Annotation of src/sys/kern/uipc_socket.c, Revision 1.233
1.233 ! rtr 1: /* $NetBSD: uipc_socket.c,v 1.232 2014/08/05 07:55:31 rtr 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>
1.233 ! rtr 74: __KERNEL_RCSID(0, "$NetBSD: uipc_socket.c,v 1.232 2014/08/05 07:55:31 rtr 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: }
603: fp->f_data = so;
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
1.114 christos 627: sobind(struct socket *so, struct mbuf *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:
1.223 rmind 839: return (*so1->so_proto->pr_usrreqs->pr_generic)(so1,
840: PRU_CONNECT2, NULL, (struct mbuf *)so2, NULL, NULL);
1.1 cgd 841: }
842:
1.3 andrew 843: int
1.54 lukem 844: sodisconnect(struct socket *so)
1.1 cgd 845: {
1.160 ad 846: int error;
847:
848: KASSERT(solocked(so));
1.1 cgd 849:
850: if ((so->so_state & SS_ISCONNECTED) == 0) {
851: error = ENOTCONN;
1.160 ad 852: } else if (so->so_state & SS_ISDISCONNECTING) {
1.1 cgd 853: error = EALREADY;
1.160 ad 854: } else {
1.229 rtr 855: error = (*so->so_proto->pr_usrreqs->pr_disconnect)(so);
1.1 cgd 856: }
857: return (error);
858: }
859:
1.15 mycroft 860: #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK)
1.1 cgd 861: /*
862: * Send on a socket.
863: * If send must go all at once and message is larger than
864: * send buffering, then hard error.
865: * Lock against other senders.
866: * If must go all at once and not enough room now, then
867: * inform user that this would block and do nothing.
868: * Otherwise, if nonblocking, send as much as possible.
869: * The data to be sent is described by "uio" if nonzero,
870: * otherwise by the mbuf chain "top" (which must be null
871: * if uio is not). Data provided in mbuf chain must be small
872: * enough to send all at once.
873: *
874: * Returns nonzero on error, timeout or signal; callers
875: * must check for short counts if EINTR/ERESTART are returned.
876: * Data and control buffers are freed on return.
877: */
1.3 andrew 878: int
1.54 lukem 879: sosend(struct socket *so, struct mbuf *addr, struct uio *uio, struct mbuf *top,
1.114 christos 880: struct mbuf *control, int flags, struct lwp *l)
1.1 cgd 881: {
1.54 lukem 882: struct mbuf **mp, *m;
1.58 jdolecek 883: long space, len, resid, clen, mlen;
884: int error, s, dontroute, atomic;
1.196 dsl 885: short wakeup_state = 0;
1.54 lukem 886:
1.160 ad 887: clen = 0;
1.64 thorpej 888:
1.160 ad 889: /*
890: * solock() provides atomicity of access. splsoftnet() prevents
891: * protocol processing soft interrupts from interrupting us and
892: * blocking (expensive).
893: */
894: s = splsoftnet();
895: solock(so);
1.54 lukem 896: atomic = sosendallatonce(so) || top;
1.1 cgd 897: if (uio)
898: resid = uio->uio_resid;
899: else
900: resid = top->m_pkthdr.len;
1.7 cgd 901: /*
902: * In theory resid should be unsigned.
903: * However, space must be signed, as it might be less than 0
904: * if we over-committed, and we must use a signed comparison
905: * of space and resid. On the other hand, a negative resid
906: * causes us to loop sending 0-length segments to the protocol.
907: */
1.29 mycroft 908: if (resid < 0) {
909: error = EINVAL;
910: goto out;
911: }
1.1 cgd 912: dontroute =
913: (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
914: (so->so_proto->pr_flags & PR_ATOMIC);
1.165 christos 915: l->l_ru.ru_msgsnd++;
1.1 cgd 916: if (control)
917: clen = control->m_len;
1.54 lukem 918: restart:
1.21 christos 919: if ((error = sblock(&so->so_snd, SBLOCKWAIT(flags))) != 0)
1.1 cgd 920: goto out;
921: do {
1.160 ad 922: if (so->so_state & SS_CANTSENDMORE) {
923: error = EPIPE;
924: goto release;
925: }
1.48 thorpej 926: if (so->so_error) {
927: error = so->so_error;
928: so->so_error = 0;
929: goto release;
930: }
1.1 cgd 931: if ((so->so_state & SS_ISCONNECTED) == 0) {
932: if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
1.217 rmind 933: if (resid || clen == 0) {
1.160 ad 934: error = ENOTCONN;
935: goto release;
936: }
937: } else if (addr == 0) {
938: error = EDESTADDRREQ;
939: goto release;
940: }
1.1 cgd 941: }
942: space = sbspace(&so->so_snd);
943: if (flags & MSG_OOB)
944: space += 1024;
1.21 christos 945: if ((atomic && resid > so->so_snd.sb_hiwat) ||
1.160 ad 946: clen > so->so_snd.sb_hiwat) {
947: error = EMSGSIZE;
948: goto release;
949: }
1.96 mycroft 950: if (space < resid + clen &&
1.1 cgd 951: (atomic || space < so->so_snd.sb_lowat || space < clen)) {
1.206 christos 952: if ((so->so_state & SS_NBIO) || (flags & MSG_NBIO)) {
1.160 ad 953: error = EWOULDBLOCK;
954: goto release;
955: }
1.1 cgd 956: sbunlock(&so->so_snd);
1.196 dsl 957: if (wakeup_state & SS_RESTARTSYS) {
958: error = ERESTART;
959: goto out;
960: }
1.1 cgd 961: error = sbwait(&so->so_snd);
962: if (error)
963: goto out;
1.196 dsl 964: wakeup_state = so->so_state;
1.1 cgd 965: goto restart;
966: }
1.196 dsl 967: wakeup_state = 0;
1.1 cgd 968: mp = ⊤
969: space -= clen;
970: do {
1.45 tv 971: if (uio == NULL) {
972: /*
973: * Data is prepackaged in "top".
974: */
975: resid = 0;
976: if (flags & MSG_EOR)
977: top->m_flags |= M_EOR;
978: } else do {
1.160 ad 979: sounlock(so);
980: splx(s);
1.144 dyoung 981: if (top == NULL) {
1.78 matt 982: m = m_gethdr(M_WAIT, MT_DATA);
1.45 tv 983: mlen = MHLEN;
984: m->m_pkthdr.len = 0;
1.140 dyoung 985: m->m_pkthdr.rcvif = NULL;
1.45 tv 986: } else {
1.78 matt 987: m = m_get(M_WAIT, MT_DATA);
1.45 tv 988: mlen = MLEN;
989: }
1.78 matt 990: MCLAIM(m, so->so_snd.sb_mowner);
1.121 yamt 991: if (sock_loan_thresh >= 0 &&
992: uio->uio_iov->iov_len >= sock_loan_thresh &&
993: space >= sock_loan_thresh &&
1.64 thorpej 994: (len = sosend_loan(so, uio, m,
995: space)) != 0) {
996: SOSEND_COUNTER_INCR(&sosend_loan_big);
997: space -= len;
998: goto have_data;
999: }
1.45 tv 1000: if (resid >= MINCLSIZE && space >= MCLBYTES) {
1.64 thorpej 1001: SOSEND_COUNTER_INCR(&sosend_copy_big);
1.201 oki 1002: m_clget(m, M_DONTWAIT);
1.45 tv 1003: if ((m->m_flags & M_EXT) == 0)
1004: goto nopages;
1005: mlen = MCLBYTES;
1006: if (atomic && top == 0) {
1.58 jdolecek 1007: len = lmin(MCLBYTES - max_hdr,
1.54 lukem 1008: resid);
1.45 tv 1009: m->m_data += max_hdr;
1010: } else
1.58 jdolecek 1011: len = lmin(MCLBYTES, resid);
1.45 tv 1012: space -= len;
1013: } else {
1.64 thorpej 1014: nopages:
1015: SOSEND_COUNTER_INCR(&sosend_copy_small);
1.58 jdolecek 1016: len = lmin(lmin(mlen, resid), space);
1.45 tv 1017: space -= len;
1018: /*
1019: * For datagram protocols, leave room
1020: * for protocol headers in first mbuf.
1021: */
1022: if (atomic && top == 0 && len < mlen)
1023: MH_ALIGN(m, len);
1024: }
1.144 dyoung 1025: error = uiomove(mtod(m, void *), (int)len, uio);
1.64 thorpej 1026: have_data:
1.45 tv 1027: resid = uio->uio_resid;
1028: m->m_len = len;
1029: *mp = m;
1030: top->m_pkthdr.len += len;
1.160 ad 1031: s = splsoftnet();
1032: solock(so);
1.144 dyoung 1033: if (error != 0)
1.45 tv 1034: goto release;
1035: mp = &m->m_next;
1036: if (resid <= 0) {
1037: if (flags & MSG_EOR)
1038: top->m_flags |= M_EOR;
1039: break;
1040: }
1041: } while (space > 0 && atomic);
1.108 perry 1042:
1.160 ad 1043: if (so->so_state & SS_CANTSENDMORE) {
1044: error = EPIPE;
1045: goto release;
1046: }
1.45 tv 1047: if (dontroute)
1048: so->so_options |= SO_DONTROUTE;
1049: if (resid > 0)
1050: so->so_state |= SS_MORETOCOME;
1.226 rtr 1051: if (flags & MSG_OOB)
1052: error = (*so->so_proto->pr_usrreqs->pr_sendoob)(so,
1053: top, control);
1054: else
1.232 rtr 1055: error = (*so->so_proto->pr_usrreqs->pr_send)(so,
1056: top, addr, control, l);
1.45 tv 1057: if (dontroute)
1058: so->so_options &= ~SO_DONTROUTE;
1059: if (resid > 0)
1060: so->so_state &= ~SS_MORETOCOME;
1061: clen = 0;
1.144 dyoung 1062: control = NULL;
1063: top = NULL;
1.45 tv 1064: mp = ⊤
1.144 dyoung 1065: if (error != 0)
1.1 cgd 1066: goto release;
1067: } while (resid && space > 0);
1068: } while (resid);
1069:
1.54 lukem 1070: release:
1.1 cgd 1071: sbunlock(&so->so_snd);
1.54 lukem 1072: out:
1.160 ad 1073: sounlock(so);
1074: splx(s);
1.1 cgd 1075: if (top)
1076: m_freem(top);
1077: if (control)
1078: m_freem(control);
1079: return (error);
1080: }
1081:
1082: /*
1.159 ad 1083: * Following replacement or removal of the first mbuf on the first
1084: * mbuf chain of a socket buffer, push necessary state changes back
1085: * into the socket buffer so that other consumers see the values
1086: * consistently. 'nextrecord' is the callers locally stored value of
1087: * the original value of sb->sb_mb->m_nextpkt which must be restored
1088: * when the lead mbuf changes. NOTE: 'nextrecord' may be NULL.
1089: */
1090: static void
1091: sbsync(struct sockbuf *sb, struct mbuf *nextrecord)
1092: {
1093:
1.160 ad 1094: KASSERT(solocked(sb->sb_so));
1095:
1.159 ad 1096: /*
1097: * First, update for the new value of nextrecord. If necessary,
1098: * make it the first record.
1099: */
1100: if (sb->sb_mb != NULL)
1101: sb->sb_mb->m_nextpkt = nextrecord;
1102: else
1103: sb->sb_mb = nextrecord;
1104:
1105: /*
1106: * Now update any dependent socket buffer fields to reflect
1107: * the new state. This is an inline of SB_EMPTY_FIXUP, with
1108: * the addition of a second clause that takes care of the
1109: * case where sb_mb has been updated, but remains the last
1110: * record.
1111: */
1112: if (sb->sb_mb == NULL) {
1113: sb->sb_mbtail = NULL;
1114: sb->sb_lastrecord = NULL;
1115: } else if (sb->sb_mb->m_nextpkt == NULL)
1116: sb->sb_lastrecord = sb->sb_mb;
1117: }
1118:
1119: /*
1.1 cgd 1120: * Implement receive operations on a socket.
1121: * We depend on the way that records are added to the sockbuf
1122: * by sbappend*. In particular, each record (mbufs linked through m_next)
1123: * must begin with an address if the protocol so specifies,
1124: * followed by an optional mbuf or mbufs containing ancillary data,
1125: * and then zero or more mbufs of data.
1126: * In order to avoid blocking network interrupts for the entire time here,
1127: * we splx() while doing the actual copy to user space.
1128: * Although the sockbuf is locked, new data may still be appended,
1129: * and thus we must maintain consistency of the sockbuf during that time.
1130: *
1131: * The caller may receive the data as a single mbuf chain by supplying
1132: * an mbuf **mp0 for use in returning the chain. The uio is then used
1133: * only for the count in uio_resid.
1134: */
1.3 andrew 1135: int
1.54 lukem 1136: soreceive(struct socket *so, struct mbuf **paddr, struct uio *uio,
1137: struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
1.1 cgd 1138: {
1.116 yamt 1139: struct lwp *l = curlwp;
1.160 ad 1140: struct mbuf *m, **mp, *mt;
1.211 chs 1141: size_t len, offset, moff, orig_resid;
1142: int atomic, flags, error, s, type;
1.99 matt 1143: const struct protosw *pr;
1.54 lukem 1144: struct mbuf *nextrecord;
1.67 he 1145: int mbuf_removed = 0;
1.146 dyoung 1146: const struct domain *dom;
1.196 dsl 1147: short wakeup_state = 0;
1.64 thorpej 1148:
1.54 lukem 1149: pr = so->so_proto;
1.146 dyoung 1150: atomic = pr->pr_flags & PR_ATOMIC;
1151: dom = pr->pr_domain;
1.1 cgd 1152: mp = mp0;
1.54 lukem 1153: type = 0;
1154: orig_resid = uio->uio_resid;
1.102 jonathan 1155:
1.144 dyoung 1156: if (paddr != NULL)
1157: *paddr = NULL;
1158: if (controlp != NULL)
1159: *controlp = NULL;
1160: if (flagsp != NULL)
1.1 cgd 1161: flags = *flagsp &~ MSG_EOR;
1162: else
1163: flags = 0;
1.66 enami 1164:
1.1 cgd 1165: if (flags & MSG_OOB) {
1166: m = m_get(M_WAIT, MT_DATA);
1.160 ad 1167: solock(so);
1.226 rtr 1168: error = (*pr->pr_usrreqs->pr_recvoob)(so, m, flags & MSG_PEEK);
1.160 ad 1169: sounlock(so);
1.1 cgd 1170: if (error)
1171: goto bad;
1172: do {
1.134 christos 1173: error = uiomove(mtod(m, void *),
1.211 chs 1174: MIN(uio->uio_resid, m->m_len), uio);
1.1 cgd 1175: m = m_free(m);
1.144 dyoung 1176: } while (uio->uio_resid > 0 && error == 0 && m);
1.54 lukem 1177: bad:
1.144 dyoung 1178: if (m != NULL)
1.1 cgd 1179: m_freem(m);
1.144 dyoung 1180: return error;
1.1 cgd 1181: }
1.144 dyoung 1182: if (mp != NULL)
1.140 dyoung 1183: *mp = NULL;
1.160 ad 1184:
1185: /*
1186: * solock() provides atomicity of access. splsoftnet() prevents
1187: * protocol processing soft interrupts from interrupting us and
1188: * blocking (expensive).
1189: */
1190: s = splsoftnet();
1191: solock(so);
1.54 lukem 1192: restart:
1.160 ad 1193: if ((error = sblock(&so->so_rcv, SBLOCKWAIT(flags))) != 0) {
1194: sounlock(so);
1195: splx(s);
1.144 dyoung 1196: return error;
1.160 ad 1197: }
1.1 cgd 1198:
1199: m = so->so_rcv.sb_mb;
1200: /*
1201: * If we have less data than requested, block awaiting more
1202: * (subject to any timeout) if:
1.15 mycroft 1203: * 1. the current count is less than the low water mark,
1.1 cgd 1204: * 2. MSG_WAITALL is set, and it is possible to do the entire
1.15 mycroft 1205: * receive operation at once if we block (resid <= hiwat), or
1206: * 3. MSG_DONTWAIT is not set.
1.1 cgd 1207: * If MSG_WAITALL is set but resid is larger than the receive buffer,
1208: * we have to do the receive in sections, and thus risk returning
1209: * a short count if a timeout or signal occurs after we start.
1210: */
1.144 dyoung 1211: if (m == NULL ||
1212: ((flags & MSG_DONTWAIT) == 0 &&
1213: so->so_rcv.sb_cc < uio->uio_resid &&
1214: (so->so_rcv.sb_cc < so->so_rcv.sb_lowat ||
1215: ((flags & MSG_WAITALL) &&
1216: uio->uio_resid <= so->so_rcv.sb_hiwat)) &&
1.146 dyoung 1217: m->m_nextpkt == NULL && !atomic)) {
1.1 cgd 1218: #ifdef DIAGNOSTIC
1.144 dyoung 1219: if (m == NULL && so->so_rcv.sb_cc)
1.1 cgd 1220: panic("receive 1");
1221: #endif
1222: if (so->so_error) {
1.144 dyoung 1223: if (m != NULL)
1.15 mycroft 1224: goto dontblock;
1.1 cgd 1225: error = so->so_error;
1226: if ((flags & MSG_PEEK) == 0)
1227: so->so_error = 0;
1228: goto release;
1229: }
1230: if (so->so_state & SS_CANTRCVMORE) {
1.144 dyoung 1231: if (m != NULL)
1.15 mycroft 1232: goto dontblock;
1.1 cgd 1233: else
1234: goto release;
1235: }
1.144 dyoung 1236: for (; m != NULL; m = m->m_next)
1.1 cgd 1237: if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) {
1238: m = so->so_rcv.sb_mb;
1239: goto dontblock;
1240: }
1241: if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
1242: (so->so_proto->pr_flags & PR_CONNREQUIRED)) {
1243: error = ENOTCONN;
1244: goto release;
1245: }
1246: if (uio->uio_resid == 0)
1247: goto release;
1.206 christos 1248: if ((so->so_state & SS_NBIO) ||
1249: (flags & (MSG_DONTWAIT|MSG_NBIO))) {
1.1 cgd 1250: error = EWOULDBLOCK;
1251: goto release;
1252: }
1.69 thorpej 1253: SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 1");
1254: SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 1");
1.1 cgd 1255: sbunlock(&so->so_rcv);
1.196 dsl 1256: if (wakeup_state & SS_RESTARTSYS)
1257: error = ERESTART;
1258: else
1259: error = sbwait(&so->so_rcv);
1.160 ad 1260: if (error != 0) {
1261: sounlock(so);
1262: splx(s);
1.144 dyoung 1263: return error;
1.160 ad 1264: }
1.196 dsl 1265: wakeup_state = so->so_state;
1.1 cgd 1266: goto restart;
1267: }
1.54 lukem 1268: dontblock:
1.69 thorpej 1269: /*
1270: * On entry here, m points to the first record of the socket buffer.
1.159 ad 1271: * From this point onward, we maintain 'nextrecord' as a cache of the
1272: * pointer to the next record in the socket buffer. We must keep the
1273: * various socket buffer pointers and local stack versions of the
1274: * pointers in sync, pushing out modifications before dropping the
1.160 ad 1275: * socket lock, and re-reading them when picking it up.
1.159 ad 1276: *
1277: * Otherwise, we will race with the network stack appending new data
1278: * or records onto the socket buffer by using inconsistent/stale
1279: * versions of the field, possibly resulting in socket buffer
1280: * corruption.
1281: *
1282: * By holding the high-level sblock(), we prevent simultaneous
1283: * readers from pulling off the front of the socket buffer.
1.69 thorpej 1284: */
1.144 dyoung 1285: if (l != NULL)
1.157 ad 1286: l->l_ru.ru_msgrcv++;
1.69 thorpej 1287: KASSERT(m == so->so_rcv.sb_mb);
1288: SBLASTRECORDCHK(&so->so_rcv, "soreceive 1");
1289: SBLASTMBUFCHK(&so->so_rcv, "soreceive 1");
1.1 cgd 1290: nextrecord = m->m_nextpkt;
1291: if (pr->pr_flags & PR_ADDR) {
1292: #ifdef DIAGNOSTIC
1293: if (m->m_type != MT_SONAME)
1294: panic("receive 1a");
1295: #endif
1.3 andrew 1296: orig_resid = 0;
1.1 cgd 1297: if (flags & MSG_PEEK) {
1298: if (paddr)
1299: *paddr = m_copy(m, 0, m->m_len);
1300: m = m->m_next;
1301: } else {
1302: sbfree(&so->so_rcv, m);
1.67 he 1303: mbuf_removed = 1;
1.144 dyoung 1304: if (paddr != NULL) {
1.1 cgd 1305: *paddr = m;
1306: so->so_rcv.sb_mb = m->m_next;
1.144 dyoung 1307: m->m_next = NULL;
1.1 cgd 1308: m = so->so_rcv.sb_mb;
1309: } else {
1310: MFREE(m, so->so_rcv.sb_mb);
1311: m = so->so_rcv.sb_mb;
1312: }
1.159 ad 1313: sbsync(&so->so_rcv, nextrecord);
1.1 cgd 1314: }
1315: }
1.159 ad 1316:
1317: /*
1318: * Process one or more MT_CONTROL mbufs present before any data mbufs
1319: * in the first mbuf chain on the socket buffer. If MSG_PEEK, we
1320: * just copy the data; if !MSG_PEEK, we call into the protocol to
1321: * perform externalization (or freeing if controlp == NULL).
1322: */
1323: if (__predict_false(m != NULL && m->m_type == MT_CONTROL)) {
1324: struct mbuf *cm = NULL, *cmn;
1325: struct mbuf **cme = &cm;
1326:
1327: do {
1328: if (flags & MSG_PEEK) {
1329: if (controlp != NULL) {
1330: *controlp = m_copy(m, 0, m->m_len);
1331: controlp = &(*controlp)->m_next;
1332: }
1333: m = m->m_next;
1334: } else {
1335: sbfree(&so->so_rcv, m);
1.1 cgd 1336: so->so_rcv.sb_mb = m->m_next;
1.144 dyoung 1337: m->m_next = NULL;
1.159 ad 1338: *cme = m;
1339: cme = &(*cme)->m_next;
1.1 cgd 1340: m = so->so_rcv.sb_mb;
1.159 ad 1341: }
1342: } while (m != NULL && m->m_type == MT_CONTROL);
1343: if ((flags & MSG_PEEK) == 0)
1344: sbsync(&so->so_rcv, nextrecord);
1345: for (; cm != NULL; cm = cmn) {
1346: cmn = cm->m_next;
1347: cm->m_next = NULL;
1348: type = mtod(cm, struct cmsghdr *)->cmsg_type;
1349: if (controlp != NULL) {
1350: if (dom->dom_externalize != NULL &&
1351: type == SCM_RIGHTS) {
1.160 ad 1352: sounlock(so);
1.159 ad 1353: splx(s);
1.204 christos 1354: error = (*dom->dom_externalize)(cm, l,
1355: (flags & MSG_CMSG_CLOEXEC) ?
1356: O_CLOEXEC : 0);
1.159 ad 1357: s = splsoftnet();
1.160 ad 1358: solock(so);
1.159 ad 1359: }
1360: *controlp = cm;
1361: while (*controlp != NULL)
1362: controlp = &(*controlp)->m_next;
1.1 cgd 1363: } else {
1.106 itojun 1364: /*
1365: * Dispose of any SCM_RIGHTS message that went
1366: * through the read path rather than recv.
1367: */
1.159 ad 1368: if (dom->dom_dispose != NULL &&
1369: type == SCM_RIGHTS) {
1.160 ad 1370: sounlock(so);
1.159 ad 1371: (*dom->dom_dispose)(cm);
1.160 ad 1372: solock(so);
1.159 ad 1373: }
1374: m_freem(cm);
1.1 cgd 1375: }
1376: }
1.159 ad 1377: if (m != NULL)
1378: nextrecord = so->so_rcv.sb_mb->m_nextpkt;
1379: else
1380: nextrecord = so->so_rcv.sb_mb;
1381: orig_resid = 0;
1.1 cgd 1382: }
1.69 thorpej 1383:
1.159 ad 1384: /* If m is non-NULL, we have some data to read. */
1385: if (__predict_true(m != NULL)) {
1.1 cgd 1386: type = m->m_type;
1387: if (type == MT_OOBDATA)
1388: flags |= MSG_OOB;
1389: }
1.69 thorpej 1390: SBLASTRECORDCHK(&so->so_rcv, "soreceive 2");
1391: SBLASTMBUFCHK(&so->so_rcv, "soreceive 2");
1392:
1.1 cgd 1393: moff = 0;
1394: offset = 0;
1.144 dyoung 1395: while (m != NULL && uio->uio_resid > 0 && error == 0) {
1.1 cgd 1396: if (m->m_type == MT_OOBDATA) {
1397: if (type != MT_OOBDATA)
1398: break;
1399: } else if (type == MT_OOBDATA)
1400: break;
1401: #ifdef DIAGNOSTIC
1402: else if (m->m_type != MT_DATA && m->m_type != MT_HEADER)
1403: panic("receive 3");
1404: #endif
1405: so->so_state &= ~SS_RCVATMARK;
1.196 dsl 1406: wakeup_state = 0;
1.1 cgd 1407: len = uio->uio_resid;
1408: if (so->so_oobmark && len > so->so_oobmark - offset)
1409: len = so->so_oobmark - offset;
1410: if (len > m->m_len - moff)
1411: len = m->m_len - moff;
1412: /*
1413: * If mp is set, just pass back the mbufs.
1414: * Otherwise copy them out via the uio, then free.
1415: * Sockbuf must be consistent here (points to current mbuf,
1416: * it points to next record) when we drop priority;
1417: * we must note any additions to the sockbuf when we
1418: * block interrupts again.
1419: */
1.144 dyoung 1420: if (mp == NULL) {
1.69 thorpej 1421: SBLASTRECORDCHK(&so->so_rcv, "soreceive uiomove");
1422: SBLASTMBUFCHK(&so->so_rcv, "soreceive uiomove");
1.160 ad 1423: sounlock(so);
1.1 cgd 1424: splx(s);
1.211 chs 1425: error = uiomove(mtod(m, char *) + moff, len, uio);
1.20 mycroft 1426: s = splsoftnet();
1.160 ad 1427: solock(so);
1.144 dyoung 1428: if (error != 0) {
1.67 he 1429: /*
1430: * If any part of the record has been removed
1431: * (such as the MT_SONAME mbuf, which will
1432: * happen when PR_ADDR, and thus also
1433: * PR_ATOMIC, is set), then drop the entire
1434: * record to maintain the atomicity of the
1435: * receive operation.
1436: *
1437: * This avoids a later panic("receive 1a")
1438: * when compiled with DIAGNOSTIC.
1439: */
1.146 dyoung 1440: if (m && mbuf_removed && atomic)
1.67 he 1441: (void) sbdroprecord(&so->so_rcv);
1442:
1.57 jdolecek 1443: goto release;
1.67 he 1444: }
1.1 cgd 1445: } else
1446: uio->uio_resid -= len;
1447: if (len == m->m_len - moff) {
1448: if (m->m_flags & M_EOR)
1449: flags |= MSG_EOR;
1450: if (flags & MSG_PEEK) {
1451: m = m->m_next;
1452: moff = 0;
1453: } else {
1454: nextrecord = m->m_nextpkt;
1455: sbfree(&so->so_rcv, m);
1456: if (mp) {
1457: *mp = m;
1458: mp = &m->m_next;
1459: so->so_rcv.sb_mb = m = m->m_next;
1.140 dyoung 1460: *mp = NULL;
1.1 cgd 1461: } else {
1462: MFREE(m, so->so_rcv.sb_mb);
1463: m = so->so_rcv.sb_mb;
1464: }
1.69 thorpej 1465: /*
1466: * If m != NULL, we also know that
1467: * so->so_rcv.sb_mb != NULL.
1468: */
1469: KASSERT(so->so_rcv.sb_mb == m);
1470: if (m) {
1.1 cgd 1471: m->m_nextpkt = nextrecord;
1.69 thorpej 1472: if (nextrecord == NULL)
1473: so->so_rcv.sb_lastrecord = m;
1474: } else {
1475: so->so_rcv.sb_mb = nextrecord;
1.70 thorpej 1476: SB_EMPTY_FIXUP(&so->so_rcv);
1.69 thorpej 1477: }
1478: SBLASTRECORDCHK(&so->so_rcv, "soreceive 3");
1479: SBLASTMBUFCHK(&so->so_rcv, "soreceive 3");
1.1 cgd 1480: }
1.144 dyoung 1481: } else if (flags & MSG_PEEK)
1482: moff += len;
1483: else {
1.160 ad 1484: if (mp != NULL) {
1485: mt = m_copym(m, 0, len, M_NOWAIT);
1486: if (__predict_false(mt == NULL)) {
1487: sounlock(so);
1488: mt = m_copym(m, 0, len, M_WAIT);
1489: solock(so);
1490: }
1491: *mp = mt;
1492: }
1.144 dyoung 1493: m->m_data += len;
1494: m->m_len -= len;
1495: so->so_rcv.sb_cc -= len;
1.1 cgd 1496: }
1497: if (so->so_oobmark) {
1498: if ((flags & MSG_PEEK) == 0) {
1499: so->so_oobmark -= len;
1500: if (so->so_oobmark == 0) {
1501: so->so_state |= SS_RCVATMARK;
1502: break;
1503: }
1.7 cgd 1504: } else {
1.1 cgd 1505: offset += len;
1.7 cgd 1506: if (offset == so->so_oobmark)
1507: break;
1508: }
1.1 cgd 1509: }
1510: if (flags & MSG_EOR)
1511: break;
1512: /*
1513: * If the MSG_WAITALL flag is set (for non-atomic socket),
1514: * we must not quit until "uio->uio_resid == 0" or an error
1515: * termination. If a signal/timeout occurs, return
1516: * with a short count but without error.
1517: * Keep sockbuf locked against other readers.
1518: */
1.144 dyoung 1519: while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 &&
1.3 andrew 1520: !sosendallatonce(so) && !nextrecord) {
1.1 cgd 1521: if (so->so_error || so->so_state & SS_CANTRCVMORE)
1522: break;
1.68 matt 1523: /*
1524: * If we are peeking and the socket receive buffer is
1525: * full, stop since we can't get more data to peek at.
1526: */
1527: if ((flags & MSG_PEEK) && sbspace(&so->so_rcv) <= 0)
1528: break;
1529: /*
1530: * If we've drained the socket buffer, tell the
1531: * protocol in case it needs to do something to
1532: * get it filled again.
1533: */
1534: if ((pr->pr_flags & PR_WANTRCVD) && so->so_pcb)
1.233 ! rtr 1535: (*pr->pr_usrreqs->pr_rcvd)(so, flags, l);
1.69 thorpej 1536: SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 2");
1537: SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 2");
1.196 dsl 1538: if (wakeup_state & SS_RESTARTSYS)
1539: error = ERESTART;
1540: else
1541: error = sbwait(&so->so_rcv);
1.144 dyoung 1542: if (error != 0) {
1.1 cgd 1543: sbunlock(&so->so_rcv);
1.160 ad 1544: sounlock(so);
1.1 cgd 1545: splx(s);
1.144 dyoung 1546: return 0;
1.1 cgd 1547: }
1.21 christos 1548: if ((m = so->so_rcv.sb_mb) != NULL)
1.1 cgd 1549: nextrecord = m->m_nextpkt;
1.196 dsl 1550: wakeup_state = so->so_state;
1.1 cgd 1551: }
1552: }
1.3 andrew 1553:
1.146 dyoung 1554: if (m && atomic) {
1.3 andrew 1555: flags |= MSG_TRUNC;
1556: if ((flags & MSG_PEEK) == 0)
1557: (void) sbdroprecord(&so->so_rcv);
1558: }
1.1 cgd 1559: if ((flags & MSG_PEEK) == 0) {
1.144 dyoung 1560: if (m == NULL) {
1.69 thorpej 1561: /*
1.70 thorpej 1562: * First part is an inline SB_EMPTY_FIXUP(). Second
1.69 thorpej 1563: * part makes sure sb_lastrecord is up-to-date if
1564: * there is still data in the socket buffer.
1565: */
1.1 cgd 1566: so->so_rcv.sb_mb = nextrecord;
1.69 thorpej 1567: if (so->so_rcv.sb_mb == NULL) {
1568: so->so_rcv.sb_mbtail = NULL;
1569: so->so_rcv.sb_lastrecord = NULL;
1570: } else if (nextrecord->m_nextpkt == NULL)
1571: so->so_rcv.sb_lastrecord = nextrecord;
1572: }
1573: SBLASTRECORDCHK(&so->so_rcv, "soreceive 4");
1574: SBLASTMBUFCHK(&so->so_rcv, "soreceive 4");
1.1 cgd 1575: if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
1.233 ! rtr 1576: (*pr->pr_usrreqs->pr_rcvd)(so, flags, l);
1.1 cgd 1577: }
1.3 andrew 1578: if (orig_resid == uio->uio_resid && orig_resid &&
1579: (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) {
1580: sbunlock(&so->so_rcv);
1581: goto restart;
1582: }
1.108 perry 1583:
1.144 dyoung 1584: if (flagsp != NULL)
1.1 cgd 1585: *flagsp |= flags;
1.54 lukem 1586: release:
1.1 cgd 1587: sbunlock(&so->so_rcv);
1.160 ad 1588: sounlock(so);
1.1 cgd 1589: splx(s);
1.144 dyoung 1590: return error;
1.1 cgd 1591: }
1592:
1.14 mycroft 1593: int
1.54 lukem 1594: soshutdown(struct socket *so, int how)
1.1 cgd 1595: {
1.99 matt 1596: const struct protosw *pr;
1.160 ad 1597: int error;
1598:
1599: KASSERT(solocked(so));
1.34 kleink 1600:
1.54 lukem 1601: pr = so->so_proto;
1.34 kleink 1602: if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR))
1603: return (EINVAL);
1.1 cgd 1604:
1.160 ad 1605: if (how == SHUT_RD || how == SHUT_RDWR) {
1.1 cgd 1606: sorflush(so);
1.160 ad 1607: error = 0;
1608: }
1.34 kleink 1609: if (how == SHUT_WR || how == SHUT_RDWR)
1.229 rtr 1610: error = (*pr->pr_usrreqs->pr_shutdown)(so);
1.160 ad 1611:
1612: return error;
1.1 cgd 1613: }
1614:
1.195 dsl 1615: void
1.196 dsl 1616: sorestart(struct socket *so)
1.188 ad 1617: {
1.196 dsl 1618: /*
1619: * An application has called close() on an fd on which another
1620: * of its threads has called a socket system call.
1621: * Mark this and wake everyone up, and code that would block again
1622: * instead returns ERESTART.
1623: * On system call re-entry the fd is validated and EBADF returned.
1624: * Any other fd will block again on the 2nd syscall.
1625: */
1.188 ad 1626: solock(so);
1.196 dsl 1627: so->so_state |= SS_RESTARTSYS;
1.188 ad 1628: cv_broadcast(&so->so_cv);
1.196 dsl 1629: cv_broadcast(&so->so_snd.sb_cv);
1630: cv_broadcast(&so->so_rcv.sb_cv);
1.188 ad 1631: sounlock(so);
1632: }
1633:
1.14 mycroft 1634: void
1.54 lukem 1635: sorflush(struct socket *so)
1.1 cgd 1636: {
1.54 lukem 1637: struct sockbuf *sb, asb;
1.99 matt 1638: const struct protosw *pr;
1.160 ad 1639:
1640: KASSERT(solocked(so));
1.1 cgd 1641:
1.54 lukem 1642: sb = &so->so_rcv;
1643: pr = so->so_proto;
1.160 ad 1644: socantrcvmore(so);
1.1 cgd 1645: sb->sb_flags |= SB_NOINTR;
1.160 ad 1646: (void )sblock(sb, M_WAITOK);
1.1 cgd 1647: sbunlock(sb);
1648: asb = *sb;
1.86 wrstuden 1649: /*
1650: * Clear most of the sockbuf structure, but leave some of the
1651: * fields valid.
1652: */
1653: memset(&sb->sb_startzero, 0,
1654: sizeof(*sb) - offsetof(struct sockbuf, sb_startzero));
1.160 ad 1655: if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose) {
1656: sounlock(so);
1.1 cgd 1657: (*pr->pr_domain->dom_dispose)(asb.sb_mb);
1.160 ad 1658: solock(so);
1659: }
1.98 christos 1660: sbrelease(&asb, so);
1.1 cgd 1661: }
1662:
1.171 plunky 1663: /*
1664: * internal set SOL_SOCKET options
1665: */
1.142 dyoung 1666: static int
1.171 plunky 1667: sosetopt1(struct socket *so, const struct sockopt *sopt)
1.1 cgd 1668: {
1.219 christos 1669: int error = EINVAL, opt;
1670: int optval = 0; /* XXX: gcc */
1.171 plunky 1671: struct linger l;
1672: struct timeval tv;
1.142 dyoung 1673:
1.179 christos 1674: switch ((opt = sopt->sopt_name)) {
1.142 dyoung 1675:
1.170 tls 1676: case SO_ACCEPTFILTER:
1.177 ad 1677: error = accept_filt_setopt(so, sopt);
1678: KASSERT(solocked(so));
1.170 tls 1679: break;
1680:
1.171 plunky 1681: case SO_LINGER:
1682: error = sockopt_get(sopt, &l, sizeof(l));
1.177 ad 1683: solock(so);
1.171 plunky 1684: if (error)
1.177 ad 1685: break;
1.171 plunky 1686: if (l.l_linger < 0 || l.l_linger > USHRT_MAX ||
1.177 ad 1687: l.l_linger > (INT_MAX / hz)) {
1688: error = EDOM;
1689: break;
1690: }
1.171 plunky 1691: so->so_linger = l.l_linger;
1692: if (l.l_onoff)
1693: so->so_options |= SO_LINGER;
1694: else
1695: so->so_options &= ~SO_LINGER;
1.177 ad 1696: break;
1.1 cgd 1697:
1.142 dyoung 1698: case SO_DEBUG:
1699: case SO_KEEPALIVE:
1700: case SO_DONTROUTE:
1701: case SO_USELOOPBACK:
1702: case SO_BROADCAST:
1703: case SO_REUSEADDR:
1704: case SO_REUSEPORT:
1705: case SO_OOBINLINE:
1706: case SO_TIMESTAMP:
1.207 christos 1707: case SO_NOSIGPIPE:
1.184 christos 1708: #ifdef SO_OTIMESTAMP
1709: case SO_OTIMESTAMP:
1710: #endif
1.171 plunky 1711: error = sockopt_getint(sopt, &optval);
1.177 ad 1712: solock(so);
1.171 plunky 1713: if (error)
1.177 ad 1714: break;
1.171 plunky 1715: if (optval)
1.179 christos 1716: so->so_options |= opt;
1.142 dyoung 1717: else
1.179 christos 1718: so->so_options &= ~opt;
1.142 dyoung 1719: break;
1720:
1721: case SO_SNDBUF:
1722: case SO_RCVBUF:
1723: case SO_SNDLOWAT:
1724: case SO_RCVLOWAT:
1.171 plunky 1725: error = sockopt_getint(sopt, &optval);
1.177 ad 1726: solock(so);
1.171 plunky 1727: if (error)
1.177 ad 1728: break;
1.1 cgd 1729:
1.142 dyoung 1730: /*
1731: * Values < 1 make no sense for any of these
1732: * options, so disallow them.
1733: */
1.177 ad 1734: if (optval < 1) {
1735: error = EINVAL;
1736: break;
1737: }
1.1 cgd 1738:
1.179 christos 1739: switch (opt) {
1.171 plunky 1740: case SO_SNDBUF:
1.177 ad 1741: if (sbreserve(&so->so_snd, (u_long)optval, so) == 0) {
1742: error = ENOBUFS;
1743: break;
1744: }
1.171 plunky 1745: so->so_snd.sb_flags &= ~SB_AUTOSIZE;
1746: break;
1.1 cgd 1747:
1748: case SO_RCVBUF:
1.177 ad 1749: if (sbreserve(&so->so_rcv, (u_long)optval, so) == 0) {
1750: error = ENOBUFS;
1751: break;
1752: }
1.171 plunky 1753: so->so_rcv.sb_flags &= ~SB_AUTOSIZE;
1.142 dyoung 1754: break;
1755:
1756: /*
1757: * Make sure the low-water is never greater than
1758: * the high-water.
1759: */
1.1 cgd 1760: case SO_SNDLOWAT:
1.171 plunky 1761: if (optval > so->so_snd.sb_hiwat)
1762: optval = so->so_snd.sb_hiwat;
1763:
1764: so->so_snd.sb_lowat = optval;
1.142 dyoung 1765: break;
1.171 plunky 1766:
1.1 cgd 1767: case SO_RCVLOWAT:
1.171 plunky 1768: if (optval > so->so_rcv.sb_hiwat)
1769: optval = so->so_rcv.sb_hiwat;
1770:
1771: so->so_rcv.sb_lowat = optval;
1.142 dyoung 1772: break;
1773: }
1774: break;
1.28 thorpej 1775:
1.179 christos 1776: #ifdef COMPAT_50
1777: case SO_OSNDTIMEO:
1778: case SO_ORCVTIMEO: {
1779: struct timeval50 otv;
1780: error = sockopt_get(sopt, &otv, sizeof(otv));
1.186 pooka 1781: if (error) {
1782: solock(so);
1.183 christos 1783: break;
1.186 pooka 1784: }
1.179 christos 1785: timeval50_to_timeval(&otv, &tv);
1786: opt = opt == SO_OSNDTIMEO ? SO_SNDTIMEO : SO_RCVTIMEO;
1.182 christos 1787: error = 0;
1.179 christos 1788: /*FALLTHROUGH*/
1789: }
1790: #endif /* COMPAT_50 */
1791:
1.142 dyoung 1792: case SO_SNDTIMEO:
1793: case SO_RCVTIMEO:
1.182 christos 1794: if (error)
1.179 christos 1795: error = sockopt_get(sopt, &tv, sizeof(tv));
1.177 ad 1796: solock(so);
1.171 plunky 1797: if (error)
1.177 ad 1798: break;
1.171 plunky 1799:
1.177 ad 1800: if (tv.tv_sec > (INT_MAX - tv.tv_usec / tick) / hz) {
1801: error = EDOM;
1802: break;
1803: }
1.28 thorpej 1804:
1.171 plunky 1805: optval = tv.tv_sec * hz + tv.tv_usec / tick;
1806: if (optval == 0 && tv.tv_usec != 0)
1807: optval = 1;
1.28 thorpej 1808:
1.179 christos 1809: switch (opt) {
1.142 dyoung 1810: case SO_SNDTIMEO:
1.171 plunky 1811: so->so_snd.sb_timeo = optval;
1.1 cgd 1812: break;
1813: case SO_RCVTIMEO:
1.171 plunky 1814: so->so_rcv.sb_timeo = optval;
1.142 dyoung 1815: break;
1816: }
1817: break;
1.1 cgd 1818:
1.142 dyoung 1819: default:
1.177 ad 1820: solock(so);
1821: error = ENOPROTOOPT;
1822: break;
1.142 dyoung 1823: }
1.177 ad 1824: KASSERT(solocked(so));
1825: return error;
1.142 dyoung 1826: }
1.1 cgd 1827:
1.142 dyoung 1828: int
1.171 plunky 1829: sosetopt(struct socket *so, struct sockopt *sopt)
1.142 dyoung 1830: {
1831: int error, prerr;
1.1 cgd 1832:
1.177 ad 1833: if (sopt->sopt_level == SOL_SOCKET) {
1.171 plunky 1834: error = sosetopt1(so, sopt);
1.177 ad 1835: KASSERT(solocked(so));
1836: } else {
1.142 dyoung 1837: error = ENOPROTOOPT;
1.177 ad 1838: solock(so);
1839: }
1.1 cgd 1840:
1.142 dyoung 1841: if ((error == 0 || error == ENOPROTOOPT) &&
1842: so->so_proto != NULL && so->so_proto->pr_ctloutput != NULL) {
1843: /* give the protocol stack a shot */
1.171 plunky 1844: prerr = (*so->so_proto->pr_ctloutput)(PRCO_SETOPT, so, sopt);
1.142 dyoung 1845: if (prerr == 0)
1846: error = 0;
1847: else if (prerr != ENOPROTOOPT)
1848: error = prerr;
1.171 plunky 1849: }
1.160 ad 1850: sounlock(so);
1.142 dyoung 1851: return error;
1.1 cgd 1852: }
1853:
1.171 plunky 1854: /*
1855: * so_setsockopt() is a wrapper providing a sockopt structure for sosetopt()
1856: */
1857: int
1858: so_setsockopt(struct lwp *l, struct socket *so, int level, int name,
1859: const void *val, size_t valsize)
1860: {
1861: struct sockopt sopt;
1862: int error;
1863:
1864: KASSERT(valsize == 0 || val != NULL);
1865:
1866: sockopt_init(&sopt, level, name, valsize);
1867: sockopt_set(&sopt, val, valsize);
1868:
1869: error = sosetopt(so, &sopt);
1870:
1871: sockopt_destroy(&sopt);
1872:
1873: return error;
1874: }
1875:
1876: /*
1877: * internal get SOL_SOCKET options
1878: */
1879: static int
1880: sogetopt1(struct socket *so, struct sockopt *sopt)
1881: {
1.179 christos 1882: int error, optval, opt;
1.171 plunky 1883: struct linger l;
1884: struct timeval tv;
1885:
1.179 christos 1886: switch ((opt = sopt->sopt_name)) {
1.171 plunky 1887:
1888: case SO_ACCEPTFILTER:
1.177 ad 1889: error = accept_filt_getopt(so, sopt);
1.171 plunky 1890: break;
1891:
1892: case SO_LINGER:
1893: l.l_onoff = (so->so_options & SO_LINGER) ? 1 : 0;
1894: l.l_linger = so->so_linger;
1895:
1896: error = sockopt_set(sopt, &l, sizeof(l));
1897: break;
1898:
1899: case SO_USELOOPBACK:
1900: case SO_DONTROUTE:
1901: case SO_DEBUG:
1902: case SO_KEEPALIVE:
1903: case SO_REUSEADDR:
1904: case SO_REUSEPORT:
1905: case SO_BROADCAST:
1906: case SO_OOBINLINE:
1907: case SO_TIMESTAMP:
1.207 christos 1908: case SO_NOSIGPIPE:
1.184 christos 1909: #ifdef SO_OTIMESTAMP
1910: case SO_OTIMESTAMP:
1911: #endif
1.218 seanb 1912: case SO_ACCEPTCONN:
1.179 christos 1913: error = sockopt_setint(sopt, (so->so_options & opt) ? 1 : 0);
1.171 plunky 1914: break;
1915:
1916: case SO_TYPE:
1917: error = sockopt_setint(sopt, so->so_type);
1918: break;
1919:
1920: case SO_ERROR:
1921: error = sockopt_setint(sopt, so->so_error);
1922: so->so_error = 0;
1923: break;
1924:
1925: case SO_SNDBUF:
1926: error = sockopt_setint(sopt, so->so_snd.sb_hiwat);
1927: break;
1928:
1929: case SO_RCVBUF:
1930: error = sockopt_setint(sopt, so->so_rcv.sb_hiwat);
1931: break;
1932:
1933: case SO_SNDLOWAT:
1934: error = sockopt_setint(sopt, so->so_snd.sb_lowat);
1935: break;
1936:
1937: case SO_RCVLOWAT:
1938: error = sockopt_setint(sopt, so->so_rcv.sb_lowat);
1939: break;
1940:
1.179 christos 1941: #ifdef COMPAT_50
1942: case SO_OSNDTIMEO:
1943: case SO_ORCVTIMEO: {
1944: struct timeval50 otv;
1945:
1946: optval = (opt == SO_OSNDTIMEO ?
1947: so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
1948:
1949: otv.tv_sec = optval / hz;
1950: otv.tv_usec = (optval % hz) * tick;
1951:
1952: error = sockopt_set(sopt, &otv, sizeof(otv));
1953: break;
1954: }
1955: #endif /* COMPAT_50 */
1956:
1.171 plunky 1957: case SO_SNDTIMEO:
1958: case SO_RCVTIMEO:
1.179 christos 1959: optval = (opt == SO_SNDTIMEO ?
1.171 plunky 1960: so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
1961:
1962: tv.tv_sec = optval / hz;
1963: tv.tv_usec = (optval % hz) * tick;
1964:
1965: error = sockopt_set(sopt, &tv, sizeof(tv));
1966: break;
1967:
1968: case SO_OVERFLOWED:
1969: error = sockopt_setint(sopt, so->so_rcv.sb_overflowed);
1970: break;
1971:
1972: default:
1973: error = ENOPROTOOPT;
1974: break;
1975: }
1976:
1977: return (error);
1978: }
1979:
1.14 mycroft 1980: int
1.171 plunky 1981: sogetopt(struct socket *so, struct sockopt *sopt)
1.1 cgd 1982: {
1.160 ad 1983: int error;
1.1 cgd 1984:
1.160 ad 1985: solock(so);
1.171 plunky 1986: if (sopt->sopt_level != SOL_SOCKET) {
1.1 cgd 1987: if (so->so_proto && so->so_proto->pr_ctloutput) {
1.160 ad 1988: error = ((*so->so_proto->pr_ctloutput)
1.171 plunky 1989: (PRCO_GETOPT, so, sopt));
1.1 cgd 1990: } else
1.160 ad 1991: error = (ENOPROTOOPT);
1.1 cgd 1992: } else {
1.171 plunky 1993: error = sogetopt1(so, sopt);
1994: }
1995: sounlock(so);
1996: return (error);
1997: }
1998:
1999: /*
2000: * alloc sockopt data buffer buffer
2001: * - will be released at destroy
2002: */
1.176 plunky 2003: static int
2004: sockopt_alloc(struct sockopt *sopt, size_t len, km_flag_t kmflag)
1.171 plunky 2005: {
2006:
2007: KASSERT(sopt->sopt_size == 0);
2008:
1.176 plunky 2009: if (len > sizeof(sopt->sopt_buf)) {
2010: sopt->sopt_data = kmem_zalloc(len, kmflag);
2011: if (sopt->sopt_data == NULL)
2012: return ENOMEM;
2013: } else
1.171 plunky 2014: sopt->sopt_data = sopt->sopt_buf;
2015:
2016: sopt->sopt_size = len;
1.176 plunky 2017: return 0;
1.171 plunky 2018: }
2019:
2020: /*
2021: * initialise sockopt storage
1.176 plunky 2022: * - MAY sleep during allocation
1.171 plunky 2023: */
2024: void
2025: sockopt_init(struct sockopt *sopt, int level, int name, size_t size)
2026: {
1.1 cgd 2027:
1.171 plunky 2028: memset(sopt, 0, sizeof(*sopt));
1.1 cgd 2029:
1.171 plunky 2030: sopt->sopt_level = level;
2031: sopt->sopt_name = name;
1.176 plunky 2032: (void)sockopt_alloc(sopt, size, KM_SLEEP);
1.171 plunky 2033: }
2034:
2035: /*
2036: * destroy sockopt storage
2037: * - will release any held memory references
2038: */
2039: void
2040: sockopt_destroy(struct sockopt *sopt)
2041: {
2042:
2043: if (sopt->sopt_data != sopt->sopt_buf)
1.173 plunky 2044: kmem_free(sopt->sopt_data, sopt->sopt_size);
1.171 plunky 2045:
2046: memset(sopt, 0, sizeof(*sopt));
2047: }
2048:
2049: /*
2050: * set sockopt value
2051: * - value is copied into sockopt
1.176 plunky 2052: * - memory is allocated when necessary, will not sleep
1.171 plunky 2053: */
2054: int
2055: sockopt_set(struct sockopt *sopt, const void *buf, size_t len)
2056: {
1.176 plunky 2057: int error;
1.171 plunky 2058:
1.176 plunky 2059: if (sopt->sopt_size == 0) {
2060: error = sockopt_alloc(sopt, len, KM_NOSLEEP);
2061: if (error)
2062: return error;
2063: }
1.171 plunky 2064:
2065: KASSERT(sopt->sopt_size == len);
2066: memcpy(sopt->sopt_data, buf, len);
2067: return 0;
2068: }
2069:
2070: /*
2071: * common case of set sockopt integer value
2072: */
2073: int
2074: sockopt_setint(struct sockopt *sopt, int val)
2075: {
2076:
2077: return sockopt_set(sopt, &val, sizeof(int));
2078: }
2079:
2080: /*
2081: * get sockopt value
2082: * - correct size must be given
2083: */
2084: int
2085: sockopt_get(const struct sockopt *sopt, void *buf, size_t len)
2086: {
1.170 tls 2087:
1.171 plunky 2088: if (sopt->sopt_size != len)
2089: return EINVAL;
1.1 cgd 2090:
1.171 plunky 2091: memcpy(buf, sopt->sopt_data, len);
2092: return 0;
2093: }
1.1 cgd 2094:
1.171 plunky 2095: /*
2096: * common case of get sockopt integer value
2097: */
2098: int
2099: sockopt_getint(const struct sockopt *sopt, int *valp)
2100: {
1.1 cgd 2101:
1.171 plunky 2102: return sockopt_get(sopt, valp, sizeof(int));
2103: }
1.1 cgd 2104:
1.171 plunky 2105: /*
2106: * set sockopt value from mbuf
2107: * - ONLY for legacy code
2108: * - mbuf is released by sockopt
1.176 plunky 2109: * - will not sleep
1.171 plunky 2110: */
2111: int
2112: sockopt_setmbuf(struct sockopt *sopt, struct mbuf *m)
2113: {
2114: size_t len;
1.176 plunky 2115: int error;
1.1 cgd 2116:
1.171 plunky 2117: len = m_length(m);
1.1 cgd 2118:
1.176 plunky 2119: if (sopt->sopt_size == 0) {
2120: error = sockopt_alloc(sopt, len, KM_NOSLEEP);
2121: if (error)
2122: return error;
2123: }
1.1 cgd 2124:
1.171 plunky 2125: KASSERT(sopt->sopt_size == len);
2126: m_copydata(m, 0, len, sopt->sopt_data);
2127: m_freem(m);
1.1 cgd 2128:
1.171 plunky 2129: return 0;
2130: }
1.1 cgd 2131:
1.171 plunky 2132: /*
2133: * get sockopt value into mbuf
2134: * - ONLY for legacy code
2135: * - mbuf to be released by the caller
1.176 plunky 2136: * - will not sleep
1.171 plunky 2137: */
2138: struct mbuf *
2139: sockopt_getmbuf(const struct sockopt *sopt)
2140: {
2141: struct mbuf *m;
1.107 darrenr 2142:
1.176 plunky 2143: if (sopt->sopt_size > MCLBYTES)
2144: return NULL;
2145:
2146: m = m_get(M_DONTWAIT, MT_SOOPTS);
1.171 plunky 2147: if (m == NULL)
2148: return NULL;
2149:
1.176 plunky 2150: if (sopt->sopt_size > MLEN) {
2151: MCLGET(m, M_DONTWAIT);
2152: if ((m->m_flags & M_EXT) == 0) {
2153: m_free(m);
2154: return NULL;
2155: }
1.1 cgd 2156: }
1.176 plunky 2157:
2158: memcpy(mtod(m, void *), sopt->sopt_data, sopt->sopt_size);
2159: m->m_len = sopt->sopt_size;
1.160 ad 2160:
1.171 plunky 2161: return m;
1.1 cgd 2162: }
2163:
1.14 mycroft 2164: void
1.54 lukem 2165: sohasoutofband(struct socket *so)
1.1 cgd 2166: {
1.153 rmind 2167:
1.90 christos 2168: fownsignal(so->so_pgid, SIGURG, POLL_PRI, POLLPRI|POLLRDBAND, so);
1.189 ad 2169: selnotify(&so->so_rcv.sb_sel, POLLPRI | POLLRDBAND, NOTE_SUBMIT);
1.1 cgd 2170: }
1.72 jdolecek 2171:
2172: static void
2173: filt_sordetach(struct knote *kn)
2174: {
2175: struct socket *so;
2176:
1.155 ad 2177: so = ((file_t *)kn->kn_obj)->f_data;
1.160 ad 2178: solock(so);
1.73 christos 2179: SLIST_REMOVE(&so->so_rcv.sb_sel.sel_klist, kn, knote, kn_selnext);
2180: if (SLIST_EMPTY(&so->so_rcv.sb_sel.sel_klist))
1.72 jdolecek 2181: so->so_rcv.sb_flags &= ~SB_KNOTE;
1.160 ad 2182: sounlock(so);
1.72 jdolecek 2183: }
2184:
2185: /*ARGSUSED*/
2186: static int
1.129 yamt 2187: filt_soread(struct knote *kn, long hint)
1.72 jdolecek 2188: {
2189: struct socket *so;
1.160 ad 2190: int rv;
1.72 jdolecek 2191:
1.155 ad 2192: so = ((file_t *)kn->kn_obj)->f_data;
1.160 ad 2193: if (hint != NOTE_SUBMIT)
2194: solock(so);
1.72 jdolecek 2195: kn->kn_data = so->so_rcv.sb_cc;
2196: if (so->so_state & SS_CANTRCVMORE) {
1.108 perry 2197: kn->kn_flags |= EV_EOF;
1.72 jdolecek 2198: kn->kn_fflags = so->so_error;
1.160 ad 2199: rv = 1;
2200: } else if (so->so_error) /* temporary udp error */
2201: rv = 1;
2202: else if (kn->kn_sfflags & NOTE_LOWAT)
2203: rv = (kn->kn_data >= kn->kn_sdata);
2204: else
2205: rv = (kn->kn_data >= so->so_rcv.sb_lowat);
2206: if (hint != NOTE_SUBMIT)
2207: sounlock(so);
2208: return rv;
1.72 jdolecek 2209: }
2210:
2211: static void
2212: filt_sowdetach(struct knote *kn)
2213: {
2214: struct socket *so;
2215:
1.155 ad 2216: so = ((file_t *)kn->kn_obj)->f_data;
1.160 ad 2217: solock(so);
1.73 christos 2218: SLIST_REMOVE(&so->so_snd.sb_sel.sel_klist, kn, knote, kn_selnext);
2219: if (SLIST_EMPTY(&so->so_snd.sb_sel.sel_klist))
1.72 jdolecek 2220: so->so_snd.sb_flags &= ~SB_KNOTE;
1.160 ad 2221: sounlock(so);
1.72 jdolecek 2222: }
2223:
2224: /*ARGSUSED*/
2225: static int
1.129 yamt 2226: filt_sowrite(struct knote *kn, long hint)
1.72 jdolecek 2227: {
2228: struct socket *so;
1.160 ad 2229: int rv;
1.72 jdolecek 2230:
1.155 ad 2231: so = ((file_t *)kn->kn_obj)->f_data;
1.160 ad 2232: if (hint != NOTE_SUBMIT)
2233: solock(so);
1.72 jdolecek 2234: kn->kn_data = sbspace(&so->so_snd);
2235: if (so->so_state & SS_CANTSENDMORE) {
1.108 perry 2236: kn->kn_flags |= EV_EOF;
1.72 jdolecek 2237: kn->kn_fflags = so->so_error;
1.160 ad 2238: rv = 1;
2239: } else if (so->so_error) /* temporary udp error */
2240: rv = 1;
2241: else if (((so->so_state & SS_ISCONNECTED) == 0) &&
1.72 jdolecek 2242: (so->so_proto->pr_flags & PR_CONNREQUIRED))
1.160 ad 2243: rv = 0;
2244: else if (kn->kn_sfflags & NOTE_LOWAT)
2245: rv = (kn->kn_data >= kn->kn_sdata);
2246: else
2247: rv = (kn->kn_data >= so->so_snd.sb_lowat);
2248: if (hint != NOTE_SUBMIT)
2249: sounlock(so);
2250: return rv;
1.72 jdolecek 2251: }
2252:
2253: /*ARGSUSED*/
2254: static int
1.129 yamt 2255: filt_solisten(struct knote *kn, long hint)
1.72 jdolecek 2256: {
2257: struct socket *so;
1.160 ad 2258: int rv;
1.72 jdolecek 2259:
1.155 ad 2260: so = ((file_t *)kn->kn_obj)->f_data;
1.72 jdolecek 2261:
2262: /*
2263: * Set kn_data to number of incoming connections, not
2264: * counting partial (incomplete) connections.
1.108 perry 2265: */
1.160 ad 2266: if (hint != NOTE_SUBMIT)
2267: solock(so);
1.72 jdolecek 2268: kn->kn_data = so->so_qlen;
1.160 ad 2269: rv = (kn->kn_data > 0);
2270: if (hint != NOTE_SUBMIT)
2271: sounlock(so);
2272: return rv;
1.72 jdolecek 2273: }
2274:
2275: static const struct filterops solisten_filtops =
2276: { 1, NULL, filt_sordetach, filt_solisten };
2277: static const struct filterops soread_filtops =
2278: { 1, NULL, filt_sordetach, filt_soread };
2279: static const struct filterops sowrite_filtops =
2280: { 1, NULL, filt_sowdetach, filt_sowrite };
2281:
2282: int
1.129 yamt 2283: soo_kqfilter(struct file *fp, struct knote *kn)
1.72 jdolecek 2284: {
2285: struct socket *so;
2286: struct sockbuf *sb;
2287:
1.155 ad 2288: so = ((file_t *)kn->kn_obj)->f_data;
1.160 ad 2289: solock(so);
1.72 jdolecek 2290: switch (kn->kn_filter) {
2291: case EVFILT_READ:
2292: if (so->so_options & SO_ACCEPTCONN)
2293: kn->kn_fop = &solisten_filtops;
2294: else
2295: kn->kn_fop = &soread_filtops;
2296: sb = &so->so_rcv;
2297: break;
2298: case EVFILT_WRITE:
2299: kn->kn_fop = &sowrite_filtops;
2300: sb = &so->so_snd;
2301: break;
2302: default:
1.160 ad 2303: sounlock(so);
1.149 pooka 2304: return (EINVAL);
1.72 jdolecek 2305: }
1.73 christos 2306: SLIST_INSERT_HEAD(&sb->sb_sel.sel_klist, kn, kn_selnext);
1.72 jdolecek 2307: sb->sb_flags |= SB_KNOTE;
1.160 ad 2308: sounlock(so);
1.72 jdolecek 2309: return (0);
2310: }
2311:
1.154 ad 2312: static int
2313: sodopoll(struct socket *so, int events)
2314: {
2315: int revents;
2316:
2317: revents = 0;
2318:
2319: if (events & (POLLIN | POLLRDNORM))
2320: if (soreadable(so))
2321: revents |= events & (POLLIN | POLLRDNORM);
2322:
2323: if (events & (POLLOUT | POLLWRNORM))
2324: if (sowritable(so))
2325: revents |= events & (POLLOUT | POLLWRNORM);
2326:
2327: if (events & (POLLPRI | POLLRDBAND))
2328: if (so->so_oobmark || (so->so_state & SS_RCVATMARK))
2329: revents |= events & (POLLPRI | POLLRDBAND);
2330:
2331: return revents;
2332: }
2333:
2334: int
2335: sopoll(struct socket *so, int events)
2336: {
2337: int revents = 0;
2338:
1.160 ad 2339: #ifndef DIAGNOSTIC
2340: /*
2341: * Do a quick, unlocked check in expectation that the socket
2342: * will be ready for I/O. Don't do this check if DIAGNOSTIC,
2343: * as the solocked() assertions will fail.
2344: */
1.154 ad 2345: if ((revents = sodopoll(so, events)) != 0)
2346: return revents;
1.160 ad 2347: #endif
1.154 ad 2348:
1.160 ad 2349: solock(so);
1.154 ad 2350: if ((revents = sodopoll(so, events)) == 0) {
2351: if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
2352: selrecord(curlwp, &so->so_rcv.sb_sel);
1.160 ad 2353: so->so_rcv.sb_flags |= SB_NOTIFY;
1.154 ad 2354: }
2355:
2356: if (events & (POLLOUT | POLLWRNORM)) {
2357: selrecord(curlwp, &so->so_snd.sb_sel);
1.160 ad 2358: so->so_snd.sb_flags |= SB_NOTIFY;
1.154 ad 2359: }
2360: }
1.160 ad 2361: sounlock(so);
1.154 ad 2362:
2363: return revents;
2364: }
2365:
2366:
1.94 yamt 2367: #include <sys/sysctl.h>
2368:
2369: static int sysctl_kern_somaxkva(SYSCTLFN_PROTO);
1.212 pooka 2370: static int sysctl_kern_sbmax(SYSCTLFN_PROTO);
1.94 yamt 2371:
2372: /*
2373: * sysctl helper routine for kern.somaxkva. ensures that the given
2374: * value is not too small.
2375: * (XXX should we maybe make sure it's not too large as well?)
2376: */
2377: static int
2378: sysctl_kern_somaxkva(SYSCTLFN_ARGS)
2379: {
2380: int error, new_somaxkva;
2381: struct sysctlnode node;
2382:
2383: new_somaxkva = somaxkva;
2384: node = *rnode;
2385: node.sysctl_data = &new_somaxkva;
2386: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2387: if (error || newp == NULL)
2388: return (error);
2389:
2390: if (new_somaxkva < (16 * 1024 * 1024)) /* sanity */
2391: return (EINVAL);
2392:
1.136 ad 2393: mutex_enter(&so_pendfree_lock);
1.94 yamt 2394: somaxkva = new_somaxkva;
1.136 ad 2395: cv_broadcast(&socurkva_cv);
2396: mutex_exit(&so_pendfree_lock);
1.94 yamt 2397:
2398: return (error);
2399: }
2400:
1.212 pooka 2401: /*
2402: * sysctl helper routine for kern.sbmax. Basically just ensures that
2403: * any new value is not too small.
2404: */
2405: static int
2406: sysctl_kern_sbmax(SYSCTLFN_ARGS)
2407: {
2408: int error, new_sbmax;
2409: struct sysctlnode node;
2410:
2411: new_sbmax = sb_max;
2412: node = *rnode;
2413: node.sysctl_data = &new_sbmax;
2414: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2415: if (error || newp == NULL)
2416: return (error);
2417:
2418: KERNEL_LOCK(1, NULL);
2419: error = sb_max_set(new_sbmax);
2420: KERNEL_UNLOCK_ONE(NULL);
2421:
2422: return (error);
2423: }
2424:
1.178 pooka 2425: static void
1.212 pooka 2426: sysctl_kern_socket_setup(void)
1.94 yamt 2427: {
2428:
1.178 pooka 2429: KASSERT(socket_sysctllog == NULL);
1.97 atatat 2430:
1.178 pooka 2431: sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
1.97 atatat 2432: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.103 atatat 2433: CTLTYPE_INT, "somaxkva",
2434: SYSCTL_DESCR("Maximum amount of kernel memory to be "
2435: "used for socket buffers"),
1.94 yamt 2436: sysctl_kern_somaxkva, 0, NULL, 0,
2437: CTL_KERN, KERN_SOMAXKVA, CTL_EOL);
1.212 pooka 2438:
2439: sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
2440: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2441: CTLTYPE_INT, "sbmax",
2442: SYSCTL_DESCR("Maximum socket buffer size"),
2443: sysctl_kern_sbmax, 0, NULL, 0,
2444: CTL_KERN, KERN_SBMAX, CTL_EOL);
1.94 yamt 2445: }
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