Annotation of src/sys/kern/uipc_socket.c, Revision 1.255.2.4
1.255.2.4! martin 1: /* $NetBSD: uipc_socket.c,v 1.255.2.3 2018/06/09 15:16:30 martin 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>
1.255.2.4! martin 74: __KERNEL_RCSID(0, "$NetBSD: uipc_socket.c,v 1.255.2.3 2018/06/09 15:16:30 martin 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;
1.253 ryo 298: KASSERT((~m->m_flags & (M_EXT|M_EXT_PAGES)) ==
299: 0);
1.205 bouyer 300: KASSERT(m->m_ext.ext_refcnt == 0);
301:
302: rv += m->m_ext.ext_size;
303: sodoloanfree(m->m_ext.ext_pgs, m->m_ext.ext_buf,
304: m->m_ext.ext_size);
305: pool_cache_put(mb_cache, m);
306: }
1.93 yamt 307:
1.205 bouyer 308: mutex_enter(&so_pendfree_lock);
1.93 yamt 309: }
1.205 bouyer 310: if (rv)
311: cv_broadcast(&socurkva_cv);
312: cv_wait(&pendfree_thread_cv, &so_pendfree_lock);
1.64 thorpej 313: }
1.205 bouyer 314: panic("sopendfree_thread");
315: /* NOTREACHED */
1.64 thorpej 316: }
317:
1.80 yamt 318: void
1.134 christos 319: soloanfree(struct mbuf *m, void *buf, size_t size, void *arg)
1.64 thorpej 320: {
321:
1.156 yamt 322: KASSERT(m != NULL);
1.64 thorpej 323:
1.93 yamt 324: /*
325: * postpone freeing mbuf.
326: *
327: * we can't do it in interrupt context
328: * because we need to put kva back to kernel_map.
329: */
330:
1.136 ad 331: mutex_enter(&so_pendfree_lock);
1.92 yamt 332: m->m_next = so_pendfree;
333: so_pendfree = m;
1.205 bouyer 334: cv_signal(&pendfree_thread_cv);
1.136 ad 335: mutex_exit(&so_pendfree_lock);
1.64 thorpej 336: }
337:
338: static long
339: sosend_loan(struct socket *so, struct uio *uio, struct mbuf *m, long space)
340: {
341: struct iovec *iov = uio->uio_iov;
342: vaddr_t sva, eva;
343: vsize_t len;
1.156 yamt 344: vaddr_t lva;
345: int npgs, error;
346: vaddr_t va;
347: int i;
1.64 thorpej 348:
1.116 yamt 349: if (VMSPACE_IS_KERNEL_P(uio->uio_vmspace))
1.252 uwe 350: return (0);
1.64 thorpej 351:
352: if (iov->iov_len < (size_t) space)
353: space = iov->iov_len;
354: if (space > SOCK_LOAN_CHUNK)
355: space = SOCK_LOAN_CHUNK;
356:
357: eva = round_page((vaddr_t) iov->iov_base + space);
358: sva = trunc_page((vaddr_t) iov->iov_base);
359: len = eva - sva;
360: npgs = len >> PAGE_SHIFT;
361:
1.79 thorpej 362: KASSERT(npgs <= M_EXT_MAXPAGES);
363:
1.209 matt 364: lva = sokvaalloc(sva, len, so);
1.64 thorpej 365: if (lva == 0)
1.252 uwe 366: return 0;
1.64 thorpej 367:
1.116 yamt 368: error = uvm_loan(&uio->uio_vmspace->vm_map, sva, len,
1.79 thorpej 369: m->m_ext.ext_pgs, UVM_LOAN_TOPAGE);
1.64 thorpej 370: if (error) {
1.80 yamt 371: sokvafree(lva, len);
1.252 uwe 372: return (0);
1.64 thorpej 373: }
374:
375: for (i = 0, va = lva; i < npgs; i++, va += PAGE_SIZE)
1.79 thorpej 376: pmap_kenter_pa(va, VM_PAGE_TO_PHYS(m->m_ext.ext_pgs[i]),
1.194 cegger 377: VM_PROT_READ, 0);
1.64 thorpej 378: pmap_update(pmap_kernel());
379:
380: lva += (vaddr_t) iov->iov_base & PAGE_MASK;
381:
1.134 christos 382: MEXTADD(m, (void *) lva, space, M_MBUF, soloanfree, so);
1.79 thorpej 383: m->m_flags |= M_EXT_PAGES | M_EXT_ROMAP;
1.64 thorpej 384:
385: uio->uio_resid -= space;
386: /* uio_offset not updated, not set/used for write(2) */
1.134 christos 387: uio->uio_iov->iov_base = (char *)uio->uio_iov->iov_base + space;
1.64 thorpej 388: uio->uio_iov->iov_len -= space;
389: if (uio->uio_iov->iov_len == 0) {
390: uio->uio_iov++;
391: uio->uio_iovcnt--;
392: }
393:
394: return (space);
395: }
396:
1.142 dyoung 397: struct mbuf *
1.147 dyoung 398: getsombuf(struct socket *so, int type)
1.142 dyoung 399: {
400: struct mbuf *m;
401:
1.147 dyoung 402: m = m_get(M_WAIT, type);
1.142 dyoung 403: MCLAIM(m, so->so_mowner);
404: return m;
405: }
406:
1.191 elad 407: static int
408: socket_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie,
409: void *arg0, void *arg1, void *arg2, void *arg3)
410: {
411: int result;
412: enum kauth_network_req req;
413:
414: result = KAUTH_RESULT_DEFER;
415: req = (enum kauth_network_req)arg0;
416:
1.193 elad 417: if ((action != KAUTH_NETWORK_SOCKET) &&
418: (action != KAUTH_NETWORK_BIND))
1.191 elad 419: return result;
420:
421: switch (req) {
1.193 elad 422: case KAUTH_REQ_NETWORK_BIND_PORT:
423: result = KAUTH_RESULT_ALLOW;
424: break;
425:
1.191 elad 426: case KAUTH_REQ_NETWORK_SOCKET_DROP: {
427: /* Normal users can only drop their own connections. */
428: struct socket *so = (struct socket *)arg1;
429:
1.220 christos 430: if (so->so_cred && proc_uidmatch(cred, so->so_cred) == 0)
1.191 elad 431: result = KAUTH_RESULT_ALLOW;
432:
433: break;
434: }
435:
436: case KAUTH_REQ_NETWORK_SOCKET_OPEN:
437: /* We allow "raw" routing/bluetooth sockets to anyone. */
1.254 christos 438: switch ((u_long)arg1) {
439: case PF_ROUTE:
440: case PF_OROUTE:
441: case PF_BLUETOOTH:
1.255 bouyer 442: case PF_CAN:
1.191 elad 443: result = KAUTH_RESULT_ALLOW;
1.254 christos 444: break;
445: default:
1.191 elad 446: /* Privileged, let secmodel handle this. */
447: if ((u_long)arg2 == SOCK_RAW)
448: break;
1.254 christos 449: result = KAUTH_RESULT_ALLOW;
450: break;
1.191 elad 451: }
452: break;
453:
1.192 elad 454: case KAUTH_REQ_NETWORK_SOCKET_CANSEE:
455: result = KAUTH_RESULT_ALLOW;
456:
457: break;
458:
1.191 elad 459: default:
460: break;
461: }
462:
463: return result;
464: }
465:
1.119 yamt 466: void
467: soinit(void)
468: {
469:
1.212 pooka 470: sysctl_kern_socket_setup();
1.178 pooka 471:
1.148 ad 472: mutex_init(&so_pendfree_lock, MUTEX_DEFAULT, IPL_VM);
1.160 ad 473: softnet_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
1.136 ad 474: cv_init(&socurkva_cv, "sokva");
1.205 bouyer 475: cv_init(&pendfree_thread_cv, "sopendfr");
1.166 ad 476: soinit2();
1.136 ad 477:
1.119 yamt 478: /* Set the initial adjusted socket buffer size. */
479: if (sb_max_set(sb_max))
480: panic("bad initial sb_max value: %lu", sb_max);
481:
1.191 elad 482: socket_listener = kauth_listen_scope(KAUTH_SCOPE_NETWORK,
483: socket_listener_cb, NULL);
1.119 yamt 484: }
485:
1.205 bouyer 486: void
487: soinit1(void)
488: {
489: int error = kthread_create(PRI_NONE, KTHREAD_MPSAFE, NULL,
490: sopendfree_thread, NULL, &sopendfree_lwp, "sopendfree");
491: if (error)
492: panic("soinit1 %d", error);
493: }
494:
1.1 cgd 495: /*
1.222 rmind 496: * socreate: create a new socket of the specified type and the protocol.
497: *
498: * => Caller may specify another socket for lock sharing (must not be held).
499: * => Returns the new socket without lock held.
1.224 rmind 500: */
1.3 andrew 501: int
1.160 ad 502: socreate(int dom, struct socket **aso, int type, int proto, struct lwp *l,
503: struct socket *lockso)
1.1 cgd 504: {
1.99 matt 505: const struct protosw *prp;
1.54 lukem 506: struct socket *so;
1.115 yamt 507: uid_t uid;
1.160 ad 508: int error;
509: kmutex_t *lock;
1.1 cgd 510:
1.132 elad 511: error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_SOCKET,
512: KAUTH_REQ_NETWORK_SOCKET_OPEN, KAUTH_ARG(dom), KAUTH_ARG(type),
513: KAUTH_ARG(proto));
1.140 dyoung 514: if (error != 0)
515: return error;
1.127 elad 516:
1.1 cgd 517: if (proto)
518: prp = pffindproto(dom, proto, type);
519: else
520: prp = pffindtype(dom, type);
1.140 dyoung 521: if (prp == NULL) {
1.120 ginsbach 522: /* no support for domain */
523: if (pffinddomain(dom) == 0)
1.140 dyoung 524: return EAFNOSUPPORT;
1.120 ginsbach 525: /* no support for socket type */
526: if (proto == 0 && type != 0)
1.140 dyoung 527: return EPROTOTYPE;
528: return EPROTONOSUPPORT;
1.120 ginsbach 529: }
1.223 rmind 530: if (prp->pr_usrreqs == NULL)
1.140 dyoung 531: return EPROTONOSUPPORT;
1.1 cgd 532: if (prp->pr_type != type)
1.140 dyoung 533: return EPROTOTYPE;
1.160 ad 534:
535: so = soget(true);
1.1 cgd 536: so->so_type = type;
537: so->so_proto = prp;
1.33 matt 538: so->so_send = sosend;
539: so->so_receive = soreceive;
1.78 matt 540: #ifdef MBUFTRACE
541: so->so_rcv.sb_mowner = &prp->pr_domain->dom_mowner;
542: so->so_snd.sb_mowner = &prp->pr_domain->dom_mowner;
543: so->so_mowner = &prp->pr_domain->dom_mowner;
544: #endif
1.138 rmind 545: uid = kauth_cred_geteuid(l->l_cred);
1.115 yamt 546: so->so_uidinfo = uid_find(uid);
1.168 yamt 547: so->so_cpid = l->l_proc->p_pid;
1.224 rmind 548:
549: /*
550: * Lock assigned and taken during PCB attach, unless we share
551: * the lock with another socket, e.g. socketpair(2) case.
552: */
553: if (lockso) {
1.160 ad 554: lock = lockso->so_lock;
555: so->so_lock = lock;
556: mutex_obj_hold(lock);
557: mutex_enter(lock);
558: }
1.224 rmind 559:
560: /* Attach the PCB (returns with the socket lock held). */
561: error = (*prp->pr_usrreqs->pr_attach)(so, proto);
1.160 ad 562: KASSERT(solocked(so));
1.224 rmind 563:
564: if (error) {
1.222 rmind 565: KASSERT(so->so_pcb == NULL);
1.1 cgd 566: so->so_state |= SS_NOFDREF;
567: sofree(so);
1.140 dyoung 568: return error;
1.1 cgd 569: }
1.198 elad 570: so->so_cred = kauth_cred_dup(l->l_cred);
1.160 ad 571: sounlock(so);
1.224 rmind 572:
1.1 cgd 573: *aso = so;
1.140 dyoung 574: return 0;
1.1 cgd 575: }
576:
1.222 rmind 577: /*
578: * fsocreate: create a socket and a file descriptor associated with it.
579: *
580: * => On success, write file descriptor to fdout and return zero.
581: * => On failure, return non-zero; *fdout will be undefined.
1.142 dyoung 582: */
583: int
1.222 rmind 584: fsocreate(int domain, struct socket **sop, int type, int proto, int *fdout)
1.142 dyoung 585: {
1.222 rmind 586: lwp_t *l = curlwp;
587: int error, fd, flags;
588: struct socket *so;
589: struct file *fp;
1.142 dyoung 590:
1.222 rmind 591: if ((error = fd_allocfile(&fp, &fd)) != 0) {
1.204 christos 592: return error;
1.222 rmind 593: }
594: flags = type & SOCK_FLAGS_MASK;
1.204 christos 595: fd_set_exclose(l, fd, (flags & SOCK_CLOEXEC) != 0);
1.207 christos 596: fp->f_flag = FREAD|FWRITE|((flags & SOCK_NONBLOCK) ? FNONBLOCK : 0)|
597: ((flags & SOCK_NOSIGPIPE) ? FNOSIGPIPE : 0);
1.142 dyoung 598: fp->f_type = DTYPE_SOCKET;
599: fp->f_ops = &socketops;
1.222 rmind 600:
601: type &= ~SOCK_FLAGS_MASK;
602: error = socreate(domain, &so, type, proto, l, NULL);
603: if (error) {
1.155 ad 604: fd_abort(curproc, fp, fd);
1.222 rmind 605: return error;
606: }
607: if (flags & SOCK_NONBLOCK) {
608: so->so_state |= SS_NBIO;
609: }
1.235 matt 610: fp->f_socket = so;
1.222 rmind 611: fd_affix(curproc, fp, fd);
612:
613: if (sop != NULL) {
614: *sop = so;
1.142 dyoung 615: }
1.222 rmind 616: *fdout = fd;
1.142 dyoung 617: return error;
618: }
619:
1.3 andrew 620: int
1.190 dyoung 621: sofamily(const struct socket *so)
622: {
623: const struct protosw *pr;
624: const struct domain *dom;
625:
626: if ((pr = so->so_proto) == NULL)
627: return AF_UNSPEC;
628: if ((dom = pr->pr_domain) == NULL)
629: return AF_UNSPEC;
630: return dom->dom_family;
631: }
632:
633: int
1.236 rtr 634: sobind(struct socket *so, struct sockaddr *nam, struct lwp *l)
1.1 cgd 635: {
1.160 ad 636: int error;
1.1 cgd 637:
1.160 ad 638: solock(so);
1.237 rtr 639: if (nam->sa_family != so->so_proto->pr_domain->dom_family) {
640: sounlock(so);
1.238 rtr 641: return EAFNOSUPPORT;
1.237 rtr 642: }
1.231 rtr 643: error = (*so->so_proto->pr_usrreqs->pr_bind)(so, nam, l);
1.160 ad 644: sounlock(so);
1.140 dyoung 645: return error;
1.1 cgd 646: }
647:
1.3 andrew 648: int
1.150 elad 649: solisten(struct socket *so, int backlog, struct lwp *l)
1.1 cgd 650: {
1.160 ad 651: int error;
1.247 rjs 652: short oldopt, oldqlimit;
1.1 cgd 653:
1.160 ad 654: solock(so);
1.253 ryo 655: if ((so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING |
1.163 ad 656: SS_ISDISCONNECTING)) != 0) {
1.222 rmind 657: sounlock(so);
658: return EINVAL;
1.163 ad 659: }
1.247 rjs 660: oldopt = so->so_options;
661: oldqlimit = so->so_qlimit;
662: if (TAILQ_EMPTY(&so->so_q))
663: so->so_options |= SO_ACCEPTCONN;
664: if (backlog < 0)
665: backlog = 0;
666: so->so_qlimit = min(backlog, somaxconn);
667:
1.231 rtr 668: error = (*so->so_proto->pr_usrreqs->pr_listen)(so, l);
1.140 dyoung 669: if (error != 0) {
1.247 rjs 670: so->so_options = oldopt;
671: so->so_qlimit = oldqlimit;
1.160 ad 672: sounlock(so);
1.140 dyoung 673: return error;
1.1 cgd 674: }
1.160 ad 675: sounlock(so);
1.140 dyoung 676: return 0;
1.1 cgd 677: }
678:
1.21 christos 679: void
1.54 lukem 680: sofree(struct socket *so)
1.1 cgd 681: {
1.161 ad 682: u_int refs;
1.1 cgd 683:
1.160 ad 684: KASSERT(solocked(so));
685:
686: if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0) {
687: sounlock(so);
1.1 cgd 688: return;
1.160 ad 689: }
1.43 mycroft 690: if (so->so_head) {
691: /*
692: * We must not decommission a socket that's on the accept(2)
693: * queue. If we do, then accept(2) may hang after select(2)
694: * indicated that the listening socket was ready.
695: */
1.160 ad 696: if (!soqremque(so, 0)) {
697: sounlock(so);
1.43 mycroft 698: return;
1.160 ad 699: }
1.43 mycroft 700: }
1.98 christos 701: if (so->so_rcv.sb_hiwat)
1.110 christos 702: (void)chgsbsize(so->so_uidinfo, &so->so_rcv.sb_hiwat, 0,
1.98 christos 703: RLIM_INFINITY);
704: if (so->so_snd.sb_hiwat)
1.110 christos 705: (void)chgsbsize(so->so_uidinfo, &so->so_snd.sb_hiwat, 0,
1.98 christos 706: RLIM_INFINITY);
707: sbrelease(&so->so_snd, so);
1.160 ad 708: KASSERT(!cv_has_waiters(&so->so_cv));
709: KASSERT(!cv_has_waiters(&so->so_rcv.sb_cv));
710: KASSERT(!cv_has_waiters(&so->so_snd.sb_cv));
1.1 cgd 711: sorflush(so);
1.161 ad 712: refs = so->so_aborting; /* XXX */
1.177 ad 713: /* Remove acccept filter if one is present. */
1.170 tls 714: if (so->so_accf != NULL)
1.177 ad 715: (void)accept_filt_clear(so);
1.160 ad 716: sounlock(so);
1.161 ad 717: if (refs == 0) /* XXX */
718: soput(so);
1.1 cgd 719: }
720:
721: /*
1.222 rmind 722: * soclose: close a socket on last file table reference removal.
723: * Initiate disconnect if connected. Free socket when disconnect complete.
1.1 cgd 724: */
1.3 andrew 725: int
1.54 lukem 726: soclose(struct socket *so)
1.1 cgd 727: {
1.222 rmind 728: struct socket *so2;
729: int error = 0;
1.1 cgd 730:
1.160 ad 731: solock(so);
1.1 cgd 732: if (so->so_options & SO_ACCEPTCONN) {
1.172 ad 733: for (;;) {
734: if ((so2 = TAILQ_FIRST(&so->so_q0)) != 0) {
1.160 ad 735: KASSERT(solocked2(so, so2));
736: (void) soqremque(so2, 0);
737: /* soabort drops the lock. */
738: (void) soabort(so2);
739: solock(so);
1.172 ad 740: continue;
1.160 ad 741: }
1.172 ad 742: if ((so2 = TAILQ_FIRST(&so->so_q)) != 0) {
1.160 ad 743: KASSERT(solocked2(so, so2));
744: (void) soqremque(so2, 1);
745: /* soabort drops the lock. */
746: (void) soabort(so2);
747: solock(so);
1.172 ad 748: continue;
1.160 ad 749: }
1.172 ad 750: break;
751: }
1.1 cgd 752: }
1.222 rmind 753: if (so->so_pcb == NULL)
1.1 cgd 754: goto discard;
755: if (so->so_state & SS_ISCONNECTED) {
756: if ((so->so_state & SS_ISDISCONNECTING) == 0) {
757: error = sodisconnect(so);
758: if (error)
759: goto drop;
760: }
761: if (so->so_options & SO_LINGER) {
1.206 christos 762: if ((so->so_state & (SS_ISDISCONNECTING|SS_NBIO)) ==
763: (SS_ISDISCONNECTING|SS_NBIO))
1.1 cgd 764: goto drop;
1.21 christos 765: while (so->so_state & SS_ISCONNECTED) {
1.185 yamt 766: error = sowait(so, true, so->so_linger * hz);
1.21 christos 767: if (error)
1.1 cgd 768: break;
1.21 christos 769: }
1.1 cgd 770: }
771: }
1.54 lukem 772: drop:
1.1 cgd 773: if (so->so_pcb) {
1.224 rmind 774: KASSERT(solocked(so));
775: (*so->so_proto->pr_usrreqs->pr_detach)(so);
1.1 cgd 776: }
1.54 lukem 777: discard:
1.222 rmind 778: KASSERT((so->so_state & SS_NOFDREF) == 0);
1.198 elad 779: kauth_cred_free(so->so_cred);
1.1 cgd 780: so->so_state |= SS_NOFDREF;
781: sofree(so);
1.222 rmind 782: return error;
1.1 cgd 783: }
784:
785: /*
1.160 ad 786: * Must be called with the socket locked.. Will return with it unlocked.
1.1 cgd 787: */
1.3 andrew 788: int
1.54 lukem 789: soabort(struct socket *so)
1.1 cgd 790: {
1.161 ad 791: u_int refs;
1.139 yamt 792: int error;
1.253 ryo 793:
1.160 ad 794: KASSERT(solocked(so));
795: KASSERT(so->so_head == NULL);
1.1 cgd 796:
1.161 ad 797: so->so_aborting++; /* XXX */
1.230 mrg 798: error = (*so->so_proto->pr_usrreqs->pr_abort)(so);
1.161 ad 799: refs = --so->so_aborting; /* XXX */
1.164 drochner 800: if (error || (refs == 0)) {
1.139 yamt 801: sofree(so);
1.160 ad 802: } else {
803: sounlock(so);
1.139 yamt 804: }
805: return error;
1.1 cgd 806: }
807:
1.3 andrew 808: int
1.239 rtr 809: soaccept(struct socket *so, struct sockaddr *nam)
1.1 cgd 810: {
1.222 rmind 811: int error;
1.160 ad 812:
813: KASSERT(solocked(so));
1.222 rmind 814: KASSERT((so->so_state & SS_NOFDREF) != 0);
1.1 cgd 815:
816: so->so_state &= ~SS_NOFDREF;
1.55 thorpej 817: if ((so->so_state & SS_ISDISCONNECTED) == 0 ||
818: (so->so_proto->pr_flags & PR_ABRTACPTDIS) == 0)
1.225 rtr 819: error = (*so->so_proto->pr_usrreqs->pr_accept)(so, nam);
1.41 mycroft 820: else
1.53 itojun 821: error = ECONNABORTED;
1.52 itojun 822:
1.222 rmind 823: return error;
1.1 cgd 824: }
825:
1.3 andrew 826: int
1.240 rtr 827: soconnect(struct socket *so, struct sockaddr *nam, struct lwp *l)
1.1 cgd 828: {
1.222 rmind 829: int error;
1.160 ad 830:
831: KASSERT(solocked(so));
1.1 cgd 832:
833: if (so->so_options & SO_ACCEPTCONN)
1.222 rmind 834: return EOPNOTSUPP;
1.1 cgd 835: /*
836: * If protocol is connection-based, can only connect once.
837: * Otherwise, if connected, try to disconnect first.
838: * This allows user to disconnect by connecting to, e.g.,
839: * a null address.
840: */
841: if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
842: ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
1.241 rtr 843: (error = sodisconnect(so)))) {
1.1 cgd 844: error = EISCONN;
1.241 rtr 845: } else {
1.242 rtr 846: if (nam->sa_family != so->so_proto->pr_domain->dom_family) {
1.241 rtr 847: return EAFNOSUPPORT;
848: }
1.231 rtr 849: error = (*so->so_proto->pr_usrreqs->pr_connect)(so, nam, l);
1.241 rtr 850: }
1.222 rmind 851:
852: return error;
1.1 cgd 853: }
854:
1.3 andrew 855: int
1.54 lukem 856: soconnect2(struct socket *so1, struct socket *so2)
1.1 cgd 857: {
1.160 ad 858: KASSERT(solocked2(so1, so2));
1.1 cgd 859:
1.234 rtr 860: return (*so1->so_proto->pr_usrreqs->pr_connect2)(so1, so2);
1.1 cgd 861: }
862:
1.3 andrew 863: int
1.54 lukem 864: sodisconnect(struct socket *so)
1.1 cgd 865: {
1.160 ad 866: int error;
867:
868: KASSERT(solocked(so));
1.1 cgd 869:
870: if ((so->so_state & SS_ISCONNECTED) == 0) {
871: error = ENOTCONN;
1.160 ad 872: } else if (so->so_state & SS_ISDISCONNECTING) {
1.1 cgd 873: error = EALREADY;
1.160 ad 874: } else {
1.229 rtr 875: error = (*so->so_proto->pr_usrreqs->pr_disconnect)(so);
1.1 cgd 876: }
877: return (error);
878: }
879:
1.15 mycroft 880: #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK)
1.1 cgd 881: /*
882: * Send on a socket.
883: * If send must go all at once and message is larger than
884: * send buffering, then hard error.
885: * Lock against other senders.
886: * If must go all at once and not enough room now, then
887: * inform user that this would block and do nothing.
888: * Otherwise, if nonblocking, send as much as possible.
889: * The data to be sent is described by "uio" if nonzero,
890: * otherwise by the mbuf chain "top" (which must be null
891: * if uio is not). Data provided in mbuf chain must be small
892: * enough to send all at once.
893: *
894: * Returns nonzero on error, timeout or signal; callers
895: * must check for short counts if EINTR/ERESTART are returned.
896: * Data and control buffers are freed on return.
897: */
1.3 andrew 898: int
1.245 rtr 899: sosend(struct socket *so, struct sockaddr *addr, struct uio *uio,
900: struct mbuf *top, struct mbuf *control, int flags, struct lwp *l)
1.1 cgd 901: {
1.54 lukem 902: struct mbuf **mp, *m;
1.58 jdolecek 903: long space, len, resid, clen, mlen;
904: int error, s, dontroute, atomic;
1.196 dsl 905: short wakeup_state = 0;
1.54 lukem 906:
1.160 ad 907: clen = 0;
1.64 thorpej 908:
1.160 ad 909: /*
910: * solock() provides atomicity of access. splsoftnet() prevents
911: * protocol processing soft interrupts from interrupting us and
912: * blocking (expensive).
913: */
914: s = splsoftnet();
915: solock(so);
1.54 lukem 916: atomic = sosendallatonce(so) || top;
1.1 cgd 917: if (uio)
918: resid = uio->uio_resid;
919: else
920: resid = top->m_pkthdr.len;
1.7 cgd 921: /*
922: * In theory resid should be unsigned.
923: * However, space must be signed, as it might be less than 0
924: * if we over-committed, and we must use a signed comparison
925: * of space and resid. On the other hand, a negative resid
926: * causes us to loop sending 0-length segments to the protocol.
927: */
1.29 mycroft 928: if (resid < 0) {
929: error = EINVAL;
930: goto out;
931: }
1.1 cgd 932: dontroute =
933: (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
934: (so->so_proto->pr_flags & PR_ATOMIC);
1.165 christos 935: l->l_ru.ru_msgsnd++;
1.1 cgd 936: if (control)
937: clen = control->m_len;
1.54 lukem 938: restart:
1.21 christos 939: if ((error = sblock(&so->so_snd, SBLOCKWAIT(flags))) != 0)
1.1 cgd 940: goto out;
941: do {
1.160 ad 942: if (so->so_state & SS_CANTSENDMORE) {
943: error = EPIPE;
944: goto release;
945: }
1.48 thorpej 946: if (so->so_error) {
947: error = so->so_error;
948: so->so_error = 0;
949: goto release;
950: }
1.1 cgd 951: if ((so->so_state & SS_ISCONNECTED) == 0) {
952: if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
1.217 rmind 953: if (resid || clen == 0) {
1.160 ad 954: error = ENOTCONN;
955: goto release;
956: }
1.244 rtr 957: } else if (addr == NULL) {
1.160 ad 958: error = EDESTADDRREQ;
959: goto release;
960: }
1.1 cgd 961: }
962: space = sbspace(&so->so_snd);
963: if (flags & MSG_OOB)
964: space += 1024;
1.21 christos 965: if ((atomic && resid > so->so_snd.sb_hiwat) ||
1.160 ad 966: clen > so->so_snd.sb_hiwat) {
967: error = EMSGSIZE;
968: goto release;
969: }
1.96 mycroft 970: if (space < resid + clen &&
1.1 cgd 971: (atomic || space < so->so_snd.sb_lowat || space < clen)) {
1.206 christos 972: if ((so->so_state & SS_NBIO) || (flags & MSG_NBIO)) {
1.160 ad 973: error = EWOULDBLOCK;
974: goto release;
975: }
1.1 cgd 976: sbunlock(&so->so_snd);
1.196 dsl 977: if (wakeup_state & SS_RESTARTSYS) {
978: error = ERESTART;
979: goto out;
980: }
1.1 cgd 981: error = sbwait(&so->so_snd);
982: if (error)
983: goto out;
1.196 dsl 984: wakeup_state = so->so_state;
1.1 cgd 985: goto restart;
986: }
1.196 dsl 987: wakeup_state = 0;
1.1 cgd 988: mp = ⊤
989: space -= clen;
990: do {
1.45 tv 991: if (uio == NULL) {
992: /*
993: * Data is prepackaged in "top".
994: */
995: resid = 0;
996: if (flags & MSG_EOR)
997: top->m_flags |= M_EOR;
998: } else do {
1.160 ad 999: sounlock(so);
1000: splx(s);
1.144 dyoung 1001: if (top == NULL) {
1.78 matt 1002: m = m_gethdr(M_WAIT, MT_DATA);
1.45 tv 1003: mlen = MHLEN;
1004: m->m_pkthdr.len = 0;
1.248 ozaki-r 1005: m_reset_rcvif(m);
1.45 tv 1006: } else {
1.78 matt 1007: m = m_get(M_WAIT, MT_DATA);
1.45 tv 1008: mlen = MLEN;
1009: }
1.78 matt 1010: MCLAIM(m, so->so_snd.sb_mowner);
1.121 yamt 1011: if (sock_loan_thresh >= 0 &&
1012: uio->uio_iov->iov_len >= sock_loan_thresh &&
1013: space >= sock_loan_thresh &&
1.64 thorpej 1014: (len = sosend_loan(so, uio, m,
1.252 uwe 1015: space)) != 0) {
1.64 thorpej 1016: SOSEND_COUNTER_INCR(&sosend_loan_big);
1017: space -= len;
1018: goto have_data;
1019: }
1.45 tv 1020: if (resid >= MINCLSIZE && space >= MCLBYTES) {
1.64 thorpej 1021: SOSEND_COUNTER_INCR(&sosend_copy_big);
1.201 oki 1022: m_clget(m, M_DONTWAIT);
1.45 tv 1023: if ((m->m_flags & M_EXT) == 0)
1024: goto nopages;
1025: mlen = MCLBYTES;
1026: if (atomic && top == 0) {
1.58 jdolecek 1027: len = lmin(MCLBYTES - max_hdr,
1.54 lukem 1028: resid);
1.45 tv 1029: m->m_data += max_hdr;
1030: } else
1.58 jdolecek 1031: len = lmin(MCLBYTES, resid);
1.45 tv 1032: space -= len;
1033: } else {
1.64 thorpej 1034: nopages:
1035: SOSEND_COUNTER_INCR(&sosend_copy_small);
1.58 jdolecek 1036: len = lmin(lmin(mlen, resid), space);
1.45 tv 1037: space -= len;
1038: /*
1039: * For datagram protocols, leave room
1040: * for protocol headers in first mbuf.
1041: */
1042: if (atomic && top == 0 && len < mlen)
1043: MH_ALIGN(m, len);
1044: }
1.144 dyoung 1045: error = uiomove(mtod(m, void *), (int)len, uio);
1.64 thorpej 1046: have_data:
1.45 tv 1047: resid = uio->uio_resid;
1048: m->m_len = len;
1049: *mp = m;
1050: top->m_pkthdr.len += len;
1.160 ad 1051: s = splsoftnet();
1052: solock(so);
1.144 dyoung 1053: if (error != 0)
1.45 tv 1054: goto release;
1055: mp = &m->m_next;
1056: if (resid <= 0) {
1057: if (flags & MSG_EOR)
1058: top->m_flags |= M_EOR;
1059: break;
1060: }
1061: } while (space > 0 && atomic);
1.108 perry 1062:
1.160 ad 1063: if (so->so_state & SS_CANTSENDMORE) {
1064: error = EPIPE;
1065: goto release;
1066: }
1.45 tv 1067: if (dontroute)
1068: so->so_options |= SO_DONTROUTE;
1069: if (resid > 0)
1070: so->so_state |= SS_MORETOCOME;
1.240 rtr 1071: if (flags & MSG_OOB) {
1.253 ryo 1072: error = (*so->so_proto->pr_usrreqs->pr_sendoob)(
1073: so, top, control);
1.240 rtr 1074: } else {
1.232 rtr 1075: error = (*so->so_proto->pr_usrreqs->pr_send)(so,
1.245 rtr 1076: top, addr, control, l);
1.240 rtr 1077: }
1.45 tv 1078: if (dontroute)
1079: so->so_options &= ~SO_DONTROUTE;
1080: if (resid > 0)
1081: so->so_state &= ~SS_MORETOCOME;
1082: clen = 0;
1.144 dyoung 1083: control = NULL;
1084: top = NULL;
1.45 tv 1085: mp = ⊤
1.144 dyoung 1086: if (error != 0)
1.1 cgd 1087: goto release;
1088: } while (resid && space > 0);
1089: } while (resid);
1090:
1.54 lukem 1091: release:
1.1 cgd 1092: sbunlock(&so->so_snd);
1.54 lukem 1093: out:
1.160 ad 1094: sounlock(so);
1095: splx(s);
1.1 cgd 1096: if (top)
1097: m_freem(top);
1098: if (control)
1099: m_freem(control);
1100: return (error);
1101: }
1102:
1103: /*
1.159 ad 1104: * Following replacement or removal of the first mbuf on the first
1105: * mbuf chain of a socket buffer, push necessary state changes back
1106: * into the socket buffer so that other consumers see the values
1107: * consistently. 'nextrecord' is the callers locally stored value of
1108: * the original value of sb->sb_mb->m_nextpkt which must be restored
1109: * when the lead mbuf changes. NOTE: 'nextrecord' may be NULL.
1110: */
1111: static void
1112: sbsync(struct sockbuf *sb, struct mbuf *nextrecord)
1113: {
1114:
1.160 ad 1115: KASSERT(solocked(sb->sb_so));
1116:
1.159 ad 1117: /*
1118: * First, update for the new value of nextrecord. If necessary,
1119: * make it the first record.
1120: */
1121: if (sb->sb_mb != NULL)
1122: sb->sb_mb->m_nextpkt = nextrecord;
1123: else
1124: sb->sb_mb = nextrecord;
1125:
1126: /*
1127: * Now update any dependent socket buffer fields to reflect
1128: * the new state. This is an inline of SB_EMPTY_FIXUP, with
1129: * the addition of a second clause that takes care of the
1130: * case where sb_mb has been updated, but remains the last
1131: * record.
1132: */
1133: if (sb->sb_mb == NULL) {
1134: sb->sb_mbtail = NULL;
1135: sb->sb_lastrecord = NULL;
1136: } else if (sb->sb_mb->m_nextpkt == NULL)
1137: sb->sb_lastrecord = sb->sb_mb;
1138: }
1139:
1140: /*
1.1 cgd 1141: * Implement receive operations on a socket.
1142: * We depend on the way that records are added to the sockbuf
1143: * by sbappend*. In particular, each record (mbufs linked through m_next)
1144: * must begin with an address if the protocol so specifies,
1145: * followed by an optional mbuf or mbufs containing ancillary data,
1146: * and then zero or more mbufs of data.
1147: * In order to avoid blocking network interrupts for the entire time here,
1148: * we splx() while doing the actual copy to user space.
1149: * Although the sockbuf is locked, new data may still be appended,
1150: * and thus we must maintain consistency of the sockbuf during that time.
1151: *
1152: * The caller may receive the data as a single mbuf chain by supplying
1153: * an mbuf **mp0 for use in returning the chain. The uio is then used
1154: * only for the count in uio_resid.
1155: */
1.3 andrew 1156: int
1.54 lukem 1157: soreceive(struct socket *so, struct mbuf **paddr, struct uio *uio,
1158: struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
1.1 cgd 1159: {
1.116 yamt 1160: struct lwp *l = curlwp;
1.160 ad 1161: struct mbuf *m, **mp, *mt;
1.211 chs 1162: size_t len, offset, moff, orig_resid;
1163: int atomic, flags, error, s, type;
1.99 matt 1164: const struct protosw *pr;
1.54 lukem 1165: struct mbuf *nextrecord;
1.67 he 1166: int mbuf_removed = 0;
1.146 dyoung 1167: const struct domain *dom;
1.196 dsl 1168: short wakeup_state = 0;
1.64 thorpej 1169:
1.54 lukem 1170: pr = so->so_proto;
1.146 dyoung 1171: atomic = pr->pr_flags & PR_ATOMIC;
1172: dom = pr->pr_domain;
1.1 cgd 1173: mp = mp0;
1.54 lukem 1174: type = 0;
1175: orig_resid = uio->uio_resid;
1.102 jonathan 1176:
1.144 dyoung 1177: if (paddr != NULL)
1178: *paddr = NULL;
1179: if (controlp != NULL)
1180: *controlp = NULL;
1181: if (flagsp != NULL)
1.252 uwe 1182: flags = *flagsp &~ MSG_EOR;
1.1 cgd 1183: else
1184: flags = 0;
1.66 enami 1185:
1.1 cgd 1186: if (flags & MSG_OOB) {
1187: m = m_get(M_WAIT, MT_DATA);
1.160 ad 1188: solock(so);
1.226 rtr 1189: error = (*pr->pr_usrreqs->pr_recvoob)(so, m, flags & MSG_PEEK);
1.160 ad 1190: sounlock(so);
1.1 cgd 1191: if (error)
1192: goto bad;
1193: do {
1.134 christos 1194: error = uiomove(mtod(m, void *),
1.211 chs 1195: MIN(uio->uio_resid, m->m_len), uio);
1.1 cgd 1196: m = m_free(m);
1.144 dyoung 1197: } while (uio->uio_resid > 0 && error == 0 && m);
1.54 lukem 1198: bad:
1.144 dyoung 1199: if (m != NULL)
1.1 cgd 1200: m_freem(m);
1.144 dyoung 1201: return error;
1.1 cgd 1202: }
1.144 dyoung 1203: if (mp != NULL)
1.140 dyoung 1204: *mp = NULL;
1.160 ad 1205:
1206: /*
1207: * solock() provides atomicity of access. splsoftnet() prevents
1208: * protocol processing soft interrupts from interrupting us and
1209: * blocking (expensive).
1210: */
1211: s = splsoftnet();
1212: solock(so);
1.54 lukem 1213: restart:
1.160 ad 1214: if ((error = sblock(&so->so_rcv, SBLOCKWAIT(flags))) != 0) {
1215: sounlock(so);
1216: splx(s);
1.144 dyoung 1217: return error;
1.160 ad 1218: }
1.1 cgd 1219:
1220: m = so->so_rcv.sb_mb;
1221: /*
1222: * If we have less data than requested, block awaiting more
1223: * (subject to any timeout) if:
1.15 mycroft 1224: * 1. the current count is less than the low water mark,
1.1 cgd 1225: * 2. MSG_WAITALL is set, and it is possible to do the entire
1.15 mycroft 1226: * receive operation at once if we block (resid <= hiwat), or
1227: * 3. MSG_DONTWAIT is not set.
1.1 cgd 1228: * If MSG_WAITALL is set but resid is larger than the receive buffer,
1229: * we have to do the receive in sections, and thus risk returning
1230: * a short count if a timeout or signal occurs after we start.
1231: */
1.144 dyoung 1232: if (m == NULL ||
1233: ((flags & MSG_DONTWAIT) == 0 &&
1234: so->so_rcv.sb_cc < uio->uio_resid &&
1235: (so->so_rcv.sb_cc < so->so_rcv.sb_lowat ||
1236: ((flags & MSG_WAITALL) &&
1237: uio->uio_resid <= so->so_rcv.sb_hiwat)) &&
1.146 dyoung 1238: m->m_nextpkt == NULL && !atomic)) {
1.1 cgd 1239: #ifdef DIAGNOSTIC
1.144 dyoung 1240: if (m == NULL && so->so_rcv.sb_cc)
1.1 cgd 1241: panic("receive 1");
1242: #endif
1.255.2.3 martin 1243: if (so->so_error || so->so_rerror) {
1.144 dyoung 1244: if (m != NULL)
1.15 mycroft 1245: goto dontblock;
1.255.2.3 martin 1246: if (so->so_error) {
1247: error = so->so_error;
1248: so->so_error = 0;
1249: } else {
1250: error = so->so_rerror;
1251: so->so_rerror = 0;
1252: }
1.1 cgd 1253: goto release;
1254: }
1255: if (so->so_state & SS_CANTRCVMORE) {
1.144 dyoung 1256: if (m != NULL)
1.15 mycroft 1257: goto dontblock;
1.1 cgd 1258: else
1259: goto release;
1260: }
1.144 dyoung 1261: for (; m != NULL; m = m->m_next)
1.1 cgd 1262: if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) {
1263: m = so->so_rcv.sb_mb;
1264: goto dontblock;
1265: }
1266: if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
1267: (so->so_proto->pr_flags & PR_CONNREQUIRED)) {
1268: error = ENOTCONN;
1269: goto release;
1270: }
1271: if (uio->uio_resid == 0)
1272: goto release;
1.206 christos 1273: if ((so->so_state & SS_NBIO) ||
1274: (flags & (MSG_DONTWAIT|MSG_NBIO))) {
1.1 cgd 1275: error = EWOULDBLOCK;
1276: goto release;
1277: }
1.69 thorpej 1278: SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 1");
1279: SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 1");
1.1 cgd 1280: sbunlock(&so->so_rcv);
1.196 dsl 1281: if (wakeup_state & SS_RESTARTSYS)
1282: error = ERESTART;
1283: else
1284: error = sbwait(&so->so_rcv);
1.160 ad 1285: if (error != 0) {
1286: sounlock(so);
1287: splx(s);
1.144 dyoung 1288: return error;
1.160 ad 1289: }
1.196 dsl 1290: wakeup_state = so->so_state;
1.1 cgd 1291: goto restart;
1292: }
1.54 lukem 1293: dontblock:
1.69 thorpej 1294: /*
1295: * On entry here, m points to the first record of the socket buffer.
1.159 ad 1296: * From this point onward, we maintain 'nextrecord' as a cache of the
1297: * pointer to the next record in the socket buffer. We must keep the
1298: * various socket buffer pointers and local stack versions of the
1299: * pointers in sync, pushing out modifications before dropping the
1.160 ad 1300: * socket lock, and re-reading them when picking it up.
1.159 ad 1301: *
1302: * Otherwise, we will race with the network stack appending new data
1303: * or records onto the socket buffer by using inconsistent/stale
1304: * versions of the field, possibly resulting in socket buffer
1305: * corruption.
1306: *
1307: * By holding the high-level sblock(), we prevent simultaneous
1308: * readers from pulling off the front of the socket buffer.
1.69 thorpej 1309: */
1.144 dyoung 1310: if (l != NULL)
1.157 ad 1311: l->l_ru.ru_msgrcv++;
1.69 thorpej 1312: KASSERT(m == so->so_rcv.sb_mb);
1313: SBLASTRECORDCHK(&so->so_rcv, "soreceive 1");
1314: SBLASTMBUFCHK(&so->so_rcv, "soreceive 1");
1.1 cgd 1315: nextrecord = m->m_nextpkt;
1316: if (pr->pr_flags & PR_ADDR) {
1317: #ifdef DIAGNOSTIC
1318: if (m->m_type != MT_SONAME)
1319: panic("receive 1a");
1320: #endif
1.3 andrew 1321: orig_resid = 0;
1.1 cgd 1322: if (flags & MSG_PEEK) {
1323: if (paddr)
1324: *paddr = m_copy(m, 0, m->m_len);
1325: m = m->m_next;
1326: } else {
1327: sbfree(&so->so_rcv, m);
1.67 he 1328: mbuf_removed = 1;
1.144 dyoung 1329: if (paddr != NULL) {
1.1 cgd 1330: *paddr = m;
1331: so->so_rcv.sb_mb = m->m_next;
1.144 dyoung 1332: m->m_next = NULL;
1.1 cgd 1333: m = so->so_rcv.sb_mb;
1334: } else {
1.249 christos 1335: m = so->so_rcv.sb_mb = m_free(m);
1.1 cgd 1336: }
1.159 ad 1337: sbsync(&so->so_rcv, nextrecord);
1.1 cgd 1338: }
1339: }
1.247 rjs 1340: if (pr->pr_flags & PR_ADDR_OPT) {
1341: /*
1342: * For SCTP we may be getting a
1343: * whole message OR a partial delivery.
1344: */
1345: if (m->m_type == MT_SONAME) {
1346: orig_resid = 0;
1347: if (flags & MSG_PEEK) {
1348: if (paddr)
1349: *paddr = m_copy(m, 0, m->m_len);
1350: m = m->m_next;
1351: } else {
1352: sbfree(&so->so_rcv, m);
1353: if (paddr) {
1354: *paddr = m;
1355: so->so_rcv.sb_mb = m->m_next;
1356: m->m_next = 0;
1357: m = so->so_rcv.sb_mb;
1358: } else {
1.249 christos 1359: m = so->so_rcv.sb_mb = m_free(m);
1.247 rjs 1360: }
1361: }
1362: }
1363: }
1.159 ad 1364:
1365: /*
1366: * Process one or more MT_CONTROL mbufs present before any data mbufs
1367: * in the first mbuf chain on the socket buffer. If MSG_PEEK, we
1368: * just copy the data; if !MSG_PEEK, we call into the protocol to
1369: * perform externalization (or freeing if controlp == NULL).
1370: */
1371: if (__predict_false(m != NULL && m->m_type == MT_CONTROL)) {
1372: struct mbuf *cm = NULL, *cmn;
1373: struct mbuf **cme = &cm;
1374:
1375: do {
1376: if (flags & MSG_PEEK) {
1377: if (controlp != NULL) {
1378: *controlp = m_copy(m, 0, m->m_len);
1379: controlp = &(*controlp)->m_next;
1380: }
1381: m = m->m_next;
1382: } else {
1383: sbfree(&so->so_rcv, m);
1.1 cgd 1384: so->so_rcv.sb_mb = m->m_next;
1.144 dyoung 1385: m->m_next = NULL;
1.159 ad 1386: *cme = m;
1387: cme = &(*cme)->m_next;
1.1 cgd 1388: m = so->so_rcv.sb_mb;
1.159 ad 1389: }
1390: } while (m != NULL && m->m_type == MT_CONTROL);
1391: if ((flags & MSG_PEEK) == 0)
1392: sbsync(&so->so_rcv, nextrecord);
1393: for (; cm != NULL; cm = cmn) {
1394: cmn = cm->m_next;
1395: cm->m_next = NULL;
1396: type = mtod(cm, struct cmsghdr *)->cmsg_type;
1397: if (controlp != NULL) {
1398: if (dom->dom_externalize != NULL &&
1399: type == SCM_RIGHTS) {
1.160 ad 1400: sounlock(so);
1.159 ad 1401: splx(s);
1.204 christos 1402: error = (*dom->dom_externalize)(cm, l,
1403: (flags & MSG_CMSG_CLOEXEC) ?
1404: O_CLOEXEC : 0);
1.159 ad 1405: s = splsoftnet();
1.160 ad 1406: solock(so);
1.159 ad 1407: }
1408: *controlp = cm;
1409: while (*controlp != NULL)
1410: controlp = &(*controlp)->m_next;
1.1 cgd 1411: } else {
1.106 itojun 1412: /*
1413: * Dispose of any SCM_RIGHTS message that went
1414: * through the read path rather than recv.
1415: */
1.159 ad 1416: if (dom->dom_dispose != NULL &&
1417: type == SCM_RIGHTS) {
1.253 ryo 1418: sounlock(so);
1.159 ad 1419: (*dom->dom_dispose)(cm);
1.160 ad 1420: solock(so);
1.159 ad 1421: }
1422: m_freem(cm);
1.1 cgd 1423: }
1424: }
1.159 ad 1425: if (m != NULL)
1426: nextrecord = so->so_rcv.sb_mb->m_nextpkt;
1427: else
1428: nextrecord = so->so_rcv.sb_mb;
1429: orig_resid = 0;
1.1 cgd 1430: }
1.69 thorpej 1431:
1.159 ad 1432: /* If m is non-NULL, we have some data to read. */
1433: if (__predict_true(m != NULL)) {
1.1 cgd 1434: type = m->m_type;
1435: if (type == MT_OOBDATA)
1436: flags |= MSG_OOB;
1437: }
1.69 thorpej 1438: SBLASTRECORDCHK(&so->so_rcv, "soreceive 2");
1439: SBLASTMBUFCHK(&so->so_rcv, "soreceive 2");
1440:
1.1 cgd 1441: moff = 0;
1442: offset = 0;
1.144 dyoung 1443: while (m != NULL && uio->uio_resid > 0 && error == 0) {
1.1 cgd 1444: if (m->m_type == MT_OOBDATA) {
1445: if (type != MT_OOBDATA)
1446: break;
1447: } else if (type == MT_OOBDATA)
1448: break;
1449: #ifdef DIAGNOSTIC
1450: else if (m->m_type != MT_DATA && m->m_type != MT_HEADER)
1451: panic("receive 3");
1452: #endif
1453: so->so_state &= ~SS_RCVATMARK;
1.196 dsl 1454: wakeup_state = 0;
1.1 cgd 1455: len = uio->uio_resid;
1456: if (so->so_oobmark && len > so->so_oobmark - offset)
1457: len = so->so_oobmark - offset;
1458: if (len > m->m_len - moff)
1459: len = m->m_len - moff;
1460: /*
1461: * If mp is set, just pass back the mbufs.
1462: * Otherwise copy them out via the uio, then free.
1463: * Sockbuf must be consistent here (points to current mbuf,
1464: * it points to next record) when we drop priority;
1465: * we must note any additions to the sockbuf when we
1466: * block interrupts again.
1467: */
1.144 dyoung 1468: if (mp == NULL) {
1.69 thorpej 1469: SBLASTRECORDCHK(&so->so_rcv, "soreceive uiomove");
1470: SBLASTMBUFCHK(&so->so_rcv, "soreceive uiomove");
1.160 ad 1471: sounlock(so);
1.1 cgd 1472: splx(s);
1.211 chs 1473: error = uiomove(mtod(m, char *) + moff, len, uio);
1.20 mycroft 1474: s = splsoftnet();
1.160 ad 1475: solock(so);
1.144 dyoung 1476: if (error != 0) {
1.67 he 1477: /*
1478: * If any part of the record has been removed
1479: * (such as the MT_SONAME mbuf, which will
1480: * happen when PR_ADDR, and thus also
1481: * PR_ATOMIC, is set), then drop the entire
1482: * record to maintain the atomicity of the
1483: * receive operation.
1484: *
1485: * This avoids a later panic("receive 1a")
1486: * when compiled with DIAGNOSTIC.
1487: */
1.146 dyoung 1488: if (m && mbuf_removed && atomic)
1.67 he 1489: (void) sbdroprecord(&so->so_rcv);
1490:
1.57 jdolecek 1491: goto release;
1.67 he 1492: }
1.1 cgd 1493: } else
1494: uio->uio_resid -= len;
1495: if (len == m->m_len - moff) {
1496: if (m->m_flags & M_EOR)
1497: flags |= MSG_EOR;
1.247 rjs 1498: #ifdef SCTP
1499: if (m->m_flags & M_NOTIFICATION)
1500: flags |= MSG_NOTIFICATION;
1501: #endif /* SCTP */
1.1 cgd 1502: if (flags & MSG_PEEK) {
1503: m = m->m_next;
1504: moff = 0;
1505: } else {
1506: nextrecord = m->m_nextpkt;
1507: sbfree(&so->so_rcv, m);
1508: if (mp) {
1509: *mp = m;
1510: mp = &m->m_next;
1511: so->so_rcv.sb_mb = m = m->m_next;
1.140 dyoung 1512: *mp = NULL;
1.1 cgd 1513: } else {
1.249 christos 1514: m = so->so_rcv.sb_mb = m_free(m);
1.1 cgd 1515: }
1.69 thorpej 1516: /*
1517: * If m != NULL, we also know that
1518: * so->so_rcv.sb_mb != NULL.
1519: */
1520: KASSERT(so->so_rcv.sb_mb == m);
1521: if (m) {
1.1 cgd 1522: m->m_nextpkt = nextrecord;
1.69 thorpej 1523: if (nextrecord == NULL)
1524: so->so_rcv.sb_lastrecord = m;
1525: } else {
1526: so->so_rcv.sb_mb = nextrecord;
1.70 thorpej 1527: SB_EMPTY_FIXUP(&so->so_rcv);
1.69 thorpej 1528: }
1529: SBLASTRECORDCHK(&so->so_rcv, "soreceive 3");
1530: SBLASTMBUFCHK(&so->so_rcv, "soreceive 3");
1.1 cgd 1531: }
1.144 dyoung 1532: } else if (flags & MSG_PEEK)
1533: moff += len;
1534: else {
1.160 ad 1535: if (mp != NULL) {
1536: mt = m_copym(m, 0, len, M_NOWAIT);
1537: if (__predict_false(mt == NULL)) {
1538: sounlock(so);
1539: mt = m_copym(m, 0, len, M_WAIT);
1540: solock(so);
1541: }
1542: *mp = mt;
1543: }
1.144 dyoung 1544: m->m_data += len;
1545: m->m_len -= len;
1546: so->so_rcv.sb_cc -= len;
1.1 cgd 1547: }
1548: if (so->so_oobmark) {
1549: if ((flags & MSG_PEEK) == 0) {
1550: so->so_oobmark -= len;
1551: if (so->so_oobmark == 0) {
1552: so->so_state |= SS_RCVATMARK;
1553: break;
1554: }
1.7 cgd 1555: } else {
1.1 cgd 1556: offset += len;
1.7 cgd 1557: if (offset == so->so_oobmark)
1558: break;
1559: }
1.1 cgd 1560: }
1561: if (flags & MSG_EOR)
1562: break;
1563: /*
1564: * If the MSG_WAITALL flag is set (for non-atomic socket),
1565: * we must not quit until "uio->uio_resid == 0" or an error
1566: * termination. If a signal/timeout occurs, return
1567: * with a short count but without error.
1568: * Keep sockbuf locked against other readers.
1569: */
1.144 dyoung 1570: while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 &&
1.3 andrew 1571: !sosendallatonce(so) && !nextrecord) {
1.255.2.3 martin 1572: if (so->so_error || so->so_rerror ||
1573: so->so_state & SS_CANTRCVMORE)
1.1 cgd 1574: break;
1.68 matt 1575: /*
1576: * If we are peeking and the socket receive buffer is
1577: * full, stop since we can't get more data to peek at.
1578: */
1579: if ((flags & MSG_PEEK) && sbspace(&so->so_rcv) <= 0)
1580: break;
1581: /*
1582: * If we've drained the socket buffer, tell the
1583: * protocol in case it needs to do something to
1584: * get it filled again.
1585: */
1586: if ((pr->pr_flags & PR_WANTRCVD) && so->so_pcb)
1.233 rtr 1587: (*pr->pr_usrreqs->pr_rcvd)(so, flags, l);
1.69 thorpej 1588: SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 2");
1589: SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 2");
1.196 dsl 1590: if (wakeup_state & SS_RESTARTSYS)
1591: error = ERESTART;
1592: else
1593: error = sbwait(&so->so_rcv);
1.144 dyoung 1594: if (error != 0) {
1.1 cgd 1595: sbunlock(&so->so_rcv);
1.160 ad 1596: sounlock(so);
1.1 cgd 1597: splx(s);
1.144 dyoung 1598: return 0;
1.1 cgd 1599: }
1.21 christos 1600: if ((m = so->so_rcv.sb_mb) != NULL)
1.1 cgd 1601: nextrecord = m->m_nextpkt;
1.196 dsl 1602: wakeup_state = so->so_state;
1.1 cgd 1603: }
1604: }
1.3 andrew 1605:
1.146 dyoung 1606: if (m && atomic) {
1.3 andrew 1607: flags |= MSG_TRUNC;
1608: if ((flags & MSG_PEEK) == 0)
1609: (void) sbdroprecord(&so->so_rcv);
1610: }
1.1 cgd 1611: if ((flags & MSG_PEEK) == 0) {
1.144 dyoung 1612: if (m == NULL) {
1.69 thorpej 1613: /*
1.70 thorpej 1614: * First part is an inline SB_EMPTY_FIXUP(). Second
1.69 thorpej 1615: * part makes sure sb_lastrecord is up-to-date if
1616: * there is still data in the socket buffer.
1617: */
1.1 cgd 1618: so->so_rcv.sb_mb = nextrecord;
1.69 thorpej 1619: if (so->so_rcv.sb_mb == NULL) {
1620: so->so_rcv.sb_mbtail = NULL;
1621: so->so_rcv.sb_lastrecord = NULL;
1622: } else if (nextrecord->m_nextpkt == NULL)
1623: so->so_rcv.sb_lastrecord = nextrecord;
1624: }
1625: SBLASTRECORDCHK(&so->so_rcv, "soreceive 4");
1626: SBLASTMBUFCHK(&so->so_rcv, "soreceive 4");
1.1 cgd 1627: if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
1.233 rtr 1628: (*pr->pr_usrreqs->pr_rcvd)(so, flags, l);
1.1 cgd 1629: }
1.3 andrew 1630: if (orig_resid == uio->uio_resid && orig_resid &&
1631: (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) {
1632: sbunlock(&so->so_rcv);
1633: goto restart;
1634: }
1.108 perry 1635:
1.144 dyoung 1636: if (flagsp != NULL)
1.1 cgd 1637: *flagsp |= flags;
1.54 lukem 1638: release:
1.1 cgd 1639: sbunlock(&so->so_rcv);
1.160 ad 1640: sounlock(so);
1.1 cgd 1641: splx(s);
1.144 dyoung 1642: return error;
1.1 cgd 1643: }
1644:
1.14 mycroft 1645: int
1.54 lukem 1646: soshutdown(struct socket *so, int how)
1.1 cgd 1647: {
1.99 matt 1648: const struct protosw *pr;
1.160 ad 1649: int error;
1650:
1651: KASSERT(solocked(so));
1.34 kleink 1652:
1.54 lukem 1653: pr = so->so_proto;
1.34 kleink 1654: if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR))
1655: return (EINVAL);
1.1 cgd 1656:
1.160 ad 1657: if (how == SHUT_RD || how == SHUT_RDWR) {
1.1 cgd 1658: sorflush(so);
1.160 ad 1659: error = 0;
1660: }
1.34 kleink 1661: if (how == SHUT_WR || how == SHUT_RDWR)
1.229 rtr 1662: error = (*pr->pr_usrreqs->pr_shutdown)(so);
1.160 ad 1663:
1664: return error;
1.1 cgd 1665: }
1666:
1.195 dsl 1667: void
1.196 dsl 1668: sorestart(struct socket *so)
1.188 ad 1669: {
1.196 dsl 1670: /*
1671: * An application has called close() on an fd on which another
1672: * of its threads has called a socket system call.
1673: * Mark this and wake everyone up, and code that would block again
1674: * instead returns ERESTART.
1675: * On system call re-entry the fd is validated and EBADF returned.
1676: * Any other fd will block again on the 2nd syscall.
1677: */
1.188 ad 1678: solock(so);
1.196 dsl 1679: so->so_state |= SS_RESTARTSYS;
1.188 ad 1680: cv_broadcast(&so->so_cv);
1.196 dsl 1681: cv_broadcast(&so->so_snd.sb_cv);
1682: cv_broadcast(&so->so_rcv.sb_cv);
1.188 ad 1683: sounlock(so);
1684: }
1685:
1.14 mycroft 1686: void
1.54 lukem 1687: sorflush(struct socket *so)
1.1 cgd 1688: {
1.54 lukem 1689: struct sockbuf *sb, asb;
1.99 matt 1690: const struct protosw *pr;
1.160 ad 1691:
1692: KASSERT(solocked(so));
1.1 cgd 1693:
1.54 lukem 1694: sb = &so->so_rcv;
1695: pr = so->so_proto;
1.160 ad 1696: socantrcvmore(so);
1.1 cgd 1697: sb->sb_flags |= SB_NOINTR;
1.160 ad 1698: (void )sblock(sb, M_WAITOK);
1.1 cgd 1699: sbunlock(sb);
1700: asb = *sb;
1.86 wrstuden 1701: /*
1702: * Clear most of the sockbuf structure, but leave some of the
1703: * fields valid.
1704: */
1705: memset(&sb->sb_startzero, 0,
1706: sizeof(*sb) - offsetof(struct sockbuf, sb_startzero));
1.160 ad 1707: if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose) {
1708: sounlock(so);
1.1 cgd 1709: (*pr->pr_domain->dom_dispose)(asb.sb_mb);
1.160 ad 1710: solock(so);
1711: }
1.98 christos 1712: sbrelease(&asb, so);
1.1 cgd 1713: }
1714:
1.171 plunky 1715: /*
1716: * internal set SOL_SOCKET options
1717: */
1.142 dyoung 1718: static int
1.171 plunky 1719: sosetopt1(struct socket *so, const struct sockopt *sopt)
1.1 cgd 1720: {
1.219 christos 1721: int error = EINVAL, opt;
1722: int optval = 0; /* XXX: gcc */
1.171 plunky 1723: struct linger l;
1724: struct timeval tv;
1.142 dyoung 1725:
1.179 christos 1726: switch ((opt = sopt->sopt_name)) {
1.142 dyoung 1727:
1.170 tls 1728: case SO_ACCEPTFILTER:
1.177 ad 1729: error = accept_filt_setopt(so, sopt);
1730: KASSERT(solocked(so));
1.170 tls 1731: break;
1732:
1.253 ryo 1733: case SO_LINGER:
1734: error = sockopt_get(sopt, &l, sizeof(l));
1.177 ad 1735: solock(so);
1.253 ryo 1736: if (error)
1737: break;
1738: if (l.l_linger < 0 || l.l_linger > USHRT_MAX ||
1739: l.l_linger > (INT_MAX / hz)) {
1.177 ad 1740: error = EDOM;
1741: break;
1742: }
1.253 ryo 1743: so->so_linger = l.l_linger;
1744: if (l.l_onoff)
1745: so->so_options |= SO_LINGER;
1746: else
1747: so->so_options &= ~SO_LINGER;
1748: break;
1.1 cgd 1749:
1.142 dyoung 1750: case SO_DEBUG:
1751: case SO_KEEPALIVE:
1752: case SO_DONTROUTE:
1753: case SO_USELOOPBACK:
1754: case SO_BROADCAST:
1755: case SO_REUSEADDR:
1756: case SO_REUSEPORT:
1757: case SO_OOBINLINE:
1758: case SO_TIMESTAMP:
1.207 christos 1759: case SO_NOSIGPIPE:
1.184 christos 1760: #ifdef SO_OTIMESTAMP
1761: case SO_OTIMESTAMP:
1762: #endif
1.171 plunky 1763: error = sockopt_getint(sopt, &optval);
1.177 ad 1764: solock(so);
1.171 plunky 1765: if (error)
1.177 ad 1766: break;
1.171 plunky 1767: if (optval)
1.179 christos 1768: so->so_options |= opt;
1.142 dyoung 1769: else
1.179 christos 1770: so->so_options &= ~opt;
1.142 dyoung 1771: break;
1772:
1773: case SO_SNDBUF:
1774: case SO_RCVBUF:
1775: case SO_SNDLOWAT:
1776: case SO_RCVLOWAT:
1.171 plunky 1777: error = sockopt_getint(sopt, &optval);
1.177 ad 1778: solock(so);
1.171 plunky 1779: if (error)
1.177 ad 1780: break;
1.1 cgd 1781:
1.142 dyoung 1782: /*
1783: * Values < 1 make no sense for any of these
1784: * options, so disallow them.
1785: */
1.177 ad 1786: if (optval < 1) {
1787: error = EINVAL;
1788: break;
1789: }
1.1 cgd 1790:
1.179 christos 1791: switch (opt) {
1.171 plunky 1792: case SO_SNDBUF:
1.177 ad 1793: if (sbreserve(&so->so_snd, (u_long)optval, so) == 0) {
1794: error = ENOBUFS;
1795: break;
1796: }
1.171 plunky 1797: so->so_snd.sb_flags &= ~SB_AUTOSIZE;
1798: break;
1.1 cgd 1799:
1800: case SO_RCVBUF:
1.177 ad 1801: if (sbreserve(&so->so_rcv, (u_long)optval, so) == 0) {
1802: error = ENOBUFS;
1803: break;
1804: }
1.171 plunky 1805: so->so_rcv.sb_flags &= ~SB_AUTOSIZE;
1.142 dyoung 1806: break;
1807:
1808: /*
1809: * Make sure the low-water is never greater than
1810: * the high-water.
1811: */
1.1 cgd 1812: case SO_SNDLOWAT:
1.171 plunky 1813: if (optval > so->so_snd.sb_hiwat)
1814: optval = so->so_snd.sb_hiwat;
1815:
1816: so->so_snd.sb_lowat = optval;
1.142 dyoung 1817: break;
1.171 plunky 1818:
1.1 cgd 1819: case SO_RCVLOWAT:
1.171 plunky 1820: if (optval > so->so_rcv.sb_hiwat)
1821: optval = so->so_rcv.sb_hiwat;
1822:
1823: so->so_rcv.sb_lowat = optval;
1.142 dyoung 1824: break;
1825: }
1826: break;
1.28 thorpej 1827:
1.179 christos 1828: #ifdef COMPAT_50
1829: case SO_OSNDTIMEO:
1830: case SO_ORCVTIMEO: {
1831: struct timeval50 otv;
1832: error = sockopt_get(sopt, &otv, sizeof(otv));
1.186 pooka 1833: if (error) {
1834: solock(so);
1.183 christos 1835: break;
1.186 pooka 1836: }
1.179 christos 1837: timeval50_to_timeval(&otv, &tv);
1838: opt = opt == SO_OSNDTIMEO ? SO_SNDTIMEO : SO_RCVTIMEO;
1.182 christos 1839: error = 0;
1.179 christos 1840: /*FALLTHROUGH*/
1841: }
1842: #endif /* COMPAT_50 */
1843:
1.142 dyoung 1844: case SO_SNDTIMEO:
1845: case SO_RCVTIMEO:
1.182 christos 1846: if (error)
1.179 christos 1847: error = sockopt_get(sopt, &tv, sizeof(tv));
1.177 ad 1848: solock(so);
1.171 plunky 1849: if (error)
1.177 ad 1850: break;
1.171 plunky 1851:
1.177 ad 1852: if (tv.tv_sec > (INT_MAX - tv.tv_usec / tick) / hz) {
1853: error = EDOM;
1854: break;
1855: }
1.28 thorpej 1856:
1.171 plunky 1857: optval = tv.tv_sec * hz + tv.tv_usec / tick;
1858: if (optval == 0 && tv.tv_usec != 0)
1859: optval = 1;
1.28 thorpej 1860:
1.179 christos 1861: switch (opt) {
1.142 dyoung 1862: case SO_SNDTIMEO:
1.171 plunky 1863: so->so_snd.sb_timeo = optval;
1.1 cgd 1864: break;
1865: case SO_RCVTIMEO:
1.171 plunky 1866: so->so_rcv.sb_timeo = optval;
1.142 dyoung 1867: break;
1868: }
1869: break;
1.1 cgd 1870:
1.142 dyoung 1871: default:
1.177 ad 1872: solock(so);
1873: error = ENOPROTOOPT;
1874: break;
1.142 dyoung 1875: }
1.177 ad 1876: KASSERT(solocked(so));
1877: return error;
1.142 dyoung 1878: }
1.1 cgd 1879:
1.142 dyoung 1880: int
1.171 plunky 1881: sosetopt(struct socket *so, struct sockopt *sopt)
1.142 dyoung 1882: {
1883: int error, prerr;
1.1 cgd 1884:
1.177 ad 1885: if (sopt->sopt_level == SOL_SOCKET) {
1.171 plunky 1886: error = sosetopt1(so, sopt);
1.177 ad 1887: KASSERT(solocked(so));
1888: } else {
1.142 dyoung 1889: error = ENOPROTOOPT;
1.177 ad 1890: solock(so);
1891: }
1.1 cgd 1892:
1.142 dyoung 1893: if ((error == 0 || error == ENOPROTOOPT) &&
1894: so->so_proto != NULL && so->so_proto->pr_ctloutput != NULL) {
1895: /* give the protocol stack a shot */
1.171 plunky 1896: prerr = (*so->so_proto->pr_ctloutput)(PRCO_SETOPT, so, sopt);
1.142 dyoung 1897: if (prerr == 0)
1898: error = 0;
1899: else if (prerr != ENOPROTOOPT)
1900: error = prerr;
1.171 plunky 1901: }
1.160 ad 1902: sounlock(so);
1.142 dyoung 1903: return error;
1.1 cgd 1904: }
1905:
1.171 plunky 1906: /*
1907: * so_setsockopt() is a wrapper providing a sockopt structure for sosetopt()
1908: */
1909: int
1910: so_setsockopt(struct lwp *l, struct socket *so, int level, int name,
1911: const void *val, size_t valsize)
1912: {
1913: struct sockopt sopt;
1914: int error;
1915:
1916: KASSERT(valsize == 0 || val != NULL);
1917:
1918: sockopt_init(&sopt, level, name, valsize);
1919: sockopt_set(&sopt, val, valsize);
1920:
1921: error = sosetopt(so, &sopt);
1922:
1923: sockopt_destroy(&sopt);
1924:
1925: return error;
1926: }
1.253 ryo 1927:
1.171 plunky 1928: /*
1929: * internal get SOL_SOCKET options
1930: */
1931: static int
1932: sogetopt1(struct socket *so, struct sockopt *sopt)
1933: {
1.179 christos 1934: int error, optval, opt;
1.171 plunky 1935: struct linger l;
1936: struct timeval tv;
1937:
1.179 christos 1938: switch ((opt = sopt->sopt_name)) {
1.171 plunky 1939:
1940: case SO_ACCEPTFILTER:
1.177 ad 1941: error = accept_filt_getopt(so, sopt);
1.171 plunky 1942: break;
1943:
1944: case SO_LINGER:
1945: l.l_onoff = (so->so_options & SO_LINGER) ? 1 : 0;
1946: l.l_linger = so->so_linger;
1947:
1948: error = sockopt_set(sopt, &l, sizeof(l));
1949: break;
1950:
1951: case SO_USELOOPBACK:
1952: case SO_DONTROUTE:
1953: case SO_DEBUG:
1954: case SO_KEEPALIVE:
1955: case SO_REUSEADDR:
1956: case SO_REUSEPORT:
1957: case SO_BROADCAST:
1958: case SO_OOBINLINE:
1959: case SO_TIMESTAMP:
1.207 christos 1960: case SO_NOSIGPIPE:
1.184 christos 1961: #ifdef SO_OTIMESTAMP
1962: case SO_OTIMESTAMP:
1963: #endif
1.218 seanb 1964: case SO_ACCEPTCONN:
1.179 christos 1965: error = sockopt_setint(sopt, (so->so_options & opt) ? 1 : 0);
1.171 plunky 1966: break;
1967:
1968: case SO_TYPE:
1969: error = sockopt_setint(sopt, so->so_type);
1970: break;
1971:
1972: case SO_ERROR:
1.255.2.4! martin 1973: if (so->so_error == 0) {
! 1974: so->so_error = so->so_rerror;
! 1975: so->so_rerror = 0;
! 1976: }
1.171 plunky 1977: error = sockopt_setint(sopt, so->so_error);
1978: so->so_error = 0;
1979: break;
1980:
1981: case SO_SNDBUF:
1982: error = sockopt_setint(sopt, so->so_snd.sb_hiwat);
1983: break;
1984:
1985: case SO_RCVBUF:
1986: error = sockopt_setint(sopt, so->so_rcv.sb_hiwat);
1987: break;
1988:
1989: case SO_SNDLOWAT:
1990: error = sockopt_setint(sopt, so->so_snd.sb_lowat);
1991: break;
1992:
1993: case SO_RCVLOWAT:
1994: error = sockopt_setint(sopt, so->so_rcv.sb_lowat);
1995: break;
1996:
1.179 christos 1997: #ifdef COMPAT_50
1998: case SO_OSNDTIMEO:
1999: case SO_ORCVTIMEO: {
2000: struct timeval50 otv;
2001:
2002: optval = (opt == SO_OSNDTIMEO ?
2003: so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
2004:
2005: otv.tv_sec = optval / hz;
2006: otv.tv_usec = (optval % hz) * tick;
2007:
2008: error = sockopt_set(sopt, &otv, sizeof(otv));
2009: break;
2010: }
2011: #endif /* COMPAT_50 */
2012:
1.171 plunky 2013: case SO_SNDTIMEO:
2014: case SO_RCVTIMEO:
1.179 christos 2015: optval = (opt == SO_SNDTIMEO ?
1.171 plunky 2016: so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
2017:
2018: tv.tv_sec = optval / hz;
2019: tv.tv_usec = (optval % hz) * tick;
2020:
2021: error = sockopt_set(sopt, &tv, sizeof(tv));
2022: break;
2023:
2024: case SO_OVERFLOWED:
2025: error = sockopt_setint(sopt, so->so_rcv.sb_overflowed);
2026: break;
2027:
2028: default:
2029: error = ENOPROTOOPT;
2030: break;
2031: }
2032:
2033: return (error);
2034: }
2035:
1.14 mycroft 2036: int
1.171 plunky 2037: sogetopt(struct socket *so, struct sockopt *sopt)
1.1 cgd 2038: {
1.160 ad 2039: int error;
1.1 cgd 2040:
1.160 ad 2041: solock(so);
1.171 plunky 2042: if (sopt->sopt_level != SOL_SOCKET) {
1.1 cgd 2043: if (so->so_proto && so->so_proto->pr_ctloutput) {
1.160 ad 2044: error = ((*so->so_proto->pr_ctloutput)
1.171 plunky 2045: (PRCO_GETOPT, so, sopt));
1.1 cgd 2046: } else
1.160 ad 2047: error = (ENOPROTOOPT);
1.1 cgd 2048: } else {
1.171 plunky 2049: error = sogetopt1(so, sopt);
2050: }
2051: sounlock(so);
2052: return (error);
2053: }
2054:
2055: /*
2056: * alloc sockopt data buffer buffer
2057: * - will be released at destroy
2058: */
1.176 plunky 2059: static int
2060: sockopt_alloc(struct sockopt *sopt, size_t len, km_flag_t kmflag)
1.171 plunky 2061: {
2062:
2063: KASSERT(sopt->sopt_size == 0);
2064:
1.176 plunky 2065: if (len > sizeof(sopt->sopt_buf)) {
2066: sopt->sopt_data = kmem_zalloc(len, kmflag);
2067: if (sopt->sopt_data == NULL)
2068: return ENOMEM;
2069: } else
1.171 plunky 2070: sopt->sopt_data = sopt->sopt_buf;
2071:
2072: sopt->sopt_size = len;
1.176 plunky 2073: return 0;
1.171 plunky 2074: }
2075:
2076: /*
2077: * initialise sockopt storage
1.176 plunky 2078: * - MAY sleep during allocation
1.171 plunky 2079: */
2080: void
2081: sockopt_init(struct sockopt *sopt, int level, int name, size_t size)
2082: {
1.1 cgd 2083:
1.171 plunky 2084: memset(sopt, 0, sizeof(*sopt));
1.1 cgd 2085:
1.171 plunky 2086: sopt->sopt_level = level;
2087: sopt->sopt_name = name;
1.176 plunky 2088: (void)sockopt_alloc(sopt, size, KM_SLEEP);
1.171 plunky 2089: }
2090:
2091: /*
2092: * destroy sockopt storage
2093: * - will release any held memory references
2094: */
2095: void
2096: sockopt_destroy(struct sockopt *sopt)
2097: {
2098:
2099: if (sopt->sopt_data != sopt->sopt_buf)
1.173 plunky 2100: kmem_free(sopt->sopt_data, sopt->sopt_size);
1.171 plunky 2101:
2102: memset(sopt, 0, sizeof(*sopt));
2103: }
2104:
2105: /*
2106: * set sockopt value
2107: * - value is copied into sockopt
1.253 ryo 2108: * - memory is allocated when necessary, will not sleep
1.171 plunky 2109: */
2110: int
2111: sockopt_set(struct sockopt *sopt, const void *buf, size_t len)
2112: {
1.176 plunky 2113: int error;
1.171 plunky 2114:
1.176 plunky 2115: if (sopt->sopt_size == 0) {
2116: error = sockopt_alloc(sopt, len, KM_NOSLEEP);
2117: if (error)
2118: return error;
2119: }
1.171 plunky 2120:
1.255.2.1 martin 2121: if (sopt->sopt_size < len)
2122: return EINVAL;
2123:
1.171 plunky 2124: memcpy(sopt->sopt_data, buf, len);
1.255.2.1 martin 2125: sopt->sopt_retsize = len;
2126:
1.171 plunky 2127: return 0;
2128: }
2129:
2130: /*
2131: * common case of set sockopt integer value
2132: */
2133: int
2134: sockopt_setint(struct sockopt *sopt, int val)
2135: {
2136:
2137: return sockopt_set(sopt, &val, sizeof(int));
2138: }
2139:
2140: /*
2141: * get sockopt value
2142: * - correct size must be given
2143: */
2144: int
2145: sockopt_get(const struct sockopt *sopt, void *buf, size_t len)
2146: {
1.170 tls 2147:
1.171 plunky 2148: if (sopt->sopt_size != len)
2149: return EINVAL;
1.1 cgd 2150:
1.171 plunky 2151: memcpy(buf, sopt->sopt_data, len);
2152: return 0;
2153: }
1.1 cgd 2154:
1.171 plunky 2155: /*
2156: * common case of get sockopt integer value
2157: */
2158: int
2159: sockopt_getint(const struct sockopt *sopt, int *valp)
2160: {
1.1 cgd 2161:
1.171 plunky 2162: return sockopt_get(sopt, valp, sizeof(int));
2163: }
1.1 cgd 2164:
1.171 plunky 2165: /*
2166: * set sockopt value from mbuf
2167: * - ONLY for legacy code
2168: * - mbuf is released by sockopt
1.176 plunky 2169: * - will not sleep
1.171 plunky 2170: */
2171: int
2172: sockopt_setmbuf(struct sockopt *sopt, struct mbuf *m)
2173: {
2174: size_t len;
1.176 plunky 2175: int error;
1.1 cgd 2176:
1.171 plunky 2177: len = m_length(m);
1.1 cgd 2178:
1.176 plunky 2179: if (sopt->sopt_size == 0) {
2180: error = sockopt_alloc(sopt, len, KM_NOSLEEP);
2181: if (error)
2182: return error;
2183: }
1.1 cgd 2184:
1.255.2.1 martin 2185: if (sopt->sopt_size < len)
2186: return EINVAL;
2187:
1.171 plunky 2188: m_copydata(m, 0, len, sopt->sopt_data);
2189: m_freem(m);
1.255.2.1 martin 2190: sopt->sopt_retsize = len;
1.1 cgd 2191:
1.171 plunky 2192: return 0;
2193: }
1.1 cgd 2194:
1.171 plunky 2195: /*
2196: * get sockopt value into mbuf
2197: * - ONLY for legacy code
2198: * - mbuf to be released by the caller
1.176 plunky 2199: * - will not sleep
1.171 plunky 2200: */
2201: struct mbuf *
2202: sockopt_getmbuf(const struct sockopt *sopt)
2203: {
2204: struct mbuf *m;
1.107 darrenr 2205:
1.176 plunky 2206: if (sopt->sopt_size > MCLBYTES)
2207: return NULL;
2208:
2209: m = m_get(M_DONTWAIT, MT_SOOPTS);
1.171 plunky 2210: if (m == NULL)
2211: return NULL;
2212:
1.176 plunky 2213: if (sopt->sopt_size > MLEN) {
2214: MCLGET(m, M_DONTWAIT);
2215: if ((m->m_flags & M_EXT) == 0) {
2216: m_free(m);
2217: return NULL;
2218: }
1.1 cgd 2219: }
1.176 plunky 2220:
2221: memcpy(mtod(m, void *), sopt->sopt_data, sopt->sopt_size);
2222: m->m_len = sopt->sopt_size;
1.160 ad 2223:
1.171 plunky 2224: return m;
1.1 cgd 2225: }
2226:
1.14 mycroft 2227: void
1.54 lukem 2228: sohasoutofband(struct socket *so)
1.1 cgd 2229: {
1.153 rmind 2230:
1.90 christos 2231: fownsignal(so->so_pgid, SIGURG, POLL_PRI, POLLPRI|POLLRDBAND, so);
1.189 ad 2232: selnotify(&so->so_rcv.sb_sel, POLLPRI | POLLRDBAND, NOTE_SUBMIT);
1.1 cgd 2233: }
1.72 jdolecek 2234:
2235: static void
2236: filt_sordetach(struct knote *kn)
2237: {
2238: struct socket *so;
2239:
1.235 matt 2240: so = ((file_t *)kn->kn_obj)->f_socket;
1.160 ad 2241: solock(so);
1.73 christos 2242: SLIST_REMOVE(&so->so_rcv.sb_sel.sel_klist, kn, knote, kn_selnext);
2243: if (SLIST_EMPTY(&so->so_rcv.sb_sel.sel_klist))
1.72 jdolecek 2244: so->so_rcv.sb_flags &= ~SB_KNOTE;
1.160 ad 2245: sounlock(so);
1.72 jdolecek 2246: }
2247:
2248: /*ARGSUSED*/
2249: static int
1.129 yamt 2250: filt_soread(struct knote *kn, long hint)
1.72 jdolecek 2251: {
2252: struct socket *so;
1.160 ad 2253: int rv;
1.72 jdolecek 2254:
1.235 matt 2255: so = ((file_t *)kn->kn_obj)->f_socket;
1.160 ad 2256: if (hint != NOTE_SUBMIT)
2257: solock(so);
1.72 jdolecek 2258: kn->kn_data = so->so_rcv.sb_cc;
2259: if (so->so_state & SS_CANTRCVMORE) {
1.108 perry 2260: kn->kn_flags |= EV_EOF;
1.72 jdolecek 2261: kn->kn_fflags = so->so_error;
1.160 ad 2262: rv = 1;
1.255.2.3 martin 2263: } else if (so->so_error || so->so_rerror)
1.160 ad 2264: rv = 1;
2265: else if (kn->kn_sfflags & NOTE_LOWAT)
2266: rv = (kn->kn_data >= kn->kn_sdata);
1.253 ryo 2267: else
1.160 ad 2268: rv = (kn->kn_data >= so->so_rcv.sb_lowat);
2269: if (hint != NOTE_SUBMIT)
2270: sounlock(so);
2271: return rv;
1.72 jdolecek 2272: }
2273:
2274: static void
2275: filt_sowdetach(struct knote *kn)
2276: {
2277: struct socket *so;
2278:
1.235 matt 2279: so = ((file_t *)kn->kn_obj)->f_socket;
1.160 ad 2280: solock(so);
1.73 christos 2281: SLIST_REMOVE(&so->so_snd.sb_sel.sel_klist, kn, knote, kn_selnext);
2282: if (SLIST_EMPTY(&so->so_snd.sb_sel.sel_klist))
1.72 jdolecek 2283: so->so_snd.sb_flags &= ~SB_KNOTE;
1.160 ad 2284: sounlock(so);
1.72 jdolecek 2285: }
2286:
2287: /*ARGSUSED*/
2288: static int
1.129 yamt 2289: filt_sowrite(struct knote *kn, long hint)
1.72 jdolecek 2290: {
2291: struct socket *so;
1.160 ad 2292: int rv;
1.72 jdolecek 2293:
1.235 matt 2294: so = ((file_t *)kn->kn_obj)->f_socket;
1.160 ad 2295: if (hint != NOTE_SUBMIT)
2296: solock(so);
1.72 jdolecek 2297: kn->kn_data = sbspace(&so->so_snd);
2298: if (so->so_state & SS_CANTSENDMORE) {
1.108 perry 2299: kn->kn_flags |= EV_EOF;
1.72 jdolecek 2300: kn->kn_fflags = so->so_error;
1.160 ad 2301: rv = 1;
1.255.2.2 bouyer 2302: } else if (so->so_error)
1.160 ad 2303: rv = 1;
2304: else if (((so->so_state & SS_ISCONNECTED) == 0) &&
1.72 jdolecek 2305: (so->so_proto->pr_flags & PR_CONNREQUIRED))
1.160 ad 2306: rv = 0;
2307: else if (kn->kn_sfflags & NOTE_LOWAT)
2308: rv = (kn->kn_data >= kn->kn_sdata);
2309: else
2310: rv = (kn->kn_data >= so->so_snd.sb_lowat);
2311: if (hint != NOTE_SUBMIT)
2312: sounlock(so);
2313: return rv;
1.72 jdolecek 2314: }
2315:
2316: /*ARGSUSED*/
2317: static int
1.129 yamt 2318: filt_solisten(struct knote *kn, long hint)
1.72 jdolecek 2319: {
2320: struct socket *so;
1.160 ad 2321: int rv;
1.72 jdolecek 2322:
1.235 matt 2323: so = ((file_t *)kn->kn_obj)->f_socket;
1.72 jdolecek 2324:
2325: /*
2326: * Set kn_data to number of incoming connections, not
2327: * counting partial (incomplete) connections.
1.108 perry 2328: */
1.160 ad 2329: if (hint != NOTE_SUBMIT)
2330: solock(so);
1.72 jdolecek 2331: kn->kn_data = so->so_qlen;
1.160 ad 2332: rv = (kn->kn_data > 0);
2333: if (hint != NOTE_SUBMIT)
2334: sounlock(so);
2335: return rv;
1.72 jdolecek 2336: }
2337:
2338: static const struct filterops solisten_filtops =
2339: { 1, NULL, filt_sordetach, filt_solisten };
2340: static const struct filterops soread_filtops =
2341: { 1, NULL, filt_sordetach, filt_soread };
2342: static const struct filterops sowrite_filtops =
2343: { 1, NULL, filt_sowdetach, filt_sowrite };
2344:
2345: int
1.129 yamt 2346: soo_kqfilter(struct file *fp, struct knote *kn)
1.72 jdolecek 2347: {
2348: struct socket *so;
2349: struct sockbuf *sb;
2350:
1.235 matt 2351: so = ((file_t *)kn->kn_obj)->f_socket;
1.160 ad 2352: solock(so);
1.72 jdolecek 2353: switch (kn->kn_filter) {
2354: case EVFILT_READ:
2355: if (so->so_options & SO_ACCEPTCONN)
2356: kn->kn_fop = &solisten_filtops;
2357: else
2358: kn->kn_fop = &soread_filtops;
2359: sb = &so->so_rcv;
2360: break;
2361: case EVFILT_WRITE:
2362: kn->kn_fop = &sowrite_filtops;
2363: sb = &so->so_snd;
2364: break;
2365: default:
1.160 ad 2366: sounlock(so);
1.149 pooka 2367: return (EINVAL);
1.72 jdolecek 2368: }
1.73 christos 2369: SLIST_INSERT_HEAD(&sb->sb_sel.sel_klist, kn, kn_selnext);
1.72 jdolecek 2370: sb->sb_flags |= SB_KNOTE;
1.160 ad 2371: sounlock(so);
1.72 jdolecek 2372: return (0);
2373: }
2374:
1.154 ad 2375: static int
2376: sodopoll(struct socket *so, int events)
2377: {
2378: int revents;
2379:
2380: revents = 0;
2381:
2382: if (events & (POLLIN | POLLRDNORM))
2383: if (soreadable(so))
2384: revents |= events & (POLLIN | POLLRDNORM);
2385:
2386: if (events & (POLLOUT | POLLWRNORM))
2387: if (sowritable(so))
2388: revents |= events & (POLLOUT | POLLWRNORM);
2389:
2390: if (events & (POLLPRI | POLLRDBAND))
2391: if (so->so_oobmark || (so->so_state & SS_RCVATMARK))
2392: revents |= events & (POLLPRI | POLLRDBAND);
2393:
2394: return revents;
2395: }
2396:
2397: int
2398: sopoll(struct socket *so, int events)
2399: {
2400: int revents = 0;
2401:
1.160 ad 2402: #ifndef DIAGNOSTIC
2403: /*
2404: * Do a quick, unlocked check in expectation that the socket
2405: * will be ready for I/O. Don't do this check if DIAGNOSTIC,
2406: * as the solocked() assertions will fail.
2407: */
1.154 ad 2408: if ((revents = sodopoll(so, events)) != 0)
2409: return revents;
1.160 ad 2410: #endif
1.154 ad 2411:
1.160 ad 2412: solock(so);
1.154 ad 2413: if ((revents = sodopoll(so, events)) == 0) {
2414: if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
2415: selrecord(curlwp, &so->so_rcv.sb_sel);
1.160 ad 2416: so->so_rcv.sb_flags |= SB_NOTIFY;
1.154 ad 2417: }
2418:
2419: if (events & (POLLOUT | POLLWRNORM)) {
2420: selrecord(curlwp, &so->so_snd.sb_sel);
1.160 ad 2421: so->so_snd.sb_flags |= SB_NOTIFY;
1.154 ad 2422: }
2423: }
1.160 ad 2424: sounlock(so);
1.154 ad 2425:
2426: return revents;
2427: }
2428:
2429:
1.94 yamt 2430: #include <sys/sysctl.h>
2431:
2432: static int sysctl_kern_somaxkva(SYSCTLFN_PROTO);
1.212 pooka 2433: static int sysctl_kern_sbmax(SYSCTLFN_PROTO);
1.94 yamt 2434:
2435: /*
2436: * sysctl helper routine for kern.somaxkva. ensures that the given
2437: * value is not too small.
2438: * (XXX should we maybe make sure it's not too large as well?)
2439: */
2440: static int
2441: sysctl_kern_somaxkva(SYSCTLFN_ARGS)
2442: {
2443: int error, new_somaxkva;
2444: struct sysctlnode node;
2445:
2446: new_somaxkva = somaxkva;
2447: node = *rnode;
2448: node.sysctl_data = &new_somaxkva;
2449: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2450: if (error || newp == NULL)
2451: return (error);
2452:
2453: if (new_somaxkva < (16 * 1024 * 1024)) /* sanity */
2454: return (EINVAL);
2455:
1.136 ad 2456: mutex_enter(&so_pendfree_lock);
1.94 yamt 2457: somaxkva = new_somaxkva;
1.136 ad 2458: cv_broadcast(&socurkva_cv);
2459: mutex_exit(&so_pendfree_lock);
1.94 yamt 2460:
2461: return (error);
2462: }
2463:
1.212 pooka 2464: /*
2465: * sysctl helper routine for kern.sbmax. Basically just ensures that
2466: * any new value is not too small.
2467: */
2468: static int
2469: sysctl_kern_sbmax(SYSCTLFN_ARGS)
2470: {
2471: int error, new_sbmax;
2472: struct sysctlnode node;
2473:
2474: new_sbmax = sb_max;
2475: node = *rnode;
2476: node.sysctl_data = &new_sbmax;
2477: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2478: if (error || newp == NULL)
2479: return (error);
2480:
2481: KERNEL_LOCK(1, NULL);
2482: error = sb_max_set(new_sbmax);
2483: KERNEL_UNLOCK_ONE(NULL);
2484:
2485: return (error);
2486: }
2487:
1.178 pooka 2488: static void
1.212 pooka 2489: sysctl_kern_socket_setup(void)
1.94 yamt 2490: {
2491:
1.178 pooka 2492: KASSERT(socket_sysctllog == NULL);
1.97 atatat 2493:
1.178 pooka 2494: sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
1.97 atatat 2495: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.103 atatat 2496: CTLTYPE_INT, "somaxkva",
2497: SYSCTL_DESCR("Maximum amount of kernel memory to be "
2498: "used for socket buffers"),
1.94 yamt 2499: sysctl_kern_somaxkva, 0, NULL, 0,
2500: CTL_KERN, KERN_SOMAXKVA, CTL_EOL);
1.212 pooka 2501:
2502: sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
2503: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2504: CTLTYPE_INT, "sbmax",
2505: SYSCTL_DESCR("Maximum socket buffer size"),
2506: sysctl_kern_sbmax, 0, NULL, 0,
2507: CTL_KERN, KERN_SBMAX, CTL_EOL);
1.94 yamt 2508: }
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