Annotation of src/sys/kern/uipc_socket.c, Revision 1.235.2.1
1.235.2.1! skrll 1: /* $NetBSD: uipc_socket.c,v 1.238 2015/04/05 23:19:56 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>
1.235.2.1! skrll 74: __KERNEL_RCSID(0, "$NetBSD: uipc_socket.c,v 1.238 2015/04/05 23:19:56 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: }
1.235 matt 603: fp->f_socket = so;
1.222 rmind 604: fd_affix(curproc, fp, fd);
605:
606: if (sop != NULL) {
607: *sop = so;
1.142 dyoung 608: }
1.222 rmind 609: *fdout = fd;
1.142 dyoung 610: return error;
611: }
612:
1.3 andrew 613: int
1.190 dyoung 614: sofamily(const struct socket *so)
615: {
616: const struct protosw *pr;
617: const struct domain *dom;
618:
619: if ((pr = so->so_proto) == NULL)
620: return AF_UNSPEC;
621: if ((dom = pr->pr_domain) == NULL)
622: return AF_UNSPEC;
623: return dom->dom_family;
624: }
625:
626: int
1.235.2.1! skrll 627: sobind(struct socket *so, struct sockaddr *nam, struct lwp *l)
1.1 cgd 628: {
1.160 ad 629: int error;
1.1 cgd 630:
1.160 ad 631: solock(so);
1.235.2.1! skrll 632: if (nam->sa_family != so->so_proto->pr_domain->dom_family) {
! 633: sounlock(so);
! 634: return EAFNOSUPPORT;
! 635: }
1.231 rtr 636: error = (*so->so_proto->pr_usrreqs->pr_bind)(so, nam, l);
1.160 ad 637: sounlock(so);
1.140 dyoung 638: return error;
1.1 cgd 639: }
640:
1.3 andrew 641: int
1.150 elad 642: solisten(struct socket *so, int backlog, struct lwp *l)
1.1 cgd 643: {
1.160 ad 644: int error;
1.1 cgd 645:
1.160 ad 646: solock(so);
1.158 ad 647: if ((so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING |
1.163 ad 648: SS_ISDISCONNECTING)) != 0) {
1.222 rmind 649: sounlock(so);
650: return EINVAL;
1.163 ad 651: }
1.231 rtr 652: error = (*so->so_proto->pr_usrreqs->pr_listen)(so, l);
1.140 dyoung 653: if (error != 0) {
1.160 ad 654: sounlock(so);
1.140 dyoung 655: return error;
1.1 cgd 656: }
1.63 matt 657: if (TAILQ_EMPTY(&so->so_q))
1.1 cgd 658: so->so_options |= SO_ACCEPTCONN;
659: if (backlog < 0)
660: backlog = 0;
1.49 jonathan 661: so->so_qlimit = min(backlog, somaxconn);
1.160 ad 662: sounlock(so);
1.140 dyoung 663: return 0;
1.1 cgd 664: }
665:
1.21 christos 666: void
1.54 lukem 667: sofree(struct socket *so)
1.1 cgd 668: {
1.161 ad 669: u_int refs;
1.1 cgd 670:
1.160 ad 671: KASSERT(solocked(so));
672:
673: if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0) {
674: sounlock(so);
1.1 cgd 675: return;
1.160 ad 676: }
1.43 mycroft 677: if (so->so_head) {
678: /*
679: * We must not decommission a socket that's on the accept(2)
680: * queue. If we do, then accept(2) may hang after select(2)
681: * indicated that the listening socket was ready.
682: */
1.160 ad 683: if (!soqremque(so, 0)) {
684: sounlock(so);
1.43 mycroft 685: return;
1.160 ad 686: }
1.43 mycroft 687: }
1.98 christos 688: if (so->so_rcv.sb_hiwat)
1.110 christos 689: (void)chgsbsize(so->so_uidinfo, &so->so_rcv.sb_hiwat, 0,
1.98 christos 690: RLIM_INFINITY);
691: if (so->so_snd.sb_hiwat)
1.110 christos 692: (void)chgsbsize(so->so_uidinfo, &so->so_snd.sb_hiwat, 0,
1.98 christos 693: RLIM_INFINITY);
694: sbrelease(&so->so_snd, so);
1.160 ad 695: KASSERT(!cv_has_waiters(&so->so_cv));
696: KASSERT(!cv_has_waiters(&so->so_rcv.sb_cv));
697: KASSERT(!cv_has_waiters(&so->so_snd.sb_cv));
1.1 cgd 698: sorflush(so);
1.161 ad 699: refs = so->so_aborting; /* XXX */
1.177 ad 700: /* Remove acccept filter if one is present. */
1.170 tls 701: if (so->so_accf != NULL)
1.177 ad 702: (void)accept_filt_clear(so);
1.160 ad 703: sounlock(so);
1.161 ad 704: if (refs == 0) /* XXX */
705: soput(so);
1.1 cgd 706: }
707:
708: /*
1.222 rmind 709: * soclose: close a socket on last file table reference removal.
710: * Initiate disconnect if connected. Free socket when disconnect complete.
1.1 cgd 711: */
1.3 andrew 712: int
1.54 lukem 713: soclose(struct socket *so)
1.1 cgd 714: {
1.222 rmind 715: struct socket *so2;
716: int error = 0;
1.1 cgd 717:
1.160 ad 718: solock(so);
1.1 cgd 719: if (so->so_options & SO_ACCEPTCONN) {
1.172 ad 720: for (;;) {
721: if ((so2 = TAILQ_FIRST(&so->so_q0)) != 0) {
1.160 ad 722: KASSERT(solocked2(so, so2));
723: (void) soqremque(so2, 0);
724: /* soabort drops the lock. */
725: (void) soabort(so2);
726: solock(so);
1.172 ad 727: continue;
1.160 ad 728: }
1.172 ad 729: if ((so2 = TAILQ_FIRST(&so->so_q)) != 0) {
1.160 ad 730: KASSERT(solocked2(so, so2));
731: (void) soqremque(so2, 1);
732: /* soabort drops the lock. */
733: (void) soabort(so2);
734: solock(so);
1.172 ad 735: continue;
1.160 ad 736: }
1.172 ad 737: break;
738: }
1.1 cgd 739: }
1.222 rmind 740: if (so->so_pcb == NULL)
1.1 cgd 741: goto discard;
742: if (so->so_state & SS_ISCONNECTED) {
743: if ((so->so_state & SS_ISDISCONNECTING) == 0) {
744: error = sodisconnect(so);
745: if (error)
746: goto drop;
747: }
748: if (so->so_options & SO_LINGER) {
1.206 christos 749: if ((so->so_state & (SS_ISDISCONNECTING|SS_NBIO)) ==
750: (SS_ISDISCONNECTING|SS_NBIO))
1.1 cgd 751: goto drop;
1.21 christos 752: while (so->so_state & SS_ISCONNECTED) {
1.185 yamt 753: error = sowait(so, true, so->so_linger * hz);
1.21 christos 754: if (error)
1.1 cgd 755: break;
1.21 christos 756: }
1.1 cgd 757: }
758: }
1.54 lukem 759: drop:
1.1 cgd 760: if (so->so_pcb) {
1.224 rmind 761: KASSERT(solocked(so));
762: (*so->so_proto->pr_usrreqs->pr_detach)(so);
1.1 cgd 763: }
1.54 lukem 764: discard:
1.222 rmind 765: KASSERT((so->so_state & SS_NOFDREF) == 0);
1.198 elad 766: kauth_cred_free(so->so_cred);
1.1 cgd 767: so->so_state |= SS_NOFDREF;
768: sofree(so);
1.222 rmind 769: return error;
1.1 cgd 770: }
771:
772: /*
1.160 ad 773: * Must be called with the socket locked.. Will return with it unlocked.
1.1 cgd 774: */
1.3 andrew 775: int
1.54 lukem 776: soabort(struct socket *so)
1.1 cgd 777: {
1.161 ad 778: u_int refs;
1.139 yamt 779: int error;
1.160 ad 780:
781: KASSERT(solocked(so));
782: KASSERT(so->so_head == NULL);
1.1 cgd 783:
1.161 ad 784: so->so_aborting++; /* XXX */
1.230 mrg 785: error = (*so->so_proto->pr_usrreqs->pr_abort)(so);
1.161 ad 786: refs = --so->so_aborting; /* XXX */
1.164 drochner 787: if (error || (refs == 0)) {
1.139 yamt 788: sofree(so);
1.160 ad 789: } else {
790: sounlock(so);
1.139 yamt 791: }
792: return error;
1.1 cgd 793: }
794:
1.3 andrew 795: int
1.54 lukem 796: soaccept(struct socket *so, struct mbuf *nam)
1.1 cgd 797: {
1.222 rmind 798: int error;
1.160 ad 799:
800: KASSERT(solocked(so));
1.222 rmind 801: KASSERT((so->so_state & SS_NOFDREF) != 0);
1.1 cgd 802:
803: so->so_state &= ~SS_NOFDREF;
1.55 thorpej 804: if ((so->so_state & SS_ISDISCONNECTED) == 0 ||
805: (so->so_proto->pr_flags & PR_ABRTACPTDIS) == 0)
1.225 rtr 806: error = (*so->so_proto->pr_usrreqs->pr_accept)(so, nam);
1.41 mycroft 807: else
1.53 itojun 808: error = ECONNABORTED;
1.52 itojun 809:
1.222 rmind 810: return error;
1.1 cgd 811: }
812:
1.3 andrew 813: int
1.114 christos 814: soconnect(struct socket *so, struct mbuf *nam, struct lwp *l)
1.1 cgd 815: {
1.222 rmind 816: int error;
1.160 ad 817:
818: KASSERT(solocked(so));
1.1 cgd 819:
820: if (so->so_options & SO_ACCEPTCONN)
1.222 rmind 821: return EOPNOTSUPP;
1.1 cgd 822: /*
823: * If protocol is connection-based, can only connect once.
824: * Otherwise, if connected, try to disconnect first.
825: * This allows user to disconnect by connecting to, e.g.,
826: * a null address.
827: */
828: if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
829: ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
830: (error = sodisconnect(so))))
831: error = EISCONN;
832: else
1.231 rtr 833: error = (*so->so_proto->pr_usrreqs->pr_connect)(so, nam, l);
1.222 rmind 834:
835: return error;
1.1 cgd 836: }
837:
1.3 andrew 838: int
1.54 lukem 839: soconnect2(struct socket *so1, struct socket *so2)
1.1 cgd 840: {
1.160 ad 841: KASSERT(solocked2(so1, so2));
1.1 cgd 842:
1.234 rtr 843: return (*so1->so_proto->pr_usrreqs->pr_connect2)(so1, so2);
1.1 cgd 844: }
845:
1.3 andrew 846: int
1.54 lukem 847: sodisconnect(struct socket *so)
1.1 cgd 848: {
1.160 ad 849: int error;
850:
851: KASSERT(solocked(so));
1.1 cgd 852:
853: if ((so->so_state & SS_ISCONNECTED) == 0) {
854: error = ENOTCONN;
1.160 ad 855: } else if (so->so_state & SS_ISDISCONNECTING) {
1.1 cgd 856: error = EALREADY;
1.160 ad 857: } else {
1.229 rtr 858: error = (*so->so_proto->pr_usrreqs->pr_disconnect)(so);
1.1 cgd 859: }
860: return (error);
861: }
862:
1.15 mycroft 863: #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK)
1.1 cgd 864: /*
865: * Send on a socket.
866: * If send must go all at once and message is larger than
867: * send buffering, then hard error.
868: * Lock against other senders.
869: * If must go all at once and not enough room now, then
870: * inform user that this would block and do nothing.
871: * Otherwise, if nonblocking, send as much as possible.
872: * The data to be sent is described by "uio" if nonzero,
873: * otherwise by the mbuf chain "top" (which must be null
874: * if uio is not). Data provided in mbuf chain must be small
875: * enough to send all at once.
876: *
877: * Returns nonzero on error, timeout or signal; callers
878: * must check for short counts if EINTR/ERESTART are returned.
879: * Data and control buffers are freed on return.
880: */
1.3 andrew 881: int
1.54 lukem 882: sosend(struct socket *so, struct mbuf *addr, struct uio *uio, struct mbuf *top,
1.114 christos 883: struct mbuf *control, int flags, struct lwp *l)
1.1 cgd 884: {
1.54 lukem 885: struct mbuf **mp, *m;
1.58 jdolecek 886: long space, len, resid, clen, mlen;
887: int error, s, dontroute, atomic;
1.196 dsl 888: short wakeup_state = 0;
1.54 lukem 889:
1.160 ad 890: clen = 0;
1.64 thorpej 891:
1.160 ad 892: /*
893: * solock() provides atomicity of access. splsoftnet() prevents
894: * protocol processing soft interrupts from interrupting us and
895: * blocking (expensive).
896: */
897: s = splsoftnet();
898: solock(so);
1.54 lukem 899: atomic = sosendallatonce(so) || top;
1.1 cgd 900: if (uio)
901: resid = uio->uio_resid;
902: else
903: resid = top->m_pkthdr.len;
1.7 cgd 904: /*
905: * In theory resid should be unsigned.
906: * However, space must be signed, as it might be less than 0
907: * if we over-committed, and we must use a signed comparison
908: * of space and resid. On the other hand, a negative resid
909: * causes us to loop sending 0-length segments to the protocol.
910: */
1.29 mycroft 911: if (resid < 0) {
912: error = EINVAL;
913: goto out;
914: }
1.1 cgd 915: dontroute =
916: (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
917: (so->so_proto->pr_flags & PR_ATOMIC);
1.165 christos 918: l->l_ru.ru_msgsnd++;
1.1 cgd 919: if (control)
920: clen = control->m_len;
1.54 lukem 921: restart:
1.21 christos 922: if ((error = sblock(&so->so_snd, SBLOCKWAIT(flags))) != 0)
1.1 cgd 923: goto out;
924: do {
1.160 ad 925: if (so->so_state & SS_CANTSENDMORE) {
926: error = EPIPE;
927: goto release;
928: }
1.48 thorpej 929: if (so->so_error) {
930: error = so->so_error;
931: so->so_error = 0;
932: goto release;
933: }
1.1 cgd 934: if ((so->so_state & SS_ISCONNECTED) == 0) {
935: if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
1.217 rmind 936: if (resid || clen == 0) {
1.160 ad 937: error = ENOTCONN;
938: goto release;
939: }
940: } else if (addr == 0) {
941: error = EDESTADDRREQ;
942: goto release;
943: }
1.1 cgd 944: }
945: space = sbspace(&so->so_snd);
946: if (flags & MSG_OOB)
947: space += 1024;
1.21 christos 948: if ((atomic && resid > so->so_snd.sb_hiwat) ||
1.160 ad 949: clen > so->so_snd.sb_hiwat) {
950: error = EMSGSIZE;
951: goto release;
952: }
1.96 mycroft 953: if (space < resid + clen &&
1.1 cgd 954: (atomic || space < so->so_snd.sb_lowat || space < clen)) {
1.206 christos 955: if ((so->so_state & SS_NBIO) || (flags & MSG_NBIO)) {
1.160 ad 956: error = EWOULDBLOCK;
957: goto release;
958: }
1.1 cgd 959: sbunlock(&so->so_snd);
1.196 dsl 960: if (wakeup_state & SS_RESTARTSYS) {
961: error = ERESTART;
962: goto out;
963: }
1.1 cgd 964: error = sbwait(&so->so_snd);
965: if (error)
966: goto out;
1.196 dsl 967: wakeup_state = so->so_state;
1.1 cgd 968: goto restart;
969: }
1.196 dsl 970: wakeup_state = 0;
1.1 cgd 971: mp = ⊤
972: space -= clen;
973: do {
1.45 tv 974: if (uio == NULL) {
975: /*
976: * Data is prepackaged in "top".
977: */
978: resid = 0;
979: if (flags & MSG_EOR)
980: top->m_flags |= M_EOR;
981: } else do {
1.160 ad 982: sounlock(so);
983: splx(s);
1.144 dyoung 984: if (top == NULL) {
1.78 matt 985: m = m_gethdr(M_WAIT, MT_DATA);
1.45 tv 986: mlen = MHLEN;
987: m->m_pkthdr.len = 0;
1.140 dyoung 988: m->m_pkthdr.rcvif = NULL;
1.45 tv 989: } else {
1.78 matt 990: m = m_get(M_WAIT, MT_DATA);
1.45 tv 991: mlen = MLEN;
992: }
1.78 matt 993: MCLAIM(m, so->so_snd.sb_mowner);
1.121 yamt 994: if (sock_loan_thresh >= 0 &&
995: uio->uio_iov->iov_len >= sock_loan_thresh &&
996: space >= sock_loan_thresh &&
1.64 thorpej 997: (len = sosend_loan(so, uio, m,
998: space)) != 0) {
999: SOSEND_COUNTER_INCR(&sosend_loan_big);
1000: space -= len;
1001: goto have_data;
1002: }
1.45 tv 1003: if (resid >= MINCLSIZE && space >= MCLBYTES) {
1.64 thorpej 1004: SOSEND_COUNTER_INCR(&sosend_copy_big);
1.201 oki 1005: m_clget(m, M_DONTWAIT);
1.45 tv 1006: if ((m->m_flags & M_EXT) == 0)
1007: goto nopages;
1008: mlen = MCLBYTES;
1009: if (atomic && top == 0) {
1.58 jdolecek 1010: len = lmin(MCLBYTES - max_hdr,
1.54 lukem 1011: resid);
1.45 tv 1012: m->m_data += max_hdr;
1013: } else
1.58 jdolecek 1014: len = lmin(MCLBYTES, resid);
1.45 tv 1015: space -= len;
1016: } else {
1.64 thorpej 1017: nopages:
1018: SOSEND_COUNTER_INCR(&sosend_copy_small);
1.58 jdolecek 1019: len = lmin(lmin(mlen, resid), space);
1.45 tv 1020: space -= len;
1021: /*
1022: * For datagram protocols, leave room
1023: * for protocol headers in first mbuf.
1024: */
1025: if (atomic && top == 0 && len < mlen)
1026: MH_ALIGN(m, len);
1027: }
1.144 dyoung 1028: error = uiomove(mtod(m, void *), (int)len, uio);
1.64 thorpej 1029: have_data:
1.45 tv 1030: resid = uio->uio_resid;
1031: m->m_len = len;
1032: *mp = m;
1033: top->m_pkthdr.len += len;
1.160 ad 1034: s = splsoftnet();
1035: solock(so);
1.144 dyoung 1036: if (error != 0)
1.45 tv 1037: goto release;
1038: mp = &m->m_next;
1039: if (resid <= 0) {
1040: if (flags & MSG_EOR)
1041: top->m_flags |= M_EOR;
1042: break;
1043: }
1044: } while (space > 0 && atomic);
1.108 perry 1045:
1.160 ad 1046: if (so->so_state & SS_CANTSENDMORE) {
1047: error = EPIPE;
1048: goto release;
1049: }
1.45 tv 1050: if (dontroute)
1051: so->so_options |= SO_DONTROUTE;
1052: if (resid > 0)
1053: so->so_state |= SS_MORETOCOME;
1.226 rtr 1054: if (flags & MSG_OOB)
1055: error = (*so->so_proto->pr_usrreqs->pr_sendoob)(so,
1056: top, control);
1057: else
1.232 rtr 1058: error = (*so->so_proto->pr_usrreqs->pr_send)(so,
1059: top, addr, control, l);
1.45 tv 1060: if (dontroute)
1061: so->so_options &= ~SO_DONTROUTE;
1062: if (resid > 0)
1063: so->so_state &= ~SS_MORETOCOME;
1064: clen = 0;
1.144 dyoung 1065: control = NULL;
1066: top = NULL;
1.45 tv 1067: mp = ⊤
1.144 dyoung 1068: if (error != 0)
1.1 cgd 1069: goto release;
1070: } while (resid && space > 0);
1071: } while (resid);
1072:
1.54 lukem 1073: release:
1.1 cgd 1074: sbunlock(&so->so_snd);
1.54 lukem 1075: out:
1.160 ad 1076: sounlock(so);
1077: splx(s);
1.1 cgd 1078: if (top)
1079: m_freem(top);
1080: if (control)
1081: m_freem(control);
1082: return (error);
1083: }
1084:
1085: /*
1.159 ad 1086: * Following replacement or removal of the first mbuf on the first
1087: * mbuf chain of a socket buffer, push necessary state changes back
1088: * into the socket buffer so that other consumers see the values
1089: * consistently. 'nextrecord' is the callers locally stored value of
1090: * the original value of sb->sb_mb->m_nextpkt which must be restored
1091: * when the lead mbuf changes. NOTE: 'nextrecord' may be NULL.
1092: */
1093: static void
1094: sbsync(struct sockbuf *sb, struct mbuf *nextrecord)
1095: {
1096:
1.160 ad 1097: KASSERT(solocked(sb->sb_so));
1098:
1.159 ad 1099: /*
1100: * First, update for the new value of nextrecord. If necessary,
1101: * make it the first record.
1102: */
1103: if (sb->sb_mb != NULL)
1104: sb->sb_mb->m_nextpkt = nextrecord;
1105: else
1106: sb->sb_mb = nextrecord;
1107:
1108: /*
1109: * Now update any dependent socket buffer fields to reflect
1110: * the new state. This is an inline of SB_EMPTY_FIXUP, with
1111: * the addition of a second clause that takes care of the
1112: * case where sb_mb has been updated, but remains the last
1113: * record.
1114: */
1115: if (sb->sb_mb == NULL) {
1116: sb->sb_mbtail = NULL;
1117: sb->sb_lastrecord = NULL;
1118: } else if (sb->sb_mb->m_nextpkt == NULL)
1119: sb->sb_lastrecord = sb->sb_mb;
1120: }
1121:
1122: /*
1.1 cgd 1123: * Implement receive operations on a socket.
1124: * We depend on the way that records are added to the sockbuf
1125: * by sbappend*. In particular, each record (mbufs linked through m_next)
1126: * must begin with an address if the protocol so specifies,
1127: * followed by an optional mbuf or mbufs containing ancillary data,
1128: * and then zero or more mbufs of data.
1129: * In order to avoid blocking network interrupts for the entire time here,
1130: * we splx() while doing the actual copy to user space.
1131: * Although the sockbuf is locked, new data may still be appended,
1132: * and thus we must maintain consistency of the sockbuf during that time.
1133: *
1134: * The caller may receive the data as a single mbuf chain by supplying
1135: * an mbuf **mp0 for use in returning the chain. The uio is then used
1136: * only for the count in uio_resid.
1137: */
1.3 andrew 1138: int
1.54 lukem 1139: soreceive(struct socket *so, struct mbuf **paddr, struct uio *uio,
1140: struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
1.1 cgd 1141: {
1.116 yamt 1142: struct lwp *l = curlwp;
1.160 ad 1143: struct mbuf *m, **mp, *mt;
1.211 chs 1144: size_t len, offset, moff, orig_resid;
1145: int atomic, flags, error, s, type;
1.99 matt 1146: const struct protosw *pr;
1.54 lukem 1147: struct mbuf *nextrecord;
1.67 he 1148: int mbuf_removed = 0;
1.146 dyoung 1149: const struct domain *dom;
1.196 dsl 1150: short wakeup_state = 0;
1.64 thorpej 1151:
1.54 lukem 1152: pr = so->so_proto;
1.146 dyoung 1153: atomic = pr->pr_flags & PR_ATOMIC;
1154: dom = pr->pr_domain;
1.1 cgd 1155: mp = mp0;
1.54 lukem 1156: type = 0;
1157: orig_resid = uio->uio_resid;
1.102 jonathan 1158:
1.144 dyoung 1159: if (paddr != NULL)
1160: *paddr = NULL;
1161: if (controlp != NULL)
1162: *controlp = NULL;
1163: if (flagsp != NULL)
1.1 cgd 1164: flags = *flagsp &~ MSG_EOR;
1165: else
1166: flags = 0;
1.66 enami 1167:
1.1 cgd 1168: if (flags & MSG_OOB) {
1169: m = m_get(M_WAIT, MT_DATA);
1.160 ad 1170: solock(so);
1.226 rtr 1171: error = (*pr->pr_usrreqs->pr_recvoob)(so, m, flags & MSG_PEEK);
1.160 ad 1172: sounlock(so);
1.1 cgd 1173: if (error)
1174: goto bad;
1175: do {
1.134 christos 1176: error = uiomove(mtod(m, void *),
1.211 chs 1177: MIN(uio->uio_resid, m->m_len), uio);
1.1 cgd 1178: m = m_free(m);
1.144 dyoung 1179: } while (uio->uio_resid > 0 && error == 0 && m);
1.54 lukem 1180: bad:
1.144 dyoung 1181: if (m != NULL)
1.1 cgd 1182: m_freem(m);
1.144 dyoung 1183: return error;
1.1 cgd 1184: }
1.144 dyoung 1185: if (mp != NULL)
1.140 dyoung 1186: *mp = NULL;
1.160 ad 1187:
1188: /*
1189: * solock() provides atomicity of access. splsoftnet() prevents
1190: * protocol processing soft interrupts from interrupting us and
1191: * blocking (expensive).
1192: */
1193: s = splsoftnet();
1194: solock(so);
1.54 lukem 1195: restart:
1.160 ad 1196: if ((error = sblock(&so->so_rcv, SBLOCKWAIT(flags))) != 0) {
1197: sounlock(so);
1198: splx(s);
1.144 dyoung 1199: return error;
1.160 ad 1200: }
1.1 cgd 1201:
1202: m = so->so_rcv.sb_mb;
1203: /*
1204: * If we have less data than requested, block awaiting more
1205: * (subject to any timeout) if:
1.15 mycroft 1206: * 1. the current count is less than the low water mark,
1.1 cgd 1207: * 2. MSG_WAITALL is set, and it is possible to do the entire
1.15 mycroft 1208: * receive operation at once if we block (resid <= hiwat), or
1209: * 3. MSG_DONTWAIT is not set.
1.1 cgd 1210: * If MSG_WAITALL is set but resid is larger than the receive buffer,
1211: * we have to do the receive in sections, and thus risk returning
1212: * a short count if a timeout or signal occurs after we start.
1213: */
1.144 dyoung 1214: if (m == NULL ||
1215: ((flags & MSG_DONTWAIT) == 0 &&
1216: so->so_rcv.sb_cc < uio->uio_resid &&
1217: (so->so_rcv.sb_cc < so->so_rcv.sb_lowat ||
1218: ((flags & MSG_WAITALL) &&
1219: uio->uio_resid <= so->so_rcv.sb_hiwat)) &&
1.146 dyoung 1220: m->m_nextpkt == NULL && !atomic)) {
1.1 cgd 1221: #ifdef DIAGNOSTIC
1.144 dyoung 1222: if (m == NULL && so->so_rcv.sb_cc)
1.1 cgd 1223: panic("receive 1");
1224: #endif
1225: if (so->so_error) {
1.144 dyoung 1226: if (m != NULL)
1.15 mycroft 1227: goto dontblock;
1.1 cgd 1228: error = so->so_error;
1229: if ((flags & MSG_PEEK) == 0)
1230: so->so_error = 0;
1231: goto release;
1232: }
1233: if (so->so_state & SS_CANTRCVMORE) {
1.144 dyoung 1234: if (m != NULL)
1.15 mycroft 1235: goto dontblock;
1.1 cgd 1236: else
1237: goto release;
1238: }
1.144 dyoung 1239: for (; m != NULL; m = m->m_next)
1.1 cgd 1240: if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) {
1241: m = so->so_rcv.sb_mb;
1242: goto dontblock;
1243: }
1244: if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
1245: (so->so_proto->pr_flags & PR_CONNREQUIRED)) {
1246: error = ENOTCONN;
1247: goto release;
1248: }
1249: if (uio->uio_resid == 0)
1250: goto release;
1.206 christos 1251: if ((so->so_state & SS_NBIO) ||
1252: (flags & (MSG_DONTWAIT|MSG_NBIO))) {
1.1 cgd 1253: error = EWOULDBLOCK;
1254: goto release;
1255: }
1.69 thorpej 1256: SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 1");
1257: SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 1");
1.1 cgd 1258: sbunlock(&so->so_rcv);
1.196 dsl 1259: if (wakeup_state & SS_RESTARTSYS)
1260: error = ERESTART;
1261: else
1262: error = sbwait(&so->so_rcv);
1.160 ad 1263: if (error != 0) {
1264: sounlock(so);
1265: splx(s);
1.144 dyoung 1266: return error;
1.160 ad 1267: }
1.196 dsl 1268: wakeup_state = so->so_state;
1.1 cgd 1269: goto restart;
1270: }
1.54 lukem 1271: dontblock:
1.69 thorpej 1272: /*
1273: * On entry here, m points to the first record of the socket buffer.
1.159 ad 1274: * From this point onward, we maintain 'nextrecord' as a cache of the
1275: * pointer to the next record in the socket buffer. We must keep the
1276: * various socket buffer pointers and local stack versions of the
1277: * pointers in sync, pushing out modifications before dropping the
1.160 ad 1278: * socket lock, and re-reading them when picking it up.
1.159 ad 1279: *
1280: * Otherwise, we will race with the network stack appending new data
1281: * or records onto the socket buffer by using inconsistent/stale
1282: * versions of the field, possibly resulting in socket buffer
1283: * corruption.
1284: *
1285: * By holding the high-level sblock(), we prevent simultaneous
1286: * readers from pulling off the front of the socket buffer.
1.69 thorpej 1287: */
1.144 dyoung 1288: if (l != NULL)
1.157 ad 1289: l->l_ru.ru_msgrcv++;
1.69 thorpej 1290: KASSERT(m == so->so_rcv.sb_mb);
1291: SBLASTRECORDCHK(&so->so_rcv, "soreceive 1");
1292: SBLASTMBUFCHK(&so->so_rcv, "soreceive 1");
1.1 cgd 1293: nextrecord = m->m_nextpkt;
1294: if (pr->pr_flags & PR_ADDR) {
1295: #ifdef DIAGNOSTIC
1296: if (m->m_type != MT_SONAME)
1297: panic("receive 1a");
1298: #endif
1.3 andrew 1299: orig_resid = 0;
1.1 cgd 1300: if (flags & MSG_PEEK) {
1301: if (paddr)
1302: *paddr = m_copy(m, 0, m->m_len);
1303: m = m->m_next;
1304: } else {
1305: sbfree(&so->so_rcv, m);
1.67 he 1306: mbuf_removed = 1;
1.144 dyoung 1307: if (paddr != NULL) {
1.1 cgd 1308: *paddr = m;
1309: so->so_rcv.sb_mb = m->m_next;
1.144 dyoung 1310: m->m_next = NULL;
1.1 cgd 1311: m = so->so_rcv.sb_mb;
1312: } else {
1313: MFREE(m, so->so_rcv.sb_mb);
1314: m = so->so_rcv.sb_mb;
1315: }
1.159 ad 1316: sbsync(&so->so_rcv, nextrecord);
1.1 cgd 1317: }
1318: }
1.159 ad 1319:
1320: /*
1321: * Process one or more MT_CONTROL mbufs present before any data mbufs
1322: * in the first mbuf chain on the socket buffer. If MSG_PEEK, we
1323: * just copy the data; if !MSG_PEEK, we call into the protocol to
1324: * perform externalization (or freeing if controlp == NULL).
1325: */
1326: if (__predict_false(m != NULL && m->m_type == MT_CONTROL)) {
1327: struct mbuf *cm = NULL, *cmn;
1328: struct mbuf **cme = &cm;
1329:
1330: do {
1331: if (flags & MSG_PEEK) {
1332: if (controlp != NULL) {
1333: *controlp = m_copy(m, 0, m->m_len);
1334: controlp = &(*controlp)->m_next;
1335: }
1336: m = m->m_next;
1337: } else {
1338: sbfree(&so->so_rcv, m);
1.1 cgd 1339: so->so_rcv.sb_mb = m->m_next;
1.144 dyoung 1340: m->m_next = NULL;
1.159 ad 1341: *cme = m;
1342: cme = &(*cme)->m_next;
1.1 cgd 1343: m = so->so_rcv.sb_mb;
1.159 ad 1344: }
1345: } while (m != NULL && m->m_type == MT_CONTROL);
1346: if ((flags & MSG_PEEK) == 0)
1347: sbsync(&so->so_rcv, nextrecord);
1348: for (; cm != NULL; cm = cmn) {
1349: cmn = cm->m_next;
1350: cm->m_next = NULL;
1351: type = mtod(cm, struct cmsghdr *)->cmsg_type;
1352: if (controlp != NULL) {
1353: if (dom->dom_externalize != NULL &&
1354: type == SCM_RIGHTS) {
1.160 ad 1355: sounlock(so);
1.159 ad 1356: splx(s);
1.204 christos 1357: error = (*dom->dom_externalize)(cm, l,
1358: (flags & MSG_CMSG_CLOEXEC) ?
1359: O_CLOEXEC : 0);
1.159 ad 1360: s = splsoftnet();
1.160 ad 1361: solock(so);
1.159 ad 1362: }
1363: *controlp = cm;
1364: while (*controlp != NULL)
1365: controlp = &(*controlp)->m_next;
1.1 cgd 1366: } else {
1.106 itojun 1367: /*
1368: * Dispose of any SCM_RIGHTS message that went
1369: * through the read path rather than recv.
1370: */
1.159 ad 1371: if (dom->dom_dispose != NULL &&
1372: type == SCM_RIGHTS) {
1.160 ad 1373: sounlock(so);
1.159 ad 1374: (*dom->dom_dispose)(cm);
1.160 ad 1375: solock(so);
1.159 ad 1376: }
1377: m_freem(cm);
1.1 cgd 1378: }
1379: }
1.159 ad 1380: if (m != NULL)
1381: nextrecord = so->so_rcv.sb_mb->m_nextpkt;
1382: else
1383: nextrecord = so->so_rcv.sb_mb;
1384: orig_resid = 0;
1.1 cgd 1385: }
1.69 thorpej 1386:
1.159 ad 1387: /* If m is non-NULL, we have some data to read. */
1388: if (__predict_true(m != NULL)) {
1.1 cgd 1389: type = m->m_type;
1390: if (type == MT_OOBDATA)
1391: flags |= MSG_OOB;
1392: }
1.69 thorpej 1393: SBLASTRECORDCHK(&so->so_rcv, "soreceive 2");
1394: SBLASTMBUFCHK(&so->so_rcv, "soreceive 2");
1395:
1.1 cgd 1396: moff = 0;
1397: offset = 0;
1.144 dyoung 1398: while (m != NULL && uio->uio_resid > 0 && error == 0) {
1.1 cgd 1399: if (m->m_type == MT_OOBDATA) {
1400: if (type != MT_OOBDATA)
1401: break;
1402: } else if (type == MT_OOBDATA)
1403: break;
1404: #ifdef DIAGNOSTIC
1405: else if (m->m_type != MT_DATA && m->m_type != MT_HEADER)
1406: panic("receive 3");
1407: #endif
1408: so->so_state &= ~SS_RCVATMARK;
1.196 dsl 1409: wakeup_state = 0;
1.1 cgd 1410: len = uio->uio_resid;
1411: if (so->so_oobmark && len > so->so_oobmark - offset)
1412: len = so->so_oobmark - offset;
1413: if (len > m->m_len - moff)
1414: len = m->m_len - moff;
1415: /*
1416: * If mp is set, just pass back the mbufs.
1417: * Otherwise copy them out via the uio, then free.
1418: * Sockbuf must be consistent here (points to current mbuf,
1419: * it points to next record) when we drop priority;
1420: * we must note any additions to the sockbuf when we
1421: * block interrupts again.
1422: */
1.144 dyoung 1423: if (mp == NULL) {
1.69 thorpej 1424: SBLASTRECORDCHK(&so->so_rcv, "soreceive uiomove");
1425: SBLASTMBUFCHK(&so->so_rcv, "soreceive uiomove");
1.160 ad 1426: sounlock(so);
1.1 cgd 1427: splx(s);
1.211 chs 1428: error = uiomove(mtod(m, char *) + moff, len, uio);
1.20 mycroft 1429: s = splsoftnet();
1.160 ad 1430: solock(so);
1.144 dyoung 1431: if (error != 0) {
1.67 he 1432: /*
1433: * If any part of the record has been removed
1434: * (such as the MT_SONAME mbuf, which will
1435: * happen when PR_ADDR, and thus also
1436: * PR_ATOMIC, is set), then drop the entire
1437: * record to maintain the atomicity of the
1438: * receive operation.
1439: *
1440: * This avoids a later panic("receive 1a")
1441: * when compiled with DIAGNOSTIC.
1442: */
1.146 dyoung 1443: if (m && mbuf_removed && atomic)
1.67 he 1444: (void) sbdroprecord(&so->so_rcv);
1445:
1.57 jdolecek 1446: goto release;
1.67 he 1447: }
1.1 cgd 1448: } else
1449: uio->uio_resid -= len;
1450: if (len == m->m_len - moff) {
1451: if (m->m_flags & M_EOR)
1452: flags |= MSG_EOR;
1453: if (flags & MSG_PEEK) {
1454: m = m->m_next;
1455: moff = 0;
1456: } else {
1457: nextrecord = m->m_nextpkt;
1458: sbfree(&so->so_rcv, m);
1459: if (mp) {
1460: *mp = m;
1461: mp = &m->m_next;
1462: so->so_rcv.sb_mb = m = m->m_next;
1.140 dyoung 1463: *mp = NULL;
1.1 cgd 1464: } else {
1465: MFREE(m, so->so_rcv.sb_mb);
1466: m = so->so_rcv.sb_mb;
1467: }
1.69 thorpej 1468: /*
1469: * If m != NULL, we also know that
1470: * so->so_rcv.sb_mb != NULL.
1471: */
1472: KASSERT(so->so_rcv.sb_mb == m);
1473: if (m) {
1.1 cgd 1474: m->m_nextpkt = nextrecord;
1.69 thorpej 1475: if (nextrecord == NULL)
1476: so->so_rcv.sb_lastrecord = m;
1477: } else {
1478: so->so_rcv.sb_mb = nextrecord;
1.70 thorpej 1479: SB_EMPTY_FIXUP(&so->so_rcv);
1.69 thorpej 1480: }
1481: SBLASTRECORDCHK(&so->so_rcv, "soreceive 3");
1482: SBLASTMBUFCHK(&so->so_rcv, "soreceive 3");
1.1 cgd 1483: }
1.144 dyoung 1484: } else if (flags & MSG_PEEK)
1485: moff += len;
1486: else {
1.160 ad 1487: if (mp != NULL) {
1488: mt = m_copym(m, 0, len, M_NOWAIT);
1489: if (__predict_false(mt == NULL)) {
1490: sounlock(so);
1491: mt = m_copym(m, 0, len, M_WAIT);
1492: solock(so);
1493: }
1494: *mp = mt;
1495: }
1.144 dyoung 1496: m->m_data += len;
1497: m->m_len -= len;
1498: so->so_rcv.sb_cc -= len;
1.1 cgd 1499: }
1500: if (so->so_oobmark) {
1501: if ((flags & MSG_PEEK) == 0) {
1502: so->so_oobmark -= len;
1503: if (so->so_oobmark == 0) {
1504: so->so_state |= SS_RCVATMARK;
1505: break;
1506: }
1.7 cgd 1507: } else {
1.1 cgd 1508: offset += len;
1.7 cgd 1509: if (offset == so->so_oobmark)
1510: break;
1511: }
1.1 cgd 1512: }
1513: if (flags & MSG_EOR)
1514: break;
1515: /*
1516: * If the MSG_WAITALL flag is set (for non-atomic socket),
1517: * we must not quit until "uio->uio_resid == 0" or an error
1518: * termination. If a signal/timeout occurs, return
1519: * with a short count but without error.
1520: * Keep sockbuf locked against other readers.
1521: */
1.144 dyoung 1522: while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 &&
1.3 andrew 1523: !sosendallatonce(so) && !nextrecord) {
1.1 cgd 1524: if (so->so_error || so->so_state & SS_CANTRCVMORE)
1525: break;
1.68 matt 1526: /*
1527: * If we are peeking and the socket receive buffer is
1528: * full, stop since we can't get more data to peek at.
1529: */
1530: if ((flags & MSG_PEEK) && sbspace(&so->so_rcv) <= 0)
1531: break;
1532: /*
1533: * If we've drained the socket buffer, tell the
1534: * protocol in case it needs to do something to
1535: * get it filled again.
1536: */
1537: if ((pr->pr_flags & PR_WANTRCVD) && so->so_pcb)
1.233 rtr 1538: (*pr->pr_usrreqs->pr_rcvd)(so, flags, l);
1.69 thorpej 1539: SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 2");
1540: SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 2");
1.196 dsl 1541: if (wakeup_state & SS_RESTARTSYS)
1542: error = ERESTART;
1543: else
1544: error = sbwait(&so->so_rcv);
1.144 dyoung 1545: if (error != 0) {
1.1 cgd 1546: sbunlock(&so->so_rcv);
1.160 ad 1547: sounlock(so);
1.1 cgd 1548: splx(s);
1.144 dyoung 1549: return 0;
1.1 cgd 1550: }
1.21 christos 1551: if ((m = so->so_rcv.sb_mb) != NULL)
1.1 cgd 1552: nextrecord = m->m_nextpkt;
1.196 dsl 1553: wakeup_state = so->so_state;
1.1 cgd 1554: }
1555: }
1.3 andrew 1556:
1.146 dyoung 1557: if (m && atomic) {
1.3 andrew 1558: flags |= MSG_TRUNC;
1559: if ((flags & MSG_PEEK) == 0)
1560: (void) sbdroprecord(&so->so_rcv);
1561: }
1.1 cgd 1562: if ((flags & MSG_PEEK) == 0) {
1.144 dyoung 1563: if (m == NULL) {
1.69 thorpej 1564: /*
1.70 thorpej 1565: * First part is an inline SB_EMPTY_FIXUP(). Second
1.69 thorpej 1566: * part makes sure sb_lastrecord is up-to-date if
1567: * there is still data in the socket buffer.
1568: */
1.1 cgd 1569: so->so_rcv.sb_mb = nextrecord;
1.69 thorpej 1570: if (so->so_rcv.sb_mb == NULL) {
1571: so->so_rcv.sb_mbtail = NULL;
1572: so->so_rcv.sb_lastrecord = NULL;
1573: } else if (nextrecord->m_nextpkt == NULL)
1574: so->so_rcv.sb_lastrecord = nextrecord;
1575: }
1576: SBLASTRECORDCHK(&so->so_rcv, "soreceive 4");
1577: SBLASTMBUFCHK(&so->so_rcv, "soreceive 4");
1.1 cgd 1578: if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
1.233 rtr 1579: (*pr->pr_usrreqs->pr_rcvd)(so, flags, l);
1.1 cgd 1580: }
1.3 andrew 1581: if (orig_resid == uio->uio_resid && orig_resid &&
1582: (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) {
1583: sbunlock(&so->so_rcv);
1584: goto restart;
1585: }
1.108 perry 1586:
1.144 dyoung 1587: if (flagsp != NULL)
1.1 cgd 1588: *flagsp |= flags;
1.54 lukem 1589: release:
1.1 cgd 1590: sbunlock(&so->so_rcv);
1.160 ad 1591: sounlock(so);
1.1 cgd 1592: splx(s);
1.144 dyoung 1593: return error;
1.1 cgd 1594: }
1595:
1.14 mycroft 1596: int
1.54 lukem 1597: soshutdown(struct socket *so, int how)
1.1 cgd 1598: {
1.99 matt 1599: const struct protosw *pr;
1.160 ad 1600: int error;
1601:
1602: KASSERT(solocked(so));
1.34 kleink 1603:
1.54 lukem 1604: pr = so->so_proto;
1.34 kleink 1605: if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR))
1606: return (EINVAL);
1.1 cgd 1607:
1.160 ad 1608: if (how == SHUT_RD || how == SHUT_RDWR) {
1.1 cgd 1609: sorflush(so);
1.160 ad 1610: error = 0;
1611: }
1.34 kleink 1612: if (how == SHUT_WR || how == SHUT_RDWR)
1.229 rtr 1613: error = (*pr->pr_usrreqs->pr_shutdown)(so);
1.160 ad 1614:
1615: return error;
1.1 cgd 1616: }
1617:
1.195 dsl 1618: void
1.196 dsl 1619: sorestart(struct socket *so)
1.188 ad 1620: {
1.196 dsl 1621: /*
1622: * An application has called close() on an fd on which another
1623: * of its threads has called a socket system call.
1624: * Mark this and wake everyone up, and code that would block again
1625: * instead returns ERESTART.
1626: * On system call re-entry the fd is validated and EBADF returned.
1627: * Any other fd will block again on the 2nd syscall.
1628: */
1.188 ad 1629: solock(so);
1.196 dsl 1630: so->so_state |= SS_RESTARTSYS;
1.188 ad 1631: cv_broadcast(&so->so_cv);
1.196 dsl 1632: cv_broadcast(&so->so_snd.sb_cv);
1633: cv_broadcast(&so->so_rcv.sb_cv);
1.188 ad 1634: sounlock(so);
1635: }
1636:
1.14 mycroft 1637: void
1.54 lukem 1638: sorflush(struct socket *so)
1.1 cgd 1639: {
1.54 lukem 1640: struct sockbuf *sb, asb;
1.99 matt 1641: const struct protosw *pr;
1.160 ad 1642:
1643: KASSERT(solocked(so));
1.1 cgd 1644:
1.54 lukem 1645: sb = &so->so_rcv;
1646: pr = so->so_proto;
1.160 ad 1647: socantrcvmore(so);
1.1 cgd 1648: sb->sb_flags |= SB_NOINTR;
1.160 ad 1649: (void )sblock(sb, M_WAITOK);
1.1 cgd 1650: sbunlock(sb);
1651: asb = *sb;
1.86 wrstuden 1652: /*
1653: * Clear most of the sockbuf structure, but leave some of the
1654: * fields valid.
1655: */
1656: memset(&sb->sb_startzero, 0,
1657: sizeof(*sb) - offsetof(struct sockbuf, sb_startzero));
1.160 ad 1658: if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose) {
1659: sounlock(so);
1.1 cgd 1660: (*pr->pr_domain->dom_dispose)(asb.sb_mb);
1.160 ad 1661: solock(so);
1662: }
1.98 christos 1663: sbrelease(&asb, so);
1.1 cgd 1664: }
1665:
1.171 plunky 1666: /*
1667: * internal set SOL_SOCKET options
1668: */
1.142 dyoung 1669: static int
1.171 plunky 1670: sosetopt1(struct socket *so, const struct sockopt *sopt)
1.1 cgd 1671: {
1.219 christos 1672: int error = EINVAL, opt;
1673: int optval = 0; /* XXX: gcc */
1.171 plunky 1674: struct linger l;
1675: struct timeval tv;
1.142 dyoung 1676:
1.179 christos 1677: switch ((opt = sopt->sopt_name)) {
1.142 dyoung 1678:
1.170 tls 1679: case SO_ACCEPTFILTER:
1.177 ad 1680: error = accept_filt_setopt(so, sopt);
1681: KASSERT(solocked(so));
1.170 tls 1682: break;
1683:
1.171 plunky 1684: case SO_LINGER:
1685: error = sockopt_get(sopt, &l, sizeof(l));
1.177 ad 1686: solock(so);
1.171 plunky 1687: if (error)
1.177 ad 1688: break;
1.171 plunky 1689: if (l.l_linger < 0 || l.l_linger > USHRT_MAX ||
1.177 ad 1690: l.l_linger > (INT_MAX / hz)) {
1691: error = EDOM;
1692: break;
1693: }
1.171 plunky 1694: so->so_linger = l.l_linger;
1695: if (l.l_onoff)
1696: so->so_options |= SO_LINGER;
1697: else
1698: so->so_options &= ~SO_LINGER;
1.177 ad 1699: break;
1.1 cgd 1700:
1.142 dyoung 1701: case SO_DEBUG:
1702: case SO_KEEPALIVE:
1703: case SO_DONTROUTE:
1704: case SO_USELOOPBACK:
1705: case SO_BROADCAST:
1706: case SO_REUSEADDR:
1707: case SO_REUSEPORT:
1708: case SO_OOBINLINE:
1709: case SO_TIMESTAMP:
1.207 christos 1710: case SO_NOSIGPIPE:
1.184 christos 1711: #ifdef SO_OTIMESTAMP
1712: case SO_OTIMESTAMP:
1713: #endif
1.171 plunky 1714: error = sockopt_getint(sopt, &optval);
1.177 ad 1715: solock(so);
1.171 plunky 1716: if (error)
1.177 ad 1717: break;
1.171 plunky 1718: if (optval)
1.179 christos 1719: so->so_options |= opt;
1.142 dyoung 1720: else
1.179 christos 1721: so->so_options &= ~opt;
1.142 dyoung 1722: break;
1723:
1724: case SO_SNDBUF:
1725: case SO_RCVBUF:
1726: case SO_SNDLOWAT:
1727: case SO_RCVLOWAT:
1.171 plunky 1728: error = sockopt_getint(sopt, &optval);
1.177 ad 1729: solock(so);
1.171 plunky 1730: if (error)
1.177 ad 1731: break;
1.1 cgd 1732:
1.142 dyoung 1733: /*
1734: * Values < 1 make no sense for any of these
1735: * options, so disallow them.
1736: */
1.177 ad 1737: if (optval < 1) {
1738: error = EINVAL;
1739: break;
1740: }
1.1 cgd 1741:
1.179 christos 1742: switch (opt) {
1.171 plunky 1743: case SO_SNDBUF:
1.177 ad 1744: if (sbreserve(&so->so_snd, (u_long)optval, so) == 0) {
1745: error = ENOBUFS;
1746: break;
1747: }
1.171 plunky 1748: so->so_snd.sb_flags &= ~SB_AUTOSIZE;
1749: break;
1.1 cgd 1750:
1751: case SO_RCVBUF:
1.177 ad 1752: if (sbreserve(&so->so_rcv, (u_long)optval, so) == 0) {
1753: error = ENOBUFS;
1754: break;
1755: }
1.171 plunky 1756: so->so_rcv.sb_flags &= ~SB_AUTOSIZE;
1.142 dyoung 1757: break;
1758:
1759: /*
1760: * Make sure the low-water is never greater than
1761: * the high-water.
1762: */
1.1 cgd 1763: case SO_SNDLOWAT:
1.171 plunky 1764: if (optval > so->so_snd.sb_hiwat)
1765: optval = so->so_snd.sb_hiwat;
1766:
1767: so->so_snd.sb_lowat = optval;
1.142 dyoung 1768: break;
1.171 plunky 1769:
1.1 cgd 1770: case SO_RCVLOWAT:
1.171 plunky 1771: if (optval > so->so_rcv.sb_hiwat)
1772: optval = so->so_rcv.sb_hiwat;
1773:
1774: so->so_rcv.sb_lowat = optval;
1.142 dyoung 1775: break;
1776: }
1777: break;
1.28 thorpej 1778:
1.179 christos 1779: #ifdef COMPAT_50
1780: case SO_OSNDTIMEO:
1781: case SO_ORCVTIMEO: {
1782: struct timeval50 otv;
1783: error = sockopt_get(sopt, &otv, sizeof(otv));
1.186 pooka 1784: if (error) {
1785: solock(so);
1.183 christos 1786: break;
1.186 pooka 1787: }
1.179 christos 1788: timeval50_to_timeval(&otv, &tv);
1789: opt = opt == SO_OSNDTIMEO ? SO_SNDTIMEO : SO_RCVTIMEO;
1.182 christos 1790: error = 0;
1.179 christos 1791: /*FALLTHROUGH*/
1792: }
1793: #endif /* COMPAT_50 */
1794:
1.142 dyoung 1795: case SO_SNDTIMEO:
1796: case SO_RCVTIMEO:
1.182 christos 1797: if (error)
1.179 christos 1798: error = sockopt_get(sopt, &tv, sizeof(tv));
1.177 ad 1799: solock(so);
1.171 plunky 1800: if (error)
1.177 ad 1801: break;
1.171 plunky 1802:
1.177 ad 1803: if (tv.tv_sec > (INT_MAX - tv.tv_usec / tick) / hz) {
1804: error = EDOM;
1805: break;
1806: }
1.28 thorpej 1807:
1.171 plunky 1808: optval = tv.tv_sec * hz + tv.tv_usec / tick;
1809: if (optval == 0 && tv.tv_usec != 0)
1810: optval = 1;
1.28 thorpej 1811:
1.179 christos 1812: switch (opt) {
1.142 dyoung 1813: case SO_SNDTIMEO:
1.171 plunky 1814: so->so_snd.sb_timeo = optval;
1.1 cgd 1815: break;
1816: case SO_RCVTIMEO:
1.171 plunky 1817: so->so_rcv.sb_timeo = optval;
1.142 dyoung 1818: break;
1819: }
1820: break;
1.1 cgd 1821:
1.142 dyoung 1822: default:
1.177 ad 1823: solock(so);
1824: error = ENOPROTOOPT;
1825: break;
1.142 dyoung 1826: }
1.177 ad 1827: KASSERT(solocked(so));
1828: return error;
1.142 dyoung 1829: }
1.1 cgd 1830:
1.142 dyoung 1831: int
1.171 plunky 1832: sosetopt(struct socket *so, struct sockopt *sopt)
1.142 dyoung 1833: {
1834: int error, prerr;
1.1 cgd 1835:
1.177 ad 1836: if (sopt->sopt_level == SOL_SOCKET) {
1.171 plunky 1837: error = sosetopt1(so, sopt);
1.177 ad 1838: KASSERT(solocked(so));
1839: } else {
1.142 dyoung 1840: error = ENOPROTOOPT;
1.177 ad 1841: solock(so);
1842: }
1.1 cgd 1843:
1.142 dyoung 1844: if ((error == 0 || error == ENOPROTOOPT) &&
1845: so->so_proto != NULL && so->so_proto->pr_ctloutput != NULL) {
1846: /* give the protocol stack a shot */
1.171 plunky 1847: prerr = (*so->so_proto->pr_ctloutput)(PRCO_SETOPT, so, sopt);
1.142 dyoung 1848: if (prerr == 0)
1849: error = 0;
1850: else if (prerr != ENOPROTOOPT)
1851: error = prerr;
1.171 plunky 1852: }
1.160 ad 1853: sounlock(so);
1.142 dyoung 1854: return error;
1.1 cgd 1855: }
1856:
1.171 plunky 1857: /*
1858: * so_setsockopt() is a wrapper providing a sockopt structure for sosetopt()
1859: */
1860: int
1861: so_setsockopt(struct lwp *l, struct socket *so, int level, int name,
1862: const void *val, size_t valsize)
1863: {
1864: struct sockopt sopt;
1865: int error;
1866:
1867: KASSERT(valsize == 0 || val != NULL);
1868:
1869: sockopt_init(&sopt, level, name, valsize);
1870: sockopt_set(&sopt, val, valsize);
1871:
1872: error = sosetopt(so, &sopt);
1873:
1874: sockopt_destroy(&sopt);
1875:
1876: return error;
1877: }
1878:
1879: /*
1880: * internal get SOL_SOCKET options
1881: */
1882: static int
1883: sogetopt1(struct socket *so, struct sockopt *sopt)
1884: {
1.179 christos 1885: int error, optval, opt;
1.171 plunky 1886: struct linger l;
1887: struct timeval tv;
1888:
1.179 christos 1889: switch ((opt = sopt->sopt_name)) {
1.171 plunky 1890:
1891: case SO_ACCEPTFILTER:
1.177 ad 1892: error = accept_filt_getopt(so, sopt);
1.171 plunky 1893: break;
1894:
1895: case SO_LINGER:
1896: l.l_onoff = (so->so_options & SO_LINGER) ? 1 : 0;
1897: l.l_linger = so->so_linger;
1898:
1899: error = sockopt_set(sopt, &l, sizeof(l));
1900: break;
1901:
1902: case SO_USELOOPBACK:
1903: case SO_DONTROUTE:
1904: case SO_DEBUG:
1905: case SO_KEEPALIVE:
1906: case SO_REUSEADDR:
1907: case SO_REUSEPORT:
1908: case SO_BROADCAST:
1909: case SO_OOBINLINE:
1910: case SO_TIMESTAMP:
1.207 christos 1911: case SO_NOSIGPIPE:
1.184 christos 1912: #ifdef SO_OTIMESTAMP
1913: case SO_OTIMESTAMP:
1914: #endif
1.218 seanb 1915: case SO_ACCEPTCONN:
1.179 christos 1916: error = sockopt_setint(sopt, (so->so_options & opt) ? 1 : 0);
1.171 plunky 1917: break;
1918:
1919: case SO_TYPE:
1920: error = sockopt_setint(sopt, so->so_type);
1921: break;
1922:
1923: case SO_ERROR:
1924: error = sockopt_setint(sopt, so->so_error);
1925: so->so_error = 0;
1926: break;
1927:
1928: case SO_SNDBUF:
1929: error = sockopt_setint(sopt, so->so_snd.sb_hiwat);
1930: break;
1931:
1932: case SO_RCVBUF:
1933: error = sockopt_setint(sopt, so->so_rcv.sb_hiwat);
1934: break;
1935:
1936: case SO_SNDLOWAT:
1937: error = sockopt_setint(sopt, so->so_snd.sb_lowat);
1938: break;
1939:
1940: case SO_RCVLOWAT:
1941: error = sockopt_setint(sopt, so->so_rcv.sb_lowat);
1942: break;
1943:
1.179 christos 1944: #ifdef COMPAT_50
1945: case SO_OSNDTIMEO:
1946: case SO_ORCVTIMEO: {
1947: struct timeval50 otv;
1948:
1949: optval = (opt == SO_OSNDTIMEO ?
1950: so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
1951:
1952: otv.tv_sec = optval / hz;
1953: otv.tv_usec = (optval % hz) * tick;
1954:
1955: error = sockopt_set(sopt, &otv, sizeof(otv));
1956: break;
1957: }
1958: #endif /* COMPAT_50 */
1959:
1.171 plunky 1960: case SO_SNDTIMEO:
1961: case SO_RCVTIMEO:
1.179 christos 1962: optval = (opt == SO_SNDTIMEO ?
1.171 plunky 1963: so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
1964:
1965: tv.tv_sec = optval / hz;
1966: tv.tv_usec = (optval % hz) * tick;
1967:
1968: error = sockopt_set(sopt, &tv, sizeof(tv));
1969: break;
1970:
1971: case SO_OVERFLOWED:
1972: error = sockopt_setint(sopt, so->so_rcv.sb_overflowed);
1973: break;
1974:
1975: default:
1976: error = ENOPROTOOPT;
1977: break;
1978: }
1979:
1980: return (error);
1981: }
1982:
1.14 mycroft 1983: int
1.171 plunky 1984: sogetopt(struct socket *so, struct sockopt *sopt)
1.1 cgd 1985: {
1.160 ad 1986: int error;
1.1 cgd 1987:
1.160 ad 1988: solock(so);
1.171 plunky 1989: if (sopt->sopt_level != SOL_SOCKET) {
1.1 cgd 1990: if (so->so_proto && so->so_proto->pr_ctloutput) {
1.160 ad 1991: error = ((*so->so_proto->pr_ctloutput)
1.171 plunky 1992: (PRCO_GETOPT, so, sopt));
1.1 cgd 1993: } else
1.160 ad 1994: error = (ENOPROTOOPT);
1.1 cgd 1995: } else {
1.171 plunky 1996: error = sogetopt1(so, sopt);
1997: }
1998: sounlock(so);
1999: return (error);
2000: }
2001:
2002: /*
2003: * alloc sockopt data buffer buffer
2004: * - will be released at destroy
2005: */
1.176 plunky 2006: static int
2007: sockopt_alloc(struct sockopt *sopt, size_t len, km_flag_t kmflag)
1.171 plunky 2008: {
2009:
2010: KASSERT(sopt->sopt_size == 0);
2011:
1.176 plunky 2012: if (len > sizeof(sopt->sopt_buf)) {
2013: sopt->sopt_data = kmem_zalloc(len, kmflag);
2014: if (sopt->sopt_data == NULL)
2015: return ENOMEM;
2016: } else
1.171 plunky 2017: sopt->sopt_data = sopt->sopt_buf;
2018:
2019: sopt->sopt_size = len;
1.176 plunky 2020: return 0;
1.171 plunky 2021: }
2022:
2023: /*
2024: * initialise sockopt storage
1.176 plunky 2025: * - MAY sleep during allocation
1.171 plunky 2026: */
2027: void
2028: sockopt_init(struct sockopt *sopt, int level, int name, size_t size)
2029: {
1.1 cgd 2030:
1.171 plunky 2031: memset(sopt, 0, sizeof(*sopt));
1.1 cgd 2032:
1.171 plunky 2033: sopt->sopt_level = level;
2034: sopt->sopt_name = name;
1.176 plunky 2035: (void)sockopt_alloc(sopt, size, KM_SLEEP);
1.171 plunky 2036: }
2037:
2038: /*
2039: * destroy sockopt storage
2040: * - will release any held memory references
2041: */
2042: void
2043: sockopt_destroy(struct sockopt *sopt)
2044: {
2045:
2046: if (sopt->sopt_data != sopt->sopt_buf)
1.173 plunky 2047: kmem_free(sopt->sopt_data, sopt->sopt_size);
1.171 plunky 2048:
2049: memset(sopt, 0, sizeof(*sopt));
2050: }
2051:
2052: /*
2053: * set sockopt value
2054: * - value is copied into sockopt
1.176 plunky 2055: * - memory is allocated when necessary, will not sleep
1.171 plunky 2056: */
2057: int
2058: sockopt_set(struct sockopt *sopt, const void *buf, size_t len)
2059: {
1.176 plunky 2060: int error;
1.171 plunky 2061:
1.176 plunky 2062: if (sopt->sopt_size == 0) {
2063: error = sockopt_alloc(sopt, len, KM_NOSLEEP);
2064: if (error)
2065: return error;
2066: }
1.171 plunky 2067:
2068: KASSERT(sopt->sopt_size == len);
2069: memcpy(sopt->sopt_data, buf, len);
2070: return 0;
2071: }
2072:
2073: /*
2074: * common case of set sockopt integer value
2075: */
2076: int
2077: sockopt_setint(struct sockopt *sopt, int val)
2078: {
2079:
2080: return sockopt_set(sopt, &val, sizeof(int));
2081: }
2082:
2083: /*
2084: * get sockopt value
2085: * - correct size must be given
2086: */
2087: int
2088: sockopt_get(const struct sockopt *sopt, void *buf, size_t len)
2089: {
1.170 tls 2090:
1.171 plunky 2091: if (sopt->sopt_size != len)
2092: return EINVAL;
1.1 cgd 2093:
1.171 plunky 2094: memcpy(buf, sopt->sopt_data, len);
2095: return 0;
2096: }
1.1 cgd 2097:
1.171 plunky 2098: /*
2099: * common case of get sockopt integer value
2100: */
2101: int
2102: sockopt_getint(const struct sockopt *sopt, int *valp)
2103: {
1.1 cgd 2104:
1.171 plunky 2105: return sockopt_get(sopt, valp, sizeof(int));
2106: }
1.1 cgd 2107:
1.171 plunky 2108: /*
2109: * set sockopt value from mbuf
2110: * - ONLY for legacy code
2111: * - mbuf is released by sockopt
1.176 plunky 2112: * - will not sleep
1.171 plunky 2113: */
2114: int
2115: sockopt_setmbuf(struct sockopt *sopt, struct mbuf *m)
2116: {
2117: size_t len;
1.176 plunky 2118: int error;
1.1 cgd 2119:
1.171 plunky 2120: len = m_length(m);
1.1 cgd 2121:
1.176 plunky 2122: if (sopt->sopt_size == 0) {
2123: error = sockopt_alloc(sopt, len, KM_NOSLEEP);
2124: if (error)
2125: return error;
2126: }
1.1 cgd 2127:
1.171 plunky 2128: KASSERT(sopt->sopt_size == len);
2129: m_copydata(m, 0, len, sopt->sopt_data);
2130: m_freem(m);
1.1 cgd 2131:
1.171 plunky 2132: return 0;
2133: }
1.1 cgd 2134:
1.171 plunky 2135: /*
2136: * get sockopt value into mbuf
2137: * - ONLY for legacy code
2138: * - mbuf to be released by the caller
1.176 plunky 2139: * - will not sleep
1.171 plunky 2140: */
2141: struct mbuf *
2142: sockopt_getmbuf(const struct sockopt *sopt)
2143: {
2144: struct mbuf *m;
1.107 darrenr 2145:
1.176 plunky 2146: if (sopt->sopt_size > MCLBYTES)
2147: return NULL;
2148:
2149: m = m_get(M_DONTWAIT, MT_SOOPTS);
1.171 plunky 2150: if (m == NULL)
2151: return NULL;
2152:
1.176 plunky 2153: if (sopt->sopt_size > MLEN) {
2154: MCLGET(m, M_DONTWAIT);
2155: if ((m->m_flags & M_EXT) == 0) {
2156: m_free(m);
2157: return NULL;
2158: }
1.1 cgd 2159: }
1.176 plunky 2160:
2161: memcpy(mtod(m, void *), sopt->sopt_data, sopt->sopt_size);
2162: m->m_len = sopt->sopt_size;
1.160 ad 2163:
1.171 plunky 2164: return m;
1.1 cgd 2165: }
2166:
1.14 mycroft 2167: void
1.54 lukem 2168: sohasoutofband(struct socket *so)
1.1 cgd 2169: {
1.153 rmind 2170:
1.90 christos 2171: fownsignal(so->so_pgid, SIGURG, POLL_PRI, POLLPRI|POLLRDBAND, so);
1.189 ad 2172: selnotify(&so->so_rcv.sb_sel, POLLPRI | POLLRDBAND, NOTE_SUBMIT);
1.1 cgd 2173: }
1.72 jdolecek 2174:
2175: static void
2176: filt_sordetach(struct knote *kn)
2177: {
2178: struct socket *so;
2179:
1.235 matt 2180: so = ((file_t *)kn->kn_obj)->f_socket;
1.160 ad 2181: solock(so);
1.73 christos 2182: SLIST_REMOVE(&so->so_rcv.sb_sel.sel_klist, kn, knote, kn_selnext);
2183: if (SLIST_EMPTY(&so->so_rcv.sb_sel.sel_klist))
1.72 jdolecek 2184: so->so_rcv.sb_flags &= ~SB_KNOTE;
1.160 ad 2185: sounlock(so);
1.72 jdolecek 2186: }
2187:
2188: /*ARGSUSED*/
2189: static int
1.129 yamt 2190: filt_soread(struct knote *kn, long hint)
1.72 jdolecek 2191: {
2192: struct socket *so;
1.160 ad 2193: int rv;
1.72 jdolecek 2194:
1.235 matt 2195: so = ((file_t *)kn->kn_obj)->f_socket;
1.160 ad 2196: if (hint != NOTE_SUBMIT)
2197: solock(so);
1.72 jdolecek 2198: kn->kn_data = so->so_rcv.sb_cc;
2199: if (so->so_state & SS_CANTRCVMORE) {
1.108 perry 2200: kn->kn_flags |= EV_EOF;
1.72 jdolecek 2201: kn->kn_fflags = so->so_error;
1.160 ad 2202: rv = 1;
2203: } else if (so->so_error) /* temporary udp error */
2204: rv = 1;
2205: else if (kn->kn_sfflags & NOTE_LOWAT)
2206: rv = (kn->kn_data >= kn->kn_sdata);
2207: else
2208: rv = (kn->kn_data >= so->so_rcv.sb_lowat);
2209: if (hint != NOTE_SUBMIT)
2210: sounlock(so);
2211: return rv;
1.72 jdolecek 2212: }
2213:
2214: static void
2215: filt_sowdetach(struct knote *kn)
2216: {
2217: struct socket *so;
2218:
1.235 matt 2219: so = ((file_t *)kn->kn_obj)->f_socket;
1.160 ad 2220: solock(so);
1.73 christos 2221: SLIST_REMOVE(&so->so_snd.sb_sel.sel_klist, kn, knote, kn_selnext);
2222: if (SLIST_EMPTY(&so->so_snd.sb_sel.sel_klist))
1.72 jdolecek 2223: so->so_snd.sb_flags &= ~SB_KNOTE;
1.160 ad 2224: sounlock(so);
1.72 jdolecek 2225: }
2226:
2227: /*ARGSUSED*/
2228: static int
1.129 yamt 2229: filt_sowrite(struct knote *kn, long hint)
1.72 jdolecek 2230: {
2231: struct socket *so;
1.160 ad 2232: int rv;
1.72 jdolecek 2233:
1.235 matt 2234: so = ((file_t *)kn->kn_obj)->f_socket;
1.160 ad 2235: if (hint != NOTE_SUBMIT)
2236: solock(so);
1.72 jdolecek 2237: kn->kn_data = sbspace(&so->so_snd);
2238: if (so->so_state & SS_CANTSENDMORE) {
1.108 perry 2239: kn->kn_flags |= EV_EOF;
1.72 jdolecek 2240: kn->kn_fflags = so->so_error;
1.160 ad 2241: rv = 1;
2242: } else if (so->so_error) /* temporary udp error */
2243: rv = 1;
2244: else if (((so->so_state & SS_ISCONNECTED) == 0) &&
1.72 jdolecek 2245: (so->so_proto->pr_flags & PR_CONNREQUIRED))
1.160 ad 2246: rv = 0;
2247: else if (kn->kn_sfflags & NOTE_LOWAT)
2248: rv = (kn->kn_data >= kn->kn_sdata);
2249: else
2250: rv = (kn->kn_data >= so->so_snd.sb_lowat);
2251: if (hint != NOTE_SUBMIT)
2252: sounlock(so);
2253: return rv;
1.72 jdolecek 2254: }
2255:
2256: /*ARGSUSED*/
2257: static int
1.129 yamt 2258: filt_solisten(struct knote *kn, long hint)
1.72 jdolecek 2259: {
2260: struct socket *so;
1.160 ad 2261: int rv;
1.72 jdolecek 2262:
1.235 matt 2263: so = ((file_t *)kn->kn_obj)->f_socket;
1.72 jdolecek 2264:
2265: /*
2266: * Set kn_data to number of incoming connections, not
2267: * counting partial (incomplete) connections.
1.108 perry 2268: */
1.160 ad 2269: if (hint != NOTE_SUBMIT)
2270: solock(so);
1.72 jdolecek 2271: kn->kn_data = so->so_qlen;
1.160 ad 2272: rv = (kn->kn_data > 0);
2273: if (hint != NOTE_SUBMIT)
2274: sounlock(so);
2275: return rv;
1.72 jdolecek 2276: }
2277:
2278: static const struct filterops solisten_filtops =
2279: { 1, NULL, filt_sordetach, filt_solisten };
2280: static const struct filterops soread_filtops =
2281: { 1, NULL, filt_sordetach, filt_soread };
2282: static const struct filterops sowrite_filtops =
2283: { 1, NULL, filt_sowdetach, filt_sowrite };
2284:
2285: int
1.129 yamt 2286: soo_kqfilter(struct file *fp, struct knote *kn)
1.72 jdolecek 2287: {
2288: struct socket *so;
2289: struct sockbuf *sb;
2290:
1.235 matt 2291: so = ((file_t *)kn->kn_obj)->f_socket;
1.160 ad 2292: solock(so);
1.72 jdolecek 2293: switch (kn->kn_filter) {
2294: case EVFILT_READ:
2295: if (so->so_options & SO_ACCEPTCONN)
2296: kn->kn_fop = &solisten_filtops;
2297: else
2298: kn->kn_fop = &soread_filtops;
2299: sb = &so->so_rcv;
2300: break;
2301: case EVFILT_WRITE:
2302: kn->kn_fop = &sowrite_filtops;
2303: sb = &so->so_snd;
2304: break;
2305: default:
1.160 ad 2306: sounlock(so);
1.149 pooka 2307: return (EINVAL);
1.72 jdolecek 2308: }
1.73 christos 2309: SLIST_INSERT_HEAD(&sb->sb_sel.sel_klist, kn, kn_selnext);
1.72 jdolecek 2310: sb->sb_flags |= SB_KNOTE;
1.160 ad 2311: sounlock(so);
1.72 jdolecek 2312: return (0);
2313: }
2314:
1.154 ad 2315: static int
2316: sodopoll(struct socket *so, int events)
2317: {
2318: int revents;
2319:
2320: revents = 0;
2321:
2322: if (events & (POLLIN | POLLRDNORM))
2323: if (soreadable(so))
2324: revents |= events & (POLLIN | POLLRDNORM);
2325:
2326: if (events & (POLLOUT | POLLWRNORM))
2327: if (sowritable(so))
2328: revents |= events & (POLLOUT | POLLWRNORM);
2329:
2330: if (events & (POLLPRI | POLLRDBAND))
2331: if (so->so_oobmark || (so->so_state & SS_RCVATMARK))
2332: revents |= events & (POLLPRI | POLLRDBAND);
2333:
2334: return revents;
2335: }
2336:
2337: int
2338: sopoll(struct socket *so, int events)
2339: {
2340: int revents = 0;
2341:
1.160 ad 2342: #ifndef DIAGNOSTIC
2343: /*
2344: * Do a quick, unlocked check in expectation that the socket
2345: * will be ready for I/O. Don't do this check if DIAGNOSTIC,
2346: * as the solocked() assertions will fail.
2347: */
1.154 ad 2348: if ((revents = sodopoll(so, events)) != 0)
2349: return revents;
1.160 ad 2350: #endif
1.154 ad 2351:
1.160 ad 2352: solock(so);
1.154 ad 2353: if ((revents = sodopoll(so, events)) == 0) {
2354: if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
2355: selrecord(curlwp, &so->so_rcv.sb_sel);
1.160 ad 2356: so->so_rcv.sb_flags |= SB_NOTIFY;
1.154 ad 2357: }
2358:
2359: if (events & (POLLOUT | POLLWRNORM)) {
2360: selrecord(curlwp, &so->so_snd.sb_sel);
1.160 ad 2361: so->so_snd.sb_flags |= SB_NOTIFY;
1.154 ad 2362: }
2363: }
1.160 ad 2364: sounlock(so);
1.154 ad 2365:
2366: return revents;
2367: }
2368:
2369:
1.94 yamt 2370: #include <sys/sysctl.h>
2371:
2372: static int sysctl_kern_somaxkva(SYSCTLFN_PROTO);
1.212 pooka 2373: static int sysctl_kern_sbmax(SYSCTLFN_PROTO);
1.94 yamt 2374:
2375: /*
2376: * sysctl helper routine for kern.somaxkva. ensures that the given
2377: * value is not too small.
2378: * (XXX should we maybe make sure it's not too large as well?)
2379: */
2380: static int
2381: sysctl_kern_somaxkva(SYSCTLFN_ARGS)
2382: {
2383: int error, new_somaxkva;
2384: struct sysctlnode node;
2385:
2386: new_somaxkva = somaxkva;
2387: node = *rnode;
2388: node.sysctl_data = &new_somaxkva;
2389: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2390: if (error || newp == NULL)
2391: return (error);
2392:
2393: if (new_somaxkva < (16 * 1024 * 1024)) /* sanity */
2394: return (EINVAL);
2395:
1.136 ad 2396: mutex_enter(&so_pendfree_lock);
1.94 yamt 2397: somaxkva = new_somaxkva;
1.136 ad 2398: cv_broadcast(&socurkva_cv);
2399: mutex_exit(&so_pendfree_lock);
1.94 yamt 2400:
2401: return (error);
2402: }
2403:
1.212 pooka 2404: /*
2405: * sysctl helper routine for kern.sbmax. Basically just ensures that
2406: * any new value is not too small.
2407: */
2408: static int
2409: sysctl_kern_sbmax(SYSCTLFN_ARGS)
2410: {
2411: int error, new_sbmax;
2412: struct sysctlnode node;
2413:
2414: new_sbmax = sb_max;
2415: node = *rnode;
2416: node.sysctl_data = &new_sbmax;
2417: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2418: if (error || newp == NULL)
2419: return (error);
2420:
2421: KERNEL_LOCK(1, NULL);
2422: error = sb_max_set(new_sbmax);
2423: KERNEL_UNLOCK_ONE(NULL);
2424:
2425: return (error);
2426: }
2427:
1.178 pooka 2428: static void
1.212 pooka 2429: sysctl_kern_socket_setup(void)
1.94 yamt 2430: {
2431:
1.178 pooka 2432: KASSERT(socket_sysctllog == NULL);
1.97 atatat 2433:
1.178 pooka 2434: sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
1.97 atatat 2435: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.103 atatat 2436: CTLTYPE_INT, "somaxkva",
2437: SYSCTL_DESCR("Maximum amount of kernel memory to be "
2438: "used for socket buffers"),
1.94 yamt 2439: sysctl_kern_somaxkva, 0, NULL, 0,
2440: CTL_KERN, KERN_SOMAXKVA, CTL_EOL);
1.212 pooka 2441:
2442: sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
2443: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2444: CTLTYPE_INT, "sbmax",
2445: SYSCTL_DESCR("Maximum socket buffer size"),
2446: sysctl_kern_sbmax, 0, NULL, 0,
2447: CTL_KERN, KERN_SBMAX, CTL_EOL);
1.94 yamt 2448: }
CVSweb <webmaster@jp.NetBSD.org>