr_flags & PR_CONNREQUIRED))
1.160 ad 2251: rv = 0;
2252: else if (kn->kn_sfflags & NOTE_LOWAT)
2253: rv = (kn->kn_data >= kn->kn_sdata);
2254: else
2255: rv = (kn->kn_data >= so->so_snd.sb_lowat);
2256: if (hint != NOTE_SUBMIT)
2257: sounlock(so);
2258: return rv;
1.72 jdolecek 2259: }
2260:
2261: /*ARGSUSED*/
2262: static int
1.129 yamt 2263: filt_solisten(struct knote *kn, long hint)
1.72 jdolecek 2264: {
2265: struct socket *so;
1.160 ad 2266: int rv;
1.72 jdolecek 2267:
1.235 matt 2268: so = ((file_t *)kn->kn_obj)->f_socket;
1.72 jdolecek 2269:
2270: /*
2271: * Set kn_data to number of incoming connections, not
2272: * counting partial (incomplete) connections.
1.108 perry 2273: */
1.160 ad 2274: if (hint != NOTE_SUBMIT)
2275: solock(so);
1.72 jdolecek 2276: kn->kn_data = so->so_qlen;
1.160 ad 2277: rv = (kn->kn_data > 0);
2278: if (hint != NOTE_SUBMIT)
2279: sounlock(so);
2280: return rv;
1.72 jdolecek 2281: }
2282:
2283: static const struct filterops solisten_filtops =
2284: { 1, NULL, filt_sordetach, filt_solisten };
2285: static const struct filterops soread_filtops =
2286: { 1, NULL, filt_sordetach, filt_soread };
2287: static const struct filterops sowrite_filtops =
2288: { 1, NULL, filt_sowdetach, filt_sowrite };
2289:
2290: int
1.129 yamt 2291: soo_kqfilter(struct file *fp, struct knote *kn)
1.72 jdolecek 2292: {
2293: struct socket *so;
2294: struct sockbuf *sb;
2295:
1.235 matt 2296: so = ((file_t *)kn->kn_obj)->f_socket;
1.160 ad 2297: solock(so);
1.72 jdolecek 2298: switch (kn->kn_filter) {
2299: case EVFILT_READ:
2300: if (so->so_options & SO_ACCEPTCONN)
2301: kn->kn_fop = &solisten_filtops;
2302: else
2303: kn->kn_fop = &soread_filtops;
2304: sb = &so->so_rcv;
2305: break;
2306: case EVFILT_WRITE:
2307: kn->kn_fop = &sowrite_filtops;
2308: sb = &so->so_snd;
2309: break;
2310: default:
1.160 ad 2311: sounlock(so);
1.149 pooka 2312: return (EINVAL);
1.72 jdolecek 2313: }
1.73 christos 2314: SLIST_INSERT_HEAD(&sb->sb_sel.sel_klist, kn, kn_selnext);
1.72 jdolecek 2315: sb->sb_flags |= SB_KNOTE;
1.160 ad 2316: sounlock(so);
1.72 jdolecek 2317: return (0);
2318: }
2319:
1.154 ad 2320: static int
2321: sodopoll(struct socket *so, int events)
2322: {
2323: int revents;
2324:
2325: revents = 0;
2326:
2327: if (events & (POLLIN | POLLRDNORM))
2328: if (soreadable(so))
2329: revents |= events & (POLLIN | POLLRDNORM);
2330:
2331: if (events & (POLLOUT | POLLWRNORM))
2332: if (sowritable(so))
2333: revents |= events & (POLLOUT | POLLWRNORM);
2334:
2335: if (events & (POLLPRI | POLLRDBAND))
2336: if (so->so_oobmark || (so->so_state & SS_RCVATMARK))
2337: revents |= events & (POLLPRI | POLLRDBAND);
2338:
2339: return revents;
2340: }
2341:
2342: int
2343: sopoll(struct socket *so, int events)
2344: {
2345: int revents = 0;
2346:
1.160 ad 2347: #ifndef DIAGNOSTIC
2348: /*
2349: * Do a quick, unlocked check in expectation that the socket
2350: * will be ready for I/O. Don't do this check if DIAGNOSTIC,
2351: * as the solocked() assertions will fail.
2352: */
1.154 ad 2353: if ((revents = sodopoll(so, events)) != 0)
2354: return revents;
1.160 ad 2355: #endif
1.154 ad 2356:
1.160 ad 2357: solock(so);
1.154 ad 2358: if ((revents = sodopoll(so, events)) == 0) {
2359: if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
2360: selrecord(curlwp, &so->so_rcv.sb_sel);
1.160 ad 2361: so->so_rcv.sb_flags |= SB_NOTIFY;
1.154 ad 2362: }
2363:
2364: if (events & (POLLOUT | POLLWRNORM)) {
2365: selrecord(curlwp, &so->so_snd.sb_sel);
1.160 ad 2366: so->so_snd.sb_flags |= SB_NOTIFY;
1.154 ad 2367: }
2368: }
1.160 ad 2369: sounlock(so);
1.154 ad 2370:
2371: return revents;
2372: }
2373:
2374:
1.94 yamt 2375: #include <sys/sysctl.h>
2376:
2377: static int sysctl_kern_somaxkva(SYSCTLFN_PROTO);
1.212 pooka 2378: static int sysctl_kern_sbmax(SYSCTLFN_PROTO);
1.94 yamt 2379:
2380: /*
2381: * sysctl helper routine for kern.somaxkva. ensures that the given
2382: * value is not too small.
2383: * (XXX should we maybe make sure it's not too large as well?)
2384: */
2385: static int
2386: sysctl_kern_somaxkva(SYSCTLFN_ARGS)
2387: {
2388: int error, new_somaxkva;
2389: struct sysctlnode node;
2390:
2391: new_somaxkva = somaxkva;
2392: node = *rnode;
2393: node.sysctl_data = &new_somaxkva;
2394: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2395: if (error || newp == NULL)
2396: return (error);
2397:
2398: if (new_somaxkva < (16 * 1024 * 1024)) /* sanity */
2399: return (EINVAL);
2400:
1.136 ad 2401: mutex_enter(&so_pendfree_lock);
1.94 yamt 2402: somaxkva = new_somaxkva;
1.136 ad 2403: cv_broadcast(&socurkva_cv);
2404: mutex_exit(&so_pendfree_lock);
1.94 yamt 2405:
2406: return (error);
2407: }
2408:
1.212 pooka 2409: /*
2410: * sysctl helper routine for kern.sbmax. Basically just ensures that
2411: * any new value is not too small.
2412: */
2413: static int
2414: sysctl_kern_sbmax(SYSCTLFN_ARGS)
2415: {
2416: int error, new_sbmax;
2417: struct sysctlnode node;
2418:
2419: new_sbmax = sb_max;
2420: node = *rnode;
2421: node.sysctl_data = &new_sbmax;
2422: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2423: if (error || newp == NULL)
2424: return (error);
2425:
2426: KERNEL_LOCK(1, NULL);
2427: error = sb_max_set(new_sbmax);
2428: KERNEL_UNLOCK_ONE(NULL);
2429:
2430: return (error);
2431: }
2432:
1.178 pooka 2433: static void
1.212 pooka 2434: sysctl_kern_socket_setup(void)
1.94 yamt 2435: {
2436:
1.178 pooka 2437: KASSERT(socket_sysctllog == NULL);
1.97 atatat 2438:
1.178 pooka 2439: sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
1.97 atatat 2440: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.103 atatat 2441: CTLTYPE_INT, "somaxkva",
2442: SYSCTL_DESCR("Maximum amount of kernel memory to be "
2443: "used for socket buffers"),
1.94 yamt 2444: sysctl_kern_somaxkva, 0, NULL, 0,
2445: CTL_KERN, KERN_SOMAXKVA, CTL_EOL);
1.212 pooka 2446:
2447: sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
2448: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2449: CTLTYPE_INT, "sbmax",
2450: SYSCTL_DESCR("Maximum socket buffer size"),
2451: sysctl_kern_sbmax, 0, NULL, 0,
2452: CTL_KERN, KERN_SBMAX, CTL_EOL);
1.94 yamt 2453: }
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