Annotation of src/sys/kern/uipc_socket.c, Revision 1.249
1.249 ! christos 1: /* $NetBSD: uipc_socket.c,v 1.248 2016/06/10 13:27:15 ozaki-r 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>
1.249 ! christos 74: __KERNEL_RCSID(0, "$NetBSD: uipc_socket.c,v 1.248 2016/06/10 13:27:15 ozaki-r Exp $");
1.64 thorpej 75:
1.246 pooka 76: #ifdef _KERNEL_OPT
1.179 christos 77: #include "opt_compat_netbsd.h"
1.64 thorpej 78: #include "opt_sock_counters.h"
79: #include "opt_sosend_loan.h"
1.81 martin 80: #include "opt_mbuftrace.h"
1.84 ragge 81: #include "opt_somaxkva.h"
1.167 ad 82: #include "opt_multiprocessor.h" /* XXX */
1.247 rjs 83: #include "opt_sctp.h"
1.246 pooka 84: #endif
1.1 cgd 85:
1.9 mycroft 86: #include <sys/param.h>
87: #include <sys/systm.h>
88: #include <sys/proc.h>
89: #include <sys/file.h>
1.142 dyoung 90: #include <sys/filedesc.h>
1.173 plunky 91: #include <sys/kmem.h>
1.9 mycroft 92: #include <sys/mbuf.h>
93: #include <sys/domain.h>
94: #include <sys/kernel.h>
95: #include <sys/protosw.h>
96: #include <sys/socket.h>
97: #include <sys/socketvar.h>
1.21 christos 98: #include <sys/signalvar.h>
1.9 mycroft 99: #include <sys/resourcevar.h>
1.174 pooka 100: #include <sys/uidinfo.h>
1.72 jdolecek 101: #include <sys/event.h>
1.89 christos 102: #include <sys/poll.h>
1.118 elad 103: #include <sys/kauth.h>
1.136 ad 104: #include <sys/mutex.h>
105: #include <sys/condvar.h>
1.205 bouyer 106: #include <sys/kthread.h>
1.37 thorpej 107:
1.179 christos 108: #ifdef COMPAT_50
109: #include <compat/sys/time.h>
1.184 christos 110: #include <compat/sys/socket.h>
1.179 christos 111: #endif
112:
1.202 uebayasi 113: #include <uvm/uvm_extern.h>
114: #include <uvm/uvm_loan.h>
115: #include <uvm/uvm_page.h>
1.64 thorpej 116:
1.77 thorpej 117: MALLOC_DEFINE(M_SONAME, "soname", "socket name");
1.37 thorpej 118:
1.142 dyoung 119: extern const struct fileops socketops;
120:
1.54 lukem 121: extern int somaxconn; /* patchable (XXX sysctl) */
122: int somaxconn = SOMAXCONN;
1.160 ad 123: kmutex_t *softnet_lock;
1.49 jonathan 124:
1.64 thorpej 125: #ifdef SOSEND_COUNTERS
126: #include <sys/device.h>
127:
1.113 thorpej 128: static struct evcnt sosend_loan_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64 thorpej 129: NULL, "sosend", "loan big");
1.113 thorpej 130: static struct evcnt sosend_copy_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64 thorpej 131: NULL, "sosend", "copy big");
1.113 thorpej 132: static struct evcnt sosend_copy_small = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64 thorpej 133: NULL, "sosend", "copy small");
1.113 thorpej 134: static struct evcnt sosend_kvalimit = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64 thorpej 135: NULL, "sosend", "kva limit");
136:
137: #define SOSEND_COUNTER_INCR(ev) (ev)->ev_count++
138:
1.101 matt 139: EVCNT_ATTACH_STATIC(sosend_loan_big);
140: EVCNT_ATTACH_STATIC(sosend_copy_big);
141: EVCNT_ATTACH_STATIC(sosend_copy_small);
142: EVCNT_ATTACH_STATIC(sosend_kvalimit);
1.64 thorpej 143: #else
144:
145: #define SOSEND_COUNTER_INCR(ev) /* nothing */
146:
147: #endif /* SOSEND_COUNTERS */
148:
1.167 ad 149: #if defined(SOSEND_NO_LOAN) || defined(MULTIPROCESSOR)
1.121 yamt 150: int sock_loan_thresh = -1;
1.71 thorpej 151: #else
1.121 yamt 152: int sock_loan_thresh = 4096;
1.65 thorpej 153: #endif
1.64 thorpej 154:
1.136 ad 155: static kmutex_t so_pendfree_lock;
1.205 bouyer 156: static struct mbuf *so_pendfree = NULL;
1.64 thorpej 157:
1.84 ragge 158: #ifndef SOMAXKVA
159: #define SOMAXKVA (16 * 1024 * 1024)
160: #endif
161: int somaxkva = SOMAXKVA;
1.113 thorpej 162: static int socurkva;
1.136 ad 163: static kcondvar_t socurkva_cv;
1.64 thorpej 164:
1.191 elad 165: static kauth_listener_t socket_listener;
166:
1.64 thorpej 167: #define SOCK_LOAN_CHUNK 65536
168:
1.205 bouyer 169: static void sopendfree_thread(void *);
170: static kcondvar_t pendfree_thread_cv;
171: static lwp_t *sopendfree_lwp;
1.93 yamt 172:
1.212 pooka 173: static void sysctl_kern_socket_setup(void);
1.178 pooka 174: static struct sysctllog *socket_sysctllog;
175:
1.113 thorpej 176: static vsize_t
1.129 yamt 177: sokvareserve(struct socket *so, vsize_t len)
1.80 yamt 178: {
1.98 christos 179: int error;
1.80 yamt 180:
1.136 ad 181: mutex_enter(&so_pendfree_lock);
1.80 yamt 182: while (socurkva + len > somaxkva) {
183: SOSEND_COUNTER_INCR(&sosend_kvalimit);
1.136 ad 184: error = cv_wait_sig(&socurkva_cv, &so_pendfree_lock);
1.98 christos 185: if (error) {
186: len = 0;
187: break;
188: }
1.80 yamt 189: }
1.93 yamt 190: socurkva += len;
1.136 ad 191: mutex_exit(&so_pendfree_lock);
1.98 christos 192: return len;
1.95 yamt 193: }
194:
1.113 thorpej 195: static void
1.95 yamt 196: sokvaunreserve(vsize_t len)
197: {
198:
1.136 ad 199: mutex_enter(&so_pendfree_lock);
1.95 yamt 200: socurkva -= len;
1.136 ad 201: cv_broadcast(&socurkva_cv);
202: mutex_exit(&so_pendfree_lock);
1.95 yamt 203: }
204:
205: /*
206: * sokvaalloc: allocate kva for loan.
207: */
208:
209: vaddr_t
1.209 matt 210: sokvaalloc(vaddr_t sva, vsize_t len, struct socket *so)
1.95 yamt 211: {
212: vaddr_t lva;
213:
214: /*
215: * reserve kva.
216: */
217:
1.98 christos 218: if (sokvareserve(so, len) == 0)
219: return 0;
1.93 yamt 220:
221: /*
222: * allocate kva.
223: */
1.80 yamt 224:
1.209 matt 225: lva = uvm_km_alloc(kernel_map, len, atop(sva) & uvmexp.colormask,
226: UVM_KMF_COLORMATCH | UVM_KMF_VAONLY | UVM_KMF_WAITVA);
1.95 yamt 227: if (lva == 0) {
228: sokvaunreserve(len);
1.80 yamt 229: return (0);
1.95 yamt 230: }
1.80 yamt 231:
232: return lva;
233: }
234:
1.93 yamt 235: /*
236: * sokvafree: free kva for loan.
237: */
238:
1.80 yamt 239: void
240: sokvafree(vaddr_t sva, vsize_t len)
241: {
1.93 yamt 242:
243: /*
244: * free kva.
245: */
1.80 yamt 246:
1.109 yamt 247: uvm_km_free(kernel_map, sva, len, UVM_KMF_VAONLY);
1.93 yamt 248:
249: /*
250: * unreserve kva.
251: */
252:
1.95 yamt 253: sokvaunreserve(len);
1.80 yamt 254: }
255:
1.64 thorpej 256: static void
1.134 christos 257: sodoloanfree(struct vm_page **pgs, void *buf, size_t size)
1.64 thorpej 258: {
1.156 yamt 259: vaddr_t sva, eva;
1.64 thorpej 260: vsize_t len;
1.156 yamt 261: int npgs;
262:
263: KASSERT(pgs != NULL);
1.64 thorpej 264:
265: eva = round_page((vaddr_t) buf + size);
266: sva = trunc_page((vaddr_t) buf);
267: len = eva - sva;
268: npgs = len >> PAGE_SHIFT;
269:
270: pmap_kremove(sva, len);
271: pmap_update(pmap_kernel());
272: uvm_unloan(pgs, npgs, UVM_LOAN_TOPAGE);
1.80 yamt 273: sokvafree(sva, len);
1.64 thorpej 274: }
275:
1.93 yamt 276: /*
1.205 bouyer 277: * sopendfree_thread: free mbufs on "pendfree" list.
1.136 ad 278: * unlock and relock so_pendfree_lock when freeing mbufs.
1.93 yamt 279: */
280:
1.205 bouyer 281: static void
282: sopendfree_thread(void *v)
1.93 yamt 283: {
1.137 ad 284: struct mbuf *m, *next;
1.205 bouyer 285: size_t rv;
1.93 yamt 286:
1.205 bouyer 287: mutex_enter(&so_pendfree_lock);
1.64 thorpej 288:
1.205 bouyer 289: for (;;) {
290: rv = 0;
291: while (so_pendfree != NULL) {
292: m = so_pendfree;
293: so_pendfree = NULL;
294: mutex_exit(&so_pendfree_lock);
295:
296: for (; m != NULL; m = next) {
297: next = m->m_next;
298: KASSERT((~m->m_flags & (M_EXT|M_EXT_PAGES)) == 0);
299: KASSERT(m->m_ext.ext_refcnt == 0);
300:
301: rv += m->m_ext.ext_size;
302: sodoloanfree(m->m_ext.ext_pgs, m->m_ext.ext_buf,
303: m->m_ext.ext_size);
304: pool_cache_put(mb_cache, m);
305: }
1.93 yamt 306:
1.205 bouyer 307: mutex_enter(&so_pendfree_lock);
1.93 yamt 308: }
1.205 bouyer 309: if (rv)
310: cv_broadcast(&socurkva_cv);
311: cv_wait(&pendfree_thread_cv, &so_pendfree_lock);
1.64 thorpej 312: }
1.205 bouyer 313: panic("sopendfree_thread");
314: /* NOTREACHED */
1.64 thorpej 315: }
316:
1.80 yamt 317: void
1.134 christos 318: soloanfree(struct mbuf *m, void *buf, size_t size, void *arg)
1.64 thorpej 319: {
320:
1.156 yamt 321: KASSERT(m != NULL);
1.64 thorpej 322:
1.93 yamt 323: /*
324: * postpone freeing mbuf.
325: *
326: * we can't do it in interrupt context
327: * because we need to put kva back to kernel_map.
328: */
329:
1.136 ad 330: mutex_enter(&so_pendfree_lock);
1.92 yamt 331: m->m_next = so_pendfree;
332: so_pendfree = m;
1.205 bouyer 333: cv_signal(&pendfree_thread_cv);
1.136 ad 334: mutex_exit(&so_pendfree_lock);
1.64 thorpej 335: }
336:
337: static long
338: sosend_loan(struct socket *so, struct uio *uio, struct mbuf *m, long space)
339: {
340: struct iovec *iov = uio->uio_iov;
341: vaddr_t sva, eva;
342: vsize_t len;
1.156 yamt 343: vaddr_t lva;
344: int npgs, error;
345: vaddr_t va;
346: int i;
1.64 thorpej 347:
1.116 yamt 348: if (VMSPACE_IS_KERNEL_P(uio->uio_vmspace))
1.64 thorpej 349: return (0);
350:
351: if (iov->iov_len < (size_t) space)
352: space = iov->iov_len;
353: if (space > SOCK_LOAN_CHUNK)
354: space = SOCK_LOAN_CHUNK;
355:
356: eva = round_page((vaddr_t) iov->iov_base + space);
357: sva = trunc_page((vaddr_t) iov->iov_base);
358: len = eva - sva;
359: npgs = len >> PAGE_SHIFT;
360:
1.79 thorpej 361: KASSERT(npgs <= M_EXT_MAXPAGES);
362:
1.209 matt 363: lva = sokvaalloc(sva, len, so);
1.64 thorpej 364: if (lva == 0)
1.80 yamt 365: return 0;
1.64 thorpej 366:
1.116 yamt 367: error = uvm_loan(&uio->uio_vmspace->vm_map, sva, len,
1.79 thorpej 368: m->m_ext.ext_pgs, UVM_LOAN_TOPAGE);
1.64 thorpej 369: if (error) {
1.80 yamt 370: sokvafree(lva, len);
1.64 thorpej 371: return (0);
372: }
373:
374: for (i = 0, va = lva; i < npgs; i++, va += PAGE_SIZE)
1.79 thorpej 375: pmap_kenter_pa(va, VM_PAGE_TO_PHYS(m->m_ext.ext_pgs[i]),
1.194 cegger 376: VM_PROT_READ, 0);
1.64 thorpej 377: pmap_update(pmap_kernel());
378:
379: lva += (vaddr_t) iov->iov_base & PAGE_MASK;
380:
1.134 christos 381: MEXTADD(m, (void *) lva, space, M_MBUF, soloanfree, so);
1.79 thorpej 382: m->m_flags |= M_EXT_PAGES | M_EXT_ROMAP;
1.64 thorpej 383:
384: uio->uio_resid -= space;
385: /* uio_offset not updated, not set/used for write(2) */
1.134 christos 386: uio->uio_iov->iov_base = (char *)uio->uio_iov->iov_base + space;
1.64 thorpej 387: uio->uio_iov->iov_len -= space;
388: if (uio->uio_iov->iov_len == 0) {
389: uio->uio_iov++;
390: uio->uio_iovcnt--;
391: }
392:
393: return (space);
394: }
395:
1.142 dyoung 396: struct mbuf *
1.147 dyoung 397: getsombuf(struct socket *so, int type)
1.142 dyoung 398: {
399: struct mbuf *m;
400:
1.147 dyoung 401: m = m_get(M_WAIT, type);
1.142 dyoung 402: MCLAIM(m, so->so_mowner);
403: return m;
404: }
405:
1.191 elad 406: static int
407: socket_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie,
408: void *arg0, void *arg1, void *arg2, void *arg3)
409: {
410: int result;
411: enum kauth_network_req req;
412:
413: result = KAUTH_RESULT_DEFER;
414: req = (enum kauth_network_req)arg0;
415:
1.193 elad 416: if ((action != KAUTH_NETWORK_SOCKET) &&
417: (action != KAUTH_NETWORK_BIND))
1.191 elad 418: return result;
419:
420: switch (req) {
1.193 elad 421: case KAUTH_REQ_NETWORK_BIND_PORT:
422: result = KAUTH_RESULT_ALLOW;
423: break;
424:
1.191 elad 425: case KAUTH_REQ_NETWORK_SOCKET_DROP: {
426: /* Normal users can only drop their own connections. */
427: struct socket *so = (struct socket *)arg1;
428:
1.220 christos 429: if (so->so_cred && proc_uidmatch(cred, so->so_cred) == 0)
1.191 elad 430: result = KAUTH_RESULT_ALLOW;
431:
432: break;
433: }
434:
435: case KAUTH_REQ_NETWORK_SOCKET_OPEN:
436: /* We allow "raw" routing/bluetooth sockets to anyone. */
1.203 matt 437: if ((u_long)arg1 == PF_ROUTE || (u_long)arg1 == PF_OROUTE
438: || (u_long)arg1 == PF_BLUETOOTH) {
1.191 elad 439: result = KAUTH_RESULT_ALLOW;
1.203 matt 440: } else {
1.191 elad 441: /* Privileged, let secmodel handle this. */
442: if ((u_long)arg2 == SOCK_RAW)
443: break;
444: }
445:
446: result = KAUTH_RESULT_ALLOW;
447:
448: break;
449:
1.192 elad 450: case KAUTH_REQ_NETWORK_SOCKET_CANSEE:
451: result = KAUTH_RESULT_ALLOW;
452:
453: break;
454:
1.191 elad 455: default:
456: break;
457: }
458:
459: return result;
460: }
461:
1.119 yamt 462: void
463: soinit(void)
464: {
465:
1.212 pooka 466: sysctl_kern_socket_setup();
1.178 pooka 467:
1.148 ad 468: mutex_init(&so_pendfree_lock, MUTEX_DEFAULT, IPL_VM);
1.160 ad 469: softnet_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
1.136 ad 470: cv_init(&socurkva_cv, "sokva");
1.205 bouyer 471: cv_init(&pendfree_thread_cv, "sopendfr");
1.166 ad 472: soinit2();
1.136 ad 473:
1.119 yamt 474: /* Set the initial adjusted socket buffer size. */
475: if (sb_max_set(sb_max))
476: panic("bad initial sb_max value: %lu", sb_max);
477:
1.191 elad 478: socket_listener = kauth_listen_scope(KAUTH_SCOPE_NETWORK,
479: socket_listener_cb, NULL);
1.119 yamt 480: }
481:
1.205 bouyer 482: void
483: soinit1(void)
484: {
485: int error = kthread_create(PRI_NONE, KTHREAD_MPSAFE, NULL,
486: sopendfree_thread, NULL, &sopendfree_lwp, "sopendfree");
487: if (error)
488: panic("soinit1 %d", error);
489: }
490:
1.1 cgd 491: /*
1.222 rmind 492: * socreate: create a new socket of the specified type and the protocol.
493: *
494: * => Caller may specify another socket for lock sharing (must not be held).
495: * => Returns the new socket without lock held.
1.224 rmind 496: */
1.3 andrew 497: int
1.160 ad 498: socreate(int dom, struct socket **aso, int type, int proto, struct lwp *l,
499: struct socket *lockso)
1.1 cgd 500: {
1.99 matt 501: const struct protosw *prp;
1.54 lukem 502: struct socket *so;
1.115 yamt 503: uid_t uid;
1.160 ad 504: int error;
505: kmutex_t *lock;
1.1 cgd 506:
1.132 elad 507: error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_SOCKET,
508: KAUTH_REQ_NETWORK_SOCKET_OPEN, KAUTH_ARG(dom), KAUTH_ARG(type),
509: KAUTH_ARG(proto));
1.140 dyoung 510: if (error != 0)
511: return error;
1.127 elad 512:
1.1 cgd 513: if (proto)
514: prp = pffindproto(dom, proto, type);
515: else
516: prp = pffindtype(dom, type);
1.140 dyoung 517: if (prp == NULL) {
1.120 ginsbach 518: /* no support for domain */
519: if (pffinddomain(dom) == 0)
1.140 dyoung 520: return EAFNOSUPPORT;
1.120 ginsbach 521: /* no support for socket type */
522: if (proto == 0 && type != 0)
1.140 dyoung 523: return EPROTOTYPE;
524: return EPROTONOSUPPORT;
1.120 ginsbach 525: }
1.223 rmind 526: if (prp->pr_usrreqs == NULL)
1.140 dyoung 527: return EPROTONOSUPPORT;
1.1 cgd 528: if (prp->pr_type != type)
1.140 dyoung 529: return EPROTOTYPE;
1.160 ad 530:
531: so = soget(true);
1.1 cgd 532: so->so_type = type;
533: so->so_proto = prp;
1.33 matt 534: so->so_send = sosend;
535: so->so_receive = soreceive;
1.78 matt 536: #ifdef MBUFTRACE
537: so->so_rcv.sb_mowner = &prp->pr_domain->dom_mowner;
538: so->so_snd.sb_mowner = &prp->pr_domain->dom_mowner;
539: so->so_mowner = &prp->pr_domain->dom_mowner;
540: #endif
1.138 rmind 541: uid = kauth_cred_geteuid(l->l_cred);
1.115 yamt 542: so->so_uidinfo = uid_find(uid);
1.168 yamt 543: so->so_cpid = l->l_proc->p_pid;
1.224 rmind 544:
545: /*
546: * Lock assigned and taken during PCB attach, unless we share
547: * the lock with another socket, e.g. socketpair(2) case.
548: */
549: if (lockso) {
1.160 ad 550: lock = lockso->so_lock;
551: so->so_lock = lock;
552: mutex_obj_hold(lock);
553: mutex_enter(lock);
554: }
1.224 rmind 555:
556: /* Attach the PCB (returns with the socket lock held). */
557: error = (*prp->pr_usrreqs->pr_attach)(so, proto);
1.160 ad 558: KASSERT(solocked(so));
1.224 rmind 559:
560: if (error) {
1.222 rmind 561: KASSERT(so->so_pcb == NULL);
1.1 cgd 562: so->so_state |= SS_NOFDREF;
563: sofree(so);
1.140 dyoung 564: return error;
1.1 cgd 565: }
1.198 elad 566: so->so_cred = kauth_cred_dup(l->l_cred);
1.160 ad 567: sounlock(so);
1.224 rmind 568:
1.1 cgd 569: *aso = so;
1.140 dyoung 570: return 0;
1.1 cgd 571: }
572:
1.222 rmind 573: /*
574: * fsocreate: create a socket and a file descriptor associated with it.
575: *
576: * => On success, write file descriptor to fdout and return zero.
577: * => On failure, return non-zero; *fdout will be undefined.
1.142 dyoung 578: */
579: int
1.222 rmind 580: fsocreate(int domain, struct socket **sop, int type, int proto, int *fdout)
1.142 dyoung 581: {
1.222 rmind 582: lwp_t *l = curlwp;
583: int error, fd, flags;
584: struct socket *so;
585: struct file *fp;
1.142 dyoung 586:
1.222 rmind 587: if ((error = fd_allocfile(&fp, &fd)) != 0) {
1.204 christos 588: return error;
1.222 rmind 589: }
590: flags = type & SOCK_FLAGS_MASK;
1.204 christos 591: fd_set_exclose(l, fd, (flags & SOCK_CLOEXEC) != 0);
1.207 christos 592: fp->f_flag = FREAD|FWRITE|((flags & SOCK_NONBLOCK) ? FNONBLOCK : 0)|
593: ((flags & SOCK_NOSIGPIPE) ? FNOSIGPIPE : 0);
1.142 dyoung 594: fp->f_type = DTYPE_SOCKET;
595: fp->f_ops = &socketops;
1.222 rmind 596:
597: type &= ~SOCK_FLAGS_MASK;
598: error = socreate(domain, &so, type, proto, l, NULL);
599: if (error) {
1.155 ad 600: fd_abort(curproc, fp, fd);
1.222 rmind 601: return error;
602: }
603: if (flags & SOCK_NONBLOCK) {
604: so->so_state |= SS_NBIO;
605: }
1.235 matt 606: fp->f_socket = so;
1.222 rmind 607: fd_affix(curproc, fp, fd);
608:
609: if (sop != NULL) {
610: *sop = so;
1.142 dyoung 611: }
1.222 rmind 612: *fdout = fd;
1.142 dyoung 613: return error;
614: }
615:
1.3 andrew 616: int
1.190 dyoung 617: sofamily(const struct socket *so)
618: {
619: const struct protosw *pr;
620: const struct domain *dom;
621:
622: if ((pr = so->so_proto) == NULL)
623: return AF_UNSPEC;
624: if ((dom = pr->pr_domain) == NULL)
625: return AF_UNSPEC;
626: return dom->dom_family;
627: }
628:
629: int
1.236 rtr 630: sobind(struct socket *so, struct sockaddr *nam, struct lwp *l)
1.1 cgd 631: {
1.160 ad 632: int error;
1.1 cgd 633:
1.160 ad 634: solock(so);
1.237 rtr 635: if (nam->sa_family != so->so_proto->pr_domain->dom_family) {
636: sounlock(so);
1.238 rtr 637: return EAFNOSUPPORT;
1.237 rtr 638: }
1.231 rtr 639: error = (*so->so_proto->pr_usrreqs->pr_bind)(so, nam, l);
1.160 ad 640: sounlock(so);
1.140 dyoung 641: return error;
1.1 cgd 642: }
643:
1.3 andrew 644: int
1.150 elad 645: solisten(struct socket *so, int backlog, struct lwp *l)
1.1 cgd 646: {
1.160 ad 647: int error;
1.247 rjs 648: short oldopt, oldqlimit;
1.1 cgd 649:
1.160 ad 650: solock(so);
1.158 ad 651: if ((so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING |
1.163 ad 652: SS_ISDISCONNECTING)) != 0) {
1.222 rmind 653: sounlock(so);
654: return EINVAL;
1.163 ad 655: }
1.247 rjs 656: oldopt = so->so_options;
657: oldqlimit = so->so_qlimit;
658: if (TAILQ_EMPTY(&so->so_q))
659: so->so_options |= SO_ACCEPTCONN;
660: if (backlog < 0)
661: backlog = 0;
662: so->so_qlimit = min(backlog, somaxconn);
663:
1.231 rtr 664: error = (*so->so_proto->pr_usrreqs->pr_listen)(so, l);
1.140 dyoung 665: if (error != 0) {
1.247 rjs 666: so->so_options = oldopt;
667: so->so_qlimit = oldqlimit;
1.160 ad 668: sounlock(so);
1.140 dyoung 669: return error;
1.1 cgd 670: }
1.160 ad 671: sounlock(so);
1.140 dyoung 672: return 0;
1.1 cgd 673: }
674:
1.21 christos 675: void
1.54 lukem 676: sofree(struct socket *so)
1.1 cgd 677: {
1.161 ad 678: u_int refs;
1.1 cgd 679:
1.160 ad 680: KASSERT(solocked(so));
681:
682: if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0) {
683: sounlock(so);
1.1 cgd 684: return;
1.160 ad 685: }
1.43 mycroft 686: if (so->so_head) {
687: /*
688: * We must not decommission a socket that's on the accept(2)
689: * queue. If we do, then accept(2) may hang after select(2)
690: * indicated that the listening socket was ready.
691: */
1.160 ad 692: if (!soqremque(so, 0)) {
693: sounlock(so);
1.43 mycroft 694: return;
1.160 ad 695: }
1.43 mycroft 696: }
1.98 christos 697: if (so->so_rcv.sb_hiwat)
1.110 christos 698: (void)chgsbsize(so->so_uidinfo, &so->so_rcv.sb_hiwat, 0,
1.98 christos 699: RLIM_INFINITY);
700: if (so->so_snd.sb_hiwat)
1.110 christos 701: (void)chgsbsize(so->so_uidinfo, &so->so_snd.sb_hiwat, 0,
1.98 christos 702: RLIM_INFINITY);
703: sbrelease(&so->so_snd, so);
1.160 ad 704: KASSERT(!cv_has_waiters(&so->so_cv));
705: KASSERT(!cv_has_waiters(&so->so_rcv.sb_cv));
706: KASSERT(!cv_has_waiters(&so->so_snd.sb_cv));
1.1 cgd 707: sorflush(so);
1.161 ad 708: refs = so->so_aborting; /* XXX */
1.177 ad 709: /* Remove acccept filter if one is present. */
1.170 tls 710: if (so->so_accf != NULL)
1.177 ad 711: (void)accept_filt_clear(so);
1.160 ad 712: sounlock(so);
1.161 ad 713: if (refs == 0) /* XXX */
714: soput(so);
1.1 cgd 715: }
716:
717: /*
1.222 rmind 718: * soclose: close a socket on last file table reference removal.
719: * Initiate disconnect if connected. Free socket when disconnect complete.
1.1 cgd 720: */
1.3 andrew 721: int
1.54 lukem 722: soclose(struct socket *so)
1.1 cgd 723: {
1.222 rmind 724: struct socket *so2;
725: int error = 0;
1.1 cgd 726:
1.160 ad 727: solock(so);
1.1 cgd 728: if (so->so_options & SO_ACCEPTCONN) {
1.172 ad 729: for (;;) {
730: if ((so2 = TAILQ_FIRST(&so->so_q0)) != 0) {
1.160 ad 731: KASSERT(solocked2(so, so2));
732: (void) soqremque(so2, 0);
733: /* soabort drops the lock. */
734: (void) soabort(so2);
735: solock(so);
1.172 ad 736: continue;
1.160 ad 737: }
1.172 ad 738: if ((so2 = TAILQ_FIRST(&so->so_q)) != 0) {
1.160 ad 739: KASSERT(solocked2(so, so2));
740: (void) soqremque(so2, 1);
741: /* soabort drops the lock. */
742: (void) soabort(so2);
743: solock(so);
1.172 ad 744: continue;
1.160 ad 745: }
1.172 ad 746: break;
747: }
1.1 cgd 748: }
1.222 rmind 749: if (so->so_pcb == NULL)
1.1 cgd 750: goto discard;
751: if (so->so_state & SS_ISCONNECTED) {
752: if ((so->so_state & SS_ISDISCONNECTING) == 0) {
753: error = sodisconnect(so);
754: if (error)
755: goto drop;
756: }
757: if (so->so_options & SO_LINGER) {
1.206 christos 758: if ((so->so_state & (SS_ISDISCONNECTING|SS_NBIO)) ==
759: (SS_ISDISCONNECTING|SS_NBIO))
1.1 cgd 760: goto drop;
1.21 christos 761: while (so->so_state & SS_ISCONNECTED) {
1.185 yamt 762: error = sowait(so, true, so->so_linger * hz);
1.21 christos 763: if (error)
1.1 cgd 764: break;
1.21 christos 765: }
1.1 cgd 766: }
767: }
1.54 lukem 768: drop:
1.1 cgd 769: if (so->so_pcb) {
1.224 rmind 770: KASSERT(solocked(so));
771: (*so->so_proto->pr_usrreqs->pr_detach)(so);
1.1 cgd 772: }
1.54 lukem 773: discard:
1.222 rmind 774: KASSERT((so->so_state & SS_NOFDREF) == 0);
1.198 elad 775: kauth_cred_free(so->so_cred);
1.1 cgd 776: so->so_state |= SS_NOFDREF;
777: sofree(so);
1.222 rmind 778: return error;
1.1 cgd 779: }
780:
781: /*
1.160 ad 782: * Must be called with the socket locked.. Will return with it unlocked.
1.1 cgd 783: */
1.3 andrew 784: int
1.54 lukem 785: soabort(struct socket *so)
1.1 cgd 786: {
1.161 ad 787: u_int refs;
1.139 yamt 788: int error;
1.160 ad 789:
790: KASSERT(solocked(so));
791: KASSERT(so->so_head == NULL);
1.1 cgd 792:
1.161 ad 793: so->so_aborting++; /* XXX */
1.230 mrg 794: error = (*so->so_proto->pr_usrreqs->pr_abort)(so);
1.161 ad 795: refs = --so->so_aborting; /* XXX */
1.164 drochner 796: if (error || (refs == 0)) {
1.139 yamt 797: sofree(so);
1.160 ad 798: } else {
799: sounlock(so);
1.139 yamt 800: }
801: return error;
1.1 cgd 802: }
803:
1.3 andrew 804: int
1.239 rtr 805: soaccept(struct socket *so, struct sockaddr *nam)
1.1 cgd 806: {
1.222 rmind 807: int error;
1.160 ad 808:
809: KASSERT(solocked(so));
1.222 rmind 810: KASSERT((so->so_state & SS_NOFDREF) != 0);
1.1 cgd 811:
812: so->so_state &= ~SS_NOFDREF;
1.55 thorpej 813: if ((so->so_state & SS_ISDISCONNECTED) == 0 ||
814: (so->so_proto->pr_flags & PR_ABRTACPTDIS) == 0)
1.225 rtr 815: error = (*so->so_proto->pr_usrreqs->pr_accept)(so, nam);
1.41 mycroft 816: else
1.53 itojun 817: error = ECONNABORTED;
1.52 itojun 818:
1.222 rmind 819: return error;
1.1 cgd 820: }
821:
1.3 andrew 822: int
1.240 rtr 823: soconnect(struct socket *so, struct sockaddr *nam, struct lwp *l)
1.1 cgd 824: {
1.222 rmind 825: int error;
1.160 ad 826:
827: KASSERT(solocked(so));
1.1 cgd 828:
829: if (so->so_options & SO_ACCEPTCONN)
1.222 rmind 830: return EOPNOTSUPP;
1.1 cgd 831: /*
832: * If protocol is connection-based, can only connect once.
833: * Otherwise, if connected, try to disconnect first.
834: * This allows user to disconnect by connecting to, e.g.,
835: * a null address.
836: */
837: if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
838: ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
1.241 rtr 839: (error = sodisconnect(so)))) {
1.1 cgd 840: error = EISCONN;
1.241 rtr 841: } else {
1.242 rtr 842: if (nam->sa_family != so->so_proto->pr_domain->dom_family) {
1.241 rtr 843: return EAFNOSUPPORT;
844: }
1.231 rtr 845: error = (*so->so_proto->pr_usrreqs->pr_connect)(so, nam, l);
1.241 rtr 846: }
1.222 rmind 847:
848: return error;
1.1 cgd 849: }
850:
1.3 andrew 851: int
1.54 lukem 852: soconnect2(struct socket *so1, struct socket *so2)
1.1 cgd 853: {
1.160 ad 854: KASSERT(solocked2(so1, so2));
1.1 cgd 855:
1.234 rtr 856: return (*so1->so_proto->pr_usrreqs->pr_connect2)(so1, so2);
1.1 cgd 857: }
858:
1.3 andrew 859: int
1.54 lukem 860: sodisconnect(struct socket *so)
1.1 cgd 861: {
1.160 ad 862: int error;
863:
864: KASSERT(solocked(so));
1.1 cgd 865:
866: if ((so->so_state & SS_ISCONNECTED) == 0) {
867: error = ENOTCONN;
1.160 ad 868: } else if (so->so_state & SS_ISDISCONNECTING) {
1.1 cgd 869: error = EALREADY;
1.160 ad 870: } else {
1.229 rtr 871: error = (*so->so_proto->pr_usrreqs->pr_disconnect)(so);
1.1 cgd 872: }
873: return (error);
874: }
875:
1.15 mycroft 876: #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK)
1.1 cgd 877: /*
878: * Send on a socket.
879: * If send must go all at once and message is larger than
880: * send buffering, then hard error.
881: * Lock against other senders.
882: * If must go all at once and not enough room now, then
883: * inform user that this would block and do nothing.
884: * Otherwise, if nonblocking, send as much as possible.
885: * The data to be sent is described by "uio" if nonzero,
886: * otherwise by the mbuf chain "top" (which must be null
887: * if uio is not). Data provided in mbuf chain must be small
888: * enough to send all at once.
889: *
890: * Returns nonzero on error, timeout or signal; callers
891: * must check for short counts if EINTR/ERESTART are returned.
892: * Data and control buffers are freed on return.
893: */
1.3 andrew 894: int
1.245 rtr 895: sosend(struct socket *so, struct sockaddr *addr, struct uio *uio,
896: struct mbuf *top, struct mbuf *control, int flags, struct lwp *l)
1.1 cgd 897: {
1.54 lukem 898: struct mbuf **mp, *m;
1.58 jdolecek 899: long space, len, resid, clen, mlen;
900: int error, s, dontroute, atomic;
1.196 dsl 901: short wakeup_state = 0;
1.54 lukem 902:
1.160 ad 903: clen = 0;
1.64 thorpej 904:
1.160 ad 905: /*
906: * solock() provides atomicity of access. splsoftnet() prevents
907: * protocol processing soft interrupts from interrupting us and
908: * blocking (expensive).
909: */
910: s = splsoftnet();
911: solock(so);
1.54 lukem 912: atomic = sosendallatonce(so) || top;
1.1 cgd 913: if (uio)
914: resid = uio->uio_resid;
915: else
916: resid = top->m_pkthdr.len;
1.7 cgd 917: /*
918: * In theory resid should be unsigned.
919: * However, space must be signed, as it might be less than 0
920: * if we over-committed, and we must use a signed comparison
921: * of space and resid. On the other hand, a negative resid
922: * causes us to loop sending 0-length segments to the protocol.
923: */
1.29 mycroft 924: if (resid < 0) {
925: error = EINVAL;
926: goto out;
927: }
1.1 cgd 928: dontroute =
929: (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
930: (so->so_proto->pr_flags & PR_ATOMIC);
1.165 christos 931: l->l_ru.ru_msgsnd++;
1.1 cgd 932: if (control)
933: clen = control->m_len;
1.54 lukem 934: restart:
1.21 christos 935: if ((error = sblock(&so->so_snd, SBLOCKWAIT(flags))) != 0)
1.1 cgd 936: goto out;
937: do {
1.160 ad 938: if (so->so_state & SS_CANTSENDMORE) {
939: error = EPIPE;
940: goto release;
941: }
1.48 thorpej 942: if (so->so_error) {
943: error = so->so_error;
944: so->so_error = 0;
945: goto release;
946: }
1.1 cgd 947: if ((so->so_state & SS_ISCONNECTED) == 0) {
948: if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
1.217 rmind 949: if (resid || clen == 0) {
1.160 ad 950: error = ENOTCONN;
951: goto release;
952: }
1.244 rtr 953: } else if (addr == NULL) {
1.160 ad 954: error = EDESTADDRREQ;
955: goto release;
956: }
1.1 cgd 957: }
958: space = sbspace(&so->so_snd);
959: if (flags & MSG_OOB)
960: space += 1024;
1.21 christos 961: if ((atomic && resid > so->so_snd.sb_hiwat) ||
1.160 ad 962: clen > so->so_snd.sb_hiwat) {
963: error = EMSGSIZE;
964: goto release;
965: }
1.96 mycroft 966: if (space < resid + clen &&
1.1 cgd 967: (atomic || space < so->so_snd.sb_lowat || space < clen)) {
1.206 christos 968: if ((so->so_state & SS_NBIO) || (flags & MSG_NBIO)) {
1.160 ad 969: error = EWOULDBLOCK;
970: goto release;
971: }
1.1 cgd 972: sbunlock(&so->so_snd);
1.196 dsl 973: if (wakeup_state & SS_RESTARTSYS) {
974: error = ERESTART;
975: goto out;
976: }
1.1 cgd 977: error = sbwait(&so->so_snd);
978: if (error)
979: goto out;
1.196 dsl 980: wakeup_state = so->so_state;
1.1 cgd 981: goto restart;
982: }
1.196 dsl 983: wakeup_state = 0;
1.1 cgd 984: mp = ⊤
985: space -= clen;
986: do {
1.45 tv 987: if (uio == NULL) {
988: /*
989: * Data is prepackaged in "top".
990: */
991: resid = 0;
992: if (flags & MSG_EOR)
993: top->m_flags |= M_EOR;
994: } else do {
1.160 ad 995: sounlock(so);
996: splx(s);
1.144 dyoung 997: if (top == NULL) {
1.78 matt 998: m = m_gethdr(M_WAIT, MT_DATA);
1.45 tv 999: mlen = MHLEN;
1000: m->m_pkthdr.len = 0;
1.248 ozaki-r 1001: m_reset_rcvif(m);
1.45 tv 1002: } else {
1.78 matt 1003: m = m_get(M_WAIT, MT_DATA);
1.45 tv 1004: mlen = MLEN;
1005: }
1.78 matt 1006: MCLAIM(m, so->so_snd.sb_mowner);
1.121 yamt 1007: if (sock_loan_thresh >= 0 &&
1008: uio->uio_iov->iov_len >= sock_loan_thresh &&
1009: space >= sock_loan_thresh &&
1.64 thorpej 1010: (len = sosend_loan(so, uio, m,
1011: space)) != 0) {
1012: SOSEND_COUNTER_INCR(&sosend_loan_big);
1013: space -= len;
1014: goto have_data;
1015: }
1.45 tv 1016: if (resid >= MINCLSIZE && space >= MCLBYTES) {
1.64 thorpej 1017: SOSEND_COUNTER_INCR(&sosend_copy_big);
1.201 oki 1018: m_clget(m, M_DONTWAIT);
1.45 tv 1019: if ((m->m_flags & M_EXT) == 0)
1020: goto nopages;
1021: mlen = MCLBYTES;
1022: if (atomic && top == 0) {
1.58 jdolecek 1023: len = lmin(MCLBYTES - max_hdr,
1.54 lukem 1024: resid);
1.45 tv 1025: m->m_data += max_hdr;
1026: } else
1.58 jdolecek 1027: len = lmin(MCLBYTES, resid);
1.45 tv 1028: space -= len;
1029: } else {
1.64 thorpej 1030: nopages:
1031: SOSEND_COUNTER_INCR(&sosend_copy_small);
1.58 jdolecek 1032: len = lmin(lmin(mlen, resid), space);
1.45 tv 1033: space -= len;
1034: /*
1035: * For datagram protocols, leave room
1036: * for protocol headers in first mbuf.
1037: */
1038: if (atomic && top == 0 && len < mlen)
1039: MH_ALIGN(m, len);
1040: }
1.144 dyoung 1041: error = uiomove(mtod(m, void *), (int)len, uio);
1.64 thorpej 1042: have_data:
1.45 tv 1043: resid = uio->uio_resid;
1044: m->m_len = len;
1045: *mp = m;
1046: top->m_pkthdr.len += len;
1.160 ad 1047: s = splsoftnet();
1048: solock(so);
1.144 dyoung 1049: if (error != 0)
1.45 tv 1050: goto release;
1051: mp = &m->m_next;
1052: if (resid <= 0) {
1053: if (flags & MSG_EOR)
1054: top->m_flags |= M_EOR;
1055: break;
1056: }
1057: } while (space > 0 && atomic);
1.108 perry 1058:
1.160 ad 1059: if (so->so_state & SS_CANTSENDMORE) {
1060: error = EPIPE;
1061: goto release;
1062: }
1.45 tv 1063: if (dontroute)
1064: so->so_options |= SO_DONTROUTE;
1065: if (resid > 0)
1066: so->so_state |= SS_MORETOCOME;
1.240 rtr 1067: if (flags & MSG_OOB) {
1.226 rtr 1068: error = (*so->so_proto->pr_usrreqs->pr_sendoob)(so,
1069: top, control);
1.240 rtr 1070: } else {
1.232 rtr 1071: error = (*so->so_proto->pr_usrreqs->pr_send)(so,
1.245 rtr 1072: top, addr, control, l);
1.240 rtr 1073: }
1.45 tv 1074: if (dontroute)
1075: so->so_options &= ~SO_DONTROUTE;
1076: if (resid > 0)
1077: so->so_state &= ~SS_MORETOCOME;
1078: clen = 0;
1.144 dyoung 1079: control = NULL;
1080: top = NULL;
1.45 tv 1081: mp = ⊤
1.144 dyoung 1082: if (error != 0)
1.1 cgd 1083: goto release;
1084: } while (resid && space > 0);
1085: } while (resid);
1086:
1.54 lukem 1087: release:
1.1 cgd 1088: sbunlock(&so->so_snd);
1.54 lukem 1089: out:
1.160 ad 1090: sounlock(so);
1091: splx(s);
1.1 cgd 1092: if (top)
1093: m_freem(top);
1094: if (control)
1095: m_freem(control);
1096: return (error);
1097: }
1098:
1099: /*
1.159 ad 1100: * Following replacement or removal of the first mbuf on the first
1101: * mbuf chain of a socket buffer, push necessary state changes back
1102: * into the socket buffer so that other consumers see the values
1103: * consistently. 'nextrecord' is the callers locally stored value of
1104: * the original value of sb->sb_mb->m_nextpkt which must be restored
1105: * when the lead mbuf changes. NOTE: 'nextrecord' may be NULL.
1106: */
1107: static void
1108: sbsync(struct sockbuf *sb, struct mbuf *nextrecord)
1109: {
1110:
1.160 ad 1111: KASSERT(solocked(sb->sb_so));
1112:
1.159 ad 1113: /*
1114: * First, update for the new value of nextrecord. If necessary,
1115: * make it the first record.
1116: */
1117: if (sb->sb_mb != NULL)
1118: sb->sb_mb->m_nextpkt = nextrecord;
1119: else
1120: sb->sb_mb = nextrecord;
1121:
1122: /*
1123: * Now update any dependent socket buffer fields to reflect
1124: * the new state. This is an inline of SB_EMPTY_FIXUP, with
1125: * the addition of a second clause that takes care of the
1126: * case where sb_mb has been updated, but remains the last
1127: * record.
1128: */
1129: if (sb->sb_mb == NULL) {
1130: sb->sb_mbtail = NULL;
1131: sb->sb_lastrecord = NULL;
1132: } else if (sb->sb_mb->m_nextpkt == NULL)
1133: sb->sb_lastrecord = sb->sb_mb;
1134: }
1135:
1136: /*
1.1 cgd 1137: * Implement receive operations on a socket.
1138: * We depend on the way that records are added to the sockbuf
1139: * by sbappend*. In particular, each record (mbufs linked through m_next)
1140: * must begin with an address if the protocol so specifies,
1141: * followed by an optional mbuf or mbufs containing ancillary data,
1142: * and then zero or more mbufs of data.
1143: * In order to avoid blocking network interrupts for the entire time here,
1144: * we splx() while doing the actual copy to user space.
1145: * Although the sockbuf is locked, new data may still be appended,
1146: * and thus we must maintain consistency of the sockbuf during that time.
1147: *
1148: * The caller may receive the data as a single mbuf chain by supplying
1149: * an mbuf **mp0 for use in returning the chain. The uio is then used
1150: * only for the count in uio_resid.
1151: */
1.3 andrew 1152: int
1.54 lukem 1153: soreceive(struct socket *so, struct mbuf **paddr, struct uio *uio,
1154: struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
1.1 cgd 1155: {
1.116 yamt 1156: struct lwp *l = curlwp;
1.160 ad 1157: struct mbuf *m, **mp, *mt;
1.211 chs 1158: size_t len, offset, moff, orig_resid;
1159: int atomic, flags, error, s, type;
1.99 matt 1160: const struct protosw *pr;
1.54 lukem 1161: struct mbuf *nextrecord;
1.67 he 1162: int mbuf_removed = 0;
1.146 dyoung 1163: const struct domain *dom;
1.196 dsl 1164: short wakeup_state = 0;
1.64 thorpej 1165:
1.54 lukem 1166: pr = so->so_proto;
1.146 dyoung 1167: atomic = pr->pr_flags & PR_ATOMIC;
1168: dom = pr->pr_domain;
1.1 cgd 1169: mp = mp0;
1.54 lukem 1170: type = 0;
1171: orig_resid = uio->uio_resid;
1.102 jonathan 1172:
1.144 dyoung 1173: if (paddr != NULL)
1174: *paddr = NULL;
1175: if (controlp != NULL)
1176: *controlp = NULL;
1177: if (flagsp != NULL)
1.1 cgd 1178: flags = *flagsp &~ MSG_EOR;
1179: else
1180: flags = 0;
1.66 enami 1181:
1.1 cgd 1182: if (flags & MSG_OOB) {
1183: m = m_get(M_WAIT, MT_DATA);
1.160 ad 1184: solock(so);
1.226 rtr 1185: error = (*pr->pr_usrreqs->pr_recvoob)(so, m, flags & MSG_PEEK);
1.160 ad 1186: sounlock(so);
1.1 cgd 1187: if (error)
1188: goto bad;
1189: do {
1.134 christos 1190: error = uiomove(mtod(m, void *),
1.211 chs 1191: MIN(uio->uio_resid, m->m_len), uio);
1.1 cgd 1192: m = m_free(m);
1.144 dyoung 1193: } while (uio->uio_resid > 0 && error == 0 && m);
1.54 lukem 1194: bad:
1.144 dyoung 1195: if (m != NULL)
1.1 cgd 1196: m_freem(m);
1.144 dyoung 1197: return error;
1.1 cgd 1198: }
1.144 dyoung 1199: if (mp != NULL)
1.140 dyoung 1200: *mp = NULL;
1.160 ad 1201:
1202: /*
1203: * solock() provides atomicity of access. splsoftnet() prevents
1204: * protocol processing soft interrupts from interrupting us and
1205: * blocking (expensive).
1206: */
1207: s = splsoftnet();
1208: solock(so);
1.54 lukem 1209: restart:
1.160 ad 1210: if ((error = sblock(&so->so_rcv, SBLOCKWAIT(flags))) != 0) {
1211: sounlock(so);
1212: splx(s);
1.144 dyoung 1213: return error;
1.160 ad 1214: }
1.1 cgd 1215:
1216: m = so->so_rcv.sb_mb;
1217: /*
1218: * If we have less data than requested, block awaiting more
1219: * (subject to any timeout) if:
1.15 mycroft 1220: * 1. the current count is less than the low water mark,
1.1 cgd 1221: * 2. MSG_WAITALL is set, and it is possible to do the entire
1.15 mycroft 1222: * receive operation at once if we block (resid <= hiwat), or
1223: * 3. MSG_DONTWAIT is not set.
1.1 cgd 1224: * If MSG_WAITALL is set but resid is larger than the receive buffer,
1225: * we have to do the receive in sections, and thus risk returning
1226: * a short count if a timeout or signal occurs after we start.
1227: */
1.144 dyoung 1228: if (m == NULL ||
1229: ((flags & MSG_DONTWAIT) == 0 &&
1230: so->so_rcv.sb_cc < uio->uio_resid &&
1231: (so->so_rcv.sb_cc < so->so_rcv.sb_lowat ||
1232: ((flags & MSG_WAITALL) &&
1233: uio->uio_resid <= so->so_rcv.sb_hiwat)) &&
1.146 dyoung 1234: m->m_nextpkt == NULL && !atomic)) {
1.1 cgd 1235: #ifdef DIAGNOSTIC
1.144 dyoung 1236: if (m == NULL && so->so_rcv.sb_cc)
1.1 cgd 1237: panic("receive 1");
1238: #endif
1239: if (so->so_error) {
1.144 dyoung 1240: if (m != NULL)
1.15 mycroft 1241: goto dontblock;
1.1 cgd 1242: error = so->so_error;
1243: if ((flags & MSG_PEEK) == 0)
1244: so->so_error = 0;
1245: goto release;
1246: }
1247: if (so->so_state & SS_CANTRCVMORE) {
1.144 dyoung 1248: if (m != NULL)
1.15 mycroft 1249: goto dontblock;
1.1 cgd 1250: else
1251: goto release;
1252: }
1.144 dyoung 1253: for (; m != NULL; m = m->m_next)
1.1 cgd 1254: if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) {
1255: m = so->so_rcv.sb_mb;
1256: goto dontblock;
1257: }
1258: if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
1259: (so->so_proto->pr_flags & PR_CONNREQUIRED)) {
1260: error = ENOTCONN;
1261: goto release;
1262: }
1263: if (uio->uio_resid == 0)
1264: goto release;
1.206 christos 1265: if ((so->so_state & SS_NBIO) ||
1266: (flags & (MSG_DONTWAIT|MSG_NBIO))) {
1.1 cgd 1267: error = EWOULDBLOCK;
1268: goto release;
1269: }
1.69 thorpej 1270: SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 1");
1271: SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 1");
1.1 cgd 1272: sbunlock(&so->so_rcv);
1.196 dsl 1273: if (wakeup_state & SS_RESTARTSYS)
1274: error = ERESTART;
1275: else
1276: error = sbwait(&so->so_rcv);
1.160 ad 1277: if (error != 0) {
1278: sounlock(so);
1279: splx(s);
1.144 dyoung 1280: return error;
1.160 ad 1281: }
1.196 dsl 1282: wakeup_state = so->so_state;
1.1 cgd 1283: goto restart;
1284: }
1.54 lukem 1285: dontblock:
1.69 thorpej 1286: /*
1287: * On entry here, m points to the first record of the socket buffer.
1.159 ad 1288: * From this point onward, we maintain 'nextrecord' as a cache of the
1289: * pointer to the next record in the socket buffer. We must keep the
1290: * various socket buffer pointers and local stack versions of the
1291: * pointers in sync, pushing out modifications before dropping the
1.160 ad 1292: * socket lock, and re-reading them when picking it up.
1.159 ad 1293: *
1294: * Otherwise, we will race with the network stack appending new data
1295: * or records onto the socket buffer by using inconsistent/stale
1296: * versions of the field, possibly resulting in socket buffer
1297: * corruption.
1298: *
1299: * By holding the high-level sblock(), we prevent simultaneous
1300: * readers from pulling off the front of the socket buffer.
1.69 thorpej 1301: */
1.144 dyoung 1302: if (l != NULL)
1.157 ad 1303: l->l_ru.ru_msgrcv++;
1.69 thorpej 1304: KASSERT(m == so->so_rcv.sb_mb);
1305: SBLASTRECORDCHK(&so->so_rcv, "soreceive 1");
1306: SBLASTMBUFCHK(&so->so_rcv, "soreceive 1");
1.1 cgd 1307: nextrecord = m->m_nextpkt;
1308: if (pr->pr_flags & PR_ADDR) {
1309: #ifdef DIAGNOSTIC
1310: if (m->m_type != MT_SONAME)
1311: panic("receive 1a");
1312: #endif
1.3 andrew 1313: orig_resid = 0;
1.1 cgd 1314: if (flags & MSG_PEEK) {
1315: if (paddr)
1316: *paddr = m_copy(m, 0, m->m_len);
1317: m = m->m_next;
1318: } else {
1319: sbfree(&so->so_rcv, m);
1.67 he 1320: mbuf_removed = 1;
1.144 dyoung 1321: if (paddr != NULL) {
1.1 cgd 1322: *paddr = m;
1323: so->so_rcv.sb_mb = m->m_next;
1.144 dyoung 1324: m->m_next = NULL;
1.1 cgd 1325: m = so->so_rcv.sb_mb;
1326: } else {
1.249 ! christos 1327: m = so->so_rcv.sb_mb = m_free(m);
1.1 cgd 1328: }
1.159 ad 1329: sbsync(&so->so_rcv, nextrecord);
1.1 cgd 1330: }
1331: }
1.247 rjs 1332: if (pr->pr_flags & PR_ADDR_OPT) {
1333: /*
1334: * For SCTP we may be getting a
1335: * whole message OR a partial delivery.
1336: */
1337: if (m->m_type == MT_SONAME) {
1338: orig_resid = 0;
1339: if (flags & MSG_PEEK) {
1340: if (paddr)
1341: *paddr = m_copy(m, 0, m->m_len);
1342: m = m->m_next;
1343: } else {
1344: sbfree(&so->so_rcv, m);
1345: if (paddr) {
1346: *paddr = m;
1347: so->so_rcv.sb_mb = m->m_next;
1348: m->m_next = 0;
1349: m = so->so_rcv.sb_mb;
1350: } else {
1.249 ! christos 1351: m = so->so_rcv.sb_mb = m_free(m);
1.247 rjs 1352: }
1353: }
1354: }
1355: }
1.159 ad 1356:
1357: /*
1358: * Process one or more MT_CONTROL mbufs present before any data mbufs
1359: * in the first mbuf chain on the socket buffer. If MSG_PEEK, we
1360: * just copy the data; if !MSG_PEEK, we call into the protocol to
1361: * perform externalization (or freeing if controlp == NULL).
1362: */
1363: if (__predict_false(m != NULL && m->m_type == MT_CONTROL)) {
1364: struct mbuf *cm = NULL, *cmn;
1365: struct mbuf **cme = &cm;
1366:
1367: do {
1368: if (flags & MSG_PEEK) {
1369: if (controlp != NULL) {
1370: *controlp = m_copy(m, 0, m->m_len);
1371: controlp = &(*controlp)->m_next;
1372: }
1373: m = m->m_next;
1374: } else {
1375: sbfree(&so->so_rcv, m);
1.1 cgd 1376: so->so_rcv.sb_mb = m->m_next;
1.144 dyoung 1377: m->m_next = NULL;
1.159 ad 1378: *cme = m;
1379: cme = &(*cme)->m_next;
1.1 cgd 1380: m = so->so_rcv.sb_mb;
1.159 ad 1381: }
1382: } while (m != NULL && m->m_type == MT_CONTROL);
1383: if ((flags & MSG_PEEK) == 0)
1384: sbsync(&so->so_rcv, nextrecord);
1385: for (; cm != NULL; cm = cmn) {
1386: cmn = cm->m_next;
1387: cm->m_next = NULL;
1388: type = mtod(cm, struct cmsghdr *)->cmsg_type;
1389: if (controlp != NULL) {
1390: if (dom->dom_externalize != NULL &&
1391: type == SCM_RIGHTS) {
1.160 ad 1392: sounlock(so);
1.159 ad 1393: splx(s);
1.204 christos 1394: error = (*dom->dom_externalize)(cm, l,
1395: (flags & MSG_CMSG_CLOEXEC) ?
1396: O_CLOEXEC : 0);
1.159 ad 1397: s = splsoftnet();
1.160 ad 1398: solock(so);
1.159 ad 1399: }
1400: *controlp = cm;
1401: while (*controlp != NULL)
1402: controlp = &(*controlp)->m_next;
1.1 cgd 1403: } else {
1.106 itojun 1404: /*
1405: * Dispose of any SCM_RIGHTS message that went
1406: * through the read path rather than recv.
1407: */
1.159 ad 1408: if (dom->dom_dispose != NULL &&
1409: type == SCM_RIGHTS) {
1.160 ad 1410: sounlock(so);
1.159 ad 1411: (*dom->dom_dispose)(cm);
1.160 ad 1412: solock(so);
1.159 ad 1413: }
1414: m_freem(cm);
1.1 cgd 1415: }
1416: }
1.159 ad 1417: if (m != NULL)
1418: nextrecord = so->so_rcv.sb_mb->m_nextpkt;
1419: else
1420: nextrecord = so->so_rcv.sb_mb;
1421: orig_resid = 0;
1.1 cgd 1422: }
1.69 thorpej 1423:
1.159 ad 1424: /* If m is non-NULL, we have some data to read. */
1425: if (__predict_true(m != NULL)) {
1.1 cgd 1426: type = m->m_type;
1427: if (type == MT_OOBDATA)
1428: flags |= MSG_OOB;
1429: }
1.69 thorpej 1430: SBLASTRECORDCHK(&so->so_rcv, "soreceive 2");
1431: SBLASTMBUFCHK(&so->so_rcv, "soreceive 2");
1432:
1.1 cgd 1433: moff = 0;
1434: offset = 0;
1.144 dyoung 1435: while (m != NULL && uio->uio_resid > 0 && error == 0) {
1.1 cgd 1436: if (m->m_type == MT_OOBDATA) {
1437: if (type != MT_OOBDATA)
1438: break;
1439: } else if (type == MT_OOBDATA)
1440: break;
1441: #ifdef DIAGNOSTIC
1442: else if (m->m_type != MT_DATA && m->m_type != MT_HEADER)
1443: panic("receive 3");
1444: #endif
1445: so->so_state &= ~SS_RCVATMARK;
1.196 dsl 1446: wakeup_state = 0;
1.1 cgd 1447: len = uio->uio_resid;
1448: if (so->so_oobmark && len > so->so_oobmark - offset)
1449: len = so->so_oobmark - offset;
1450: if (len > m->m_len - moff)
1451: len = m->m_len - moff;
1452: /*
1453: * If mp is set, just pass back the mbufs.
1454: * Otherwise copy them out via the uio, then free.
1455: * Sockbuf must be consistent here (points to current mbuf,
1456: * it points to next record) when we drop priority;
1457: * we must note any additions to the sockbuf when we
1458: * block interrupts again.
1459: */
1.144 dyoung 1460: if (mp == NULL) {
1.69 thorpej 1461: SBLASTRECORDCHK(&so->so_rcv, "soreceive uiomove");
1462: SBLASTMBUFCHK(&so->so_rcv, "soreceive uiomove");
1.160 ad 1463: sounlock(so);
1.1 cgd 1464: splx(s);
1.211 chs 1465: error = uiomove(mtod(m, char *) + moff, len, uio);
1.20 mycroft 1466: s = splsoftnet();
1.160 ad 1467: solock(so);
1.144 dyoung 1468: if (error != 0) {
1.67 he 1469: /*
1470: * If any part of the record has been removed
1471: * (such as the MT_SONAME mbuf, which will
1472: * happen when PR_ADDR, and thus also
1473: * PR_ATOMIC, is set), then drop the entire
1474: * record to maintain the atomicity of the
1475: * receive operation.
1476: *
1477: * This avoids a later panic("receive 1a")
1478: * when compiled with DIAGNOSTIC.
1479: */
1.146 dyoung 1480: if (m && mbuf_removed && atomic)
1.67 he 1481: (void) sbdroprecord(&so->so_rcv);
1482:
1.57 jdolecek 1483: goto release;
1.67 he 1484: }
1.1 cgd 1485: } else
1486: uio->uio_resid -= len;
1487: if (len == m->m_len - moff) {
1488: if (m->m_flags & M_EOR)
1489: flags |= MSG_EOR;
1.247 rjs 1490: #ifdef SCTP
1491: if (m->m_flags & M_NOTIFICATION)
1492: flags |= MSG_NOTIFICATION;
1493: #endif /* SCTP */
1.1 cgd 1494: if (flags & MSG_PEEK) {
1495: m = m->m_next;
1496: moff = 0;
1497: } else {
1498: nextrecord = m->m_nextpkt;
1499: sbfree(&so->so_rcv, m);
1500: if (mp) {
1501: *mp = m;
1502: mp = &m->m_next;
1503: so->so_rcv.sb_mb = m = m->m_next;
1.140 dyoung 1504: *mp = NULL;
1.1 cgd 1505: } else {
1.249 ! christos 1506: m = so->so_rcv.sb_mb = m_free(m);
1.1 cgd 1507: }
1.69 thorpej 1508: /*
1509: * If m != NULL, we also know that
1510: * so->so_rcv.sb_mb != NULL.
1511: */
1512: KASSERT(so->so_rcv.sb_mb == m);
1513: if (m) {
1.1 cgd 1514: m->m_nextpkt = nextrecord;
1.69 thorpej 1515: if (nextrecord == NULL)
1516: so->so_rcv.sb_lastrecord = m;
1517: } else {
1518: so->so_rcv.sb_mb = nextrecord;
1.70 thorpej 1519: SB_EMPTY_FIXUP(&so->so_rcv);
1.69 thorpej 1520: }
1521: SBLASTRECORDCHK(&so->so_rcv, "soreceive 3");
1522: SBLASTMBUFCHK(&so->so_rcv, "soreceive 3");
1.1 cgd 1523: }
1.144 dyoung 1524: } else if (flags & MSG_PEEK)
1525: moff += len;
1526: else {
1.160 ad 1527: if (mp != NULL) {
1528: mt = m_copym(m, 0, len, M_NOWAIT);
1529: if (__predict_false(mt == NULL)) {
1530: sounlock(so);
1531: mt = m_copym(m, 0, len, M_WAIT);
1532: solock(so);
1533: }
1534: *mp = mt;
1535: }
1.144 dyoung 1536: m->m_data += len;
1537: m->m_len -= len;
1538: so->so_rcv.sb_cc -= len;
1.1 cgd 1539: }
1540: if (so->so_oobmark) {
1541: if ((flags & MSG_PEEK) == 0) {
1542: so->so_oobmark -= len;
1543: if (so->so_oobmark == 0) {
1544: so->so_state |= SS_RCVATMARK;
1545: break;
1546: }
1.7 cgd 1547: } else {
1.1 cgd 1548: offset += len;
1.7 cgd 1549: if (offset == so->so_oobmark)
1550: break;
1551: }
1.1 cgd 1552: }
1553: if (flags & MSG_EOR)
1554: break;
1555: /*
1556: * If the MSG_WAITALL flag is set (for non-atomic socket),
1557: * we must not quit until "uio->uio_resid == 0" or an error
1558: * termination. If a signal/timeout occurs, return
1559: * with a short count but without error.
1560: * Keep sockbuf locked against other readers.
1561: */
1.144 dyoung 1562: while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 &&
1.3 andrew 1563: !sosendallatonce(so) && !nextrecord) {
1.1 cgd 1564: if (so->so_error || so->so_state & SS_CANTRCVMORE)
1565: break;
1.68 matt 1566: /*
1567: * If we are peeking and the socket receive buffer is
1568: * full, stop since we can't get more data to peek at.
1569: */
1570: if ((flags & MSG_PEEK) && sbspace(&so->so_rcv) <= 0)
1571: break;
1572: /*
1573: * If we've drained the socket buffer, tell the
1574: * protocol in case it needs to do something to
1575: * get it filled again.
1576: */
1577: if ((pr->pr_flags & PR_WANTRCVD) && so->so_pcb)
1.233 rtr 1578: (*pr->pr_usrreqs->pr_rcvd)(so, flags, l);
1.69 thorpej 1579: SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 2");
1580: SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 2");
1.196 dsl 1581: if (wakeup_state & SS_RESTARTSYS)
1582: error = ERESTART;
1583: else
1584: error = sbwait(&so->so_rcv);
1.144 dyoung 1585: if (error != 0) {
1.1 cgd 1586: sbunlock(&so->so_rcv);
1.160 ad 1587: sounlock(so);
1.1 cgd 1588: splx(s);
1.144 dyoung 1589: return 0;
1.1 cgd 1590: }
1.21 christos 1591: if ((m = so->so_rcv.sb_mb) != NULL)
1.1 cgd 1592: nextrecord = m->m_nextpkt;
1.196 dsl 1593: wakeup_state = so->so_state;
1.1 cgd 1594: }
1595: }
1.3 andrew 1596:
1.146 dyoung 1597: if (m && atomic) {
1.3 andrew 1598: flags |= MSG_TRUNC;
1599: if ((flags & MSG_PEEK) == 0)
1600: (void) sbdroprecord(&so->so_rcv);
1601: }
1.1 cgd 1602: if ((flags & MSG_PEEK) == 0) {
1.144 dyoung 1603: if (m == NULL) {
1.69 thorpej 1604: /*
1.70 thorpej 1605: * First part is an inline SB_EMPTY_FIXUP(). Second
1.69 thorpej 1606: * part makes sure sb_lastrecord is up-to-date if
1607: * there is still data in the socket buffer.
1608: */
1.1 cgd 1609: so->so_rcv.sb_mb = nextrecord;
1.69 thorpej 1610: if (so->so_rcv.sb_mb == NULL) {
1611: so->so_rcv.sb_mbtail = NULL;
1612: so->so_rcv.sb_lastrecord = NULL;
1613: } else if (nextrecord->m_nextpkt == NULL)
1614: so->so_rcv.sb_lastrecord = nextrecord;
1615: }
1616: SBLASTRECORDCHK(&so->so_rcv, "soreceive 4");
1617: SBLASTMBUFCHK(&so->so_rcv, "soreceive 4");
1.1 cgd 1618: if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
1.233 rtr 1619: (*pr->pr_usrreqs->pr_rcvd)(so, flags, l);
1.1 cgd 1620: }
1.3 andrew 1621: if (orig_resid == uio->uio_resid && orig_resid &&
1622: (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) {
1623: sbunlock(&so->so_rcv);
1624: goto restart;
1625: }
1.108 perry 1626:
1.144 dyoung 1627: if (flagsp != NULL)
1.1 cgd 1628: *flagsp |= flags;
1.54 lukem 1629: release:
1.1 cgd 1630: sbunlock(&so->so_rcv);
1.160 ad 1631: sounlock(so);
1.1 cgd 1632: splx(s);
1.144 dyoung 1633: return error;
1.1 cgd 1634: }
1635:
1.14 mycroft 1636: int
1.54 lukem 1637: soshutdown(struct socket *so, int how)
1.1 cgd 1638: {
1.99 matt 1639: const struct protosw *pr;
1.160 ad 1640: int error;
1641:
1642: KASSERT(solocked(so));
1.34 kleink 1643:
1.54 lukem 1644: pr = so->so_proto;
1.34 kleink 1645: if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR))
1646: return (EINVAL);
1.1 cgd 1647:
1.160 ad 1648: if (how == SHUT_RD || how == SHUT_RDWR) {
1.1 cgd 1649: sorflush(so);
1.160 ad 1650: error = 0;
1651: }
1.34 kleink 1652: if (how == SHUT_WR || how == SHUT_RDWR)
1.229 rtr 1653: error = (*pr->pr_usrreqs->pr_shutdown)(so);
1.160 ad 1654:
1655: return error;
1.1 cgd 1656: }
1657:
1.195 dsl 1658: void
1.196 dsl 1659: sorestart(struct socket *so)
1.188 ad 1660: {
1.196 dsl 1661: /*
1662: * An application has called close() on an fd on which another
1663: * of its threads has called a socket system call.
1664: * Mark this and wake everyone up, and code that would block again
1665: * instead returns ERESTART.
1666: * On system call re-entry the fd is validated and EBADF returned.
1667: * Any other fd will block again on the 2nd syscall.
1668: */
1.188 ad 1669: solock(so);
1.196 dsl 1670: so->so_state |= SS_RESTARTSYS;
1.188 ad 1671: cv_broadcast(&so->so_cv);
1.196 dsl 1672: cv_broadcast(&so->so_snd.sb_cv);
1673: cv_broadcast(&so->so_rcv.sb_cv);
1.188 ad 1674: sounlock(so);
1675: }
1676:
1.14 mycroft 1677: void
1.54 lukem 1678: sorflush(struct socket *so)
1.1 cgd 1679: {
1.54 lukem 1680: struct sockbuf *sb, asb;
1.99 matt 1681: const struct protosw *pr;
1.160 ad 1682:
1683: KASSERT(solocked(so));
1.1 cgd 1684:
1.54 lukem 1685: sb = &so->so_rcv;
1686: pr = so->so_proto;
1.160 ad 1687: socantrcvmore(so);
1.1 cgd 1688: sb->sb_flags |= SB_NOINTR;
1.160 ad 1689: (void )sblock(sb, M_WAITOK);
1.1 cgd 1690: sbunlock(sb);
1691: asb = *sb;
1.86 wrstuden 1692: /*
1693: * Clear most of the sockbuf structure, but leave some of the
1694: * fields valid.
1695: */
1696: memset(&sb->sb_startzero, 0,
1697: sizeof(*sb) - offsetof(struct sockbuf, sb_startzero));
1.160 ad 1698: if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose) {
1699: sounlock(so);
1.1 cgd 1700: (*pr->pr_domain->dom_dispose)(asb.sb_mb);
1.160 ad 1701: solock(so);
1702: }
1.98 christos 1703: sbrelease(&asb, so);
1.1 cgd 1704: }
1705:
1.171 plunky 1706: /*
1707: * internal set SOL_SOCKET options
1708: */
1.142 dyoung 1709: static int
1.171 plunky 1710: sosetopt1(struct socket *so, const struct sockopt *sopt)
1.1 cgd 1711: {
1.219 christos 1712: int error = EINVAL, opt;
1713: int optval = 0; /* XXX: gcc */
1.171 plunky 1714: struct linger l;
1715: struct timeval tv;
1.142 dyoung 1716:
1.179 christos 1717: switch ((opt = sopt->sopt_name)) {
1.142 dyoung 1718:
1.170 tls 1719: case SO_ACCEPTFILTER:
1.177 ad 1720: error = accept_filt_setopt(so, sopt);
1721: KASSERT(solocked(so));
1.170 tls 1722: break;
1723:
1.171 plunky 1724: case SO_LINGER:
1725: error = sockopt_get(sopt, &l, sizeof(l));
1.177 ad 1726: solock(so);
1.171 plunky 1727: if (error)
1.177 ad 1728: break;
1.171 plunky 1729: if (l.l_linger < 0 || l.l_linger > USHRT_MAX ||
1.177 ad 1730: l.l_linger > (INT_MAX / hz)) {
1731: error = EDOM;
1732: break;
1733: }
1.171 plunky 1734: so->so_linger = l.l_linger;
1735: if (l.l_onoff)
1736: so->so_options |= SO_LINGER;
1737: else
1738: so->so_options &= ~SO_LINGER;
1.177 ad 1739: break;
1.1 cgd 1740:
1.142 dyoung 1741: case SO_DEBUG:
1742: case SO_KEEPALIVE:
1743: case SO_DONTROUTE:
1744: case SO_USELOOPBACK:
1745: case SO_BROADCAST:
1746: case SO_REUSEADDR:
1747: case SO_REUSEPORT:
1748: case SO_OOBINLINE:
1749: case SO_TIMESTAMP:
1.207 christos 1750: case SO_NOSIGPIPE:
1.184 christos 1751: #ifdef SO_OTIMESTAMP
1752: case SO_OTIMESTAMP:
1753: #endif
1.171 plunky 1754: error = sockopt_getint(sopt, &optval);
1.177 ad 1755: solock(so);
1.171 plunky 1756: if (error)
1.177 ad 1757: break;
1.171 plunky 1758: if (optval)
1.179 christos 1759: so->so_options |= opt;
1.142 dyoung 1760: else
1.179 christos 1761: so->so_options &= ~opt;
1.142 dyoung 1762: break;
1763:
1764: case SO_SNDBUF:
1765: case SO_RCVBUF:
1766: case SO_SNDLOWAT:
1767: case SO_RCVLOWAT:
1.171 plunky 1768: error = sockopt_getint(sopt, &optval);
1.177 ad 1769: solock(so);
1.171 plunky 1770: if (error)
1.177 ad 1771: break;
1.1 cgd 1772:
1.142 dyoung 1773: /*
1774: * Values < 1 make no sense for any of these
1775: * options, so disallow them.
1776: */
1.177 ad 1777: if (optval < 1) {
1778: error = EINVAL;
1779: break;
1780: }
1.1 cgd 1781:
1.179 christos 1782: switch (opt) {
1.171 plunky 1783: case SO_SNDBUF:
1.177 ad 1784: if (sbreserve(&so->so_snd, (u_long)optval, so) == 0) {
1785: error = ENOBUFS;
1786: break;
1787: }
1.171 plunky 1788: so->so_snd.sb_flags &= ~SB_AUTOSIZE;
1789: break;
1.1 cgd 1790:
1791: case SO_RCVBUF:
1.177 ad 1792: if (sbreserve(&so->so_rcv, (u_long)optval, so) == 0) {
1793: error = ENOBUFS;
1794: break;
1795: }
1.171 plunky 1796: so->so_rcv.sb_flags &= ~SB_AUTOSIZE;
1.142 dyoung 1797: break;
1798:
1799: /*
1800: * Make sure the low-water is never greater than
1801: * the high-water.
1802: */
1.1 cgd 1803: case SO_SNDLOWAT:
1.171 plunky 1804: if (optval > so->so_snd.sb_hiwat)
1805: optval = so->so_snd.sb_hiwat;
1806:
1807: so->so_snd.sb_lowat = optval;
1.142 dyoung 1808: break;
1.171 plunky 1809:
1.1 cgd 1810: case SO_RCVLOWAT:
1.171 plunky 1811: if (optval > so->so_rcv.sb_hiwat)
1812: optval = so->so_rcv.sb_hiwat;
1813:
1814: so->so_rcv.sb_lowat = optval;
1.142 dyoung 1815: break;
1816: }
1817: break;
1.28 thorpej 1818:
1.179 christos 1819: #ifdef COMPAT_50
1820: case SO_OSNDTIMEO:
1821: case SO_ORCVTIMEO: {
1822: struct timeval50 otv;
1823: error = sockopt_get(sopt, &otv, sizeof(otv));
1.186 pooka 1824: if (error) {
1825: solock(so);
1.183 christos 1826: break;
1.186 pooka 1827: }
1.179 christos 1828: timeval50_to_timeval(&otv, &tv);
1829: opt = opt == SO_OSNDTIMEO ? SO_SNDTIMEO : SO_RCVTIMEO;
1.182 christos 1830: error = 0;
1.179 christos 1831: /*FALLTHROUGH*/
1832: }
1833: #endif /* COMPAT_50 */
1834:
1.142 dyoung 1835: case SO_SNDTIMEO:
1836: case SO_RCVTIMEO:
1.182 christos 1837: if (error)
1.179 christos 1838: error = sockopt_get(sopt, &tv, sizeof(tv));
1.177 ad 1839: solock(so);
1.171 plunky 1840: if (error)
1.177 ad 1841: break;
1.171 plunky 1842:
1.177 ad 1843: if (tv.tv_sec > (INT_MAX - tv.tv_usec / tick) / hz) {
1844: error = EDOM;
1845: break;
1846: }
1.28 thorpej 1847:
1.171 plunky 1848: optval = tv.tv_sec * hz + tv.tv_usec / tick;
1849: if (optval == 0 && tv.tv_usec != 0)
1850: optval = 1;
1.28 thorpej 1851:
1.179 christos 1852: switch (opt) {
1.142 dyoung 1853: case SO_SNDTIMEO:
1.171 plunky 1854: so->so_snd.sb_timeo = optval;
1.1 cgd 1855: break;
1856: case SO_RCVTIMEO:
1.171 plunky 1857: so->so_rcv.sb_timeo = optval;
1.142 dyoung 1858: break;
1859: }
1860: break;
1.1 cgd 1861:
1.142 dyoung 1862: default:
1.177 ad 1863: solock(so);
1864: error = ENOPROTOOPT;
1865: break;
1.142 dyoung 1866: }
1.177 ad 1867: KASSERT(solocked(so));
1868: return error;
1.142 dyoung 1869: }
1.1 cgd 1870:
1.142 dyoung 1871: int
1.171 plunky 1872: sosetopt(struct socket *so, struct sockopt *sopt)
1.142 dyoung 1873: {
1874: int error, prerr;
1.1 cgd 1875:
1.177 ad 1876: if (sopt->sopt_level == SOL_SOCKET) {
1.171 plunky 1877: error = sosetopt1(so, sopt);
1.177 ad 1878: KASSERT(solocked(so));
1879: } else {
1.142 dyoung 1880: error = ENOPROTOOPT;
1.177 ad 1881: solock(so);
1882: }
1.1 cgd 1883:
1.142 dyoung 1884: if ((error == 0 || error == ENOPROTOOPT) &&
1885: so->so_proto != NULL && so->so_proto->pr_ctloutput != NULL) {
1886: /* give the protocol stack a shot */
1.171 plunky 1887: prerr = (*so->so_proto->pr_ctloutput)(PRCO_SETOPT, so, sopt);
1.142 dyoung 1888: if (prerr == 0)
1889: error = 0;
1890: else if (prerr != ENOPROTOOPT)
1891: error = prerr;
1.171 plunky 1892: }
1.160 ad 1893: sounlock(so);
1.142 dyoung 1894: return error;
1.1 cgd 1895: }
1896:
1.171 plunky 1897: /*
1898: * so_setsockopt() is a wrapper providing a sockopt structure for sosetopt()
1899: */
1900: int
1901: so_setsockopt(struct lwp *l, struct socket *so, int level, int name,
1902: const void *val, size_t valsize)
1903: {
1904: struct sockopt sopt;
1905: int error;
1906:
1907: KASSERT(valsize == 0 || val != NULL);
1908:
1909: sockopt_init(&sopt, level, name, valsize);
1910: sockopt_set(&sopt, val, valsize);
1911:
1912: error = sosetopt(so, &sopt);
1913:
1914: sockopt_destroy(&sopt);
1915:
1916: return error;
1917: }
1918:
1919: /*
1920: * internal get SOL_SOCKET options
1921: */
1922: static int
1923: sogetopt1(struct socket *so, struct sockopt *sopt)
1924: {
1.179 christos 1925: int error, optval, opt;
1.171 plunky 1926: struct linger l;
1927: struct timeval tv;
1928:
1.179 christos 1929: switch ((opt = sopt->sopt_name)) {
1.171 plunky 1930:
1931: case SO_ACCEPTFILTER:
1.177 ad 1932: error = accept_filt_getopt(so, sopt);
1.171 plunky 1933: break;
1934:
1935: case SO_LINGER:
1936: l.l_onoff = (so->so_options & SO_LINGER) ? 1 : 0;
1937: l.l_linger = so->so_linger;
1938:
1939: error = sockopt_set(sopt, &l, sizeof(l));
1940: break;
1941:
1942: case SO_USELOOPBACK:
1943: case SO_DONTROUTE:
1944: case SO_DEBUG:
1945: case SO_KEEPALIVE:
1946: case SO_REUSEADDR:
1947: case SO_REUSEPORT:
1948: case SO_BROADCAST:
1949: case SO_OOBINLINE:
1950: case SO_TIMESTAMP:
1.207 christos 1951: case SO_NOSIGPIPE:
1.184 christos 1952: #ifdef SO_OTIMESTAMP
1953: case SO_OTIMESTAMP:
1954: #endif
1.218 seanb 1955: case SO_ACCEPTCONN:
1.179 christos 1956: error = sockopt_setint(sopt, (so->so_options & opt) ? 1 : 0);
1.171 plunky 1957: break;
1958:
1959: case SO_TYPE:
1960: error = sockopt_setint(sopt, so->so_type);
1961: break;
1962:
1963: case SO_ERROR:
1964: error = sockopt_setint(sopt, so->so_error);
1965: so->so_error = 0;
1966: break;
1967:
1968: case SO_SNDBUF:
1969: error = sockopt_setint(sopt, so->so_snd.sb_hiwat);
1970: break;
1971:
1972: case SO_RCVBUF:
1973: error = sockopt_setint(sopt, so->so_rcv.sb_hiwat);
1974: break;
1975:
1976: case SO_SNDLOWAT:
1977: error = sockopt_setint(sopt, so->so_snd.sb_lowat);
1978: break;
1979:
1980: case SO_RCVLOWAT:
1981: error = sockopt_setint(sopt, so->so_rcv.sb_lowat);
1982: break;
1983:
1.179 christos 1984: #ifdef COMPAT_50
1985: case SO_OSNDTIMEO:
1986: case SO_ORCVTIMEO: {
1987: struct timeval50 otv;
1988:
1989: optval = (opt == SO_OSNDTIMEO ?
1990: so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
1991:
1992: otv.tv_sec = optval / hz;
1993: otv.tv_usec = (optval % hz) * tick;
1994:
1995: error = sockopt_set(sopt, &otv, sizeof(otv));
1996: break;
1997: }
1998: #endif /* COMPAT_50 */
1999:
1.171 plunky 2000: case SO_SNDTIMEO:
2001: case SO_RCVTIMEO:
1.179 christos 2002: optval = (opt == SO_SNDTIMEO ?
1.171 plunky 2003: so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
2004:
2005: tv.tv_sec = optval / hz;
2006: tv.tv_usec = (optval % hz) * tick;
2007:
2008: error = sockopt_set(sopt, &tv, sizeof(tv));
2009: break;
2010:
2011: case SO_OVERFLOWED:
2012: error = sockopt_setint(sopt, so->so_rcv.sb_overflowed);
2013: break;
2014:
2015: default:
2016: error = ENOPROTOOPT;
2017: break;
2018: }
2019:
2020: return (error);
2021: }
2022:
1.14 mycroft 2023: int
1.171 plunky 2024: sogetopt(struct socket *so, struct sockopt *sopt)
1.1 cgd 2025: {
1.160 ad 2026: int error;
1.1 cgd 2027:
1.160 ad 2028: solock(so);
1.171 plunky 2029: if (sopt->sopt_level != SOL_SOCKET) {
1.1 cgd 2030: if (so->so_proto && so->so_proto->pr_ctloutput) {
1.160 ad 2031: error = ((*so->so_proto->pr_ctloutput)
1.171 plunky 2032: (PRCO_GETOPT, so, sopt));
1.1 cgd 2033: } else
1.160 ad 2034: error = (ENOPROTOOPT);
1.1 cgd 2035: } else {
1.171 plunky 2036: error = sogetopt1(so, sopt);
2037: }
2038: sounlock(so);
2039: return (error);
2040: }
2041:
2042: /*
2043: * alloc sockopt data buffer buffer
2044: * - will be released at destroy
2045: */
1.176 plunky 2046: static int
2047: sockopt_alloc(struct sockopt *sopt, size_t len, km_flag_t kmflag)
1.171 plunky 2048: {
2049:
2050: KASSERT(sopt->sopt_size == 0);
2051:
1.176 plunky 2052: if (len > sizeof(sopt->sopt_buf)) {
2053: sopt->sopt_data = kmem_zalloc(len, kmflag);
2054: if (sopt->sopt_data == NULL)
2055: return ENOMEM;
2056: } else
1.171 plunky 2057: sopt->sopt_data = sopt->sopt_buf;
2058:
2059: sopt->sopt_size = len;
1.176 plunky 2060: return 0;
1.171 plunky 2061: }
2062:
2063: /*
2064: * initialise sockopt storage
1.176 plunky 2065: * - MAY sleep during allocation
1.171 plunky 2066: */
2067: void
2068: sockopt_init(struct sockopt *sopt, int level, int name, size_t size)
2069: {
1.1 cgd 2070:
1.171 plunky 2071: memset(sopt, 0, sizeof(*sopt));
1.1 cgd 2072:
1.171 plunky 2073: sopt->sopt_level = level;
2074: sopt->sopt_name = name;
1.176 plunky 2075: (void)sockopt_alloc(sopt, size, KM_SLEEP);
1.171 plunky 2076: }
2077:
2078: /*
2079: * destroy sockopt storage
2080: * - will release any held memory references
2081: */
2082: void
2083: sockopt_destroy(struct sockopt *sopt)
2084: {
2085:
2086: if (sopt->sopt_data != sopt->sopt_buf)
1.173 plunky 2087: kmem_free(sopt->sopt_data, sopt->sopt_size);
1.171 plunky 2088:
2089: memset(sopt, 0, sizeof(*sopt));
2090: }
2091:
2092: /*
2093: * set sockopt value
2094: * - value is copied into sockopt
1.176 plunky 2095: * - memory is allocated when necessary, will not sleep
1.171 plunky 2096: */
2097: int
2098: sockopt_set(struct sockopt *sopt, const void *buf, size_t len)
2099: {
1.176 plunky 2100: int error;
1.171 plunky 2101:
1.176 plunky 2102: if (sopt->sopt_size == 0) {
2103: error = sockopt_alloc(sopt, len, KM_NOSLEEP);
2104: if (error)
2105: return error;
2106: }
1.171 plunky 2107:
2108: KASSERT(sopt->sopt_size == len);
2109: memcpy(sopt->sopt_data, buf, len);
2110: return 0;
2111: }
2112:
2113: /*
2114: * common case of set sockopt integer value
2115: */
2116: int
2117: sockopt_setint(struct sockopt *sopt, int val)
2118: {
2119:
2120: return sockopt_set(sopt, &val, sizeof(int));
2121: }
2122:
2123: /*
2124: * get sockopt value
2125: * - correct size must be given
2126: */
2127: int
2128: sockopt_get(const struct sockopt *sopt, void *buf, size_t len)
2129: {
1.170 tls 2130:
1.171 plunky 2131: if (sopt->sopt_size != len)
2132: return EINVAL;
1.1 cgd 2133:
1.171 plunky 2134: memcpy(buf, sopt->sopt_data, len);
2135: return 0;
2136: }
1.1 cgd 2137:
1.171 plunky 2138: /*
2139: * common case of get sockopt integer value
2140: */
2141: int
2142: sockopt_getint(const struct sockopt *sopt, int *valp)
2143: {
1.1 cgd 2144:
1.171 plunky 2145: return sockopt_get(sopt, valp, sizeof(int));
2146: }
1.1 cgd 2147:
1.171 plunky 2148: /*
2149: * set sockopt value from mbuf
2150: * - ONLY for legacy code
2151: * - mbuf is released by sockopt
1.176 plunky 2152: * - will not sleep
1.171 plunky 2153: */
2154: int
2155: sockopt_setmbuf(struct sockopt *sopt, struct mbuf *m)
2156: {
2157: size_t len;
1.176 plunky 2158: int error;
1.1 cgd 2159:
1.171 plunky 2160: len = m_length(m);
1.1 cgd 2161:
1.176 plunky 2162: if (sopt->sopt_size == 0) {
2163: error = sockopt_alloc(sopt, len, KM_NOSLEEP);
2164: if (error)
2165: return error;
2166: }
1.1 cgd 2167:
1.171 plunky 2168: KASSERT(sopt->sopt_size == len);
2169: m_copydata(m, 0, len, sopt->sopt_data);
2170: m_freem(m);
1.1 cgd 2171:
1.171 plunky 2172: return 0;
2173: }
1.1 cgd 2174:
1.171 plunky 2175: /*
2176: * get sockopt value into mbuf
2177: * - ONLY for legacy code
2178: * - mbuf to be released by the caller
1.176 plunky 2179: * - will not sleep
1.171 plunky 2180: */
2181: struct mbuf *
2182: sockopt_getmbuf(const struct sockopt *sopt)
2183: {
2184: struct mbuf *m;
1.107 darrenr 2185:
1.176 plunky 2186: if (sopt->sopt_size > MCLBYTES)
2187: return NULL;
2188:
2189: m = m_get(M_DONTWAIT, MT_SOOPTS);
1.171 plunky 2190: if (m == NULL)
2191: return NULL;
2192:
1.176 plunky 2193: if (sopt->sopt_size > MLEN) {
2194: MCLGET(m, M_DONTWAIT);
2195: if ((m->m_flags & M_EXT) == 0) {
2196: m_free(m);
2197: return NULL;
2198: }
1.1 cgd 2199: }
1.176 plunky 2200:
2201: memcpy(mtod(m, void *), sopt->sopt_data, sopt->sopt_size);
2202: m->m_len = sopt->sopt_size;
1.160 ad 2203:
1.171 plunky 2204: return m;
1.1 cgd 2205: }
2206:
1.14 mycroft 2207: void
1.54 lukem 2208: sohasoutofband(struct socket *so)
1.1 cgd 2209: {
1.153 rmind 2210:
1.90 christos 2211: fownsignal(so->so_pgid, SIGURG, POLL_PRI, POLLPRI|POLLRDBAND, so);
1.189 ad 2212: selnotify(&so->so_rcv.sb_sel, POLLPRI | POLLRDBAND, NOTE_SUBMIT);
1.1 cgd 2213: }
1.72 jdolecek 2214:
2215: static void
2216: filt_sordetach(struct knote *kn)
2217: {
2218: struct socket *so;
2219:
1.235 matt 2220: so = ((file_t *)kn->kn_obj)->f_socket;
1.160 ad 2221: solock(so);
1.73 christos 2222: SLIST_REMOVE(&so->so_rcv.sb_sel.sel_klist, kn, knote, kn_selnext);
2223: if (SLIST_EMPTY(&so->so_rcv.sb_sel.sel_klist))
1.72 jdolecek 2224: so->so_rcv.sb_flags &= ~SB_KNOTE;
1.160 ad 2225: sounlock(so);
1.72 jdolecek 2226: }
2227:
2228: /*ARGSUSED*/
2229: static int
1.129 yamt 2230: filt_soread(struct knote *kn, long hint)
1.72 jdolecek 2231: {
2232: struct socket *so;
1.160 ad 2233: int rv;
1.72 jdolecek 2234:
1.235 matt 2235: so = ((file_t *)kn->kn_obj)->f_socket;
1.160 ad 2236: if (hint != NOTE_SUBMIT)
2237: solock(so);
1.72 jdolecek 2238: kn->kn_data = so->so_rcv.sb_cc;
2239: if (so->so_state & SS_CANTRCVMORE) {
1.108 perry 2240: kn->kn_flags |= EV_EOF;
1.72 jdolecek 2241: kn->kn_fflags = so->so_error;
1.160 ad 2242: rv = 1;
2243: } else if (so->so_error) /* temporary udp error */
2244: rv = 1;
2245: else if (kn->kn_sfflags & NOTE_LOWAT)
2246: rv = (kn->kn_data >= kn->kn_sdata);
2247: else
2248: rv = (kn->kn_data >= so->so_rcv.sb_lowat);
2249: if (hint != NOTE_SUBMIT)
2250: sounlock(so);
2251: return rv;
1.72 jdolecek 2252: }
2253:
2254: static void
2255: filt_sowdetach(struct knote *kn)
2256: {
2257: struct socket *so;
2258:
1.235 matt 2259: so = ((file_t *)kn->kn_obj)->f_socket;
1.160 ad 2260: solock(so);
1.73 christos 2261: SLIST_REMOVE(&so->so_snd.sb_sel.sel_klist, kn, knote, kn_selnext);
2262: if (SLIST_EMPTY(&so->so_snd.sb_sel.sel_klist))
1.72 jdolecek 2263: so->so_snd.sb_flags &= ~SB_KNOTE;
1.160 ad 2264: sounlock(so);
1.72 jdolecek 2265: }
2266:
2267: /*ARGSUSED*/
2268: static int
1.129 yamt 2269: filt_sowrite(struct knote *kn, long hint)
1.72 jdolecek 2270: {
2271: struct socket *so;
1.160 ad 2272: int rv;
1.72 jdolecek 2273:
1.235 matt 2274: so = ((file_t *)kn->kn_obj)->f_socket;
1.160 ad 2275: if (hint != NOTE_SUBMIT)
2276: solock(so);
1.72 jdolecek 2277: kn->kn_data = sbspace(&so->so_snd);
2278: if (so->so_state & SS_CANTSENDMORE) {
1.108 perry 2279: kn->kn_flags |= EV_EOF;
1.72 jdolecek 2280: kn->kn_fflags = so->so_error;
1.160 ad 2281: rv = 1;
2282: } else if (so->so_error) /* temporary udp error */
2283: rv = 1;
2284: else if (((so->so_state & SS_ISCONNECTED) == 0) &&
1.72 jdolecek 2285: (so->so_proto->pr_flags & PR_CONNREQUIRED))
1.160 ad 2286: rv = 0;
2287: else if (kn->kn_sfflags & NOTE_LOWAT)
2288: rv = (kn->kn_data >= kn->kn_sdata);
2289: else
2290: rv = (kn->kn_data >= so->so_snd.sb_lowat);
2291: if (hint != NOTE_SUBMIT)
2292: sounlock(so);
2293: return rv;
1.72 jdolecek 2294: }
2295:
2296: /*ARGSUSED*/
2297: static int
1.129 yamt 2298: filt_solisten(struct knote *kn, long hint)
1.72 jdolecek 2299: {
2300: struct socket *so;
1.160 ad 2301: int rv;
1.72 jdolecek 2302:
1.235 matt 2303: so = ((file_t *)kn->kn_obj)->f_socket;
1.72 jdolecek 2304:
2305: /*
2306: * Set kn_data to number of incoming connections, not
2307: * counting partial (incomplete) connections.
1.108 perry 2308: */
1.160 ad 2309: if (hint != NOTE_SUBMIT)
2310: solock(so);
1.72 jdolecek 2311: kn->kn_data = so->so_qlen;
1.160 ad 2312: rv = (kn->kn_data > 0);
2313: if (hint != NOTE_SUBMIT)
2314: sounlock(so);
2315: return rv;
1.72 jdolecek 2316: }
2317:
2318: static const struct filterops solisten_filtops =
2319: { 1, NULL, filt_sordetach, filt_solisten };
2320: static const struct filterops soread_filtops =
2321: { 1, NULL, filt_sordetach, filt_soread };
2322: static const struct filterops sowrite_filtops =
2323: { 1, NULL, filt_sowdetach, filt_sowrite };
2324:
2325: int
1.129 yamt 2326: soo_kqfilter(struct file *fp, struct knote *kn)
1.72 jdolecek 2327: {
2328: struct socket *so;
2329: struct sockbuf *sb;
2330:
1.235 matt 2331: so = ((file_t *)kn->kn_obj)->f_socket;
1.160 ad 2332: solock(so);
1.72 jdolecek 2333: switch (kn->kn_filter) {
2334: case EVFILT_READ:
2335: if (so->so_options & SO_ACCEPTCONN)
2336: kn->kn_fop = &solisten_filtops;
2337: else
2338: kn->kn_fop = &soread_filtops;
2339: sb = &so->so_rcv;
2340: break;
2341: case EVFILT_WRITE:
2342: kn->kn_fop = &sowrite_filtops;
2343: sb = &so->so_snd;
2344: break;
2345: default:
1.160 ad 2346: sounlock(so);
1.149 pooka 2347: return (EINVAL);
1.72 jdolecek 2348: }
1.73 christos 2349: SLIST_INSERT_HEAD(&sb->sb_sel.sel_klist, kn, kn_selnext);
1.72 jdolecek 2350: sb->sb_flags |= SB_KNOTE;
1.160 ad 2351: sounlock(so);
1.72 jdolecek 2352: return (0);
2353: }
2354:
1.154 ad 2355: static int
2356: sodopoll(struct socket *so, int events)
2357: {
2358: int revents;
2359:
2360: revents = 0;
2361:
2362: if (events & (POLLIN | POLLRDNORM))
2363: if (soreadable(so))
2364: revents |= events & (POLLIN | POLLRDNORM);
2365:
2366: if (events & (POLLOUT | POLLWRNORM))
2367: if (sowritable(so))
2368: revents |= events & (POLLOUT | POLLWRNORM);
2369:
2370: if (events & (POLLPRI | POLLRDBAND))
2371: if (so->so_oobmark || (so->so_state & SS_RCVATMARK))
2372: revents |= events & (POLLPRI | POLLRDBAND);
2373:
2374: return revents;
2375: }
2376:
2377: int
2378: sopoll(struct socket *so, int events)
2379: {
2380: int revents = 0;
2381:
1.160 ad 2382: #ifndef DIAGNOSTIC
2383: /*
2384: * Do a quick, unlocked check in expectation that the socket
2385: * will be ready for I/O. Don't do this check if DIAGNOSTIC,
2386: * as the solocked() assertions will fail.
2387: */
1.154 ad 2388: if ((revents = sodopoll(so, events)) != 0)
2389: return revents;
1.160 ad 2390: #endif
1.154 ad 2391:
1.160 ad 2392: solock(so);
1.154 ad 2393: if ((revents = sodopoll(so, events)) == 0) {
2394: if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
2395: selrecord(curlwp, &so->so_rcv.sb_sel);
1.160 ad 2396: so->so_rcv.sb_flags |= SB_NOTIFY;
1.154 ad 2397: }
2398:
2399: if (events & (POLLOUT | POLLWRNORM)) {
2400: selrecord(curlwp, &so->so_snd.sb_sel);
1.160 ad 2401: so->so_snd.sb_flags |= SB_NOTIFY;
1.154 ad 2402: }
2403: }
1.160 ad 2404: sounlock(so);
1.154 ad 2405:
2406: return revents;
2407: }
2408:
2409:
1.94 yamt 2410: #include <sys/sysctl.h>
2411:
2412: static int sysctl_kern_somaxkva(SYSCTLFN_PROTO);
1.212 pooka 2413: static int sysctl_kern_sbmax(SYSCTLFN_PROTO);
1.94 yamt 2414:
2415: /*
2416: * sysctl helper routine for kern.somaxkva. ensures that the given
2417: * value is not too small.
2418: * (XXX should we maybe make sure it's not too large as well?)
2419: */
2420: static int
2421: sysctl_kern_somaxkva(SYSCTLFN_ARGS)
2422: {
2423: int error, new_somaxkva;
2424: struct sysctlnode node;
2425:
2426: new_somaxkva = somaxkva;
2427: node = *rnode;
2428: node.sysctl_data = &new_somaxkva;
2429: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2430: if (error || newp == NULL)
2431: return (error);
2432:
2433: if (new_somaxkva < (16 * 1024 * 1024)) /* sanity */
2434: return (EINVAL);
2435:
1.136 ad 2436: mutex_enter(&so_pendfree_lock);
1.94 yamt 2437: somaxkva = new_somaxkva;
1.136 ad 2438: cv_broadcast(&socurkva_cv);
2439: mutex_exit(&so_pendfree_lock);
1.94 yamt 2440:
2441: return (error);
2442: }
2443:
1.212 pooka 2444: /*
2445: * sysctl helper routine for kern.sbmax. Basically just ensures that
2446: * any new value is not too small.
2447: */
2448: static int
2449: sysctl_kern_sbmax(SYSCTLFN_ARGS)
2450: {
2451: int error, new_sbmax;
2452: struct sysctlnode node;
2453:
2454: new_sbmax = sb_max;
2455: node = *rnode;
2456: node.sysctl_data = &new_sbmax;
2457: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2458: if (error || newp == NULL)
2459: return (error);
2460:
2461: KERNEL_LOCK(1, NULL);
2462: error = sb_max_set(new_sbmax);
2463: KERNEL_UNLOCK_ONE(NULL);
2464:
2465: return (error);
2466: }
2467:
1.178 pooka 2468: static void
1.212 pooka 2469: sysctl_kern_socket_setup(void)
1.94 yamt 2470: {
2471:
1.178 pooka 2472: KASSERT(socket_sysctllog == NULL);
1.97 atatat 2473:
1.178 pooka 2474: sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
1.97 atatat 2475: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.103 atatat 2476: CTLTYPE_INT, "somaxkva",
2477: SYSCTL_DESCR("Maximum amount of kernel memory to be "
2478: "used for socket buffers"),
1.94 yamt 2479: sysctl_kern_somaxkva, 0, NULL, 0,
2480: CTL_KERN, KERN_SOMAXKVA, CTL_EOL);
1.212 pooka 2481:
2482: sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
2483: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2484: CTLTYPE_INT, "sbmax",
2485: SYSCTL_DESCR("Maximum socket buffer size"),
2486: sysctl_kern_sbmax, 0, NULL, 0,
2487: CTL_KERN, KERN_SBMAX, CTL_EOL);
1.94 yamt 2488: }
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