Annotation of src/sys/kern/uipc_socket.c, Revision 1.252.6.1
1.252.6.1! pgoyette 1: /* $NetBSD: uipc_socket.c,v 1.253 2017/05/01 10:00:43 ryo 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>
1.252.6.1! pgoyette 74: __KERNEL_RCSID(0, "$NetBSD: uipc_socket.c,v 1.253 2017/05/01 10:00:43 ryo 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;
1.252.6.1! pgoyette 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. */
1.203 matt 438: if ((u_long)arg1 == PF_ROUTE || (u_long)arg1 == PF_OROUTE
439: || (u_long)arg1 == PF_BLUETOOTH) {
1.191 elad 440: result = KAUTH_RESULT_ALLOW;
1.203 matt 441: } else {
1.191 elad 442: /* Privileged, let secmodel handle this. */
443: if ((u_long)arg2 == SOCK_RAW)
444: break;
445: }
446:
447: result = KAUTH_RESULT_ALLOW;
448:
449: break;
450:
1.192 elad 451: case KAUTH_REQ_NETWORK_SOCKET_CANSEE:
452: result = KAUTH_RESULT_ALLOW;
453:
454: break;
455:
1.191 elad 456: default:
457: break;
458: }
459:
460: return result;
461: }
462:
1.119 yamt 463: void
464: soinit(void)
465: {
466:
1.212 pooka 467: sysctl_kern_socket_setup();
1.178 pooka 468:
1.148 ad 469: mutex_init(&so_pendfree_lock, MUTEX_DEFAULT, IPL_VM);
1.160 ad 470: softnet_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
1.136 ad 471: cv_init(&socurkva_cv, "sokva");
1.205 bouyer 472: cv_init(&pendfree_thread_cv, "sopendfr");
1.166 ad 473: soinit2();
1.136 ad 474:
1.119 yamt 475: /* Set the initial adjusted socket buffer size. */
476: if (sb_max_set(sb_max))
477: panic("bad initial sb_max value: %lu", sb_max);
478:
1.191 elad 479: socket_listener = kauth_listen_scope(KAUTH_SCOPE_NETWORK,
480: socket_listener_cb, NULL);
1.119 yamt 481: }
482:
1.205 bouyer 483: void
484: soinit1(void)
485: {
486: int error = kthread_create(PRI_NONE, KTHREAD_MPSAFE, NULL,
487: sopendfree_thread, NULL, &sopendfree_lwp, "sopendfree");
488: if (error)
489: panic("soinit1 %d", error);
490: }
491:
1.1 cgd 492: /*
1.222 rmind 493: * socreate: create a new socket of the specified type and the protocol.
494: *
495: * => Caller may specify another socket for lock sharing (must not be held).
496: * => Returns the new socket without lock held.
1.224 rmind 497: */
1.3 andrew 498: int
1.160 ad 499: socreate(int dom, struct socket **aso, int type, int proto, struct lwp *l,
500: struct socket *lockso)
1.1 cgd 501: {
1.99 matt 502: const struct protosw *prp;
1.54 lukem 503: struct socket *so;
1.115 yamt 504: uid_t uid;
1.160 ad 505: int error;
506: kmutex_t *lock;
1.1 cgd 507:
1.132 elad 508: error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_SOCKET,
509: KAUTH_REQ_NETWORK_SOCKET_OPEN, KAUTH_ARG(dom), KAUTH_ARG(type),
510: KAUTH_ARG(proto));
1.140 dyoung 511: if (error != 0)
512: return error;
1.127 elad 513:
1.1 cgd 514: if (proto)
515: prp = pffindproto(dom, proto, type);
516: else
517: prp = pffindtype(dom, type);
1.140 dyoung 518: if (prp == NULL) {
1.120 ginsbach 519: /* no support for domain */
520: if (pffinddomain(dom) == 0)
1.140 dyoung 521: return EAFNOSUPPORT;
1.120 ginsbach 522: /* no support for socket type */
523: if (proto == 0 && type != 0)
1.140 dyoung 524: return EPROTOTYPE;
525: return EPROTONOSUPPORT;
1.120 ginsbach 526: }
1.223 rmind 527: if (prp->pr_usrreqs == NULL)
1.140 dyoung 528: return EPROTONOSUPPORT;
1.1 cgd 529: if (prp->pr_type != type)
1.140 dyoung 530: return EPROTOTYPE;
1.160 ad 531:
532: so = soget(true);
1.1 cgd 533: so->so_type = type;
534: so->so_proto = prp;
1.33 matt 535: so->so_send = sosend;
536: so->so_receive = soreceive;
1.78 matt 537: #ifdef MBUFTRACE
538: so->so_rcv.sb_mowner = &prp->pr_domain->dom_mowner;
539: so->so_snd.sb_mowner = &prp->pr_domain->dom_mowner;
540: so->so_mowner = &prp->pr_domain->dom_mowner;
541: #endif
1.138 rmind 542: uid = kauth_cred_geteuid(l->l_cred);
1.115 yamt 543: so->so_uidinfo = uid_find(uid);
1.168 yamt 544: so->so_cpid = l->l_proc->p_pid;
1.224 rmind 545:
546: /*
547: * Lock assigned and taken during PCB attach, unless we share
548: * the lock with another socket, e.g. socketpair(2) case.
549: */
550: if (lockso) {
1.160 ad 551: lock = lockso->so_lock;
552: so->so_lock = lock;
553: mutex_obj_hold(lock);
554: mutex_enter(lock);
555: }
1.224 rmind 556:
557: /* Attach the PCB (returns with the socket lock held). */
558: error = (*prp->pr_usrreqs->pr_attach)(so, proto);
1.160 ad 559: KASSERT(solocked(so));
1.224 rmind 560:
561: if (error) {
1.222 rmind 562: KASSERT(so->so_pcb == NULL);
1.1 cgd 563: so->so_state |= SS_NOFDREF;
564: sofree(so);
1.140 dyoung 565: return error;
1.1 cgd 566: }
1.198 elad 567: so->so_cred = kauth_cred_dup(l->l_cred);
1.160 ad 568: sounlock(so);
1.224 rmind 569:
1.1 cgd 570: *aso = so;
1.140 dyoung 571: return 0;
1.1 cgd 572: }
573:
1.222 rmind 574: /*
575: * fsocreate: create a socket and a file descriptor associated with it.
576: *
577: * => On success, write file descriptor to fdout and return zero.
578: * => On failure, return non-zero; *fdout will be undefined.
1.142 dyoung 579: */
580: int
1.222 rmind 581: fsocreate(int domain, struct socket **sop, int type, int proto, int *fdout)
1.142 dyoung 582: {
1.222 rmind 583: lwp_t *l = curlwp;
584: int error, fd, flags;
585: struct socket *so;
586: struct file *fp;
1.142 dyoung 587:
1.222 rmind 588: if ((error = fd_allocfile(&fp, &fd)) != 0) {
1.204 christos 589: return error;
1.222 rmind 590: }
591: flags = type & SOCK_FLAGS_MASK;
1.204 christos 592: fd_set_exclose(l, fd, (flags & SOCK_CLOEXEC) != 0);
1.207 christos 593: fp->f_flag = FREAD|FWRITE|((flags & SOCK_NONBLOCK) ? FNONBLOCK : 0)|
594: ((flags & SOCK_NOSIGPIPE) ? FNOSIGPIPE : 0);
1.142 dyoung 595: fp->f_type = DTYPE_SOCKET;
596: fp->f_ops = &socketops;
1.222 rmind 597:
598: type &= ~SOCK_FLAGS_MASK;
599: error = socreate(domain, &so, type, proto, l, NULL);
600: if (error) {
1.155 ad 601: fd_abort(curproc, fp, fd);
1.222 rmind 602: return error;
603: }
604: if (flags & SOCK_NONBLOCK) {
605: so->so_state |= SS_NBIO;
606: }
1.235 matt 607: fp->f_socket = so;
1.222 rmind 608: fd_affix(curproc, fp, fd);
609:
610: if (sop != NULL) {
611: *sop = so;
1.142 dyoung 612: }
1.222 rmind 613: *fdout = fd;
1.142 dyoung 614: return error;
615: }
616:
1.3 andrew 617: int
1.190 dyoung 618: sofamily(const struct socket *so)
619: {
620: const struct protosw *pr;
621: const struct domain *dom;
622:
623: if ((pr = so->so_proto) == NULL)
624: return AF_UNSPEC;
625: if ((dom = pr->pr_domain) == NULL)
626: return AF_UNSPEC;
627: return dom->dom_family;
628: }
629:
630: int
1.236 rtr 631: sobind(struct socket *so, struct sockaddr *nam, struct lwp *l)
1.1 cgd 632: {
1.160 ad 633: int error;
1.1 cgd 634:
1.160 ad 635: solock(so);
1.237 rtr 636: if (nam->sa_family != so->so_proto->pr_domain->dom_family) {
637: sounlock(so);
1.238 rtr 638: return EAFNOSUPPORT;
1.237 rtr 639: }
1.231 rtr 640: error = (*so->so_proto->pr_usrreqs->pr_bind)(so, nam, l);
1.160 ad 641: sounlock(so);
1.140 dyoung 642: return error;
1.1 cgd 643: }
644:
1.3 andrew 645: int
1.150 elad 646: solisten(struct socket *so, int backlog, struct lwp *l)
1.1 cgd 647: {
1.160 ad 648: int error;
1.247 rjs 649: short oldopt, oldqlimit;
1.1 cgd 650:
1.160 ad 651: solock(so);
1.252.6.1! pgoyette 652: if ((so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING |
1.163 ad 653: SS_ISDISCONNECTING)) != 0) {
1.222 rmind 654: sounlock(so);
655: return EINVAL;
1.163 ad 656: }
1.247 rjs 657: oldopt = so->so_options;
658: oldqlimit = so->so_qlimit;
659: if (TAILQ_EMPTY(&so->so_q))
660: so->so_options |= SO_ACCEPTCONN;
661: if (backlog < 0)
662: backlog = 0;
663: so->so_qlimit = min(backlog, somaxconn);
664:
1.231 rtr 665: error = (*so->so_proto->pr_usrreqs->pr_listen)(so, l);
1.140 dyoung 666: if (error != 0) {
1.247 rjs 667: so->so_options = oldopt;
668: so->so_qlimit = oldqlimit;
1.160 ad 669: sounlock(so);
1.140 dyoung 670: return error;
1.1 cgd 671: }
1.160 ad 672: sounlock(so);
1.140 dyoung 673: return 0;
1.1 cgd 674: }
675:
1.21 christos 676: void
1.54 lukem 677: sofree(struct socket *so)
1.1 cgd 678: {
1.161 ad 679: u_int refs;
1.1 cgd 680:
1.160 ad 681: KASSERT(solocked(so));
682:
683: if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0) {
684: sounlock(so);
1.1 cgd 685: return;
1.160 ad 686: }
1.43 mycroft 687: if (so->so_head) {
688: /*
689: * We must not decommission a socket that's on the accept(2)
690: * queue. If we do, then accept(2) may hang after select(2)
691: * indicated that the listening socket was ready.
692: */
1.160 ad 693: if (!soqremque(so, 0)) {
694: sounlock(so);
1.43 mycroft 695: return;
1.160 ad 696: }
1.43 mycroft 697: }
1.98 christos 698: if (so->so_rcv.sb_hiwat)
1.110 christos 699: (void)chgsbsize(so->so_uidinfo, &so->so_rcv.sb_hiwat, 0,
1.98 christos 700: RLIM_INFINITY);
701: if (so->so_snd.sb_hiwat)
1.110 christos 702: (void)chgsbsize(so->so_uidinfo, &so->so_snd.sb_hiwat, 0,
1.98 christos 703: RLIM_INFINITY);
704: sbrelease(&so->so_snd, so);
1.160 ad 705: KASSERT(!cv_has_waiters(&so->so_cv));
706: KASSERT(!cv_has_waiters(&so->so_rcv.sb_cv));
707: KASSERT(!cv_has_waiters(&so->so_snd.sb_cv));
1.1 cgd 708: sorflush(so);
1.161 ad 709: refs = so->so_aborting; /* XXX */
1.177 ad 710: /* Remove acccept filter if one is present. */
1.170 tls 711: if (so->so_accf != NULL)
1.177 ad 712: (void)accept_filt_clear(so);
1.160 ad 713: sounlock(so);
1.161 ad 714: if (refs == 0) /* XXX */
715: soput(so);
1.1 cgd 716: }
717:
718: /*
1.222 rmind 719: * soclose: close a socket on last file table reference removal.
720: * Initiate disconnect if connected. Free socket when disconnect complete.
1.1 cgd 721: */
1.3 andrew 722: int
1.54 lukem 723: soclose(struct socket *so)
1.1 cgd 724: {
1.222 rmind 725: struct socket *so2;
726: int error = 0;
1.1 cgd 727:
1.160 ad 728: solock(so);
1.1 cgd 729: if (so->so_options & SO_ACCEPTCONN) {
1.172 ad 730: for (;;) {
731: if ((so2 = TAILQ_FIRST(&so->so_q0)) != 0) {
1.160 ad 732: KASSERT(solocked2(so, so2));
733: (void) soqremque(so2, 0);
734: /* soabort drops the lock. */
735: (void) soabort(so2);
736: solock(so);
1.172 ad 737: continue;
1.160 ad 738: }
1.172 ad 739: if ((so2 = TAILQ_FIRST(&so->so_q)) != 0) {
1.160 ad 740: KASSERT(solocked2(so, so2));
741: (void) soqremque(so2, 1);
742: /* soabort drops the lock. */
743: (void) soabort(so2);
744: solock(so);
1.172 ad 745: continue;
1.160 ad 746: }
1.172 ad 747: break;
748: }
1.1 cgd 749: }
1.222 rmind 750: if (so->so_pcb == NULL)
1.1 cgd 751: goto discard;
752: if (so->so_state & SS_ISCONNECTED) {
753: if ((so->so_state & SS_ISDISCONNECTING) == 0) {
754: error = sodisconnect(so);
755: if (error)
756: goto drop;
757: }
758: if (so->so_options & SO_LINGER) {
1.206 christos 759: if ((so->so_state & (SS_ISDISCONNECTING|SS_NBIO)) ==
760: (SS_ISDISCONNECTING|SS_NBIO))
1.1 cgd 761: goto drop;
1.21 christos 762: while (so->so_state & SS_ISCONNECTED) {
1.185 yamt 763: error = sowait(so, true, so->so_linger * hz);
1.21 christos 764: if (error)
1.1 cgd 765: break;
1.21 christos 766: }
1.1 cgd 767: }
768: }
1.54 lukem 769: drop:
1.1 cgd 770: if (so->so_pcb) {
1.224 rmind 771: KASSERT(solocked(so));
772: (*so->so_proto->pr_usrreqs->pr_detach)(so);
1.1 cgd 773: }
1.54 lukem 774: discard:
1.222 rmind 775: KASSERT((so->so_state & SS_NOFDREF) == 0);
1.198 elad 776: kauth_cred_free(so->so_cred);
1.1 cgd 777: so->so_state |= SS_NOFDREF;
778: sofree(so);
1.222 rmind 779: return error;
1.1 cgd 780: }
781:
782: /*
1.160 ad 783: * Must be called with the socket locked.. Will return with it unlocked.
1.1 cgd 784: */
1.3 andrew 785: int
1.54 lukem 786: soabort(struct socket *so)
1.1 cgd 787: {
1.161 ad 788: u_int refs;
1.139 yamt 789: int error;
1.252.6.1! pgoyette 790:
1.160 ad 791: KASSERT(solocked(so));
792: KASSERT(so->so_head == NULL);
1.1 cgd 793:
1.161 ad 794: so->so_aborting++; /* XXX */
1.230 mrg 795: error = (*so->so_proto->pr_usrreqs->pr_abort)(so);
1.161 ad 796: refs = --so->so_aborting; /* XXX */
1.164 drochner 797: if (error || (refs == 0)) {
1.139 yamt 798: sofree(so);
1.160 ad 799: } else {
800: sounlock(so);
1.139 yamt 801: }
802: return error;
1.1 cgd 803: }
804:
1.3 andrew 805: int
1.239 rtr 806: soaccept(struct socket *so, struct sockaddr *nam)
1.1 cgd 807: {
1.222 rmind 808: int error;
1.160 ad 809:
810: KASSERT(solocked(so));
1.222 rmind 811: KASSERT((so->so_state & SS_NOFDREF) != 0);
1.1 cgd 812:
813: so->so_state &= ~SS_NOFDREF;
1.55 thorpej 814: if ((so->so_state & SS_ISDISCONNECTED) == 0 ||
815: (so->so_proto->pr_flags & PR_ABRTACPTDIS) == 0)
1.225 rtr 816: error = (*so->so_proto->pr_usrreqs->pr_accept)(so, nam);
1.41 mycroft 817: else
1.53 itojun 818: error = ECONNABORTED;
1.52 itojun 819:
1.222 rmind 820: return error;
1.1 cgd 821: }
822:
1.3 andrew 823: int
1.240 rtr 824: soconnect(struct socket *so, struct sockaddr *nam, struct lwp *l)
1.1 cgd 825: {
1.222 rmind 826: int error;
1.160 ad 827:
828: KASSERT(solocked(so));
1.1 cgd 829:
830: if (so->so_options & SO_ACCEPTCONN)
1.222 rmind 831: return EOPNOTSUPP;
1.1 cgd 832: /*
833: * If protocol is connection-based, can only connect once.
834: * Otherwise, if connected, try to disconnect first.
835: * This allows user to disconnect by connecting to, e.g.,
836: * a null address.
837: */
838: if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
839: ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
1.241 rtr 840: (error = sodisconnect(so)))) {
1.1 cgd 841: error = EISCONN;
1.241 rtr 842: } else {
1.242 rtr 843: if (nam->sa_family != so->so_proto->pr_domain->dom_family) {
1.241 rtr 844: return EAFNOSUPPORT;
845: }
1.231 rtr 846: error = (*so->so_proto->pr_usrreqs->pr_connect)(so, nam, l);
1.241 rtr 847: }
1.222 rmind 848:
849: return error;
1.1 cgd 850: }
851:
1.3 andrew 852: int
1.54 lukem 853: soconnect2(struct socket *so1, struct socket *so2)
1.1 cgd 854: {
1.160 ad 855: KASSERT(solocked2(so1, so2));
1.1 cgd 856:
1.234 rtr 857: return (*so1->so_proto->pr_usrreqs->pr_connect2)(so1, so2);
1.1 cgd 858: }
859:
1.3 andrew 860: int
1.54 lukem 861: sodisconnect(struct socket *so)
1.1 cgd 862: {
1.160 ad 863: int error;
864:
865: KASSERT(solocked(so));
1.1 cgd 866:
867: if ((so->so_state & SS_ISCONNECTED) == 0) {
868: error = ENOTCONN;
1.160 ad 869: } else if (so->so_state & SS_ISDISCONNECTING) {
1.1 cgd 870: error = EALREADY;
1.160 ad 871: } else {
1.229 rtr 872: error = (*so->so_proto->pr_usrreqs->pr_disconnect)(so);
1.1 cgd 873: }
874: return (error);
875: }
876:
1.15 mycroft 877: #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK)
1.1 cgd 878: /*
879: * Send on a socket.
880: * If send must go all at once and message is larger than
881: * send buffering, then hard error.
882: * Lock against other senders.
883: * If must go all at once and not enough room now, then
884: * inform user that this would block and do nothing.
885: * Otherwise, if nonblocking, send as much as possible.
886: * The data to be sent is described by "uio" if nonzero,
887: * otherwise by the mbuf chain "top" (which must be null
888: * if uio is not). Data provided in mbuf chain must be small
889: * enough to send all at once.
890: *
891: * Returns nonzero on error, timeout or signal; callers
892: * must check for short counts if EINTR/ERESTART are returned.
893: * Data and control buffers are freed on return.
894: */
1.3 andrew 895: int
1.245 rtr 896: sosend(struct socket *so, struct sockaddr *addr, struct uio *uio,
897: struct mbuf *top, struct mbuf *control, int flags, struct lwp *l)
1.1 cgd 898: {
1.54 lukem 899: struct mbuf **mp, *m;
1.58 jdolecek 900: long space, len, resid, clen, mlen;
901: int error, s, dontroute, atomic;
1.196 dsl 902: short wakeup_state = 0;
1.54 lukem 903:
1.160 ad 904: clen = 0;
1.64 thorpej 905:
1.160 ad 906: /*
907: * solock() provides atomicity of access. splsoftnet() prevents
908: * protocol processing soft interrupts from interrupting us and
909: * blocking (expensive).
910: */
911: s = splsoftnet();
912: solock(so);
1.54 lukem 913: atomic = sosendallatonce(so) || top;
1.1 cgd 914: if (uio)
915: resid = uio->uio_resid;
916: else
917: resid = top->m_pkthdr.len;
1.7 cgd 918: /*
919: * In theory resid should be unsigned.
920: * However, space must be signed, as it might be less than 0
921: * if we over-committed, and we must use a signed comparison
922: * of space and resid. On the other hand, a negative resid
923: * causes us to loop sending 0-length segments to the protocol.
924: */
1.29 mycroft 925: if (resid < 0) {
926: error = EINVAL;
927: goto out;
928: }
1.1 cgd 929: dontroute =
930: (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
931: (so->so_proto->pr_flags & PR_ATOMIC);
1.165 christos 932: l->l_ru.ru_msgsnd++;
1.1 cgd 933: if (control)
934: clen = control->m_len;
1.54 lukem 935: restart:
1.21 christos 936: if ((error = sblock(&so->so_snd, SBLOCKWAIT(flags))) != 0)
1.1 cgd 937: goto out;
938: do {
1.160 ad 939: if (so->so_state & SS_CANTSENDMORE) {
940: error = EPIPE;
941: goto release;
942: }
1.48 thorpej 943: if (so->so_error) {
944: error = so->so_error;
945: so->so_error = 0;
946: goto release;
947: }
1.1 cgd 948: if ((so->so_state & SS_ISCONNECTED) == 0) {
949: if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
1.217 rmind 950: if (resid || clen == 0) {
1.160 ad 951: error = ENOTCONN;
952: goto release;
953: }
1.244 rtr 954: } else if (addr == NULL) {
1.160 ad 955: error = EDESTADDRREQ;
956: goto release;
957: }
1.1 cgd 958: }
959: space = sbspace(&so->so_snd);
960: if (flags & MSG_OOB)
961: space += 1024;
1.21 christos 962: if ((atomic && resid > so->so_snd.sb_hiwat) ||
1.160 ad 963: clen > so->so_snd.sb_hiwat) {
964: error = EMSGSIZE;
965: goto release;
966: }
1.96 mycroft 967: if (space < resid + clen &&
1.1 cgd 968: (atomic || space < so->so_snd.sb_lowat || space < clen)) {
1.206 christos 969: if ((so->so_state & SS_NBIO) || (flags & MSG_NBIO)) {
1.160 ad 970: error = EWOULDBLOCK;
971: goto release;
972: }
1.1 cgd 973: sbunlock(&so->so_snd);
1.196 dsl 974: if (wakeup_state & SS_RESTARTSYS) {
975: error = ERESTART;
976: goto out;
977: }
1.1 cgd 978: error = sbwait(&so->so_snd);
979: if (error)
980: goto out;
1.196 dsl 981: wakeup_state = so->so_state;
1.1 cgd 982: goto restart;
983: }
1.196 dsl 984: wakeup_state = 0;
1.1 cgd 985: mp = ⊤
986: space -= clen;
987: do {
1.45 tv 988: if (uio == NULL) {
989: /*
990: * Data is prepackaged in "top".
991: */
992: resid = 0;
993: if (flags & MSG_EOR)
994: top->m_flags |= M_EOR;
995: } else do {
1.160 ad 996: sounlock(so);
997: splx(s);
1.144 dyoung 998: if (top == NULL) {
1.78 matt 999: m = m_gethdr(M_WAIT, MT_DATA);
1.45 tv 1000: mlen = MHLEN;
1001: m->m_pkthdr.len = 0;
1.248 ozaki-r 1002: m_reset_rcvif(m);
1.45 tv 1003: } else {
1.78 matt 1004: m = m_get(M_WAIT, MT_DATA);
1.45 tv 1005: mlen = MLEN;
1006: }
1.78 matt 1007: MCLAIM(m, so->so_snd.sb_mowner);
1.121 yamt 1008: if (sock_loan_thresh >= 0 &&
1009: uio->uio_iov->iov_len >= sock_loan_thresh &&
1010: space >= sock_loan_thresh &&
1.64 thorpej 1011: (len = sosend_loan(so, uio, m,
1.252 uwe 1012: space)) != 0) {
1.64 thorpej 1013: SOSEND_COUNTER_INCR(&sosend_loan_big);
1014: space -= len;
1015: goto have_data;
1016: }
1.45 tv 1017: if (resid >= MINCLSIZE && space >= MCLBYTES) {
1.64 thorpej 1018: SOSEND_COUNTER_INCR(&sosend_copy_big);
1.201 oki 1019: m_clget(m, M_DONTWAIT);
1.45 tv 1020: if ((m->m_flags & M_EXT) == 0)
1021: goto nopages;
1022: mlen = MCLBYTES;
1023: if (atomic && top == 0) {
1.58 jdolecek 1024: len = lmin(MCLBYTES - max_hdr,
1.54 lukem 1025: resid);
1.45 tv 1026: m->m_data += max_hdr;
1027: } else
1.58 jdolecek 1028: len = lmin(MCLBYTES, resid);
1.45 tv 1029: space -= len;
1030: } else {
1.64 thorpej 1031: nopages:
1032: SOSEND_COUNTER_INCR(&sosend_copy_small);
1.58 jdolecek 1033: len = lmin(lmin(mlen, resid), space);
1.45 tv 1034: space -= len;
1035: /*
1036: * For datagram protocols, leave room
1037: * for protocol headers in first mbuf.
1038: */
1039: if (atomic && top == 0 && len < mlen)
1040: MH_ALIGN(m, len);
1041: }
1.144 dyoung 1042: error = uiomove(mtod(m, void *), (int)len, uio);
1.64 thorpej 1043: have_data:
1.45 tv 1044: resid = uio->uio_resid;
1045: m->m_len = len;
1046: *mp = m;
1047: top->m_pkthdr.len += len;
1.160 ad 1048: s = splsoftnet();
1049: solock(so);
1.144 dyoung 1050: if (error != 0)
1.45 tv 1051: goto release;
1052: mp = &m->m_next;
1053: if (resid <= 0) {
1054: if (flags & MSG_EOR)
1055: top->m_flags |= M_EOR;
1056: break;
1057: }
1058: } while (space > 0 && atomic);
1.108 perry 1059:
1.160 ad 1060: if (so->so_state & SS_CANTSENDMORE) {
1061: error = EPIPE;
1062: goto release;
1063: }
1.45 tv 1064: if (dontroute)
1065: so->so_options |= SO_DONTROUTE;
1066: if (resid > 0)
1067: so->so_state |= SS_MORETOCOME;
1.240 rtr 1068: if (flags & MSG_OOB) {
1.252.6.1! pgoyette 1069: error = (*so->so_proto->pr_usrreqs->pr_sendoob)(
! 1070: so, top, control);
1.240 rtr 1071: } else {
1.232 rtr 1072: error = (*so->so_proto->pr_usrreqs->pr_send)(so,
1.245 rtr 1073: top, addr, control, l);
1.240 rtr 1074: }
1.45 tv 1075: if (dontroute)
1076: so->so_options &= ~SO_DONTROUTE;
1077: if (resid > 0)
1078: so->so_state &= ~SS_MORETOCOME;
1079: clen = 0;
1.144 dyoung 1080: control = NULL;
1081: top = NULL;
1.45 tv 1082: mp = ⊤
1.144 dyoung 1083: if (error != 0)
1.1 cgd 1084: goto release;
1085: } while (resid && space > 0);
1086: } while (resid);
1087:
1.54 lukem 1088: release:
1.1 cgd 1089: sbunlock(&so->so_snd);
1.54 lukem 1090: out:
1.160 ad 1091: sounlock(so);
1092: splx(s);
1.1 cgd 1093: if (top)
1094: m_freem(top);
1095: if (control)
1096: m_freem(control);
1097: return (error);
1098: }
1099:
1100: /*
1.159 ad 1101: * Following replacement or removal of the first mbuf on the first
1102: * mbuf chain of a socket buffer, push necessary state changes back
1103: * into the socket buffer so that other consumers see the values
1104: * consistently. 'nextrecord' is the callers locally stored value of
1105: * the original value of sb->sb_mb->m_nextpkt which must be restored
1106: * when the lead mbuf changes. NOTE: 'nextrecord' may be NULL.
1107: */
1108: static void
1109: sbsync(struct sockbuf *sb, struct mbuf *nextrecord)
1110: {
1111:
1.160 ad 1112: KASSERT(solocked(sb->sb_so));
1113:
1.159 ad 1114: /*
1115: * First, update for the new value of nextrecord. If necessary,
1116: * make it the first record.
1117: */
1118: if (sb->sb_mb != NULL)
1119: sb->sb_mb->m_nextpkt = nextrecord;
1120: else
1121: sb->sb_mb = nextrecord;
1122:
1123: /*
1124: * Now update any dependent socket buffer fields to reflect
1125: * the new state. This is an inline of SB_EMPTY_FIXUP, with
1126: * the addition of a second clause that takes care of the
1127: * case where sb_mb has been updated, but remains the last
1128: * record.
1129: */
1130: if (sb->sb_mb == NULL) {
1131: sb->sb_mbtail = NULL;
1132: sb->sb_lastrecord = NULL;
1133: } else if (sb->sb_mb->m_nextpkt == NULL)
1134: sb->sb_lastrecord = sb->sb_mb;
1135: }
1136:
1137: /*
1.1 cgd 1138: * Implement receive operations on a socket.
1139: * We depend on the way that records are added to the sockbuf
1140: * by sbappend*. In particular, each record (mbufs linked through m_next)
1141: * must begin with an address if the protocol so specifies,
1142: * followed by an optional mbuf or mbufs containing ancillary data,
1143: * and then zero or more mbufs of data.
1144: * In order to avoid blocking network interrupts for the entire time here,
1145: * we splx() while doing the actual copy to user space.
1146: * Although the sockbuf is locked, new data may still be appended,
1147: * and thus we must maintain consistency of the sockbuf during that time.
1148: *
1149: * The caller may receive the data as a single mbuf chain by supplying
1150: * an mbuf **mp0 for use in returning the chain. The uio is then used
1151: * only for the count in uio_resid.
1152: */
1.3 andrew 1153: int
1.54 lukem 1154: soreceive(struct socket *so, struct mbuf **paddr, struct uio *uio,
1155: struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
1.1 cgd 1156: {
1.116 yamt 1157: struct lwp *l = curlwp;
1.160 ad 1158: struct mbuf *m, **mp, *mt;
1.211 chs 1159: size_t len, offset, moff, orig_resid;
1160: int atomic, flags, error, s, type;
1.99 matt 1161: const struct protosw *pr;
1.54 lukem 1162: struct mbuf *nextrecord;
1.67 he 1163: int mbuf_removed = 0;
1.146 dyoung 1164: const struct domain *dom;
1.196 dsl 1165: short wakeup_state = 0;
1.64 thorpej 1166:
1.54 lukem 1167: pr = so->so_proto;
1.146 dyoung 1168: atomic = pr->pr_flags & PR_ATOMIC;
1169: dom = pr->pr_domain;
1.1 cgd 1170: mp = mp0;
1.54 lukem 1171: type = 0;
1172: orig_resid = uio->uio_resid;
1.102 jonathan 1173:
1.144 dyoung 1174: if (paddr != NULL)
1175: *paddr = NULL;
1176: if (controlp != NULL)
1177: *controlp = NULL;
1178: if (flagsp != NULL)
1.252 uwe 1179: flags = *flagsp &~ MSG_EOR;
1.1 cgd 1180: else
1181: flags = 0;
1.66 enami 1182:
1.1 cgd 1183: if (flags & MSG_OOB) {
1184: m = m_get(M_WAIT, MT_DATA);
1.160 ad 1185: solock(so);
1.226 rtr 1186: error = (*pr->pr_usrreqs->pr_recvoob)(so, m, flags & MSG_PEEK);
1.160 ad 1187: sounlock(so);
1.1 cgd 1188: if (error)
1189: goto bad;
1190: do {
1.134 christos 1191: error = uiomove(mtod(m, void *),
1.211 chs 1192: MIN(uio->uio_resid, m->m_len), uio);
1.1 cgd 1193: m = m_free(m);
1.144 dyoung 1194: } while (uio->uio_resid > 0 && error == 0 && m);
1.54 lukem 1195: bad:
1.144 dyoung 1196: if (m != NULL)
1.1 cgd 1197: m_freem(m);
1.144 dyoung 1198: return error;
1.1 cgd 1199: }
1.144 dyoung 1200: if (mp != NULL)
1.140 dyoung 1201: *mp = NULL;
1.160 ad 1202:
1203: /*
1204: * solock() provides atomicity of access. splsoftnet() prevents
1205: * protocol processing soft interrupts from interrupting us and
1206: * blocking (expensive).
1207: */
1208: s = splsoftnet();
1209: solock(so);
1.54 lukem 1210: restart:
1.160 ad 1211: if ((error = sblock(&so->so_rcv, SBLOCKWAIT(flags))) != 0) {
1212: sounlock(so);
1213: splx(s);
1.144 dyoung 1214: return error;
1.160 ad 1215: }
1.1 cgd 1216:
1217: m = so->so_rcv.sb_mb;
1218: /*
1219: * If we have less data than requested, block awaiting more
1220: * (subject to any timeout) if:
1.15 mycroft 1221: * 1. the current count is less than the low water mark,
1.1 cgd 1222: * 2. MSG_WAITALL is set, and it is possible to do the entire
1.15 mycroft 1223: * receive operation at once if we block (resid <= hiwat), or
1224: * 3. MSG_DONTWAIT is not set.
1.1 cgd 1225: * If MSG_WAITALL is set but resid is larger than the receive buffer,
1226: * we have to do the receive in sections, and thus risk returning
1227: * a short count if a timeout or signal occurs after we start.
1228: */
1.144 dyoung 1229: if (m == NULL ||
1230: ((flags & MSG_DONTWAIT) == 0 &&
1231: so->so_rcv.sb_cc < uio->uio_resid &&
1232: (so->so_rcv.sb_cc < so->so_rcv.sb_lowat ||
1233: ((flags & MSG_WAITALL) &&
1234: uio->uio_resid <= so->so_rcv.sb_hiwat)) &&
1.146 dyoung 1235: m->m_nextpkt == NULL && !atomic)) {
1.1 cgd 1236: #ifdef DIAGNOSTIC
1.144 dyoung 1237: if (m == NULL && so->so_rcv.sb_cc)
1.1 cgd 1238: panic("receive 1");
1239: #endif
1240: if (so->so_error) {
1.144 dyoung 1241: if (m != NULL)
1.15 mycroft 1242: goto dontblock;
1.1 cgd 1243: error = so->so_error;
1244: if ((flags & MSG_PEEK) == 0)
1245: so->so_error = 0;
1246: goto release;
1247: }
1248: if (so->so_state & SS_CANTRCVMORE) {
1.144 dyoung 1249: if (m != NULL)
1.15 mycroft 1250: goto dontblock;
1.1 cgd 1251: else
1252: goto release;
1253: }
1.144 dyoung 1254: for (; m != NULL; m = m->m_next)
1.1 cgd 1255: if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) {
1256: m = so->so_rcv.sb_mb;
1257: goto dontblock;
1258: }
1259: if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
1260: (so->so_proto->pr_flags & PR_CONNREQUIRED)) {
1261: error = ENOTCONN;
1262: goto release;
1263: }
1264: if (uio->uio_resid == 0)
1265: goto release;
1.206 christos 1266: if ((so->so_state & SS_NBIO) ||
1267: (flags & (MSG_DONTWAIT|MSG_NBIO))) {
1.1 cgd 1268: error = EWOULDBLOCK;
1269: goto release;
1270: }
1.69 thorpej 1271: SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 1");
1272: SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 1");
1.1 cgd 1273: sbunlock(&so->so_rcv);
1.196 dsl 1274: if (wakeup_state & SS_RESTARTSYS)
1275: error = ERESTART;
1276: else
1277: error = sbwait(&so->so_rcv);
1.160 ad 1278: if (error != 0) {
1279: sounlock(so);
1280: splx(s);
1.144 dyoung 1281: return error;
1.160 ad 1282: }
1.196 dsl 1283: wakeup_state = so->so_state;
1.1 cgd 1284: goto restart;
1285: }
1.54 lukem 1286: dontblock:
1.69 thorpej 1287: /*
1288: * On entry here, m points to the first record of the socket buffer.
1.159 ad 1289: * From this point onward, we maintain 'nextrecord' as a cache of the
1290: * pointer to the next record in the socket buffer. We must keep the
1291: * various socket buffer pointers and local stack versions of the
1292: * pointers in sync, pushing out modifications before dropping the
1.160 ad 1293: * socket lock, and re-reading them when picking it up.
1.159 ad 1294: *
1295: * Otherwise, we will race with the network stack appending new data
1296: * or records onto the socket buffer by using inconsistent/stale
1297: * versions of the field, possibly resulting in socket buffer
1298: * corruption.
1299: *
1300: * By holding the high-level sblock(), we prevent simultaneous
1301: * readers from pulling off the front of the socket buffer.
1.69 thorpej 1302: */
1.144 dyoung 1303: if (l != NULL)
1.157 ad 1304: l->l_ru.ru_msgrcv++;
1.69 thorpej 1305: KASSERT(m == so->so_rcv.sb_mb);
1306: SBLASTRECORDCHK(&so->so_rcv, "soreceive 1");
1307: SBLASTMBUFCHK(&so->so_rcv, "soreceive 1");
1.1 cgd 1308: nextrecord = m->m_nextpkt;
1309: if (pr->pr_flags & PR_ADDR) {
1310: #ifdef DIAGNOSTIC
1311: if (m->m_type != MT_SONAME)
1312: panic("receive 1a");
1313: #endif
1.3 andrew 1314: orig_resid = 0;
1.1 cgd 1315: if (flags & MSG_PEEK) {
1316: if (paddr)
1317: *paddr = m_copy(m, 0, m->m_len);
1318: m = m->m_next;
1319: } else {
1320: sbfree(&so->so_rcv, m);
1.67 he 1321: mbuf_removed = 1;
1.144 dyoung 1322: if (paddr != NULL) {
1.1 cgd 1323: *paddr = m;
1324: so->so_rcv.sb_mb = m->m_next;
1.144 dyoung 1325: m->m_next = NULL;
1.1 cgd 1326: m = so->so_rcv.sb_mb;
1327: } else {
1.249 christos 1328: m = so->so_rcv.sb_mb = m_free(m);
1.1 cgd 1329: }
1.159 ad 1330: sbsync(&so->so_rcv, nextrecord);
1.1 cgd 1331: }
1332: }
1.247 rjs 1333: if (pr->pr_flags & PR_ADDR_OPT) {
1334: /*
1335: * For SCTP we may be getting a
1336: * whole message OR a partial delivery.
1337: */
1338: if (m->m_type == MT_SONAME) {
1339: orig_resid = 0;
1340: if (flags & MSG_PEEK) {
1341: if (paddr)
1342: *paddr = m_copy(m, 0, m->m_len);
1343: m = m->m_next;
1344: } else {
1345: sbfree(&so->so_rcv, m);
1346: if (paddr) {
1347: *paddr = m;
1348: so->so_rcv.sb_mb = m->m_next;
1349: m->m_next = 0;
1350: m = so->so_rcv.sb_mb;
1351: } else {
1.249 christos 1352: m = so->so_rcv.sb_mb = m_free(m);
1.247 rjs 1353: }
1354: }
1355: }
1356: }
1.159 ad 1357:
1358: /*
1359: * Process one or more MT_CONTROL mbufs present before any data mbufs
1360: * in the first mbuf chain on the socket buffer. If MSG_PEEK, we
1361: * just copy the data; if !MSG_PEEK, we call into the protocol to
1362: * perform externalization (or freeing if controlp == NULL).
1363: */
1364: if (__predict_false(m != NULL && m->m_type == MT_CONTROL)) {
1365: struct mbuf *cm = NULL, *cmn;
1366: struct mbuf **cme = &cm;
1367:
1368: do {
1369: if (flags & MSG_PEEK) {
1370: if (controlp != NULL) {
1371: *controlp = m_copy(m, 0, m->m_len);
1372: controlp = &(*controlp)->m_next;
1373: }
1374: m = m->m_next;
1375: } else {
1376: sbfree(&so->so_rcv, m);
1.1 cgd 1377: so->so_rcv.sb_mb = m->m_next;
1.144 dyoung 1378: m->m_next = NULL;
1.159 ad 1379: *cme = m;
1380: cme = &(*cme)->m_next;
1.1 cgd 1381: m = so->so_rcv.sb_mb;
1.159 ad 1382: }
1383: } while (m != NULL && m->m_type == MT_CONTROL);
1384: if ((flags & MSG_PEEK) == 0)
1385: sbsync(&so->so_rcv, nextrecord);
1386: for (; cm != NULL; cm = cmn) {
1387: cmn = cm->m_next;
1388: cm->m_next = NULL;
1389: type = mtod(cm, struct cmsghdr *)->cmsg_type;
1390: if (controlp != NULL) {
1391: if (dom->dom_externalize != NULL &&
1392: type == SCM_RIGHTS) {
1.160 ad 1393: sounlock(so);
1.159 ad 1394: splx(s);
1.204 christos 1395: error = (*dom->dom_externalize)(cm, l,
1396: (flags & MSG_CMSG_CLOEXEC) ?
1397: O_CLOEXEC : 0);
1.159 ad 1398: s = splsoftnet();
1.160 ad 1399: solock(so);
1.159 ad 1400: }
1401: *controlp = cm;
1402: while (*controlp != NULL)
1403: controlp = &(*controlp)->m_next;
1.1 cgd 1404: } else {
1.106 itojun 1405: /*
1406: * Dispose of any SCM_RIGHTS message that went
1407: * through the read path rather than recv.
1408: */
1.159 ad 1409: if (dom->dom_dispose != NULL &&
1410: type == SCM_RIGHTS) {
1.252.6.1! pgoyette 1411: sounlock(so);
1.159 ad 1412: (*dom->dom_dispose)(cm);
1.160 ad 1413: solock(so);
1.159 ad 1414: }
1415: m_freem(cm);
1.1 cgd 1416: }
1417: }
1.159 ad 1418: if (m != NULL)
1419: nextrecord = so->so_rcv.sb_mb->m_nextpkt;
1420: else
1421: nextrecord = so->so_rcv.sb_mb;
1422: orig_resid = 0;
1.1 cgd 1423: }
1.69 thorpej 1424:
1.159 ad 1425: /* If m is non-NULL, we have some data to read. */
1426: if (__predict_true(m != NULL)) {
1.1 cgd 1427: type = m->m_type;
1428: if (type == MT_OOBDATA)
1429: flags |= MSG_OOB;
1430: }
1.69 thorpej 1431: SBLASTRECORDCHK(&so->so_rcv, "soreceive 2");
1432: SBLASTMBUFCHK(&so->so_rcv, "soreceive 2");
1433:
1.1 cgd 1434: moff = 0;
1435: offset = 0;
1.144 dyoung 1436: while (m != NULL && uio->uio_resid > 0 && error == 0) {
1.1 cgd 1437: if (m->m_type == MT_OOBDATA) {
1438: if (type != MT_OOBDATA)
1439: break;
1440: } else if (type == MT_OOBDATA)
1441: break;
1442: #ifdef DIAGNOSTIC
1443: else if (m->m_type != MT_DATA && m->m_type != MT_HEADER)
1444: panic("receive 3");
1445: #endif
1446: so->so_state &= ~SS_RCVATMARK;
1.196 dsl 1447: wakeup_state = 0;
1.1 cgd 1448: len = uio->uio_resid;
1449: if (so->so_oobmark && len > so->so_oobmark - offset)
1450: len = so->so_oobmark - offset;
1451: if (len > m->m_len - moff)
1452: len = m->m_len - moff;
1453: /*
1454: * If mp is set, just pass back the mbufs.
1455: * Otherwise copy them out via the uio, then free.
1456: * Sockbuf must be consistent here (points to current mbuf,
1457: * it points to next record) when we drop priority;
1458: * we must note any additions to the sockbuf when we
1459: * block interrupts again.
1460: */
1.144 dyoung 1461: if (mp == NULL) {
1.69 thorpej 1462: SBLASTRECORDCHK(&so->so_rcv, "soreceive uiomove");
1463: SBLASTMBUFCHK(&so->so_rcv, "soreceive uiomove");
1.160 ad 1464: sounlock(so);
1.1 cgd 1465: splx(s);
1.211 chs 1466: error = uiomove(mtod(m, char *) + moff, len, uio);
1.20 mycroft 1467: s = splsoftnet();
1.160 ad 1468: solock(so);
1.144 dyoung 1469: if (error != 0) {
1.67 he 1470: /*
1471: * If any part of the record has been removed
1472: * (such as the MT_SONAME mbuf, which will
1473: * happen when PR_ADDR, and thus also
1474: * PR_ATOMIC, is set), then drop the entire
1475: * record to maintain the atomicity of the
1476: * receive operation.
1477: *
1478: * This avoids a later panic("receive 1a")
1479: * when compiled with DIAGNOSTIC.
1480: */
1.146 dyoung 1481: if (m && mbuf_removed && atomic)
1.67 he 1482: (void) sbdroprecord(&so->so_rcv);
1483:
1.57 jdolecek 1484: goto release;
1.67 he 1485: }
1.1 cgd 1486: } else
1487: uio->uio_resid -= len;
1488: if (len == m->m_len - moff) {
1489: if (m->m_flags & M_EOR)
1490: flags |= MSG_EOR;
1.247 rjs 1491: #ifdef SCTP
1492: if (m->m_flags & M_NOTIFICATION)
1493: flags |= MSG_NOTIFICATION;
1494: #endif /* SCTP */
1.1 cgd 1495: if (flags & MSG_PEEK) {
1496: m = m->m_next;
1497: moff = 0;
1498: } else {
1499: nextrecord = m->m_nextpkt;
1500: sbfree(&so->so_rcv, m);
1501: if (mp) {
1502: *mp = m;
1503: mp = &m->m_next;
1504: so->so_rcv.sb_mb = m = m->m_next;
1.140 dyoung 1505: *mp = NULL;
1.1 cgd 1506: } else {
1.249 christos 1507: m = so->so_rcv.sb_mb = m_free(m);
1.1 cgd 1508: }
1.69 thorpej 1509: /*
1510: * If m != NULL, we also know that
1511: * so->so_rcv.sb_mb != NULL.
1512: */
1513: KASSERT(so->so_rcv.sb_mb == m);
1514: if (m) {
1.1 cgd 1515: m->m_nextpkt = nextrecord;
1.69 thorpej 1516: if (nextrecord == NULL)
1517: so->so_rcv.sb_lastrecord = m;
1518: } else {
1519: so->so_rcv.sb_mb = nextrecord;
1.70 thorpej 1520: SB_EMPTY_FIXUP(&so->so_rcv);
1.69 thorpej 1521: }
1522: SBLASTRECORDCHK(&so->so_rcv, "soreceive 3");
1523: SBLASTMBUFCHK(&so->so_rcv, "soreceive 3");
1.1 cgd 1524: }
1.144 dyoung 1525: } else if (flags & MSG_PEEK)
1526: moff += len;
1527: else {
1.160 ad 1528: if (mp != NULL) {
1529: mt = m_copym(m, 0, len, M_NOWAIT);
1530: if (__predict_false(mt == NULL)) {
1531: sounlock(so);
1532: mt = m_copym(m, 0, len, M_WAIT);
1533: solock(so);
1534: }
1535: *mp = mt;
1536: }
1.144 dyoung 1537: m->m_data += len;
1538: m->m_len -= len;
1539: so->so_rcv.sb_cc -= len;
1.1 cgd 1540: }
1541: if (so->so_oobmark) {
1542: if ((flags & MSG_PEEK) == 0) {
1543: so->so_oobmark -= len;
1544: if (so->so_oobmark == 0) {
1545: so->so_state |= SS_RCVATMARK;
1546: break;
1547: }
1.7 cgd 1548: } else {
1.1 cgd 1549: offset += len;
1.7 cgd 1550: if (offset == so->so_oobmark)
1551: break;
1552: }
1.1 cgd 1553: }
1554: if (flags & MSG_EOR)
1555: break;
1556: /*
1557: * If the MSG_WAITALL flag is set (for non-atomic socket),
1558: * we must not quit until "uio->uio_resid == 0" or an error
1559: * termination. If a signal/timeout occurs, return
1560: * with a short count but without error.
1561: * Keep sockbuf locked against other readers.
1562: */
1.144 dyoung 1563: while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 &&
1.3 andrew 1564: !sosendallatonce(so) && !nextrecord) {
1.1 cgd 1565: if (so->so_error || so->so_state & SS_CANTRCVMORE)
1566: break;
1.68 matt 1567: /*
1568: * If we are peeking and the socket receive buffer is
1569: * full, stop since we can't get more data to peek at.
1570: */
1571: if ((flags & MSG_PEEK) && sbspace(&so->so_rcv) <= 0)
1572: break;
1573: /*
1574: * If we've drained the socket buffer, tell the
1575: * protocol in case it needs to do something to
1576: * get it filled again.
1577: */
1578: if ((pr->pr_flags & PR_WANTRCVD) && so->so_pcb)
1.233 rtr 1579: (*pr->pr_usrreqs->pr_rcvd)(so, flags, l);
1.69 thorpej 1580: SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 2");
1581: SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 2");
1.196 dsl 1582: if (wakeup_state & SS_RESTARTSYS)
1583: error = ERESTART;
1584: else
1585: error = sbwait(&so->so_rcv);
1.144 dyoung 1586: if (error != 0) {
1.1 cgd 1587: sbunlock(&so->so_rcv);
1.160 ad 1588: sounlock(so);
1.1 cgd 1589: splx(s);
1.144 dyoung 1590: return 0;
1.1 cgd 1591: }
1.21 christos 1592: if ((m = so->so_rcv.sb_mb) != NULL)
1.1 cgd 1593: nextrecord = m->m_nextpkt;
1.196 dsl 1594: wakeup_state = so->so_state;
1.1 cgd 1595: }
1596: }
1.3 andrew 1597:
1.146 dyoung 1598: if (m && atomic) {
1.3 andrew 1599: flags |= MSG_TRUNC;
1600: if ((flags & MSG_PEEK) == 0)
1601: (void) sbdroprecord(&so->so_rcv);
1602: }
1.1 cgd 1603: if ((flags & MSG_PEEK) == 0) {
1.144 dyoung 1604: if (m == NULL) {
1.69 thorpej 1605: /*
1.70 thorpej 1606: * First part is an inline SB_EMPTY_FIXUP(). Second
1.69 thorpej 1607: * part makes sure sb_lastrecord is up-to-date if
1608: * there is still data in the socket buffer.
1609: */
1.1 cgd 1610: so->so_rcv.sb_mb = nextrecord;
1.69 thorpej 1611: if (so->so_rcv.sb_mb == NULL) {
1612: so->so_rcv.sb_mbtail = NULL;
1613: so->so_rcv.sb_lastrecord = NULL;
1614: } else if (nextrecord->m_nextpkt == NULL)
1615: so->so_rcv.sb_lastrecord = nextrecord;
1616: }
1617: SBLASTRECORDCHK(&so->so_rcv, "soreceive 4");
1618: SBLASTMBUFCHK(&so->so_rcv, "soreceive 4");
1.1 cgd 1619: if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
1.233 rtr 1620: (*pr->pr_usrreqs->pr_rcvd)(so, flags, l);
1.1 cgd 1621: }
1.3 andrew 1622: if (orig_resid == uio->uio_resid && orig_resid &&
1623: (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) {
1624: sbunlock(&so->so_rcv);
1625: goto restart;
1626: }
1.108 perry 1627:
1.144 dyoung 1628: if (flagsp != NULL)
1.1 cgd 1629: *flagsp |= flags;
1.54 lukem 1630: release:
1.1 cgd 1631: sbunlock(&so->so_rcv);
1.160 ad 1632: sounlock(so);
1.1 cgd 1633: splx(s);
1.144 dyoung 1634: return error;
1.1 cgd 1635: }
1636:
1.14 mycroft 1637: int
1.54 lukem 1638: soshutdown(struct socket *so, int how)
1.1 cgd 1639: {
1.99 matt 1640: const struct protosw *pr;
1.160 ad 1641: int error;
1642:
1643: KASSERT(solocked(so));
1.34 kleink 1644:
1.54 lukem 1645: pr = so->so_proto;
1.34 kleink 1646: if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR))
1647: return (EINVAL);
1.1 cgd 1648:
1.160 ad 1649: if (how == SHUT_RD || how == SHUT_RDWR) {
1.1 cgd 1650: sorflush(so);
1.160 ad 1651: error = 0;
1652: }
1.34 kleink 1653: if (how == SHUT_WR || how == SHUT_RDWR)
1.229 rtr 1654: error = (*pr->pr_usrreqs->pr_shutdown)(so);
1.160 ad 1655:
1656: return error;
1.1 cgd 1657: }
1658:
1.195 dsl 1659: void
1.196 dsl 1660: sorestart(struct socket *so)
1.188 ad 1661: {
1.196 dsl 1662: /*
1663: * An application has called close() on an fd on which another
1664: * of its threads has called a socket system call.
1665: * Mark this and wake everyone up, and code that would block again
1666: * instead returns ERESTART.
1667: * On system call re-entry the fd is validated and EBADF returned.
1668: * Any other fd will block again on the 2nd syscall.
1669: */
1.188 ad 1670: solock(so);
1.196 dsl 1671: so->so_state |= SS_RESTARTSYS;
1.188 ad 1672: cv_broadcast(&so->so_cv);
1.196 dsl 1673: cv_broadcast(&so->so_snd.sb_cv);
1674: cv_broadcast(&so->so_rcv.sb_cv);
1.188 ad 1675: sounlock(so);
1676: }
1677:
1.14 mycroft 1678: void
1.54 lukem 1679: sorflush(struct socket *so)
1.1 cgd 1680: {
1.54 lukem 1681: struct sockbuf *sb, asb;
1.99 matt 1682: const struct protosw *pr;
1.160 ad 1683:
1684: KASSERT(solocked(so));
1.1 cgd 1685:
1.54 lukem 1686: sb = &so->so_rcv;
1687: pr = so->so_proto;
1.160 ad 1688: socantrcvmore(so);
1.1 cgd 1689: sb->sb_flags |= SB_NOINTR;
1.160 ad 1690: (void )sblock(sb, M_WAITOK);
1.1 cgd 1691: sbunlock(sb);
1692: asb = *sb;
1.86 wrstuden 1693: /*
1694: * Clear most of the sockbuf structure, but leave some of the
1695: * fields valid.
1696: */
1697: memset(&sb->sb_startzero, 0,
1698: sizeof(*sb) - offsetof(struct sockbuf, sb_startzero));
1.160 ad 1699: if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose) {
1700: sounlock(so);
1.1 cgd 1701: (*pr->pr_domain->dom_dispose)(asb.sb_mb);
1.160 ad 1702: solock(so);
1703: }
1.98 christos 1704: sbrelease(&asb, so);
1.1 cgd 1705: }
1706:
1.171 plunky 1707: /*
1708: * internal set SOL_SOCKET options
1709: */
1.142 dyoung 1710: static int
1.171 plunky 1711: sosetopt1(struct socket *so, const struct sockopt *sopt)
1.1 cgd 1712: {
1.219 christos 1713: int error = EINVAL, opt;
1714: int optval = 0; /* XXX: gcc */
1.171 plunky 1715: struct linger l;
1716: struct timeval tv;
1.142 dyoung 1717:
1.179 christos 1718: switch ((opt = sopt->sopt_name)) {
1.142 dyoung 1719:
1.170 tls 1720: case SO_ACCEPTFILTER:
1.177 ad 1721: error = accept_filt_setopt(so, sopt);
1722: KASSERT(solocked(so));
1.170 tls 1723: break;
1724:
1.252.6.1! pgoyette 1725: case SO_LINGER:
! 1726: error = sockopt_get(sopt, &l, sizeof(l));
1.177 ad 1727: solock(so);
1.252.6.1! pgoyette 1728: if (error)
! 1729: break;
! 1730: if (l.l_linger < 0 || l.l_linger > USHRT_MAX ||
! 1731: l.l_linger > (INT_MAX / hz)) {
1.177 ad 1732: error = EDOM;
1733: break;
1734: }
1.252.6.1! pgoyette 1735: so->so_linger = l.l_linger;
! 1736: if (l.l_onoff)
! 1737: so->so_options |= SO_LINGER;
! 1738: else
! 1739: so->so_options &= ~SO_LINGER;
! 1740: break;
1.1 cgd 1741:
1.142 dyoung 1742: case SO_DEBUG:
1743: case SO_KEEPALIVE:
1744: case SO_DONTROUTE:
1745: case SO_USELOOPBACK:
1746: case SO_BROADCAST:
1747: case SO_REUSEADDR:
1748: case SO_REUSEPORT:
1749: case SO_OOBINLINE:
1750: case SO_TIMESTAMP:
1.207 christos 1751: case SO_NOSIGPIPE:
1.184 christos 1752: #ifdef SO_OTIMESTAMP
1753: case SO_OTIMESTAMP:
1754: #endif
1.171 plunky 1755: error = sockopt_getint(sopt, &optval);
1.177 ad 1756: solock(so);
1.171 plunky 1757: if (error)
1.177 ad 1758: break;
1.171 plunky 1759: if (optval)
1.179 christos 1760: so->so_options |= opt;
1.142 dyoung 1761: else
1.179 christos 1762: so->so_options &= ~opt;
1.142 dyoung 1763: break;
1764:
1765: case SO_SNDBUF:
1766: case SO_RCVBUF:
1767: case SO_SNDLOWAT:
1768: case SO_RCVLOWAT:
1.171 plunky 1769: error = sockopt_getint(sopt, &optval);
1.177 ad 1770: solock(so);
1.171 plunky 1771: if (error)
1.177 ad 1772: break;
1.1 cgd 1773:
1.142 dyoung 1774: /*
1775: * Values < 1 make no sense for any of these
1776: * options, so disallow them.
1777: */
1.177 ad 1778: if (optval < 1) {
1779: error = EINVAL;
1780: break;
1781: }
1.1 cgd 1782:
1.179 christos 1783: switch (opt) {
1.171 plunky 1784: case SO_SNDBUF:
1.177 ad 1785: if (sbreserve(&so->so_snd, (u_long)optval, so) == 0) {
1786: error = ENOBUFS;
1787: break;
1788: }
1.171 plunky 1789: so->so_snd.sb_flags &= ~SB_AUTOSIZE;
1790: break;
1.1 cgd 1791:
1792: case SO_RCVBUF:
1.177 ad 1793: if (sbreserve(&so->so_rcv, (u_long)optval, so) == 0) {
1794: error = ENOBUFS;
1795: break;
1796: }
1.171 plunky 1797: so->so_rcv.sb_flags &= ~SB_AUTOSIZE;
1.142 dyoung 1798: break;
1799:
1800: /*
1801: * Make sure the low-water is never greater than
1802: * the high-water.
1803: */
1.1 cgd 1804: case SO_SNDLOWAT:
1.171 plunky 1805: if (optval > so->so_snd.sb_hiwat)
1806: optval = so->so_snd.sb_hiwat;
1807:
1808: so->so_snd.sb_lowat = optval;
1.142 dyoung 1809: break;
1.171 plunky 1810:
1.1 cgd 1811: case SO_RCVLOWAT:
1.171 plunky 1812: if (optval > so->so_rcv.sb_hiwat)
1813: optval = so->so_rcv.sb_hiwat;
1814:
1815: so->so_rcv.sb_lowat = optval;
1.142 dyoung 1816: break;
1817: }
1818: break;
1.28 thorpej 1819:
1.179 christos 1820: #ifdef COMPAT_50
1821: case SO_OSNDTIMEO:
1822: case SO_ORCVTIMEO: {
1823: struct timeval50 otv;
1824: error = sockopt_get(sopt, &otv, sizeof(otv));
1.186 pooka 1825: if (error) {
1826: solock(so);
1.183 christos 1827: break;
1.186 pooka 1828: }
1.179 christos 1829: timeval50_to_timeval(&otv, &tv);
1830: opt = opt == SO_OSNDTIMEO ? SO_SNDTIMEO : SO_RCVTIMEO;
1.182 christos 1831: error = 0;
1.179 christos 1832: /*FALLTHROUGH*/
1833: }
1834: #endif /* COMPAT_50 */
1835:
1.142 dyoung 1836: case SO_SNDTIMEO:
1837: case SO_RCVTIMEO:
1.182 christos 1838: if (error)
1.179 christos 1839: error = sockopt_get(sopt, &tv, sizeof(tv));
1.177 ad 1840: solock(so);
1.171 plunky 1841: if (error)
1.177 ad 1842: break;
1.171 plunky 1843:
1.177 ad 1844: if (tv.tv_sec > (INT_MAX - tv.tv_usec / tick) / hz) {
1845: error = EDOM;
1846: break;
1847: }
1.28 thorpej 1848:
1.171 plunky 1849: optval = tv.tv_sec * hz + tv.tv_usec / tick;
1850: if (optval == 0 && tv.tv_usec != 0)
1851: optval = 1;
1.28 thorpej 1852:
1.179 christos 1853: switch (opt) {
1.142 dyoung 1854: case SO_SNDTIMEO:
1.171 plunky 1855: so->so_snd.sb_timeo = optval;
1.1 cgd 1856: break;
1857: case SO_RCVTIMEO:
1.171 plunky 1858: so->so_rcv.sb_timeo = optval;
1.142 dyoung 1859: break;
1860: }
1861: break;
1.1 cgd 1862:
1.142 dyoung 1863: default:
1.177 ad 1864: solock(so);
1865: error = ENOPROTOOPT;
1866: break;
1.142 dyoung 1867: }
1.177 ad 1868: KASSERT(solocked(so));
1869: return error;
1.142 dyoung 1870: }
1.1 cgd 1871:
1.142 dyoung 1872: int
1.171 plunky 1873: sosetopt(struct socket *so, struct sockopt *sopt)
1.142 dyoung 1874: {
1875: int error, prerr;
1.1 cgd 1876:
1.177 ad 1877: if (sopt->sopt_level == SOL_SOCKET) {
1.171 plunky 1878: error = sosetopt1(so, sopt);
1.177 ad 1879: KASSERT(solocked(so));
1880: } else {
1.142 dyoung 1881: error = ENOPROTOOPT;
1.177 ad 1882: solock(so);
1883: }
1.1 cgd 1884:
1.142 dyoung 1885: if ((error == 0 || error == ENOPROTOOPT) &&
1886: so->so_proto != NULL && so->so_proto->pr_ctloutput != NULL) {
1887: /* give the protocol stack a shot */
1.171 plunky 1888: prerr = (*so->so_proto->pr_ctloutput)(PRCO_SETOPT, so, sopt);
1.142 dyoung 1889: if (prerr == 0)
1890: error = 0;
1891: else if (prerr != ENOPROTOOPT)
1892: error = prerr;
1.171 plunky 1893: }
1.160 ad 1894: sounlock(so);
1.142 dyoung 1895: return error;
1.1 cgd 1896: }
1897:
1.171 plunky 1898: /*
1899: * so_setsockopt() is a wrapper providing a sockopt structure for sosetopt()
1900: */
1901: int
1902: so_setsockopt(struct lwp *l, struct socket *so, int level, int name,
1903: const void *val, size_t valsize)
1904: {
1905: struct sockopt sopt;
1906: int error;
1907:
1908: KASSERT(valsize == 0 || val != NULL);
1909:
1910: sockopt_init(&sopt, level, name, valsize);
1911: sockopt_set(&sopt, val, valsize);
1912:
1913: error = sosetopt(so, &sopt);
1914:
1915: sockopt_destroy(&sopt);
1916:
1917: return error;
1918: }
1.252.6.1! pgoyette 1919:
1.171 plunky 1920: /*
1921: * internal get SOL_SOCKET options
1922: */
1923: static int
1924: sogetopt1(struct socket *so, struct sockopt *sopt)
1925: {
1.179 christos 1926: int error, optval, opt;
1.171 plunky 1927: struct linger l;
1928: struct timeval tv;
1929:
1.179 christos 1930: switch ((opt = sopt->sopt_name)) {
1.171 plunky 1931:
1932: case SO_ACCEPTFILTER:
1.177 ad 1933: error = accept_filt_getopt(so, sopt);
1.171 plunky 1934: break;
1935:
1936: case SO_LINGER:
1937: l.l_onoff = (so->so_options & SO_LINGER) ? 1 : 0;
1938: l.l_linger = so->so_linger;
1939:
1940: error = sockopt_set(sopt, &l, sizeof(l));
1941: break;
1942:
1943: case SO_USELOOPBACK:
1944: case SO_DONTROUTE:
1945: case SO_DEBUG:
1946: case SO_KEEPALIVE:
1947: case SO_REUSEADDR:
1948: case SO_REUSEPORT:
1949: case SO_BROADCAST:
1950: case SO_OOBINLINE:
1951: case SO_TIMESTAMP:
1.207 christos 1952: case SO_NOSIGPIPE:
1.184 christos 1953: #ifdef SO_OTIMESTAMP
1954: case SO_OTIMESTAMP:
1955: #endif
1.218 seanb 1956: case SO_ACCEPTCONN:
1.179 christos 1957: error = sockopt_setint(sopt, (so->so_options & opt) ? 1 : 0);
1.171 plunky 1958: break;
1959:
1960: case SO_TYPE:
1961: error = sockopt_setint(sopt, so->so_type);
1962: break;
1963:
1964: case SO_ERROR:
1965: error = sockopt_setint(sopt, so->so_error);
1966: so->so_error = 0;
1967: break;
1968:
1969: case SO_SNDBUF:
1970: error = sockopt_setint(sopt, so->so_snd.sb_hiwat);
1971: break;
1972:
1973: case SO_RCVBUF:
1974: error = sockopt_setint(sopt, so->so_rcv.sb_hiwat);
1975: break;
1976:
1977: case SO_SNDLOWAT:
1978: error = sockopt_setint(sopt, so->so_snd.sb_lowat);
1979: break;
1980:
1981: case SO_RCVLOWAT:
1982: error = sockopt_setint(sopt, so->so_rcv.sb_lowat);
1983: break;
1984:
1.179 christos 1985: #ifdef COMPAT_50
1986: case SO_OSNDTIMEO:
1987: case SO_ORCVTIMEO: {
1988: struct timeval50 otv;
1989:
1990: optval = (opt == SO_OSNDTIMEO ?
1991: so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
1992:
1993: otv.tv_sec = optval / hz;
1994: otv.tv_usec = (optval % hz) * tick;
1995:
1996: error = sockopt_set(sopt, &otv, sizeof(otv));
1997: break;
1998: }
1999: #endif /* COMPAT_50 */
2000:
1.171 plunky 2001: case SO_SNDTIMEO:
2002: case SO_RCVTIMEO:
1.179 christos 2003: optval = (opt == SO_SNDTIMEO ?
1.171 plunky 2004: so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
2005:
2006: tv.tv_sec = optval / hz;
2007: tv.tv_usec = (optval % hz) * tick;
2008:
2009: error = sockopt_set(sopt, &tv, sizeof(tv));
2010: break;
2011:
2012: case SO_OVERFLOWED:
2013: error = sockopt_setint(sopt, so->so_rcv.sb_overflowed);
2014: break;
2015:
2016: default:
2017: error = ENOPROTOOPT;
2018: break;
2019: }
2020:
2021: return (error);
2022: }
2023:
1.14 mycroft 2024: int
1.171 plunky 2025: sogetopt(struct socket *so, struct sockopt *sopt)
1.1 cgd 2026: {
1.160 ad 2027: int error;
1.1 cgd 2028:
1.160 ad 2029: solock(so);
1.171 plunky 2030: if (sopt->sopt_level != SOL_SOCKET) {
1.1 cgd 2031: if (so->so_proto && so->so_proto->pr_ctloutput) {
1.160 ad 2032: error = ((*so->so_proto->pr_ctloutput)
1.171 plunky 2033: (PRCO_GETOPT, so, sopt));
1.1 cgd 2034: } else
1.160 ad 2035: error = (ENOPROTOOPT);
1.1 cgd 2036: } else {
1.171 plunky 2037: error = sogetopt1(so, sopt);
2038: }
2039: sounlock(so);
2040: return (error);
2041: }
2042:
2043: /*
2044: * alloc sockopt data buffer buffer
2045: * - will be released at destroy
2046: */
1.176 plunky 2047: static int
2048: sockopt_alloc(struct sockopt *sopt, size_t len, km_flag_t kmflag)
1.171 plunky 2049: {
2050:
2051: KASSERT(sopt->sopt_size == 0);
2052:
1.176 plunky 2053: if (len > sizeof(sopt->sopt_buf)) {
2054: sopt->sopt_data = kmem_zalloc(len, kmflag);
2055: if (sopt->sopt_data == NULL)
2056: return ENOMEM;
2057: } else
1.171 plunky 2058: sopt->sopt_data = sopt->sopt_buf;
2059:
2060: sopt->sopt_size = len;
1.176 plunky 2061: return 0;
1.171 plunky 2062: }
2063:
2064: /*
2065: * initialise sockopt storage
1.176 plunky 2066: * - MAY sleep during allocation
1.171 plunky 2067: */
2068: void
2069: sockopt_init(struct sockopt *sopt, int level, int name, size_t size)
2070: {
1.1 cgd 2071:
1.171 plunky 2072: memset(sopt, 0, sizeof(*sopt));
1.1 cgd 2073:
1.171 plunky 2074: sopt->sopt_level = level;
2075: sopt->sopt_name = name;
1.176 plunky 2076: (void)sockopt_alloc(sopt, size, KM_SLEEP);
1.171 plunky 2077: }
2078:
2079: /*
2080: * destroy sockopt storage
2081: * - will release any held memory references
2082: */
2083: void
2084: sockopt_destroy(struct sockopt *sopt)
2085: {
2086:
2087: if (sopt->sopt_data != sopt->sopt_buf)
1.173 plunky 2088: kmem_free(sopt->sopt_data, sopt->sopt_size);
1.171 plunky 2089:
2090: memset(sopt, 0, sizeof(*sopt));
2091: }
2092:
2093: /*
2094: * set sockopt value
2095: * - value is copied into sockopt
1.252.6.1! pgoyette 2096: * - memory is allocated when necessary, will not sleep
1.171 plunky 2097: */
2098: int
2099: sockopt_set(struct sockopt *sopt, const void *buf, size_t len)
2100: {
1.176 plunky 2101: int error;
1.171 plunky 2102:
1.176 plunky 2103: if (sopt->sopt_size == 0) {
2104: error = sockopt_alloc(sopt, len, KM_NOSLEEP);
2105: if (error)
2106: return error;
2107: }
1.171 plunky 2108:
2109: KASSERT(sopt->sopt_size == len);
2110: memcpy(sopt->sopt_data, buf, len);
2111: return 0;
2112: }
2113:
2114: /*
2115: * common case of set sockopt integer value
2116: */
2117: int
2118: sockopt_setint(struct sockopt *sopt, int val)
2119: {
2120:
2121: return sockopt_set(sopt, &val, sizeof(int));
2122: }
2123:
2124: /*
2125: * get sockopt value
2126: * - correct size must be given
2127: */
2128: int
2129: sockopt_get(const struct sockopt *sopt, void *buf, size_t len)
2130: {
1.170 tls 2131:
1.171 plunky 2132: if (sopt->sopt_size != len)
2133: return EINVAL;
1.1 cgd 2134:
1.171 plunky 2135: memcpy(buf, sopt->sopt_data, len);
2136: return 0;
2137: }
1.1 cgd 2138:
1.171 plunky 2139: /*
2140: * common case of get sockopt integer value
2141: */
2142: int
2143: sockopt_getint(const struct sockopt *sopt, int *valp)
2144: {
1.1 cgd 2145:
1.171 plunky 2146: return sockopt_get(sopt, valp, sizeof(int));
2147: }
1.1 cgd 2148:
1.171 plunky 2149: /*
2150: * set sockopt value from mbuf
2151: * - ONLY for legacy code
2152: * - mbuf is released by sockopt
1.176 plunky 2153: * - will not sleep
1.171 plunky 2154: */
2155: int
2156: sockopt_setmbuf(struct sockopt *sopt, struct mbuf *m)
2157: {
2158: size_t len;
1.176 plunky 2159: int error;
1.1 cgd 2160:
1.171 plunky 2161: len = m_length(m);
1.1 cgd 2162:
1.176 plunky 2163: if (sopt->sopt_size == 0) {
2164: error = sockopt_alloc(sopt, len, KM_NOSLEEP);
2165: if (error)
2166: return error;
2167: }
1.1 cgd 2168:
1.171 plunky 2169: KASSERT(sopt->sopt_size == len);
2170: m_copydata(m, 0, len, sopt->sopt_data);
2171: m_freem(m);
1.1 cgd 2172:
1.171 plunky 2173: return 0;
2174: }
1.1 cgd 2175:
1.171 plunky 2176: /*
2177: * get sockopt value into mbuf
2178: * - ONLY for legacy code
2179: * - mbuf to be released by the caller
1.176 plunky 2180: * - will not sleep
1.171 plunky 2181: */
2182: struct mbuf *
2183: sockopt_getmbuf(const struct sockopt *sopt)
2184: {
2185: struct mbuf *m;
1.107 darrenr 2186:
1.176 plunky 2187: if (sopt->sopt_size > MCLBYTES)
2188: return NULL;
2189:
2190: m = m_get(M_DONTWAIT, MT_SOOPTS);
1.171 plunky 2191: if (m == NULL)
2192: return NULL;
2193:
1.176 plunky 2194: if (sopt->sopt_size > MLEN) {
2195: MCLGET(m, M_DONTWAIT);
2196: if ((m->m_flags & M_EXT) == 0) {
2197: m_free(m);
2198: return NULL;
2199: }
1.1 cgd 2200: }
1.176 plunky 2201:
2202: memcpy(mtod(m, void *), sopt->sopt_data, sopt->sopt_size);
2203: m->m_len = sopt->sopt_size;
1.160 ad 2204:
1.171 plunky 2205: return m;
1.1 cgd 2206: }
2207:
1.14 mycroft 2208: void
1.54 lukem 2209: sohasoutofband(struct socket *so)
1.1 cgd 2210: {
1.153 rmind 2211:
1.90 christos 2212: fownsignal(so->so_pgid, SIGURG, POLL_PRI, POLLPRI|POLLRDBAND, so);
1.189 ad 2213: selnotify(&so->so_rcv.sb_sel, POLLPRI | POLLRDBAND, NOTE_SUBMIT);
1.1 cgd 2214: }
1.72 jdolecek 2215:
2216: static void
2217: filt_sordetach(struct knote *kn)
2218: {
2219: struct socket *so;
2220:
1.235 matt 2221: so = ((file_t *)kn->kn_obj)->f_socket;
1.160 ad 2222: solock(so);
1.73 christos 2223: SLIST_REMOVE(&so->so_rcv.sb_sel.sel_klist, kn, knote, kn_selnext);
2224: if (SLIST_EMPTY(&so->so_rcv.sb_sel.sel_klist))
1.72 jdolecek 2225: so->so_rcv.sb_flags &= ~SB_KNOTE;
1.160 ad 2226: sounlock(so);
1.72 jdolecek 2227: }
2228:
2229: /*ARGSUSED*/
2230: static int
1.129 yamt 2231: filt_soread(struct knote *kn, long hint)
1.72 jdolecek 2232: {
2233: struct socket *so;
1.160 ad 2234: int rv;
1.72 jdolecek 2235:
1.235 matt 2236: so = ((file_t *)kn->kn_obj)->f_socket;
1.160 ad 2237: if (hint != NOTE_SUBMIT)
2238: solock(so);
1.72 jdolecek 2239: kn->kn_data = so->so_rcv.sb_cc;
2240: if (so->so_state & SS_CANTRCVMORE) {
1.108 perry 2241: kn->kn_flags |= EV_EOF;
1.72 jdolecek 2242: kn->kn_fflags = so->so_error;
1.160 ad 2243: rv = 1;
2244: } else if (so->so_error) /* temporary udp error */
2245: rv = 1;
2246: else if (kn->kn_sfflags & NOTE_LOWAT)
2247: rv = (kn->kn_data >= kn->kn_sdata);
1.252.6.1! pgoyette 2248: else
1.160 ad 2249: rv = (kn->kn_data >= so->so_rcv.sb_lowat);
2250: if (hint != NOTE_SUBMIT)
2251: sounlock(so);
2252: return rv;
1.72 jdolecek 2253: }
2254:
2255: static void
2256: filt_sowdetach(struct knote *kn)
2257: {
2258: struct socket *so;
2259:
1.235 matt 2260: so = ((file_t *)kn->kn_obj)->f_socket;
1.160 ad 2261: solock(so);
1.73 christos 2262: SLIST_REMOVE(&so->so_snd.sb_sel.sel_klist, kn, knote, kn_selnext);
2263: if (SLIST_EMPTY(&so->so_snd.sb_sel.sel_klist))
1.72 jdolecek 2264: so->so_snd.sb_flags &= ~SB_KNOTE;
1.160 ad 2265: sounlock(so);
1.72 jdolecek 2266: }
2267:
2268: /*ARGSUSED*/
2269: static int
1.129 yamt 2270: filt_sowrite(struct knote *kn, long hint)
1.72 jdolecek 2271: {
2272: struct socket *so;
1.160 ad 2273: int rv;
1.72 jdolecek 2274:
1.235 matt 2275: so = ((file_t *)kn->kn_obj)->f_socket;
1.160 ad 2276: if (hint != NOTE_SUBMIT)
2277: solock(so);
1.72 jdolecek 2278: kn->kn_data = sbspace(&so->so_snd);
2279: if (so->so_state & SS_CANTSENDMORE) {
1.108 perry 2280: kn->kn_flags |= EV_EOF;
1.72 jdolecek 2281: kn->kn_fflags = so->so_error;
1.160 ad 2282: rv = 1;
2283: } else if (so->so_error) /* temporary udp error */
2284: rv = 1;
2285: else if (((so->so_state & SS_ISCONNECTED) == 0) &&
1.72 jdolecek 2286: (so->so_proto->pr_flags & PR_CONNREQUIRED))
1.160 ad 2287: rv = 0;
2288: else if (kn->kn_sfflags & NOTE_LOWAT)
2289: rv = (kn->kn_data >= kn->kn_sdata);
2290: else
2291: rv = (kn->kn_data >= so->so_snd.sb_lowat);
2292: if (hint != NOTE_SUBMIT)
2293: sounlock(so);
2294: return rv;
1.72 jdolecek 2295: }
2296:
2297: /*ARGSUSED*/
2298: static int
1.129 yamt 2299: filt_solisten(struct knote *kn, long hint)
1.72 jdolecek 2300: {
2301: struct socket *so;
1.160 ad 2302: int rv;
1.72 jdolecek 2303:
1.235 matt 2304: so = ((file_t *)kn->kn_obj)->f_socket;
1.72 jdolecek 2305:
2306: /*
2307: * Set kn_data to number of incoming connections, not
2308: * counting partial (incomplete) connections.
1.108 perry 2309: */
1.160 ad 2310: if (hint != NOTE_SUBMIT)
2311: solock(so);
1.72 jdolecek 2312: kn->kn_data = so->so_qlen;
1.160 ad 2313: rv = (kn->kn_data > 0);
2314: if (hint != NOTE_SUBMIT)
2315: sounlock(so);
2316: return rv;
1.72 jdolecek 2317: }
2318:
2319: static const struct filterops solisten_filtops =
2320: { 1, NULL, filt_sordetach, filt_solisten };
2321: static const struct filterops soread_filtops =
2322: { 1, NULL, filt_sordetach, filt_soread };
2323: static const struct filterops sowrite_filtops =
2324: { 1, NULL, filt_sowdetach, filt_sowrite };
2325:
2326: int
1.129 yamt 2327: soo_kqfilter(struct file *fp, struct knote *kn)
1.72 jdolecek 2328: {
2329: struct socket *so;
2330: struct sockbuf *sb;
2331:
1.235 matt 2332: so = ((file_t *)kn->kn_obj)->f_socket;
1.160 ad 2333: solock(so);
1.72 jdolecek 2334: switch (kn->kn_filter) {
2335: case EVFILT_READ:
2336: if (so->so_options & SO_ACCEPTCONN)
2337: kn->kn_fop = &solisten_filtops;
2338: else
2339: kn->kn_fop = &soread_filtops;
2340: sb = &so->so_rcv;
2341: break;
2342: case EVFILT_WRITE:
2343: kn->kn_fop = &sowrite_filtops;
2344: sb = &so->so_snd;
2345: break;
2346: default:
1.160 ad 2347: sounlock(so);
1.149 pooka 2348: return (EINVAL);
1.72 jdolecek 2349: }
1.73 christos 2350: SLIST_INSERT_HEAD(&sb->sb_sel.sel_klist, kn, kn_selnext);
1.72 jdolecek 2351: sb->sb_flags |= SB_KNOTE;
1.160 ad 2352: sounlock(so);
1.72 jdolecek 2353: return (0);
2354: }
2355:
1.154 ad 2356: static int
2357: sodopoll(struct socket *so, int events)
2358: {
2359: int revents;
2360:
2361: revents = 0;
2362:
2363: if (events & (POLLIN | POLLRDNORM))
2364: if (soreadable(so))
2365: revents |= events & (POLLIN | POLLRDNORM);
2366:
2367: if (events & (POLLOUT | POLLWRNORM))
2368: if (sowritable(so))
2369: revents |= events & (POLLOUT | POLLWRNORM);
2370:
2371: if (events & (POLLPRI | POLLRDBAND))
2372: if (so->so_oobmark || (so->so_state & SS_RCVATMARK))
2373: revents |= events & (POLLPRI | POLLRDBAND);
2374:
2375: return revents;
2376: }
2377:
2378: int
2379: sopoll(struct socket *so, int events)
2380: {
2381: int revents = 0;
2382:
1.160 ad 2383: #ifndef DIAGNOSTIC
2384: /*
2385: * Do a quick, unlocked check in expectation that the socket
2386: * will be ready for I/O. Don't do this check if DIAGNOSTIC,
2387: * as the solocked() assertions will fail.
2388: */
1.154 ad 2389: if ((revents = sodopoll(so, events)) != 0)
2390: return revents;
1.160 ad 2391: #endif
1.154 ad 2392:
1.160 ad 2393: solock(so);
1.154 ad 2394: if ((revents = sodopoll(so, events)) == 0) {
2395: if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
2396: selrecord(curlwp, &so->so_rcv.sb_sel);
1.160 ad 2397: so->so_rcv.sb_flags |= SB_NOTIFY;
1.154 ad 2398: }
2399:
2400: if (events & (POLLOUT | POLLWRNORM)) {
2401: selrecord(curlwp, &so->so_snd.sb_sel);
1.160 ad 2402: so->so_snd.sb_flags |= SB_NOTIFY;
1.154 ad 2403: }
2404: }
1.160 ad 2405: sounlock(so);
1.154 ad 2406:
2407: return revents;
2408: }
2409:
2410:
1.94 yamt 2411: #include <sys/sysctl.h>
2412:
2413: static int sysctl_kern_somaxkva(SYSCTLFN_PROTO);
1.212 pooka 2414: static int sysctl_kern_sbmax(SYSCTLFN_PROTO);
1.94 yamt 2415:
2416: /*
2417: * sysctl helper routine for kern.somaxkva. ensures that the given
2418: * value is not too small.
2419: * (XXX should we maybe make sure it's not too large as well?)
2420: */
2421: static int
2422: sysctl_kern_somaxkva(SYSCTLFN_ARGS)
2423: {
2424: int error, new_somaxkva;
2425: struct sysctlnode node;
2426:
2427: new_somaxkva = somaxkva;
2428: node = *rnode;
2429: node.sysctl_data = &new_somaxkva;
2430: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2431: if (error || newp == NULL)
2432: return (error);
2433:
2434: if (new_somaxkva < (16 * 1024 * 1024)) /* sanity */
2435: return (EINVAL);
2436:
1.136 ad 2437: mutex_enter(&so_pendfree_lock);
1.94 yamt 2438: somaxkva = new_somaxkva;
1.136 ad 2439: cv_broadcast(&socurkva_cv);
2440: mutex_exit(&so_pendfree_lock);
1.94 yamt 2441:
2442: return (error);
2443: }
2444:
1.212 pooka 2445: /*
2446: * sysctl helper routine for kern.sbmax. Basically just ensures that
2447: * any new value is not too small.
2448: */
2449: static int
2450: sysctl_kern_sbmax(SYSCTLFN_ARGS)
2451: {
2452: int error, new_sbmax;
2453: struct sysctlnode node;
2454:
2455: new_sbmax = sb_max;
2456: node = *rnode;
2457: node.sysctl_data = &new_sbmax;
2458: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2459: if (error || newp == NULL)
2460: return (error);
2461:
2462: KERNEL_LOCK(1, NULL);
2463: error = sb_max_set(new_sbmax);
2464: KERNEL_UNLOCK_ONE(NULL);
2465:
2466: return (error);
2467: }
2468:
1.178 pooka 2469: static void
1.212 pooka 2470: sysctl_kern_socket_setup(void)
1.94 yamt 2471: {
2472:
1.178 pooka 2473: KASSERT(socket_sysctllog == NULL);
1.97 atatat 2474:
1.178 pooka 2475: sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
1.97 atatat 2476: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.103 atatat 2477: CTLTYPE_INT, "somaxkva",
2478: SYSCTL_DESCR("Maximum amount of kernel memory to be "
2479: "used for socket buffers"),
1.94 yamt 2480: sysctl_kern_somaxkva, 0, NULL, 0,
2481: CTL_KERN, KERN_SOMAXKVA, CTL_EOL);
1.212 pooka 2482:
2483: sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
2484: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2485: CTLTYPE_INT, "sbmax",
2486: SYSCTL_DESCR("Maximum socket buffer size"),
2487: sysctl_kern_sbmax, 0, NULL, 0,
2488: CTL_KERN, KERN_SBMAX, CTL_EOL);
1.94 yamt 2489: }
CVSweb <webmaster@jp.NetBSD.org>