Annotation of src/sys/kern/uipc_socket.c, Revision 1.236
1.236 ! rtr 1: /* $NetBSD: uipc_socket.c,v 1.235 2014/09/05 09:20:59 matt Exp $ */
1.64 thorpej 2:
3: /*-
1.188 ad 4: * Copyright (c) 2002, 2007, 2008, 2009 The NetBSD Foundation, Inc.
1.64 thorpej 5: * All rights reserved.
6: *
7: * This code is derived from software contributed to The NetBSD Foundation
1.188 ad 8: * by Jason R. Thorpe of Wasabi Systems, Inc, and by Andrew Doran.
1.64 thorpej 9: *
10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
13: * 1. Redistributions of source code must retain the above copyright
14: * notice, this list of conditions and the following disclaimer.
15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
17: * documentation and/or other materials provided with the distribution.
18: *
19: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29: * POSSIBILITY OF SUCH DAMAGE.
30: */
1.16 cgd 31:
1.1 cgd 32: /*
1.159 ad 33: * Copyright (c) 2004 The FreeBSD Foundation
34: * Copyright (c) 2004 Robert Watson
1.15 mycroft 35: * Copyright (c) 1982, 1986, 1988, 1990, 1993
36: * The Regents of the University of California. All rights reserved.
1.1 cgd 37: *
38: * Redistribution and use in source and binary forms, with or without
39: * modification, are permitted provided that the following conditions
40: * are met:
41: * 1. Redistributions of source code must retain the above copyright
42: * notice, this list of conditions and the following disclaimer.
43: * 2. Redistributions in binary form must reproduce the above copyright
44: * notice, this list of conditions and the following disclaimer in the
45: * documentation and/or other materials provided with the distribution.
1.85 agc 46: * 3. Neither the name of the University nor the names of its contributors
1.1 cgd 47: * may be used to endorse or promote products derived from this software
48: * without specific prior written permission.
49: *
50: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
51: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
52: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
53: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
54: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
55: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
56: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
57: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
58: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
59: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60: * SUCH DAMAGE.
61: *
1.32 fvdl 62: * @(#)uipc_socket.c 8.6 (Berkeley) 5/2/95
1.1 cgd 63: */
1.59 lukem 64:
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>
1.236 ! rtr 74: __KERNEL_RCSID(0, "$NetBSD: uipc_socket.c,v 1.235 2014/09/05 09:20:59 matt 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
1.236 ! rtr 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);
1.231 rtr 632: error = (*so->so_proto->pr_usrreqs->pr_bind)(so, nam, l);
1.160 ad 633: sounlock(so);
1.140 dyoung 634: return error;
1.1 cgd 635: }
636:
1.3 andrew 637: int
1.150 elad 638: solisten(struct socket *so, int backlog, struct lwp *l)
1.1 cgd 639: {
1.160 ad 640: int error;
1.1 cgd 641:
1.160 ad 642: solock(so);
1.158 ad 643: if ((so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING |
1.163 ad 644: SS_ISDISCONNECTING)) != 0) {
1.222 rmind 645: sounlock(so);
646: return EINVAL;
1.163 ad 647: }
1.231 rtr 648: error = (*so->so_proto->pr_usrreqs->pr_listen)(so, l);
1.140 dyoung 649: if (error != 0) {
1.160 ad 650: sounlock(so);
1.140 dyoung 651: return error;
1.1 cgd 652: }
1.63 matt 653: if (TAILQ_EMPTY(&so->so_q))
1.1 cgd 654: so->so_options |= SO_ACCEPTCONN;
655: if (backlog < 0)
656: backlog = 0;
1.49 jonathan 657: so->so_qlimit = min(backlog, somaxconn);
1.160 ad 658: sounlock(so);
1.140 dyoung 659: return 0;
1.1 cgd 660: }
661:
1.21 christos 662: void
1.54 lukem 663: sofree(struct socket *so)
1.1 cgd 664: {
1.161 ad 665: u_int refs;
1.1 cgd 666:
1.160 ad 667: KASSERT(solocked(so));
668:
669: if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0) {
670: sounlock(so);
1.1 cgd 671: return;
1.160 ad 672: }
1.43 mycroft 673: if (so->so_head) {
674: /*
675: * We must not decommission a socket that's on the accept(2)
676: * queue. If we do, then accept(2) may hang after select(2)
677: * indicated that the listening socket was ready.
678: */
1.160 ad 679: if (!soqremque(so, 0)) {
680: sounlock(so);
1.43 mycroft 681: return;
1.160 ad 682: }
1.43 mycroft 683: }
1.98 christos 684: if (so->so_rcv.sb_hiwat)
1.110 christos 685: (void)chgsbsize(so->so_uidinfo, &so->so_rcv.sb_hiwat, 0,
1.98 christos 686: RLIM_INFINITY);
687: if (so->so_snd.sb_hiwat)
1.110 christos 688: (void)chgsbsize(so->so_uidinfo, &so->so_snd.sb_hiwat, 0,
1.98 christos 689: RLIM_INFINITY);
690: sbrelease(&so->so_snd, so);
1.160 ad 691: KASSERT(!cv_has_waiters(&so->so_cv));
692: KASSERT(!cv_has_waiters(&so->so_rcv.sb_cv));
693: KASSERT(!cv_has_waiters(&so->so_snd.sb_cv));
1.1 cgd 694: sorflush(so);
1.161 ad 695: refs = so->so_aborting; /* XXX */
1.177 ad 696: /* Remove acccept filter if one is present. */
1.170 tls 697: if (so->so_accf != NULL)
1.177 ad 698: (void)accept_filt_clear(so);
1.160 ad 699: sounlock(so);
1.161 ad 700: if (refs == 0) /* XXX */
701: soput(so);
1.1 cgd 702: }
703:
704: /*
1.222 rmind 705: * soclose: close a socket on last file table reference removal.
706: * Initiate disconnect if connected. Free socket when disconnect complete.
1.1 cgd 707: */
1.3 andrew 708: int
1.54 lukem 709: soclose(struct socket *so)
1.1 cgd 710: {
1.222 rmind 711: struct socket *so2;
712: int error = 0;
1.1 cgd 713:
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: }
1.222 rmind 736: if (so->so_pcb == NULL)
1.1 cgd 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) {
1.224 rmind 757: KASSERT(solocked(so));
758: (*so->so_proto->pr_usrreqs->pr_detach)(so);
1.1 cgd 759: }
1.54 lukem 760: discard:
1.222 rmind 761: KASSERT((so->so_state & SS_NOFDREF) == 0);
1.198 elad 762: kauth_cred_free(so->so_cred);
1.1 cgd 763: so->so_state |= SS_NOFDREF;
764: sofree(so);
1.222 rmind 765: return error;
1.1 cgd 766: }
767:
768: /*
1.160 ad 769: * Must be called with the socket locked.. Will return with it unlocked.
1.1 cgd 770: */
1.3 andrew 771: int
1.54 lukem 772: soabort(struct socket *so)
1.1 cgd 773: {
1.161 ad 774: u_int refs;
1.139 yamt 775: int error;
1.160 ad 776:
777: KASSERT(solocked(so));
778: KASSERT(so->so_head == NULL);
1.1 cgd 779:
1.161 ad 780: so->so_aborting++; /* XXX */
1.230 mrg 781: error = (*so->so_proto->pr_usrreqs->pr_abort)(so);
1.161 ad 782: refs = --so->so_aborting; /* XXX */
1.164 drochner 783: if (error || (refs == 0)) {
1.139 yamt 784: sofree(so);
1.160 ad 785: } else {
786: sounlock(so);
1.139 yamt 787: }
788: return error;
1.1 cgd 789: }
790:
1.3 andrew 791: int
1.54 lukem 792: soaccept(struct socket *so, struct mbuf *nam)
1.1 cgd 793: {
1.222 rmind 794: int error;
1.160 ad 795:
796: KASSERT(solocked(so));
1.222 rmind 797: KASSERT((so->so_state & SS_NOFDREF) != 0);
1.1 cgd 798:
799: so->so_state &= ~SS_NOFDREF;
1.55 thorpej 800: if ((so->so_state & SS_ISDISCONNECTED) == 0 ||
801: (so->so_proto->pr_flags & PR_ABRTACPTDIS) == 0)
1.225 rtr 802: error = (*so->so_proto->pr_usrreqs->pr_accept)(so, nam);
1.41 mycroft 803: else
1.53 itojun 804: error = ECONNABORTED;
1.52 itojun 805:
1.222 rmind 806: return error;
1.1 cgd 807: }
808:
1.3 andrew 809: int
1.114 christos 810: soconnect(struct socket *so, struct mbuf *nam, struct lwp *l)
1.1 cgd 811: {
1.222 rmind 812: int error;
1.160 ad 813:
814: KASSERT(solocked(so));
1.1 cgd 815:
816: if (so->so_options & SO_ACCEPTCONN)
1.222 rmind 817: return EOPNOTSUPP;
1.1 cgd 818: /*
819: * If protocol is connection-based, can only connect once.
820: * Otherwise, if connected, try to disconnect first.
821: * This allows user to disconnect by connecting to, e.g.,
822: * a null address.
823: */
824: if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
825: ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
826: (error = sodisconnect(so))))
827: error = EISCONN;
828: else
1.231 rtr 829: error = (*so->so_proto->pr_usrreqs->pr_connect)(so, nam, l);
1.222 rmind 830:
831: return error;
1.1 cgd 832: }
833:
1.3 andrew 834: int
1.54 lukem 835: soconnect2(struct socket *so1, struct socket *so2)
1.1 cgd 836: {
1.160 ad 837: KASSERT(solocked2(so1, so2));
1.1 cgd 838:
1.234 rtr 839: return (*so1->so_proto->pr_usrreqs->pr_connect2)(so1, so2);
1.1 cgd 840: }
841:
1.3 andrew 842: int
1.54 lukem 843: sodisconnect(struct socket *so)
1.1 cgd 844: {
1.160 ad 845: int error;
846:
847: KASSERT(solocked(so));
1.1 cgd 848:
849: if ((so->so_state & SS_ISCONNECTED) == 0) {
850: error = ENOTCONN;
1.160 ad 851: } else if (so->so_state & SS_ISDISCONNECTING) {
1.1 cgd 852: error = EALREADY;
1.160 ad 853: } else {
1.229 rtr 854: error = (*so->so_proto->pr_usrreqs->pr_disconnect)(so);
1.1 cgd 855: }
856: return (error);
857: }
858:
1.15 mycroft 859: #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK)
1.1 cgd 860: /*
861: * Send on a socket.
862: * If send must go all at once and message is larger than
863: * send buffering, then hard error.
864: * Lock against other senders.
865: * If must go all at once and not enough room now, then
866: * inform user that this would block and do nothing.
867: * Otherwise, if nonblocking, send as much as possible.
868: * The data to be sent is described by "uio" if nonzero,
869: * otherwise by the mbuf chain "top" (which must be null
870: * if uio is not). Data provided in mbuf chain must be small
871: * enough to send all at once.
872: *
873: * Returns nonzero on error, timeout or signal; callers
874: * must check for short counts if EINTR/ERESTART are returned.
875: * Data and control buffers are freed on return.
876: */
1.3 andrew 877: int
1.54 lukem 878: sosend(struct socket *so, struct mbuf *addr, struct uio *uio, struct mbuf *top,
1.114 christos 879: struct mbuf *control, int flags, struct lwp *l)
1.1 cgd 880: {
1.54 lukem 881: struct mbuf **mp, *m;
1.58 jdolecek 882: long space, len, resid, clen, mlen;
883: int error, s, dontroute, atomic;
1.196 dsl 884: short wakeup_state = 0;
1.54 lukem 885:
1.160 ad 886: clen = 0;
1.64 thorpej 887:
1.160 ad 888: /*
889: * solock() provides atomicity of access. splsoftnet() prevents
890: * protocol processing soft interrupts from interrupting us and
891: * blocking (expensive).
892: */
893: s = splsoftnet();
894: solock(so);
1.54 lukem 895: atomic = sosendallatonce(so) || top;
1.1 cgd 896: if (uio)
897: resid = uio->uio_resid;
898: else
899: resid = top->m_pkthdr.len;
1.7 cgd 900: /*
901: * In theory resid should be unsigned.
902: * However, space must be signed, as it might be less than 0
903: * if we over-committed, and we must use a signed comparison
904: * of space and resid. On the other hand, a negative resid
905: * causes us to loop sending 0-length segments to the protocol.
906: */
1.29 mycroft 907: if (resid < 0) {
908: error = EINVAL;
909: goto out;
910: }
1.1 cgd 911: dontroute =
912: (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
913: (so->so_proto->pr_flags & PR_ATOMIC);
1.165 christos 914: l->l_ru.ru_msgsnd++;
1.1 cgd 915: if (control)
916: clen = control->m_len;
1.54 lukem 917: restart:
1.21 christos 918: if ((error = sblock(&so->so_snd, SBLOCKWAIT(flags))) != 0)
1.1 cgd 919: goto out;
920: do {
1.160 ad 921: if (so->so_state & SS_CANTSENDMORE) {
922: error = EPIPE;
923: goto release;
924: }
1.48 thorpej 925: if (so->so_error) {
926: error = so->so_error;
927: so->so_error = 0;
928: goto release;
929: }
1.1 cgd 930: if ((so->so_state & SS_ISCONNECTED) == 0) {
931: if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
1.217 rmind 932: if (resid || clen == 0) {
1.160 ad 933: error = ENOTCONN;
934: goto release;
935: }
936: } else if (addr == 0) {
937: error = EDESTADDRREQ;
938: goto release;
939: }
1.1 cgd 940: }
941: space = sbspace(&so->so_snd);
942: if (flags & MSG_OOB)
943: space += 1024;
1.21 christos 944: if ((atomic && resid > so->so_snd.sb_hiwat) ||
1.160 ad 945: clen > so->so_snd.sb_hiwat) {
946: error = EMSGSIZE;
947: goto release;
948: }
1.96 mycroft 949: if (space < resid + clen &&
1.1 cgd 950: (atomic || space < so->so_snd.sb_lowat || space < clen)) {
1.206 christos 951: if ((so->so_state & SS_NBIO) || (flags & MSG_NBIO)) {
1.160 ad 952: error = EWOULDBLOCK;
953: goto release;
954: }
1.1 cgd 955: sbunlock(&so->so_snd);
1.196 dsl 956: if (wakeup_state & SS_RESTARTSYS) {
957: error = ERESTART;
958: goto out;
959: }
1.1 cgd 960: error = sbwait(&so->so_snd);
961: if (error)
962: goto out;
1.196 dsl 963: wakeup_state = so->so_state;
1.1 cgd 964: goto restart;
965: }
1.196 dsl 966: wakeup_state = 0;
1.1 cgd 967: mp = ⊤
968: space -= clen;
969: do {
1.45 tv 970: if (uio == NULL) {
971: /*
972: * Data is prepackaged in "top".
973: */
974: resid = 0;
975: if (flags & MSG_EOR)
976: top->m_flags |= M_EOR;
977: } else do {
1.160 ad 978: sounlock(so);
979: splx(s);
1.144 dyoung 980: if (top == NULL) {
1.78 matt 981: m = m_gethdr(M_WAIT, MT_DATA);
1.45 tv 982: mlen = MHLEN;
983: m->m_pkthdr.len = 0;
1.140 dyoung 984: m->m_pkthdr.rcvif = NULL;
1.45 tv 985: } else {
1.78 matt 986: m = m_get(M_WAIT, MT_DATA);
1.45 tv 987: mlen = MLEN;
988: }
1.78 matt 989: MCLAIM(m, so->so_snd.sb_mowner);
1.121 yamt 990: if (sock_loan_thresh >= 0 &&
991: uio->uio_iov->iov_len >= sock_loan_thresh &&
992: space >= sock_loan_thresh &&
1.64 thorpej 993: (len = sosend_loan(so, uio, m,
994: space)) != 0) {
995: SOSEND_COUNTER_INCR(&sosend_loan_big);
996: space -= len;
997: goto have_data;
998: }
1.45 tv 999: if (resid >= MINCLSIZE && space >= MCLBYTES) {
1.64 thorpej 1000: SOSEND_COUNTER_INCR(&sosend_copy_big);
1.201 oki 1001: m_clget(m, M_DONTWAIT);
1.45 tv 1002: if ((m->m_flags & M_EXT) == 0)
1003: goto nopages;
1004: mlen = MCLBYTES;
1005: if (atomic && top == 0) {
1.58 jdolecek 1006: len = lmin(MCLBYTES - max_hdr,
1.54 lukem 1007: resid);
1.45 tv 1008: m->m_data += max_hdr;
1009: } else
1.58 jdolecek 1010: len = lmin(MCLBYTES, resid);
1.45 tv 1011: space -= len;
1012: } else {
1.64 thorpej 1013: nopages:
1014: SOSEND_COUNTER_INCR(&sosend_copy_small);
1.58 jdolecek 1015: len = lmin(lmin(mlen, resid), space);
1.45 tv 1016: space -= len;
1017: /*
1018: * For datagram protocols, leave room
1019: * for protocol headers in first mbuf.
1020: */
1021: if (atomic && top == 0 && len < mlen)
1022: MH_ALIGN(m, len);
1023: }
1.144 dyoung 1024: error = uiomove(mtod(m, void *), (int)len, uio);
1.64 thorpej 1025: have_data:
1.45 tv 1026: resid = uio->uio_resid;
1027: m->m_len = len;
1028: *mp = m;
1029: top->m_pkthdr.len += len;
1.160 ad 1030: s = splsoftnet();
1031: solock(so);
1.144 dyoung 1032: if (error != 0)
1.45 tv 1033: goto release;
1034: mp = &m->m_next;
1035: if (resid <= 0) {
1036: if (flags & MSG_EOR)
1037: top->m_flags |= M_EOR;
1038: break;
1039: }
1040: } while (space > 0 && atomic);
1.108 perry 1041:
1.160 ad 1042: if (so->so_state & SS_CANTSENDMORE) {
1043: error = EPIPE;
1044: goto release;
1045: }
1.45 tv 1046: if (dontroute)
1047: so->so_options |= SO_DONTROUTE;
1048: if (resid > 0)
1049: so->so_state |= SS_MORETOCOME;
1.226 rtr 1050: if (flags & MSG_OOB)
1051: error = (*so->so_proto->pr_usrreqs->pr_sendoob)(so,
1052: top, control);
1053: else
1.232 rtr 1054: error = (*so->so_proto->pr_usrreqs->pr_send)(so,
1055: top, addr, control, l);
1.45 tv 1056: if (dontroute)
1057: so->so_options &= ~SO_DONTROUTE;
1058: if (resid > 0)
1059: so->so_state &= ~SS_MORETOCOME;
1060: clen = 0;
1.144 dyoung 1061: control = NULL;
1062: top = NULL;
1.45 tv 1063: mp = ⊤
1.144 dyoung 1064: if (error != 0)
1.1 cgd 1065: goto release;
1066: } while (resid && space > 0);
1067: } while (resid);
1068:
1.54 lukem 1069: release:
1.1 cgd 1070: sbunlock(&so->so_snd);
1.54 lukem 1071: out:
1.160 ad 1072: sounlock(so);
1073: splx(s);
1.1 cgd 1074: if (top)
1075: m_freem(top);
1076: if (control)
1077: m_freem(control);
1078: return (error);
1079: }
1080:
1081: /*
1.159 ad 1082: * Following replacement or removal of the first mbuf on the first
1083: * mbuf chain of a socket buffer, push necessary state changes back
1084: * into the socket buffer so that other consumers see the values
1085: * consistently. 'nextrecord' is the callers locally stored value of
1086: * the original value of sb->sb_mb->m_nextpkt which must be restored
1087: * when the lead mbuf changes. NOTE: 'nextrecord' may be NULL.
1088: */
1089: static void
1090: sbsync(struct sockbuf *sb, struct mbuf *nextrecord)
1091: {
1092:
1.160 ad 1093: KASSERT(solocked(sb->sb_so));
1094:
1.159 ad 1095: /*
1096: * First, update for the new value of nextrecord. If necessary,
1097: * make it the first record.
1098: */
1099: if (sb->sb_mb != NULL)
1100: sb->sb_mb->m_nextpkt = nextrecord;
1101: else
1102: sb->sb_mb = nextrecord;
1103:
1104: /*
1105: * Now update any dependent socket buffer fields to reflect
1106: * the new state. This is an inline of SB_EMPTY_FIXUP, with
1107: * the addition of a second clause that takes care of the
1108: * case where sb_mb has been updated, but remains the last
1109: * record.
1110: */
1111: if (sb->sb_mb == NULL) {
1112: sb->sb_mbtail = NULL;
1113: sb->sb_lastrecord = NULL;
1114: } else if (sb->sb_mb->m_nextpkt == NULL)
1115: sb->sb_lastrecord = sb->sb_mb;
1116: }
1117:
1118: /*
1.1 cgd 1119: * Implement receive operations on a socket.
1120: * We depend on the way that records are added to the sockbuf
1121: * by sbappend*. In particular, each record (mbufs linked through m_next)
1122: * must begin with an address if the protocol so specifies,
1123: * followed by an optional mbuf or mbufs containing ancillary data,
1124: * and then zero or more mbufs of data.
1125: * In order to avoid blocking network interrupts for the entire time here,
1126: * we splx() while doing the actual copy to user space.
1127: * Although the sockbuf is locked, new data may still be appended,
1128: * and thus we must maintain consistency of the sockbuf during that time.
1129: *
1130: * The caller may receive the data as a single mbuf chain by supplying
1131: * an mbuf **mp0 for use in returning the chain. The uio is then used
1132: * only for the count in uio_resid.
1133: */
1.3 andrew 1134: int
1.54 lukem 1135: soreceive(struct socket *so, struct mbuf **paddr, struct uio *uio,
1136: struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
1.1 cgd 1137: {
1.116 yamt 1138: struct lwp *l = curlwp;
1.160 ad 1139: struct mbuf *m, **mp, *mt;
1.211 chs 1140: size_t len, offset, moff, orig_resid;
1141: int atomic, flags, error, s, type;
1.99 matt 1142: const struct protosw *pr;
1.54 lukem 1143: struct mbuf *nextrecord;
1.67 he 1144: int mbuf_removed = 0;
1.146 dyoung 1145: const struct domain *dom;
1.196 dsl 1146: short wakeup_state = 0;
1.64 thorpej 1147:
1.54 lukem 1148: pr = so->so_proto;
1.146 dyoung 1149: atomic = pr->pr_flags & PR_ATOMIC;
1150: dom = pr->pr_domain;
1.1 cgd 1151: mp = mp0;
1.54 lukem 1152: type = 0;
1153: orig_resid = uio->uio_resid;
1.102 jonathan 1154:
1.144 dyoung 1155: if (paddr != NULL)
1156: *paddr = NULL;
1157: if (controlp != NULL)
1158: *controlp = NULL;
1159: if (flagsp != NULL)
1.1 cgd 1160: flags = *flagsp &~ MSG_EOR;
1161: else
1162: flags = 0;
1.66 enami 1163:
1.1 cgd 1164: if (flags & MSG_OOB) {
1165: m = m_get(M_WAIT, MT_DATA);
1.160 ad 1166: solock(so);
1.226 rtr 1167: error = (*pr->pr_usrreqs->pr_recvoob)(so, m, flags & MSG_PEEK);
1.160 ad 1168: sounlock(so);
1.1 cgd 1169: if (error)
1170: goto bad;
1171: do {
1.134 christos 1172: error = uiomove(mtod(m, void *),
1.211 chs 1173: MIN(uio->uio_resid, m->m_len), uio);
1.1 cgd 1174: m = m_free(m);
1.144 dyoung 1175: } while (uio->uio_resid > 0 && error == 0 && m);
1.54 lukem 1176: bad:
1.144 dyoung 1177: if (m != NULL)
1.1 cgd 1178: m_freem(m);
1.144 dyoung 1179: return error;
1.1 cgd 1180: }
1.144 dyoung 1181: if (mp != NULL)
1.140 dyoung 1182: *mp = NULL;
1.160 ad 1183:
1184: /*
1185: * solock() provides atomicity of access. splsoftnet() prevents
1186: * protocol processing soft interrupts from interrupting us and
1187: * blocking (expensive).
1188: */
1189: s = splsoftnet();
1190: solock(so);
1.54 lukem 1191: restart:
1.160 ad 1192: if ((error = sblock(&so->so_rcv, SBLOCKWAIT(flags))) != 0) {
1193: sounlock(so);
1194: splx(s);
1.144 dyoung 1195: return error;
1.160 ad 1196: }
1.1 cgd 1197:
1198: m = so->so_rcv.sb_mb;
1199: /*
1200: * If we have less data than requested, block awaiting more
1201: * (subject to any timeout) if:
1.15 mycroft 1202: * 1. the current count is less than the low water mark,
1.1 cgd 1203: * 2. MSG_WAITALL is set, and it is possible to do the entire
1.15 mycroft 1204: * receive operation at once if we block (resid <= hiwat), or
1205: * 3. MSG_DONTWAIT is not set.
1.1 cgd 1206: * If MSG_WAITALL is set but resid is larger than the receive buffer,
1207: * we have to do the receive in sections, and thus risk returning
1208: * a short count if a timeout or signal occurs after we start.
1209: */
1.144 dyoung 1210: if (m == NULL ||
1211: ((flags & MSG_DONTWAIT) == 0 &&
1212: so->so_rcv.sb_cc < uio->uio_resid &&
1213: (so->so_rcv.sb_cc < so->so_rcv.sb_lowat ||
1214: ((flags & MSG_WAITALL) &&
1215: uio->uio_resid <= so->so_rcv.sb_hiwat)) &&
1.146 dyoung 1216: m->m_nextpkt == NULL && !atomic)) {
1.1 cgd 1217: #ifdef DIAGNOSTIC
1.144 dyoung 1218: if (m == NULL && so->so_rcv.sb_cc)
1.1 cgd 1219: panic("receive 1");
1220: #endif
1221: if (so->so_error) {
1.144 dyoung 1222: if (m != NULL)
1.15 mycroft 1223: goto dontblock;
1.1 cgd 1224: error = so->so_error;
1225: if ((flags & MSG_PEEK) == 0)
1226: so->so_error = 0;
1227: goto release;
1228: }
1229: if (so->so_state & SS_CANTRCVMORE) {
1.144 dyoung 1230: if (m != NULL)
1.15 mycroft 1231: goto dontblock;
1.1 cgd 1232: else
1233: goto release;
1234: }
1.144 dyoung 1235: for (; m != NULL; m = m->m_next)
1.1 cgd 1236: if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) {
1237: m = so->so_rcv.sb_mb;
1238: goto dontblock;
1239: }
1240: if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
1241: (so->so_proto->pr_flags & PR_CONNREQUIRED)) {
1242: error = ENOTCONN;
1243: goto release;
1244: }
1245: if (uio->uio_resid == 0)
1246: goto release;
1.206 christos 1247: if ((so->so_state & SS_NBIO) ||
1248: (flags & (MSG_DONTWAIT|MSG_NBIO))) {
1.1 cgd 1249: error = EWOULDBLOCK;
1250: goto release;
1251: }
1.69 thorpej 1252: SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 1");
1253: SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 1");
1.1 cgd 1254: sbunlock(&so->so_rcv);
1.196 dsl 1255: if (wakeup_state & SS_RESTARTSYS)
1256: error = ERESTART;
1257: else
1258: error = sbwait(&so->so_rcv);
1.160 ad 1259: if (error != 0) {
1260: sounlock(so);
1261: splx(s);
1.144 dyoung 1262: return error;
1.160 ad 1263: }
1.196 dsl 1264: wakeup_state = so->so_state;
1.1 cgd 1265: goto restart;
1266: }
1.54 lukem 1267: dontblock:
1.69 thorpej 1268: /*
1269: * On entry here, m points to the first record of the socket buffer.
1.159 ad 1270: * From this point onward, we maintain 'nextrecord' as a cache of the
1271: * pointer to the next record in the socket buffer. We must keep the
1272: * various socket buffer pointers and local stack versions of the
1273: * pointers in sync, pushing out modifications before dropping the
1.160 ad 1274: * socket lock, and re-reading them when picking it up.
1.159 ad 1275: *
1276: * Otherwise, we will race with the network stack appending new data
1277: * or records onto the socket buffer by using inconsistent/stale
1278: * versions of the field, possibly resulting in socket buffer
1279: * corruption.
1280: *
1281: * By holding the high-level sblock(), we prevent simultaneous
1282: * readers from pulling off the front of the socket buffer.
1.69 thorpej 1283: */
1.144 dyoung 1284: if (l != NULL)
1.157 ad 1285: l->l_ru.ru_msgrcv++;
1.69 thorpej 1286: KASSERT(m == so->so_rcv.sb_mb);
1287: SBLASTRECORDCHK(&so->so_rcv, "soreceive 1");
1288: SBLASTMBUFCHK(&so->so_rcv, "soreceive 1");
1.1 cgd 1289: nextrecord = m->m_nextpkt;
1290: if (pr->pr_flags & PR_ADDR) {
1291: #ifdef DIAGNOSTIC
1292: if (m->m_type != MT_SONAME)
1293: panic("receive 1a");
1294: #endif
1.3 andrew 1295: orig_resid = 0;
1.1 cgd 1296: if (flags & MSG_PEEK) {
1297: if (paddr)
1298: *paddr = m_copy(m, 0, m->m_len);
1299: m = m->m_next;
1300: } else {
1301: sbfree(&so->so_rcv, m);
1.67 he 1302: mbuf_removed = 1;
1.144 dyoung 1303: if (paddr != NULL) {
1.1 cgd 1304: *paddr = m;
1305: so->so_rcv.sb_mb = m->m_next;
1.144 dyoung 1306: m->m_next = NULL;
1.1 cgd 1307: m = so->so_rcv.sb_mb;
1308: } else {
1309: MFREE(m, so->so_rcv.sb_mb);
1310: m = so->so_rcv.sb_mb;
1311: }
1.159 ad 1312: sbsync(&so->so_rcv, nextrecord);
1.1 cgd 1313: }
1314: }
1.159 ad 1315:
1316: /*
1317: * Process one or more MT_CONTROL mbufs present before any data mbufs
1318: * in the first mbuf chain on the socket buffer. If MSG_PEEK, we
1319: * just copy the data; if !MSG_PEEK, we call into the protocol to
1320: * perform externalization (or freeing if controlp == NULL).
1321: */
1322: if (__predict_false(m != NULL && m->m_type == MT_CONTROL)) {
1323: struct mbuf *cm = NULL, *cmn;
1324: struct mbuf **cme = &cm;
1325:
1326: do {
1327: if (flags & MSG_PEEK) {
1328: if (controlp != NULL) {
1329: *controlp = m_copy(m, 0, m->m_len);
1330: controlp = &(*controlp)->m_next;
1331: }
1332: m = m->m_next;
1333: } else {
1334: sbfree(&so->so_rcv, m);
1.1 cgd 1335: so->so_rcv.sb_mb = m->m_next;
1.144 dyoung 1336: m->m_next = NULL;
1.159 ad 1337: *cme = m;
1338: cme = &(*cme)->m_next;
1.1 cgd 1339: m = so->so_rcv.sb_mb;
1.159 ad 1340: }
1341: } while (m != NULL && m->m_type == MT_CONTROL);
1342: if ((flags & MSG_PEEK) == 0)
1343: sbsync(&so->so_rcv, nextrecord);
1344: for (; cm != NULL; cm = cmn) {
1345: cmn = cm->m_next;
1346: cm->m_next = NULL;
1347: type = mtod(cm, struct cmsghdr *)->cmsg_type;
1348: if (controlp != NULL) {
1349: if (dom->dom_externalize != NULL &&
1350: type == SCM_RIGHTS) {
1.160 ad 1351: sounlock(so);
1.159 ad 1352: splx(s);
1.204 christos 1353: error = (*dom->dom_externalize)(cm, l,
1354: (flags & MSG_CMSG_CLOEXEC) ?
1355: O_CLOEXEC : 0);
1.159 ad 1356: s = splsoftnet();
1.160 ad 1357: solock(so);
1.159 ad 1358: }
1359: *controlp = cm;
1360: while (*controlp != NULL)
1361: controlp = &(*controlp)->m_next;
1.1 cgd 1362: } else {
1.106 itojun 1363: /*
1364: * Dispose of any SCM_RIGHTS message that went
1365: * through the read path rather than recv.
1366: */
1.159 ad 1367: if (dom->dom_dispose != NULL &&
1368: type == SCM_RIGHTS) {
1.160 ad 1369: sounlock(so);
1.159 ad 1370: (*dom->dom_dispose)(cm);
1.160 ad 1371: solock(so);
1.159 ad 1372: }
1373: m_freem(cm);
1.1 cgd 1374: }
1375: }
1.159 ad 1376: if (m != NULL)
1377: nextrecord = so->so_rcv.sb_mb->m_nextpkt;
1378: else
1379: nextrecord = so->so_rcv.sb_mb;
1380: orig_resid = 0;
1.1 cgd 1381: }
1.69 thorpej 1382:
1.159 ad 1383: /* If m is non-NULL, we have some data to read. */
1384: if (__predict_true(m != NULL)) {
1.1 cgd 1385: type = m->m_type;
1386: if (type == MT_OOBDATA)
1387: flags |= MSG_OOB;
1388: }
1.69 thorpej 1389: SBLASTRECORDCHK(&so->so_rcv, "soreceive 2");
1390: SBLASTMBUFCHK(&so->so_rcv, "soreceive 2");
1391:
1.1 cgd 1392: moff = 0;
1393: offset = 0;
1.144 dyoung 1394: while (m != NULL && uio->uio_resid > 0 && error == 0) {
1.1 cgd 1395: if (m->m_type == MT_OOBDATA) {
1396: if (type != MT_OOBDATA)
1397: break;
1398: } else if (type == MT_OOBDATA)
1399: break;
1400: #ifdef DIAGNOSTIC
1401: else if (m->m_type != MT_DATA && m->m_type != MT_HEADER)
1402: panic("receive 3");
1403: #endif
1404: so->so_state &= ~SS_RCVATMARK;
1.196 dsl 1405: wakeup_state = 0;
1.1 cgd 1406: len = uio->uio_resid;
1407: if (so->so_oobmark && len > so->so_oobmark - offset)
1408: len = so->so_oobmark - offset;
1409: if (len > m->m_len - moff)
1410: len = m->m_len - moff;
1411: /*
1412: * If mp is set, just pass back the mbufs.
1413: * Otherwise copy them out via the uio, then free.
1414: * Sockbuf must be consistent here (points to current mbuf,
1415: * it points to next record) when we drop priority;
1416: * we must note any additions to the sockbuf when we
1417: * block interrupts again.
1418: */
1.144 dyoung 1419: if (mp == NULL) {
1.69 thorpej 1420: SBLASTRECORDCHK(&so->so_rcv, "soreceive uiomove");
1421: SBLASTMBUFCHK(&so->so_rcv, "soreceive uiomove");
1.160 ad 1422: sounlock(so);
1.1 cgd 1423: splx(s);
1.211 chs 1424: error = uiomove(mtod(m, char *) + moff, len, uio);
1.20 mycroft 1425: s = splsoftnet();
1.160 ad 1426: solock(so);
1.144 dyoung 1427: if (error != 0) {
1.67 he 1428: /*
1429: * If any part of the record has been removed
1430: * (such as the MT_SONAME mbuf, which will
1431: * happen when PR_ADDR, and thus also
1432: * PR_ATOMIC, is set), then drop the entire
1433: * record to maintain the atomicity of the
1434: * receive operation.
1435: *
1436: * This avoids a later panic("receive 1a")
1437: * when compiled with DIAGNOSTIC.
1438: */
1.146 dyoung 1439: if (m && mbuf_removed && atomic)
1.67 he 1440: (void) sbdroprecord(&so->so_rcv);
1441:
1.57 jdolecek 1442: goto release;
1.67 he 1443: }
1.1 cgd 1444: } else
1445: uio->uio_resid -= len;
1446: if (len == m->m_len - moff) {
1447: if (m->m_flags & M_EOR)
1448: flags |= MSG_EOR;
1449: if (flags & MSG_PEEK) {
1450: m = m->m_next;
1451: moff = 0;
1452: } else {
1453: nextrecord = m->m_nextpkt;
1454: sbfree(&so->so_rcv, m);
1455: if (mp) {
1456: *mp = m;
1457: mp = &m->m_next;
1458: so->so_rcv.sb_mb = m = m->m_next;
1.140 dyoung 1459: *mp = NULL;
1.1 cgd 1460: } else {
1461: MFREE(m, so->so_rcv.sb_mb);
1462: m = so->so_rcv.sb_mb;
1463: }
1.69 thorpej 1464: /*
1465: * If m != NULL, we also know that
1466: * so->so_rcv.sb_mb != NULL.
1467: */
1468: KASSERT(so->so_rcv.sb_mb == m);
1469: if (m) {
1.1 cgd 1470: m->m_nextpkt = nextrecord;
1.69 thorpej 1471: if (nextrecord == NULL)
1472: so->so_rcv.sb_lastrecord = m;
1473: } else {
1474: so->so_rcv.sb_mb = nextrecord;
1.70 thorpej 1475: SB_EMPTY_FIXUP(&so->so_rcv);
1.69 thorpej 1476: }
1477: SBLASTRECORDCHK(&so->so_rcv, "soreceive 3");
1478: SBLASTMBUFCHK(&so->so_rcv, "soreceive 3");
1.1 cgd 1479: }
1.144 dyoung 1480: } else if (flags & MSG_PEEK)
1481: moff += len;
1482: else {
1.160 ad 1483: if (mp != NULL) {
1484: mt = m_copym(m, 0, len, M_NOWAIT);
1485: if (__predict_false(mt == NULL)) {
1486: sounlock(so);
1487: mt = m_copym(m, 0, len, M_WAIT);
1488: solock(so);
1489: }
1490: *mp = mt;
1491: }
1.144 dyoung 1492: m->m_data += len;
1493: m->m_len -= len;
1494: so->so_rcv.sb_cc -= len;
1.1 cgd 1495: }
1496: if (so->so_oobmark) {
1497: if ((flags & MSG_PEEK) == 0) {
1498: so->so_oobmark -= len;
1499: if (so->so_oobmark == 0) {
1500: so->so_state |= SS_RCVATMARK;
1501: break;
1502: }
1.7 cgd 1503: } else {
1.1 cgd 1504: offset += len;
1.7 cgd 1505: if (offset == so->so_oobmark)
1506: break;
1507: }
1.1 cgd 1508: }
1509: if (flags & MSG_EOR)
1510: break;
1511: /*
1512: * If the MSG_WAITALL flag is set (for non-atomic socket),
1513: * we must not quit until "uio->uio_resid == 0" or an error
1514: * termination. If a signal/timeout occurs, return
1515: * with a short count but without error.
1516: * Keep sockbuf locked against other readers.
1517: */
1.144 dyoung 1518: while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 &&
1.3 andrew 1519: !sosendallatonce(so) && !nextrecord) {
1.1 cgd 1520: if (so->so_error || so->so_state & SS_CANTRCVMORE)
1521: break;
1.68 matt 1522: /*
1523: * If we are peeking and the socket receive buffer is
1524: * full, stop since we can't get more data to peek at.
1525: */
1526: if ((flags & MSG_PEEK) && sbspace(&so->so_rcv) <= 0)
1527: break;
1528: /*
1529: * If we've drained the socket buffer, tell the
1530: * protocol in case it needs to do something to
1531: * get it filled again.
1532: */
1533: if ((pr->pr_flags & PR_WANTRCVD) && so->so_pcb)
1.233 rtr 1534: (*pr->pr_usrreqs->pr_rcvd)(so, flags, l);
1.69 thorpej 1535: SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 2");
1536: SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 2");
1.196 dsl 1537: if (wakeup_state & SS_RESTARTSYS)
1538: error = ERESTART;
1539: else
1540: error = sbwait(&so->so_rcv);
1.144 dyoung 1541: if (error != 0) {
1.1 cgd 1542: sbunlock(&so->so_rcv);
1.160 ad 1543: sounlock(so);
1.1 cgd 1544: splx(s);
1.144 dyoung 1545: return 0;
1.1 cgd 1546: }
1.21 christos 1547: if ((m = so->so_rcv.sb_mb) != NULL)
1.1 cgd 1548: nextrecord = m->m_nextpkt;
1.196 dsl 1549: wakeup_state = so->so_state;
1.1 cgd 1550: }
1551: }
1.3 andrew 1552:
1.146 dyoung 1553: if (m && atomic) {
1.3 andrew 1554: flags |= MSG_TRUNC;
1555: if ((flags & MSG_PEEK) == 0)
1556: (void) sbdroprecord(&so->so_rcv);
1557: }
1.1 cgd 1558: if ((flags & MSG_PEEK) == 0) {
1.144 dyoung 1559: if (m == NULL) {
1.69 thorpej 1560: /*
1.70 thorpej 1561: * First part is an inline SB_EMPTY_FIXUP(). Second
1.69 thorpej 1562: * part makes sure sb_lastrecord is up-to-date if
1563: * there is still data in the socket buffer.
1564: */
1.1 cgd 1565: so->so_rcv.sb_mb = nextrecord;
1.69 thorpej 1566: if (so->so_rcv.sb_mb == NULL) {
1567: so->so_rcv.sb_mbtail = NULL;
1568: so->so_rcv.sb_lastrecord = NULL;
1569: } else if (nextrecord->m_nextpkt == NULL)
1570: so->so_rcv.sb_lastrecord = nextrecord;
1571: }
1572: SBLASTRECORDCHK(&so->so_rcv, "soreceive 4");
1573: SBLASTMBUFCHK(&so->so_rcv, "soreceive 4");
1.1 cgd 1574: if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
1.233 rtr 1575: (*pr->pr_usrreqs->pr_rcvd)(so, flags, l);
1.1 cgd 1576: }
1.3 andrew 1577: if (orig_resid == uio->uio_resid && orig_resid &&
1578: (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) {
1579: sbunlock(&so->so_rcv);
1580: goto restart;
1581: }
1.108 perry 1582:
1.144 dyoung 1583: if (flagsp != NULL)
1.1 cgd 1584: *flagsp |= flags;
1.54 lukem 1585: release:
1.1 cgd 1586: sbunlock(&so->so_rcv);
1.160 ad 1587: sounlock(so);
1.1 cgd 1588: splx(s);
1.144 dyoung 1589: return error;
1.1 cgd 1590: }
1591:
1.14 mycroft 1592: int
1.54 lukem 1593: soshutdown(struct socket *so, int how)
1.1 cgd 1594: {
1.99 matt 1595: const struct protosw *pr;
1.160 ad 1596: int error;
1597:
1598: KASSERT(solocked(so));
1.34 kleink 1599:
1.54 lukem 1600: pr = so->so_proto;
1.34 kleink 1601: if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR))
1602: return (EINVAL);
1.1 cgd 1603:
1.160 ad 1604: if (how == SHUT_RD || how == SHUT_RDWR) {
1.1 cgd 1605: sorflush(so);
1.160 ad 1606: error = 0;
1607: }
1.34 kleink 1608: if (how == SHUT_WR || how == SHUT_RDWR)
1.229 rtr 1609: error = (*pr->pr_usrreqs->pr_shutdown)(so);
1.160 ad 1610:
1611: return error;
1.1 cgd 1612: }
1613:
1.195 dsl 1614: void
1.196 dsl 1615: sorestart(struct socket *so)
1.188 ad 1616: {
1.196 dsl 1617: /*
1618: * An application has called close() on an fd on which another
1619: * of its threads has called a socket system call.
1620: * Mark this and wake everyone up, and code that would block again
1621: * instead returns ERESTART.
1622: * On system call re-entry the fd is validated and EBADF returned.
1623: * Any other fd will block again on the 2nd syscall.
1624: */
1.188 ad 1625: solock(so);
1.196 dsl 1626: so->so_state |= SS_RESTARTSYS;
1.188 ad 1627: cv_broadcast(&so->so_cv);
1.196 dsl 1628: cv_broadcast(&so->so_snd.sb_cv);
1629: cv_broadcast(&so->so_rcv.sb_cv);
1.188 ad 1630: sounlock(so);
1631: }
1632:
1.14 mycroft 1633: void
1.54 lukem 1634: sorflush(struct socket *so)
1.1 cgd 1635: {
1.54 lukem 1636: struct sockbuf *sb, asb;
1.99 matt 1637: const struct protosw *pr;
1.160 ad 1638:
1639: KASSERT(solocked(so));
1.1 cgd 1640:
1.54 lukem 1641: sb = &so->so_rcv;
1642: pr = so->so_proto;
1.160 ad 1643: socantrcvmore(so);
1.1 cgd 1644: sb->sb_flags |= SB_NOINTR;
1.160 ad 1645: (void )sblock(sb, M_WAITOK);
1.1 cgd 1646: sbunlock(sb);
1647: asb = *sb;
1.86 wrstuden 1648: /*
1649: * Clear most of the sockbuf structure, but leave some of the
1650: * fields valid.
1651: */
1652: memset(&sb->sb_startzero, 0,
1653: sizeof(*sb) - offsetof(struct sockbuf, sb_startzero));
1.160 ad 1654: if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose) {
1655: sounlock(so);
1.1 cgd 1656: (*pr->pr_domain->dom_dispose)(asb.sb_mb);
1.160 ad 1657: solock(so);
1658: }
1.98 christos 1659: sbrelease(&asb, so);
1.1 cgd 1660: }
1661:
1.171 plunky 1662: /*
1663: * internal set SOL_SOCKET options
1664: */
1.142 dyoung 1665: static int
1.171 plunky 1666: sosetopt1(struct socket *so, const struct sockopt *sopt)
1.1 cgd 1667: {
1.219 christos 1668: int error = EINVAL, opt;
1669: int optval = 0; /* XXX: gcc */
1.171 plunky 1670: struct linger l;
1671: struct timeval tv;
1.142 dyoung 1672:
1.179 christos 1673: switch ((opt = sopt->sopt_name)) {
1.142 dyoung 1674:
1.170 tls 1675: case SO_ACCEPTFILTER:
1.177 ad 1676: error = accept_filt_setopt(so, sopt);
1677: KASSERT(solocked(so));
1.170 tls 1678: break;
1679:
1.171 plunky 1680: case SO_LINGER:
1681: error = sockopt_get(sopt, &l, sizeof(l));
1.177 ad 1682: solock(so);
1.171 plunky 1683: if (error)
1.177 ad 1684: break;
1.171 plunky 1685: if (l.l_linger < 0 || l.l_linger > USHRT_MAX ||
1.177 ad 1686: l.l_linger > (INT_MAX / hz)) {
1687: error = EDOM;
1688: break;
1689: }
1.171 plunky 1690: so->so_linger = l.l_linger;
1691: if (l.l_onoff)
1692: so->so_options |= SO_LINGER;
1693: else
1694: so->so_options &= ~SO_LINGER;
1.177 ad 1695: break;
1.1 cgd 1696:
1.142 dyoung 1697: case SO_DEBUG:
1698: case SO_KEEPALIVE:
1699: case SO_DONTROUTE:
1700: case SO_USELOOPBACK:
1701: case SO_BROADCAST:
1702: case SO_REUSEADDR:
1703: case SO_REUSEPORT:
1704: case SO_OOBINLINE:
1705: case SO_TIMESTAMP:
1.207 christos 1706: case SO_NOSIGPIPE:
1.184 christos 1707: #ifdef SO_OTIMESTAMP
1708: case SO_OTIMESTAMP:
1709: #endif
1.171 plunky 1710: error = sockopt_getint(sopt, &optval);
1.177 ad 1711: solock(so);
1.171 plunky 1712: if (error)
1.177 ad 1713: break;
1.171 plunky 1714: if (optval)
1.179 christos 1715: so->so_options |= opt;
1.142 dyoung 1716: else
1.179 christos 1717: so->so_options &= ~opt;
1.142 dyoung 1718: break;
1719:
1720: case SO_SNDBUF:
1721: case SO_RCVBUF:
1722: case SO_SNDLOWAT:
1723: case SO_RCVLOWAT:
1.171 plunky 1724: error = sockopt_getint(sopt, &optval);
1.177 ad 1725: solock(so);
1.171 plunky 1726: if (error)
1.177 ad 1727: break;
1.1 cgd 1728:
1.142 dyoung 1729: /*
1730: * Values < 1 make no sense for any of these
1731: * options, so disallow them.
1732: */
1.177 ad 1733: if (optval < 1) {
1734: error = EINVAL;
1735: break;
1736: }
1.1 cgd 1737:
1.179 christos 1738: switch (opt) {
1.171 plunky 1739: case SO_SNDBUF:
1.177 ad 1740: if (sbreserve(&so->so_snd, (u_long)optval, so) == 0) {
1741: error = ENOBUFS;
1742: break;
1743: }
1.171 plunky 1744: so->so_snd.sb_flags &= ~SB_AUTOSIZE;
1745: break;
1.1 cgd 1746:
1747: case SO_RCVBUF:
1.177 ad 1748: if (sbreserve(&so->so_rcv, (u_long)optval, so) == 0) {
1749: error = ENOBUFS;
1750: break;
1751: }
1.171 plunky 1752: so->so_rcv.sb_flags &= ~SB_AUTOSIZE;
1.142 dyoung 1753: break;
1754:
1755: /*
1756: * Make sure the low-water is never greater than
1757: * the high-water.
1758: */
1.1 cgd 1759: case SO_SNDLOWAT:
1.171 plunky 1760: if (optval > so->so_snd.sb_hiwat)
1761: optval = so->so_snd.sb_hiwat;
1762:
1763: so->so_snd.sb_lowat = optval;
1.142 dyoung 1764: break;
1.171 plunky 1765:
1.1 cgd 1766: case SO_RCVLOWAT:
1.171 plunky 1767: if (optval > so->so_rcv.sb_hiwat)
1768: optval = so->so_rcv.sb_hiwat;
1769:
1770: so->so_rcv.sb_lowat = optval;
1.142 dyoung 1771: break;
1772: }
1773: break;
1.28 thorpej 1774:
1.179 christos 1775: #ifdef COMPAT_50
1776: case SO_OSNDTIMEO:
1777: case SO_ORCVTIMEO: {
1778: struct timeval50 otv;
1779: error = sockopt_get(sopt, &otv, sizeof(otv));
1.186 pooka 1780: if (error) {
1781: solock(so);
1.183 christos 1782: break;
1.186 pooka 1783: }
1.179 christos 1784: timeval50_to_timeval(&otv, &tv);
1785: opt = opt == SO_OSNDTIMEO ? SO_SNDTIMEO : SO_RCVTIMEO;
1.182 christos 1786: error = 0;
1.179 christos 1787: /*FALLTHROUGH*/
1788: }
1789: #endif /* COMPAT_50 */
1790:
1.142 dyoung 1791: case SO_SNDTIMEO:
1792: case SO_RCVTIMEO:
1.182 christos 1793: if (error)
1.179 christos 1794: error = sockopt_get(sopt, &tv, sizeof(tv));
1.177 ad 1795: solock(so);
1.171 plunky 1796: if (error)
1.177 ad 1797: break;
1.171 plunky 1798:
1.177 ad 1799: if (tv.tv_sec > (INT_MAX - tv.tv_usec / tick) / hz) {
1800: error = EDOM;
1801: break;
1802: }
1.28 thorpej 1803:
1.171 plunky 1804: optval = tv.tv_sec * hz + tv.tv_usec / tick;
1805: if (optval == 0 && tv.tv_usec != 0)
1806: optval = 1;
1.28 thorpej 1807:
1.179 christos 1808: switch (opt) {
1.142 dyoung 1809: case SO_SNDTIMEO:
1.171 plunky 1810: so->so_snd.sb_timeo = optval;
1.1 cgd 1811: break;
1812: case SO_RCVTIMEO:
1.171 plunky 1813: so->so_rcv.sb_timeo = optval;
1.142 dyoung 1814: break;
1815: }
1816: break;
1.1 cgd 1817:
1.142 dyoung 1818: default:
1.177 ad 1819: solock(so);
1820: error = ENOPROTOOPT;
1821: break;
1.142 dyoung 1822: }
1.177 ad 1823: KASSERT(solocked(so));
1824: return error;
1.142 dyoung 1825: }
1.1 cgd 1826:
1.142 dyoung 1827: int
1.171 plunky 1828: sosetopt(struct socket *so, struct sockopt *sopt)
1.142 dyoung 1829: {
1830: int error, prerr;
1.1 cgd 1831:
1.177 ad 1832: if (sopt->sopt_level == SOL_SOCKET) {
1.171 plunky 1833: error = sosetopt1(so, sopt);
1.177 ad 1834: KASSERT(solocked(so));
1835: } else {
1.142 dyoung 1836: error = ENOPROTOOPT;
1.177 ad 1837: solock(so);
1838: }
1.1 cgd 1839:
1.142 dyoung 1840: if ((error == 0 || error == ENOPROTOOPT) &&
1841: so->so_proto != NULL && so->so_proto->pr_ctloutput != NULL) {
1842: /* give the protocol stack a shot */
1.171 plunky 1843: prerr = (*so->so_proto->pr_ctloutput)(PRCO_SETOPT, so, sopt);
1.142 dyoung 1844: if (prerr == 0)
1845: error = 0;
1846: else if (prerr != ENOPROTOOPT)
1847: error = prerr;
1.171 plunky 1848: }
1.160 ad 1849: sounlock(so);
1.142 dyoung 1850: return error;
1.1 cgd 1851: }
1852:
1.171 plunky 1853: /*
1854: * so_setsockopt() is a wrapper providing a sockopt structure for sosetopt()
1855: */
1856: int
1857: so_setsockopt(struct lwp *l, struct socket *so, int level, int name,
1858: const void *val, size_t valsize)
1859: {
1860: struct sockopt sopt;
1861: int error;
1862:
1863: KASSERT(valsize == 0 || val != NULL);
1864:
1865: sockopt_init(&sopt, level, name, valsize);
1866: sockopt_set(&sopt, val, valsize);
1867:
1868: error = sosetopt(so, &sopt);
1869:
1870: sockopt_destroy(&sopt);
1871:
1872: return error;
1873: }
1874:
1875: /*
1876: * internal get SOL_SOCKET options
1877: */
1878: static int
1879: sogetopt1(struct socket *so, struct sockopt *sopt)
1880: {
1.179 christos 1881: int error, optval, opt;
1.171 plunky 1882: struct linger l;
1883: struct timeval tv;
1884:
1.179 christos 1885: switch ((opt = sopt->sopt_name)) {
1.171 plunky 1886:
1887: case SO_ACCEPTFILTER:
1.177 ad 1888: error = accept_filt_getopt(so, sopt);
1.171 plunky 1889: break;
1890:
1891: case SO_LINGER:
1892: l.l_onoff = (so->so_options & SO_LINGER) ? 1 : 0;
1893: l.l_linger = so->so_linger;
1894:
1895: error = sockopt_set(sopt, &l, sizeof(l));
1896: break;
1897:
1898: case SO_USELOOPBACK:
1899: case SO_DONTROUTE:
1900: case SO_DEBUG:
1901: case SO_KEEPALIVE:
1902: case SO_REUSEADDR:
1903: case SO_REUSEPORT:
1904: case SO_BROADCAST:
1905: case SO_OOBINLINE:
1906: case SO_TIMESTAMP:
1.207 christos 1907: case SO_NOSIGPIPE:
1.184 christos 1908: #ifdef SO_OTIMESTAMP
1909: case SO_OTIMESTAMP:
1910: #endif
1.218 seanb 1911: case SO_ACCEPTCONN:
1.179 christos 1912: error = sockopt_setint(sopt, (so->so_options & opt) ? 1 : 0);
1.171 plunky 1913: break;
1914:
1915: case SO_TYPE:
1916: error = sockopt_setint(sopt, so->so_type);
1917: break;
1918:
1919: case SO_ERROR:
1920: error = sockopt_setint(sopt, so->so_error);
1921: so->so_error = 0;
1922: break;
1923:
1924: case SO_SNDBUF:
1925: error = sockopt_setint(sopt, so->so_snd.sb_hiwat);
1926: break;
1927:
1928: case SO_RCVBUF:
1929: error = sockopt_setint(sopt, so->so_rcv.sb_hiwat);
1930: break;
1931:
1932: case SO_SNDLOWAT:
1933: error = sockopt_setint(sopt, so->so_snd.sb_lowat);
1934: break;
1935:
1936: case SO_RCVLOWAT:
1937: error = sockopt_setint(sopt, so->so_rcv.sb_lowat);
1938: break;
1939:
1.179 christos 1940: #ifdef COMPAT_50
1941: case SO_OSNDTIMEO:
1942: case SO_ORCVTIMEO: {
1943: struct timeval50 otv;
1944:
1945: optval = (opt == SO_OSNDTIMEO ?
1946: so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
1947:
1948: otv.tv_sec = optval / hz;
1949: otv.tv_usec = (optval % hz) * tick;
1950:
1951: error = sockopt_set(sopt, &otv, sizeof(otv));
1952: break;
1953: }
1954: #endif /* COMPAT_50 */
1955:
1.171 plunky 1956: case SO_SNDTIMEO:
1957: case SO_RCVTIMEO:
1.179 christos 1958: optval = (opt == SO_SNDTIMEO ?
1.171 plunky 1959: so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
1960:
1961: tv.tv_sec = optval / hz;
1962: tv.tv_usec = (optval % hz) * tick;
1963:
1964: error = sockopt_set(sopt, &tv, sizeof(tv));
1965: break;
1966:
1967: case SO_OVERFLOWED:
1968: error = sockopt_setint(sopt, so->so_rcv.sb_overflowed);
1969: break;
1970:
1971: default:
1972: error = ENOPROTOOPT;
1973: break;
1974: }
1975:
1976: return (error);
1977: }
1978:
1.14 mycroft 1979: int
1.171 plunky 1980: sogetopt(struct socket *so, struct sockopt *sopt)
1.1 cgd 1981: {
1.160 ad 1982: int error;
1.1 cgd 1983:
1.160 ad 1984: solock(so);
1.171 plunky 1985: if (sopt->sopt_level != SOL_SOCKET) {
1.1 cgd 1986: if (so->so_proto && so->so_proto->pr_ctloutput) {
1.160 ad 1987: error = ((*so->so_proto->pr_ctloutput)
1.171 plunky 1988: (PRCO_GETOPT, so, sopt));
1.1 cgd 1989: } else
1.160 ad 1990: error = (ENOPROTOOPT);
1.1 cgd 1991: } else {
1.171 plunky 1992: error = sogetopt1(so, sopt);
1993: }
1994: sounlock(so);
1995: return (error);
1996: }
1997:
1998: /*
1999: * alloc sockopt data buffer buffer
2000: * - will be released at destroy
2001: */
1.176 plunky 2002: static int
2003: sockopt_alloc(struct sockopt *sopt, size_t len, km_flag_t kmflag)
1.171 plunky 2004: {
2005:
2006: KASSERT(sopt->sopt_size == 0);
2007:
1.176 plunky 2008: if (len > sizeof(sopt->sopt_buf)) {
2009: sopt->sopt_data = kmem_zalloc(len, kmflag);
2010: if (sopt->sopt_data == NULL)
2011: return ENOMEM;
2012: } else
1.171 plunky 2013: sopt->sopt_data = sopt->sopt_buf;
2014:
2015: sopt->sopt_size = len;
1.176 plunky 2016: return 0;
1.171 plunky 2017: }
2018:
2019: /*
2020: * initialise sockopt storage
1.176 plunky 2021: * - MAY sleep during allocation
1.171 plunky 2022: */
2023: void
2024: sockopt_init(struct sockopt *sopt, int level, int name, size_t size)
2025: {
1.1 cgd 2026:
1.171 plunky 2027: memset(sopt, 0, sizeof(*sopt));
1.1 cgd 2028:
1.171 plunky 2029: sopt->sopt_level = level;
2030: sopt->sopt_name = name;
1.176 plunky 2031: (void)sockopt_alloc(sopt, size, KM_SLEEP);
1.171 plunky 2032: }
2033:
2034: /*
2035: * destroy sockopt storage
2036: * - will release any held memory references
2037: */
2038: void
2039: sockopt_destroy(struct sockopt *sopt)
2040: {
2041:
2042: if (sopt->sopt_data != sopt->sopt_buf)
1.173 plunky 2043: kmem_free(sopt->sopt_data, sopt->sopt_size);
1.171 plunky 2044:
2045: memset(sopt, 0, sizeof(*sopt));
2046: }
2047:
2048: /*
2049: * set sockopt value
2050: * - value is copied into sockopt
1.176 plunky 2051: * - memory is allocated when necessary, will not sleep
1.171 plunky 2052: */
2053: int
2054: sockopt_set(struct sockopt *sopt, const void *buf, size_t len)
2055: {
1.176 plunky 2056: int error;
1.171 plunky 2057:
1.176 plunky 2058: if (sopt->sopt_size == 0) {
2059: error = sockopt_alloc(sopt, len, KM_NOSLEEP);
2060: if (error)
2061: return error;
2062: }
1.171 plunky 2063:
2064: KASSERT(sopt->sopt_size == len);
2065: memcpy(sopt->sopt_data, buf, len);
2066: return 0;
2067: }
2068:
2069: /*
2070: * common case of set sockopt integer value
2071: */
2072: int
2073: sockopt_setint(struct sockopt *sopt, int val)
2074: {
2075:
2076: return sockopt_set(sopt, &val, sizeof(int));
2077: }
2078:
2079: /*
2080: * get sockopt value
2081: * - correct size must be given
2082: */
2083: int
2084: sockopt_get(const struct sockopt *sopt, void *buf, size_t len)
2085: {
1.170 tls 2086:
1.171 plunky 2087: if (sopt->sopt_size != len)
2088: return EINVAL;
1.1 cgd 2089:
1.171 plunky 2090: memcpy(buf, sopt->sopt_data, len);
2091: return 0;
2092: }
1.1 cgd 2093:
1.171 plunky 2094: /*
2095: * common case of get sockopt integer value
2096: */
2097: int
2098: sockopt_getint(const struct sockopt *sopt, int *valp)
2099: {
1.1 cgd 2100:
1.171 plunky 2101: return sockopt_get(sopt, valp, sizeof(int));
2102: }
1.1 cgd 2103:
1.171 plunky 2104: /*
2105: * set sockopt value from mbuf
2106: * - ONLY for legacy code
2107: * - mbuf is released by sockopt
1.176 plunky 2108: * - will not sleep
1.171 plunky 2109: */
2110: int
2111: sockopt_setmbuf(struct sockopt *sopt, struct mbuf *m)
2112: {
2113: size_t len;
1.176 plunky 2114: int error;
1.1 cgd 2115:
1.171 plunky 2116: len = m_length(m);
1.1 cgd 2117:
1.176 plunky 2118: if (sopt->sopt_size == 0) {
2119: error = sockopt_alloc(sopt, len, KM_NOSLEEP);
2120: if (error)
2121: return error;
2122: }
1.1 cgd 2123:
1.171 plunky 2124: KASSERT(sopt->sopt_size == len);
2125: m_copydata(m, 0, len, sopt->sopt_data);
2126: m_freem(m);
1.1 cgd 2127:
1.171 plunky 2128: return 0;
2129: }
1.1 cgd 2130:
1.171 plunky 2131: /*
2132: * get sockopt value into mbuf
2133: * - ONLY for legacy code
2134: * - mbuf to be released by the caller
1.176 plunky 2135: * - will not sleep
1.171 plunky 2136: */
2137: struct mbuf *
2138: sockopt_getmbuf(const struct sockopt *sopt)
2139: {
2140: struct mbuf *m;
1.107 darrenr 2141:
1.176 plunky 2142: if (sopt->sopt_size > MCLBYTES)
2143: return NULL;
2144:
2145: m = m_get(M_DONTWAIT, MT_SOOPTS);
1.171 plunky 2146: if (m == NULL)
2147: return NULL;
2148:
1.176 plunky 2149: if (sopt->sopt_size > MLEN) {
2150: MCLGET(m, M_DONTWAIT);
2151: if ((m->m_flags & M_EXT) == 0) {
2152: m_free(m);
2153: return NULL;
2154: }
1.1 cgd 2155: }
1.176 plunky 2156:
2157: memcpy(mtod(m, void *), sopt->sopt_data, sopt->sopt_size);
2158: m->m_len = sopt->sopt_size;
1.160 ad 2159:
1.171 plunky 2160: return m;
1.1 cgd 2161: }
2162:
1.14 mycroft 2163: void
1.54 lukem 2164: sohasoutofband(struct socket *so)
1.1 cgd 2165: {
1.153 rmind 2166:
1.90 christos 2167: fownsignal(so->so_pgid, SIGURG, POLL_PRI, POLLPRI|POLLRDBAND, so);
1.189 ad 2168: selnotify(&so->so_rcv.sb_sel, POLLPRI | POLLRDBAND, NOTE_SUBMIT);
1.1 cgd 2169: }
1.72 jdolecek 2170:
2171: static void
2172: filt_sordetach(struct knote *kn)
2173: {
2174: struct socket *so;
2175:
1.235 matt 2176: so = ((file_t *)kn->kn_obj)->f_socket;
1.160 ad 2177: solock(so);
1.73 christos 2178: SLIST_REMOVE(&so->so_rcv.sb_sel.sel_klist, kn, knote, kn_selnext);
2179: if (SLIST_EMPTY(&so->so_rcv.sb_sel.sel_klist))
1.72 jdolecek 2180: so->so_rcv.sb_flags &= ~SB_KNOTE;
1.160 ad 2181: sounlock(so);
1.72 jdolecek 2182: }
2183:
2184: /*ARGSUSED*/
2185: static int
1.129 yamt 2186: filt_soread(struct knote *kn, long hint)
1.72 jdolecek 2187: {
2188: struct socket *so;
1.160 ad 2189: int rv;
1.72 jdolecek 2190:
1.235 matt 2191: so = ((file_t *)kn->kn_obj)->f_socket;
1.160 ad 2192: if (hint != NOTE_SUBMIT)
2193: solock(so);
1.72 jdolecek 2194: kn->kn_data = so->so_rcv.sb_cc;
2195: if (so->so_state & SS_CANTRCVMORE) {
1.108 perry 2196: kn->kn_flags |= EV_EOF;
1.72 jdolecek 2197: kn->kn_fflags = so->so_error;
1.160 ad 2198: rv = 1;
2199: } else if (so->so_error) /* temporary udp error */
2200: rv = 1;
2201: else if (kn->kn_sfflags & NOTE_LOWAT)
2202: rv = (kn->kn_data >= kn->kn_sdata);
2203: else
2204: rv = (kn->kn_data >= so->so_rcv.sb_lowat);
2205: if (hint != NOTE_SUBMIT)
2206: sounlock(so);
2207: return rv;
1.72 jdolecek 2208: }
2209:
2210: static void
2211: filt_sowdetach(struct knote *kn)
2212: {
2213: struct socket *so;
2214:
1.235 matt 2215: so = ((file_t *)kn->kn_obj)->f_socket;
1.160 ad 2216: solock(so);
1.73 christos 2217: SLIST_REMOVE(&so->so_snd.sb_sel.sel_klist, kn, knote, kn_selnext);
2218: if (SLIST_EMPTY(&so->so_snd.sb_sel.sel_klist))
1.72 jdolecek 2219: so->so_snd.sb_flags &= ~SB_KNOTE;
1.160 ad 2220: sounlock(so);
1.72 jdolecek 2221: }
2222:
2223: /*ARGSUSED*/
2224: static int
1.129 yamt 2225: filt_sowrite(struct knote *kn, long hint)
1.72 jdolecek 2226: {
2227: struct socket *so;
1.160 ad 2228: int rv;
1.72 jdolecek 2229:
1.235 matt 2230: so = ((file_t *)kn->kn_obj)->f_socket;
1.160 ad 2231: if (hint != NOTE_SUBMIT)
2232: solock(so);
1.72 jdolecek 2233: kn->kn_data = sbspace(&so->so_snd);
2234: if (so->so_state & SS_CANTSENDMORE) {
1.108 perry 2235: kn->kn_flags |= EV_EOF;
1.72 jdolecek 2236: kn->kn_fflags = so->so_error;
1.160 ad 2237: rv = 1;
2238: } else if (so->so_error) /* temporary udp error */
2239: rv = 1;
2240: else if (((so->so_state & SS_ISCONNECTED) == 0) &&
1.72 jdolecek 2241: (so->so_proto->pr_flags & PR_CONNREQUIRED))
1.160 ad 2242: rv = 0;
2243: else if (kn->kn_sfflags & NOTE_LOWAT)
2244: rv = (kn->kn_data >= kn->kn_sdata);
2245: else
2246: rv = (kn->kn_data >= so->so_snd.sb_lowat);
2247: if (hint != NOTE_SUBMIT)
2248: sounlock(so);
2249: return rv;
1.72 jdolecek 2250: }
2251:
2252: /*ARGSUSED*/
2253: static int
1.129 yamt 2254: filt_solisten(struct knote *kn, long hint)
1.72 jdolecek 2255: {
2256: struct socket *so;
1.160 ad 2257: int rv;
1.72 jdolecek 2258:
1.235 matt 2259: so = ((file_t *)kn->kn_obj)->f_socket;
1.72 jdolecek 2260:
2261: /*
2262: * Set kn_data to number of incoming connections, not
2263: * counting partial (incomplete) connections.
1.108 perry 2264: */
1.160 ad 2265: if (hint != NOTE_SUBMIT)
2266: solock(so);
1.72 jdolecek 2267: kn->kn_data = so->so_qlen;
1.160 ad 2268: rv = (kn->kn_data > 0);
2269: if (hint != NOTE_SUBMIT)
2270: sounlock(so);
2271: return rv;
1.72 jdolecek 2272: }
2273:
2274: static const struct filterops solisten_filtops =
2275: { 1, NULL, filt_sordetach, filt_solisten };
2276: static const struct filterops soread_filtops =
2277: { 1, NULL, filt_sordetach, filt_soread };
2278: static const struct filterops sowrite_filtops =
2279: { 1, NULL, filt_sowdetach, filt_sowrite };
2280:
2281: int
1.129 yamt 2282: soo_kqfilter(struct file *fp, struct knote *kn)
1.72 jdolecek 2283: {
2284: struct socket *so;
2285: struct sockbuf *sb;
2286:
1.235 matt 2287: so = ((file_t *)kn->kn_obj)->f_socket;
1.160 ad 2288: solock(so);
1.72 jdolecek 2289: switch (kn->kn_filter) {
2290: case EVFILT_READ:
2291: if (so->so_options & SO_ACCEPTCONN)
2292: kn->kn_fop = &solisten_filtops;
2293: else
2294: kn->kn_fop = &soread_filtops;
2295: sb = &so->so_rcv;
2296: break;
2297: case EVFILT_WRITE:
2298: kn->kn_fop = &sowrite_filtops;
2299: sb = &so->so_snd;
2300: break;
2301: default:
1.160 ad 2302: sounlock(so);
1.149 pooka 2303: return (EINVAL);
1.72 jdolecek 2304: }
1.73 christos 2305: SLIST_INSERT_HEAD(&sb->sb_sel.sel_klist, kn, kn_selnext);
1.72 jdolecek 2306: sb->sb_flags |= SB_KNOTE;
1.160 ad 2307: sounlock(so);
1.72 jdolecek 2308: return (0);
2309: }
2310:
1.154 ad 2311: static int
2312: sodopoll(struct socket *so, int events)
2313: {
2314: int revents;
2315:
2316: revents = 0;
2317:
2318: if (events & (POLLIN | POLLRDNORM))
2319: if (soreadable(so))
2320: revents |= events & (POLLIN | POLLRDNORM);
2321:
2322: if (events & (POLLOUT | POLLWRNORM))
2323: if (sowritable(so))
2324: revents |= events & (POLLOUT | POLLWRNORM);
2325:
2326: if (events & (POLLPRI | POLLRDBAND))
2327: if (so->so_oobmark || (so->so_state & SS_RCVATMARK))
2328: revents |= events & (POLLPRI | POLLRDBAND);
2329:
2330: return revents;
2331: }
2332:
2333: int
2334: sopoll(struct socket *so, int events)
2335: {
2336: int revents = 0;
2337:
1.160 ad 2338: #ifndef DIAGNOSTIC
2339: /*
2340: * Do a quick, unlocked check in expectation that the socket
2341: * will be ready for I/O. Don't do this check if DIAGNOSTIC,
2342: * as the solocked() assertions will fail.
2343: */
1.154 ad 2344: if ((revents = sodopoll(so, events)) != 0)
2345: return revents;
1.160 ad 2346: #endif
1.154 ad 2347:
1.160 ad 2348: solock(so);
1.154 ad 2349: if ((revents = sodopoll(so, events)) == 0) {
2350: if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
2351: selrecord(curlwp, &so->so_rcv.sb_sel);
1.160 ad 2352: so->so_rcv.sb_flags |= SB_NOTIFY;
1.154 ad 2353: }
2354:
2355: if (events & (POLLOUT | POLLWRNORM)) {
2356: selrecord(curlwp, &so->so_snd.sb_sel);
1.160 ad 2357: so->so_snd.sb_flags |= SB_NOTIFY;
1.154 ad 2358: }
2359: }
1.160 ad 2360: sounlock(so);
1.154 ad 2361:
2362: return revents;
2363: }
2364:
2365:
1.94 yamt 2366: #include <sys/sysctl.h>
2367:
2368: static int sysctl_kern_somaxkva(SYSCTLFN_PROTO);
1.212 pooka 2369: static int sysctl_kern_sbmax(SYSCTLFN_PROTO);
1.94 yamt 2370:
2371: /*
2372: * sysctl helper routine for kern.somaxkva. ensures that the given
2373: * value is not too small.
2374: * (XXX should we maybe make sure it's not too large as well?)
2375: */
2376: static int
2377: sysctl_kern_somaxkva(SYSCTLFN_ARGS)
2378: {
2379: int error, new_somaxkva;
2380: struct sysctlnode node;
2381:
2382: new_somaxkva = somaxkva;
2383: node = *rnode;
2384: node.sysctl_data = &new_somaxkva;
2385: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2386: if (error || newp == NULL)
2387: return (error);
2388:
2389: if (new_somaxkva < (16 * 1024 * 1024)) /* sanity */
2390: return (EINVAL);
2391:
1.136 ad 2392: mutex_enter(&so_pendfree_lock);
1.94 yamt 2393: somaxkva = new_somaxkva;
1.136 ad 2394: cv_broadcast(&socurkva_cv);
2395: mutex_exit(&so_pendfree_lock);
1.94 yamt 2396:
2397: return (error);
2398: }
2399:
1.212 pooka 2400: /*
2401: * sysctl helper routine for kern.sbmax. Basically just ensures that
2402: * any new value is not too small.
2403: */
2404: static int
2405: sysctl_kern_sbmax(SYSCTLFN_ARGS)
2406: {
2407: int error, new_sbmax;
2408: struct sysctlnode node;
2409:
2410: new_sbmax = sb_max;
2411: node = *rnode;
2412: node.sysctl_data = &new_sbmax;
2413: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2414: if (error || newp == NULL)
2415: return (error);
2416:
2417: KERNEL_LOCK(1, NULL);
2418: error = sb_max_set(new_sbmax);
2419: KERNEL_UNLOCK_ONE(NULL);
2420:
2421: return (error);
2422: }
2423:
1.178 pooka 2424: static void
1.212 pooka 2425: sysctl_kern_socket_setup(void)
1.94 yamt 2426: {
2427:
1.178 pooka 2428: KASSERT(socket_sysctllog == NULL);
1.97 atatat 2429:
1.178 pooka 2430: sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
1.97 atatat 2431: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.103 atatat 2432: CTLTYPE_INT, "somaxkva",
2433: SYSCTL_DESCR("Maximum amount of kernel memory to be "
2434: "used for socket buffers"),
1.94 yamt 2435: sysctl_kern_somaxkva, 0, NULL, 0,
2436: CTL_KERN, KERN_SOMAXKVA, CTL_EOL);
1.212 pooka 2437:
2438: sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
2439: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2440: CTLTYPE_INT, "sbmax",
2441: SYSCTL_DESCR("Maximum socket buffer size"),
2442: sysctl_kern_sbmax, 0, NULL, 0,
2443: CTL_KERN, KERN_SBMAX, CTL_EOL);
1.94 yamt 2444: }
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