Annotation of src/sys/kern/uipc_socket.c, Revision 1.209.2.2.2.1
1.209.2.2.2.1! (martin 1:: /* $NetBSD: uipc_socket.c,v 1.209.2.2 2013/02/14 22:13:59 jdc 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:
65: #include <sys/cdefs.h>
1.209.2.2.2.1! (martin 66:: __KERNEL_RCSID(0, "$NetBSD: uipc_socket.c,v 1.209.2.2 2013/02/14 22:13:59 jdc Exp $");
1.64 thorpej 67:
1.179 christos 68: #include "opt_compat_netbsd.h"
1.64 thorpej 69: #include "opt_sock_counters.h"
70: #include "opt_sosend_loan.h"
1.81 martin 71: #include "opt_mbuftrace.h"
1.84 ragge 72: #include "opt_somaxkva.h"
1.167 ad 73: #include "opt_multiprocessor.h" /* XXX */
1.1 cgd 74:
1.9 mycroft 75: #include <sys/param.h>
76: #include <sys/systm.h>
77: #include <sys/proc.h>
78: #include <sys/file.h>
1.142 dyoung 79: #include <sys/filedesc.h>
1.173 plunky 80: #include <sys/kmem.h>
1.9 mycroft 81: #include <sys/mbuf.h>
82: #include <sys/domain.h>
83: #include <sys/kernel.h>
84: #include <sys/protosw.h>
85: #include <sys/socket.h>
86: #include <sys/socketvar.h>
1.21 christos 87: #include <sys/signalvar.h>
1.9 mycroft 88: #include <sys/resourcevar.h>
1.174 pooka 89: #include <sys/uidinfo.h>
1.72 jdolecek 90: #include <sys/event.h>
1.89 christos 91: #include <sys/poll.h>
1.118 elad 92: #include <sys/kauth.h>
1.136 ad 93: #include <sys/mutex.h>
94: #include <sys/condvar.h>
1.205 bouyer 95: #include <sys/kthread.h>
1.37 thorpej 96:
1.179 christos 97: #ifdef COMPAT_50
98: #include <compat/sys/time.h>
1.184 christos 99: #include <compat/sys/socket.h>
1.179 christos 100: #endif
101:
1.202 uebayasi 102: #include <uvm/uvm_extern.h>
103: #include <uvm/uvm_loan.h>
104: #include <uvm/uvm_page.h>
1.64 thorpej 105:
1.77 thorpej 106: MALLOC_DEFINE(M_SOOPTS, "soopts", "socket options");
107: MALLOC_DEFINE(M_SONAME, "soname", "socket name");
1.37 thorpej 108:
1.142 dyoung 109: extern const struct fileops socketops;
110:
1.54 lukem 111: extern int somaxconn; /* patchable (XXX sysctl) */
112: int somaxconn = SOMAXCONN;
1.160 ad 113: kmutex_t *softnet_lock;
1.49 jonathan 114:
1.64 thorpej 115: #ifdef SOSEND_COUNTERS
116: #include <sys/device.h>
117:
1.113 thorpej 118: static struct evcnt sosend_loan_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64 thorpej 119: NULL, "sosend", "loan big");
1.113 thorpej 120: static struct evcnt sosend_copy_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64 thorpej 121: NULL, "sosend", "copy big");
1.113 thorpej 122: static struct evcnt sosend_copy_small = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64 thorpej 123: NULL, "sosend", "copy small");
1.113 thorpej 124: static struct evcnt sosend_kvalimit = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64 thorpej 125: NULL, "sosend", "kva limit");
126:
127: #define SOSEND_COUNTER_INCR(ev) (ev)->ev_count++
128:
1.101 matt 129: EVCNT_ATTACH_STATIC(sosend_loan_big);
130: EVCNT_ATTACH_STATIC(sosend_copy_big);
131: EVCNT_ATTACH_STATIC(sosend_copy_small);
132: EVCNT_ATTACH_STATIC(sosend_kvalimit);
1.64 thorpej 133: #else
134:
135: #define SOSEND_COUNTER_INCR(ev) /* nothing */
136:
137: #endif /* SOSEND_COUNTERS */
138:
1.167 ad 139: #if defined(SOSEND_NO_LOAN) || defined(MULTIPROCESSOR)
1.121 yamt 140: int sock_loan_thresh = -1;
1.71 thorpej 141: #else
1.121 yamt 142: int sock_loan_thresh = 4096;
1.65 thorpej 143: #endif
1.64 thorpej 144:
1.136 ad 145: static kmutex_t so_pendfree_lock;
1.205 bouyer 146: static struct mbuf *so_pendfree = NULL;
1.64 thorpej 147:
1.84 ragge 148: #ifndef SOMAXKVA
149: #define SOMAXKVA (16 * 1024 * 1024)
150: #endif
151: int somaxkva = SOMAXKVA;
1.113 thorpej 152: static int socurkva;
1.136 ad 153: static kcondvar_t socurkva_cv;
1.64 thorpej 154:
1.191 elad 155: static kauth_listener_t socket_listener;
156:
1.64 thorpej 157: #define SOCK_LOAN_CHUNK 65536
158:
1.205 bouyer 159: static void sopendfree_thread(void *);
160: static kcondvar_t pendfree_thread_cv;
161: static lwp_t *sopendfree_lwp;
1.93 yamt 162:
1.178 pooka 163: static void sysctl_kern_somaxkva_setup(void);
164: static struct sysctllog *socket_sysctllog;
165:
1.113 thorpej 166: static vsize_t
1.129 yamt 167: sokvareserve(struct socket *so, vsize_t len)
1.80 yamt 168: {
1.98 christos 169: int error;
1.80 yamt 170:
1.136 ad 171: mutex_enter(&so_pendfree_lock);
1.80 yamt 172: while (socurkva + len > somaxkva) {
173: SOSEND_COUNTER_INCR(&sosend_kvalimit);
1.136 ad 174: error = cv_wait_sig(&socurkva_cv, &so_pendfree_lock);
1.98 christos 175: if (error) {
176: len = 0;
177: break;
178: }
1.80 yamt 179: }
1.93 yamt 180: socurkva += len;
1.136 ad 181: mutex_exit(&so_pendfree_lock);
1.98 christos 182: return len;
1.95 yamt 183: }
184:
1.113 thorpej 185: static void
1.95 yamt 186: sokvaunreserve(vsize_t len)
187: {
188:
1.136 ad 189: mutex_enter(&so_pendfree_lock);
1.95 yamt 190: socurkva -= len;
1.136 ad 191: cv_broadcast(&socurkva_cv);
192: mutex_exit(&so_pendfree_lock);
1.95 yamt 193: }
194:
195: /*
196: * sokvaalloc: allocate kva for loan.
197: */
198:
199: vaddr_t
1.209 matt 200: sokvaalloc(vaddr_t sva, vsize_t len, struct socket *so)
1.95 yamt 201: {
202: vaddr_t lva;
203:
204: /*
205: * reserve kva.
206: */
207:
1.98 christos 208: if (sokvareserve(so, len) == 0)
209: return 0;
1.93 yamt 210:
211: /*
212: * allocate kva.
213: */
1.80 yamt 214:
1.209 matt 215: lva = uvm_km_alloc(kernel_map, len, atop(sva) & uvmexp.colormask,
216: UVM_KMF_COLORMATCH | UVM_KMF_VAONLY | UVM_KMF_WAITVA);
1.95 yamt 217: if (lva == 0) {
218: sokvaunreserve(len);
1.80 yamt 219: return (0);
1.95 yamt 220: }
1.80 yamt 221:
222: return lva;
223: }
224:
1.93 yamt 225: /*
226: * sokvafree: free kva for loan.
227: */
228:
1.80 yamt 229: void
230: sokvafree(vaddr_t sva, vsize_t len)
231: {
1.93 yamt 232:
233: /*
234: * free kva.
235: */
1.80 yamt 236:
1.109 yamt 237: uvm_km_free(kernel_map, sva, len, UVM_KMF_VAONLY);
1.93 yamt 238:
239: /*
240: * unreserve kva.
241: */
242:
1.95 yamt 243: sokvaunreserve(len);
1.80 yamt 244: }
245:
1.64 thorpej 246: static void
1.134 christos 247: sodoloanfree(struct vm_page **pgs, void *buf, size_t size)
1.64 thorpej 248: {
1.156 yamt 249: vaddr_t sva, eva;
1.64 thorpej 250: vsize_t len;
1.156 yamt 251: int npgs;
252:
253: KASSERT(pgs != NULL);
1.64 thorpej 254:
255: eva = round_page((vaddr_t) buf + size);
256: sva = trunc_page((vaddr_t) buf);
257: len = eva - sva;
258: npgs = len >> PAGE_SHIFT;
259:
260: pmap_kremove(sva, len);
261: pmap_update(pmap_kernel());
262: uvm_unloan(pgs, npgs, UVM_LOAN_TOPAGE);
1.80 yamt 263: sokvafree(sva, len);
1.64 thorpej 264: }
265:
1.93 yamt 266: /*
1.205 bouyer 267: * sopendfree_thread: free mbufs on "pendfree" list.
1.136 ad 268: * unlock and relock so_pendfree_lock when freeing mbufs.
1.93 yamt 269: */
270:
1.205 bouyer 271: static void
272: sopendfree_thread(void *v)
1.93 yamt 273: {
1.137 ad 274: struct mbuf *m, *next;
1.205 bouyer 275: size_t rv;
1.93 yamt 276:
1.205 bouyer 277: mutex_enter(&so_pendfree_lock);
1.64 thorpej 278:
1.205 bouyer 279: for (;;) {
280: rv = 0;
281: while (so_pendfree != NULL) {
282: m = so_pendfree;
283: so_pendfree = NULL;
284: mutex_exit(&so_pendfree_lock);
285:
286: for (; m != NULL; m = next) {
287: next = m->m_next;
288: KASSERT((~m->m_flags & (M_EXT|M_EXT_PAGES)) == 0);
289: KASSERT(m->m_ext.ext_refcnt == 0);
290:
291: rv += m->m_ext.ext_size;
292: sodoloanfree(m->m_ext.ext_pgs, m->m_ext.ext_buf,
293: m->m_ext.ext_size);
294: pool_cache_put(mb_cache, m);
295: }
1.93 yamt 296:
1.205 bouyer 297: mutex_enter(&so_pendfree_lock);
1.93 yamt 298: }
1.205 bouyer 299: if (rv)
300: cv_broadcast(&socurkva_cv);
301: cv_wait(&pendfree_thread_cv, &so_pendfree_lock);
1.64 thorpej 302: }
1.205 bouyer 303: panic("sopendfree_thread");
304: /* NOTREACHED */
1.64 thorpej 305: }
306:
1.80 yamt 307: void
1.134 christos 308: soloanfree(struct mbuf *m, void *buf, size_t size, void *arg)
1.64 thorpej 309: {
310:
1.156 yamt 311: KASSERT(m != NULL);
1.64 thorpej 312:
1.93 yamt 313: /*
314: * postpone freeing mbuf.
315: *
316: * we can't do it in interrupt context
317: * because we need to put kva back to kernel_map.
318: */
319:
1.136 ad 320: mutex_enter(&so_pendfree_lock);
1.92 yamt 321: m->m_next = so_pendfree;
322: so_pendfree = m;
1.205 bouyer 323: cv_signal(&pendfree_thread_cv);
1.136 ad 324: mutex_exit(&so_pendfree_lock);
1.64 thorpej 325: }
326:
327: static long
328: sosend_loan(struct socket *so, struct uio *uio, struct mbuf *m, long space)
329: {
330: struct iovec *iov = uio->uio_iov;
331: vaddr_t sva, eva;
332: vsize_t len;
1.156 yamt 333: vaddr_t lva;
334: int npgs, error;
335: vaddr_t va;
336: int i;
1.64 thorpej 337:
1.116 yamt 338: if (VMSPACE_IS_KERNEL_P(uio->uio_vmspace))
1.64 thorpej 339: return (0);
340:
341: if (iov->iov_len < (size_t) space)
342: space = iov->iov_len;
343: if (space > SOCK_LOAN_CHUNK)
344: space = SOCK_LOAN_CHUNK;
345:
346: eva = round_page((vaddr_t) iov->iov_base + space);
347: sva = trunc_page((vaddr_t) iov->iov_base);
348: len = eva - sva;
349: npgs = len >> PAGE_SHIFT;
350:
1.79 thorpej 351: KASSERT(npgs <= M_EXT_MAXPAGES);
352:
1.209 matt 353: lva = sokvaalloc(sva, len, so);
1.64 thorpej 354: if (lva == 0)
1.80 yamt 355: return 0;
1.64 thorpej 356:
1.116 yamt 357: error = uvm_loan(&uio->uio_vmspace->vm_map, sva, len,
1.79 thorpej 358: m->m_ext.ext_pgs, UVM_LOAN_TOPAGE);
1.64 thorpej 359: if (error) {
1.80 yamt 360: sokvafree(lva, len);
1.64 thorpej 361: return (0);
362: }
363:
364: for (i = 0, va = lva; i < npgs; i++, va += PAGE_SIZE)
1.79 thorpej 365: pmap_kenter_pa(va, VM_PAGE_TO_PHYS(m->m_ext.ext_pgs[i]),
1.194 cegger 366: VM_PROT_READ, 0);
1.64 thorpej 367: pmap_update(pmap_kernel());
368:
369: lva += (vaddr_t) iov->iov_base & PAGE_MASK;
370:
1.134 christos 371: MEXTADD(m, (void *) lva, space, M_MBUF, soloanfree, so);
1.79 thorpej 372: m->m_flags |= M_EXT_PAGES | M_EXT_ROMAP;
1.64 thorpej 373:
374: uio->uio_resid -= space;
375: /* uio_offset not updated, not set/used for write(2) */
1.134 christos 376: uio->uio_iov->iov_base = (char *)uio->uio_iov->iov_base + space;
1.64 thorpej 377: uio->uio_iov->iov_len -= space;
378: if (uio->uio_iov->iov_len == 0) {
379: uio->uio_iov++;
380: uio->uio_iovcnt--;
381: }
382:
383: return (space);
384: }
385:
1.142 dyoung 386: struct mbuf *
1.147 dyoung 387: getsombuf(struct socket *so, int type)
1.142 dyoung 388: {
389: struct mbuf *m;
390:
1.147 dyoung 391: m = m_get(M_WAIT, type);
1.142 dyoung 392: MCLAIM(m, so->so_mowner);
393: return m;
394: }
395:
1.191 elad 396: static int
397: socket_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie,
398: void *arg0, void *arg1, void *arg2, void *arg3)
399: {
400: int result;
401: enum kauth_network_req req;
402:
403: result = KAUTH_RESULT_DEFER;
404: req = (enum kauth_network_req)arg0;
405:
1.193 elad 406: if ((action != KAUTH_NETWORK_SOCKET) &&
407: (action != KAUTH_NETWORK_BIND))
1.191 elad 408: return result;
409:
410: switch (req) {
1.193 elad 411: case KAUTH_REQ_NETWORK_BIND_PORT:
412: result = KAUTH_RESULT_ALLOW;
413: break;
414:
1.191 elad 415: case KAUTH_REQ_NETWORK_SOCKET_DROP: {
416: /* Normal users can only drop their own connections. */
417: struct socket *so = (struct socket *)arg1;
418:
1.209.2.2.2.1! (martin 419:: if (proc_uidmatch(cred, so->so_cred) == 0)
1.191 elad 420: result = KAUTH_RESULT_ALLOW;
421:
422: break;
423: }
424:
425: case KAUTH_REQ_NETWORK_SOCKET_OPEN:
426: /* We allow "raw" routing/bluetooth sockets to anyone. */
1.203 matt 427: if ((u_long)arg1 == PF_ROUTE || (u_long)arg1 == PF_OROUTE
428: || (u_long)arg1 == PF_BLUETOOTH) {
1.191 elad 429: result = KAUTH_RESULT_ALLOW;
1.203 matt 430: } else {
1.191 elad 431: /* Privileged, let secmodel handle this. */
432: if ((u_long)arg2 == SOCK_RAW)
433: break;
434: }
435:
436: result = KAUTH_RESULT_ALLOW;
437:
438: break;
439:
1.192 elad 440: case KAUTH_REQ_NETWORK_SOCKET_CANSEE:
441: result = KAUTH_RESULT_ALLOW;
442:
443: break;
444:
1.191 elad 445: default:
446: break;
447: }
448:
449: return result;
450: }
451:
1.119 yamt 452: void
453: soinit(void)
454: {
455:
1.178 pooka 456: sysctl_kern_somaxkva_setup();
457:
1.148 ad 458: mutex_init(&so_pendfree_lock, MUTEX_DEFAULT, IPL_VM);
1.160 ad 459: softnet_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
1.136 ad 460: cv_init(&socurkva_cv, "sokva");
1.205 bouyer 461: cv_init(&pendfree_thread_cv, "sopendfr");
1.166 ad 462: soinit2();
1.136 ad 463:
1.119 yamt 464: /* Set the initial adjusted socket buffer size. */
465: if (sb_max_set(sb_max))
466: panic("bad initial sb_max value: %lu", sb_max);
467:
1.191 elad 468: socket_listener = kauth_listen_scope(KAUTH_SCOPE_NETWORK,
469: socket_listener_cb, NULL);
1.119 yamt 470: }
471:
1.205 bouyer 472: void
473: soinit1(void)
474: {
475: int error = kthread_create(PRI_NONE, KTHREAD_MPSAFE, NULL,
476: sopendfree_thread, NULL, &sopendfree_lwp, "sopendfree");
477: if (error)
478: panic("soinit1 %d", error);
479: }
480:
1.1 cgd 481: /*
482: * Socket operation routines.
483: * These routines are called by the routines in
484: * sys_socket.c or from a system process, and
485: * implement the semantics of socket operations by
486: * switching out to the protocol specific routines.
487: */
488: /*ARGSUSED*/
1.3 andrew 489: int
1.160 ad 490: socreate(int dom, struct socket **aso, int type, int proto, struct lwp *l,
491: struct socket *lockso)
1.1 cgd 492: {
1.99 matt 493: const struct protosw *prp;
1.54 lukem 494: struct socket *so;
1.115 yamt 495: uid_t uid;
1.160 ad 496: int error;
497: kmutex_t *lock;
1.1 cgd 498:
1.132 elad 499: error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_SOCKET,
500: KAUTH_REQ_NETWORK_SOCKET_OPEN, KAUTH_ARG(dom), KAUTH_ARG(type),
501: KAUTH_ARG(proto));
1.140 dyoung 502: if (error != 0)
503: return error;
1.127 elad 504:
1.1 cgd 505: if (proto)
506: prp = pffindproto(dom, proto, type);
507: else
508: prp = pffindtype(dom, type);
1.140 dyoung 509: if (prp == NULL) {
1.120 ginsbach 510: /* no support for domain */
511: if (pffinddomain(dom) == 0)
1.140 dyoung 512: return EAFNOSUPPORT;
1.120 ginsbach 513: /* no support for socket type */
514: if (proto == 0 && type != 0)
1.140 dyoung 515: return EPROTOTYPE;
516: return EPROTONOSUPPORT;
1.120 ginsbach 517: }
1.140 dyoung 518: if (prp->pr_usrreq == NULL)
519: return EPROTONOSUPPORT;
1.1 cgd 520: if (prp->pr_type != type)
1.140 dyoung 521: return EPROTOTYPE;
1.160 ad 522:
523: so = soget(true);
1.1 cgd 524: so->so_type = type;
525: so->so_proto = prp;
1.33 matt 526: so->so_send = sosend;
527: so->so_receive = soreceive;
1.78 matt 528: #ifdef MBUFTRACE
529: so->so_rcv.sb_mowner = &prp->pr_domain->dom_mowner;
530: so->so_snd.sb_mowner = &prp->pr_domain->dom_mowner;
531: so->so_mowner = &prp->pr_domain->dom_mowner;
532: #endif
1.138 rmind 533: uid = kauth_cred_geteuid(l->l_cred);
1.115 yamt 534: so->so_uidinfo = uid_find(uid);
1.168 yamt 535: so->so_cpid = l->l_proc->p_pid;
1.160 ad 536: if (lockso != NULL) {
537: /* Caller wants us to share a lock. */
538: lock = lockso->so_lock;
539: so->so_lock = lock;
540: mutex_obj_hold(lock);
541: mutex_enter(lock);
542: } else {
543: /* Lock assigned and taken during PRU_ATTACH. */
544: }
1.140 dyoung 545: error = (*prp->pr_usrreq)(so, PRU_ATTACH, NULL,
546: (struct mbuf *)(long)proto, NULL, l);
1.160 ad 547: KASSERT(solocked(so));
1.140 dyoung 548: if (error != 0) {
1.1 cgd 549: so->so_state |= SS_NOFDREF;
550: sofree(so);
1.140 dyoung 551: return error;
1.1 cgd 552: }
1.198 elad 553: so->so_cred = kauth_cred_dup(l->l_cred);
1.160 ad 554: sounlock(so);
1.1 cgd 555: *aso = so;
1.140 dyoung 556: return 0;
1.1 cgd 557: }
558:
1.142 dyoung 559: /* On success, write file descriptor to fdout and return zero. On
560: * failure, return non-zero; *fdout will be undefined.
561: */
562: int
563: fsocreate(int domain, struct socket **sop, int type, int protocol,
564: struct lwp *l, int *fdout)
565: {
566: struct socket *so;
567: struct file *fp;
568: int fd, error;
1.204 christos 569: int flags = type & SOCK_FLAGS_MASK;
1.142 dyoung 570:
1.204 christos 571: type &= ~SOCK_FLAGS_MASK;
1.155 ad 572: if ((error = fd_allocfile(&fp, &fd)) != 0)
1.204 christos 573: return error;
574: fd_set_exclose(l, fd, (flags & SOCK_CLOEXEC) != 0);
1.207 christos 575: fp->f_flag = FREAD|FWRITE|((flags & SOCK_NONBLOCK) ? FNONBLOCK : 0)|
576: ((flags & SOCK_NOSIGPIPE) ? FNOSIGPIPE : 0);
1.142 dyoung 577: fp->f_type = DTYPE_SOCKET;
578: fp->f_ops = &socketops;
1.160 ad 579: error = socreate(domain, &so, type, protocol, l, NULL);
1.142 dyoung 580: if (error != 0) {
1.155 ad 581: fd_abort(curproc, fp, fd);
1.142 dyoung 582: } else {
583: if (sop != NULL)
584: *sop = so;
585: fp->f_data = so;
1.155 ad 586: fd_affix(curproc, fp, fd);
1.142 dyoung 587: *fdout = fd;
1.209.2.2 jdc 588: if (flags & SOCK_NONBLOCK)
589: so->so_state |= SS_NBIO;
1.142 dyoung 590: }
591: return error;
592: }
593:
1.3 andrew 594: int
1.190 dyoung 595: sofamily(const struct socket *so)
596: {
597: const struct protosw *pr;
598: const struct domain *dom;
599:
600: if ((pr = so->so_proto) == NULL)
601: return AF_UNSPEC;
602: if ((dom = pr->pr_domain) == NULL)
603: return AF_UNSPEC;
604: return dom->dom_family;
605: }
606:
607: int
1.114 christos 608: sobind(struct socket *so, struct mbuf *nam, struct lwp *l)
1.1 cgd 609: {
1.160 ad 610: int error;
1.1 cgd 611:
1.160 ad 612: solock(so);
1.140 dyoung 613: error = (*so->so_proto->pr_usrreq)(so, PRU_BIND, NULL, nam, NULL, l);
1.160 ad 614: sounlock(so);
1.140 dyoung 615: return error;
1.1 cgd 616: }
617:
1.3 andrew 618: int
1.150 elad 619: solisten(struct socket *so, int backlog, struct lwp *l)
1.1 cgd 620: {
1.160 ad 621: int error;
1.1 cgd 622:
1.160 ad 623: solock(so);
1.158 ad 624: if ((so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING |
1.163 ad 625: SS_ISDISCONNECTING)) != 0) {
626: sounlock(so);
1.158 ad 627: return (EOPNOTSUPP);
1.163 ad 628: }
1.140 dyoung 629: error = (*so->so_proto->pr_usrreq)(so, PRU_LISTEN, NULL,
1.150 elad 630: NULL, NULL, l);
1.140 dyoung 631: if (error != 0) {
1.160 ad 632: sounlock(so);
1.140 dyoung 633: return error;
1.1 cgd 634: }
1.63 matt 635: if (TAILQ_EMPTY(&so->so_q))
1.1 cgd 636: so->so_options |= SO_ACCEPTCONN;
637: if (backlog < 0)
638: backlog = 0;
1.49 jonathan 639: so->so_qlimit = min(backlog, somaxconn);
1.160 ad 640: sounlock(so);
1.140 dyoung 641: return 0;
1.1 cgd 642: }
643:
1.21 christos 644: void
1.54 lukem 645: sofree(struct socket *so)
1.1 cgd 646: {
1.161 ad 647: u_int refs;
1.1 cgd 648:
1.160 ad 649: KASSERT(solocked(so));
650:
651: if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0) {
652: sounlock(so);
1.1 cgd 653: return;
1.160 ad 654: }
1.43 mycroft 655: if (so->so_head) {
656: /*
657: * We must not decommission a socket that's on the accept(2)
658: * queue. If we do, then accept(2) may hang after select(2)
659: * indicated that the listening socket was ready.
660: */
1.160 ad 661: if (!soqremque(so, 0)) {
662: sounlock(so);
1.43 mycroft 663: return;
1.160 ad 664: }
1.43 mycroft 665: }
1.98 christos 666: if (so->so_rcv.sb_hiwat)
1.110 christos 667: (void)chgsbsize(so->so_uidinfo, &so->so_rcv.sb_hiwat, 0,
1.98 christos 668: RLIM_INFINITY);
669: if (so->so_snd.sb_hiwat)
1.110 christos 670: (void)chgsbsize(so->so_uidinfo, &so->so_snd.sb_hiwat, 0,
1.98 christos 671: RLIM_INFINITY);
672: sbrelease(&so->so_snd, so);
1.160 ad 673: KASSERT(!cv_has_waiters(&so->so_cv));
674: KASSERT(!cv_has_waiters(&so->so_rcv.sb_cv));
675: KASSERT(!cv_has_waiters(&so->so_snd.sb_cv));
1.1 cgd 676: sorflush(so);
1.161 ad 677: refs = so->so_aborting; /* XXX */
1.177 ad 678: /* Remove acccept filter if one is present. */
1.170 tls 679: if (so->so_accf != NULL)
1.177 ad 680: (void)accept_filt_clear(so);
1.160 ad 681: sounlock(so);
1.161 ad 682: if (refs == 0) /* XXX */
683: soput(so);
1.1 cgd 684: }
685:
686: /*
687: * Close a socket on last file table reference removal.
688: * Initiate disconnect if connected.
689: * Free socket when disconnect complete.
690: */
1.3 andrew 691: int
1.54 lukem 692: soclose(struct socket *so)
1.1 cgd 693: {
1.54 lukem 694: struct socket *so2;
1.160 ad 695: int error;
696: int error2;
1.1 cgd 697:
1.54 lukem 698: error = 0;
1.160 ad 699: solock(so);
1.1 cgd 700: if (so->so_options & SO_ACCEPTCONN) {
1.172 ad 701: for (;;) {
702: if ((so2 = TAILQ_FIRST(&so->so_q0)) != 0) {
1.160 ad 703: KASSERT(solocked2(so, so2));
704: (void) soqremque(so2, 0);
705: /* soabort drops the lock. */
706: (void) soabort(so2);
707: solock(so);
1.172 ad 708: continue;
1.160 ad 709: }
1.172 ad 710: if ((so2 = TAILQ_FIRST(&so->so_q)) != 0) {
1.160 ad 711: KASSERT(solocked2(so, so2));
712: (void) soqremque(so2, 1);
713: /* soabort drops the lock. */
714: (void) soabort(so2);
715: solock(so);
1.172 ad 716: continue;
1.160 ad 717: }
1.172 ad 718: break;
719: }
1.1 cgd 720: }
721: if (so->so_pcb == 0)
722: goto discard;
723: if (so->so_state & SS_ISCONNECTED) {
724: if ((so->so_state & SS_ISDISCONNECTING) == 0) {
725: error = sodisconnect(so);
726: if (error)
727: goto drop;
728: }
729: if (so->so_options & SO_LINGER) {
1.206 christos 730: if ((so->so_state & (SS_ISDISCONNECTING|SS_NBIO)) ==
731: (SS_ISDISCONNECTING|SS_NBIO))
1.1 cgd 732: goto drop;
1.21 christos 733: while (so->so_state & SS_ISCONNECTED) {
1.185 yamt 734: error = sowait(so, true, so->so_linger * hz);
1.21 christos 735: if (error)
1.1 cgd 736: break;
1.21 christos 737: }
1.1 cgd 738: }
739: }
1.54 lukem 740: drop:
1.1 cgd 741: if (so->so_pcb) {
1.160 ad 742: error2 = (*so->so_proto->pr_usrreq)(so, PRU_DETACH,
1.140 dyoung 743: NULL, NULL, NULL, NULL);
1.1 cgd 744: if (error == 0)
745: error = error2;
746: }
1.54 lukem 747: discard:
1.1 cgd 748: if (so->so_state & SS_NOFDREF)
749: panic("soclose: NOFDREF");
1.198 elad 750: kauth_cred_free(so->so_cred);
1.1 cgd 751: so->so_state |= SS_NOFDREF;
752: sofree(so);
753: return (error);
754: }
755:
756: /*
1.160 ad 757: * Must be called with the socket locked.. Will return with it unlocked.
1.1 cgd 758: */
1.3 andrew 759: int
1.54 lukem 760: soabort(struct socket *so)
1.1 cgd 761: {
1.161 ad 762: u_int refs;
1.139 yamt 763: int error;
1.160 ad 764:
765: KASSERT(solocked(so));
766: KASSERT(so->so_head == NULL);
1.1 cgd 767:
1.161 ad 768: so->so_aborting++; /* XXX */
1.140 dyoung 769: error = (*so->so_proto->pr_usrreq)(so, PRU_ABORT, NULL,
770: NULL, NULL, NULL);
1.161 ad 771: refs = --so->so_aborting; /* XXX */
1.164 drochner 772: if (error || (refs == 0)) {
1.139 yamt 773: sofree(so);
1.160 ad 774: } else {
775: sounlock(so);
1.139 yamt 776: }
777: return error;
1.1 cgd 778: }
779:
1.3 andrew 780: int
1.54 lukem 781: soaccept(struct socket *so, struct mbuf *nam)
1.1 cgd 782: {
1.160 ad 783: int error;
784:
785: KASSERT(solocked(so));
1.1 cgd 786:
1.54 lukem 787: error = 0;
1.1 cgd 788: if ((so->so_state & SS_NOFDREF) == 0)
789: panic("soaccept: !NOFDREF");
790: so->so_state &= ~SS_NOFDREF;
1.55 thorpej 791: if ((so->so_state & SS_ISDISCONNECTED) == 0 ||
792: (so->so_proto->pr_flags & PR_ABRTACPTDIS) == 0)
1.41 mycroft 793: error = (*so->so_proto->pr_usrreq)(so, PRU_ACCEPT,
1.140 dyoung 794: NULL, nam, NULL, NULL);
1.41 mycroft 795: else
1.53 itojun 796: error = ECONNABORTED;
1.52 itojun 797:
1.1 cgd 798: return (error);
799: }
800:
1.3 andrew 801: int
1.114 christos 802: soconnect(struct socket *so, struct mbuf *nam, struct lwp *l)
1.1 cgd 803: {
1.160 ad 804: int error;
805:
806: KASSERT(solocked(so));
1.1 cgd 807:
808: if (so->so_options & SO_ACCEPTCONN)
809: return (EOPNOTSUPP);
810: /*
811: * If protocol is connection-based, can only connect once.
812: * Otherwise, if connected, try to disconnect first.
813: * This allows user to disconnect by connecting to, e.g.,
814: * a null address.
815: */
816: if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
817: ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
818: (error = sodisconnect(so))))
819: error = EISCONN;
820: else
821: error = (*so->so_proto->pr_usrreq)(so, PRU_CONNECT,
1.140 dyoung 822: NULL, nam, NULL, l);
1.1 cgd 823: return (error);
824: }
825:
1.3 andrew 826: int
1.54 lukem 827: soconnect2(struct socket *so1, struct socket *so2)
1.1 cgd 828: {
1.160 ad 829: int error;
830:
831: KASSERT(solocked2(so1, so2));
1.1 cgd 832:
1.22 mycroft 833: error = (*so1->so_proto->pr_usrreq)(so1, PRU_CONNECT2,
1.140 dyoung 834: NULL, (struct mbuf *)so2, NULL, NULL);
1.1 cgd 835: return (error);
836: }
837:
1.3 andrew 838: int
1.54 lukem 839: sodisconnect(struct socket *so)
1.1 cgd 840: {
1.160 ad 841: int error;
842:
843: KASSERT(solocked(so));
1.1 cgd 844:
845: if ((so->so_state & SS_ISCONNECTED) == 0) {
846: error = ENOTCONN;
1.160 ad 847: } else if (so->so_state & SS_ISDISCONNECTING) {
1.1 cgd 848: error = EALREADY;
1.160 ad 849: } else {
850: error = (*so->so_proto->pr_usrreq)(so, PRU_DISCONNECT,
851: NULL, NULL, NULL, NULL);
1.1 cgd 852: }
853: return (error);
854: }
855:
1.15 mycroft 856: #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK)
1.1 cgd 857: /*
858: * Send on a socket.
859: * If send must go all at once and message is larger than
860: * send buffering, then hard error.
861: * Lock against other senders.
862: * If must go all at once and not enough room now, then
863: * inform user that this would block and do nothing.
864: * Otherwise, if nonblocking, send as much as possible.
865: * The data to be sent is described by "uio" if nonzero,
866: * otherwise by the mbuf chain "top" (which must be null
867: * if uio is not). Data provided in mbuf chain must be small
868: * enough to send all at once.
869: *
870: * Returns nonzero on error, timeout or signal; callers
871: * must check for short counts if EINTR/ERESTART are returned.
872: * Data and control buffers are freed on return.
873: */
1.3 andrew 874: int
1.54 lukem 875: sosend(struct socket *so, struct mbuf *addr, struct uio *uio, struct mbuf *top,
1.114 christos 876: struct mbuf *control, int flags, struct lwp *l)
1.1 cgd 877: {
1.54 lukem 878: struct mbuf **mp, *m;
1.114 christos 879: struct proc *p;
1.58 jdolecek 880: long space, len, resid, clen, mlen;
881: int error, s, dontroute, atomic;
1.196 dsl 882: short wakeup_state = 0;
1.54 lukem 883:
1.114 christos 884: p = l->l_proc;
1.160 ad 885: clen = 0;
1.64 thorpej 886:
1.160 ad 887: /*
888: * solock() provides atomicity of access. splsoftnet() prevents
889: * protocol processing soft interrupts from interrupting us and
890: * blocking (expensive).
891: */
892: s = splsoftnet();
893: solock(so);
1.54 lukem 894: atomic = sosendallatonce(so) || top;
1.1 cgd 895: if (uio)
896: resid = uio->uio_resid;
897: else
898: resid = top->m_pkthdr.len;
1.7 cgd 899: /*
900: * In theory resid should be unsigned.
901: * However, space must be signed, as it might be less than 0
902: * if we over-committed, and we must use a signed comparison
903: * of space and resid. On the other hand, a negative resid
904: * causes us to loop sending 0-length segments to the protocol.
905: */
1.29 mycroft 906: if (resid < 0) {
907: error = EINVAL;
908: goto out;
909: }
1.1 cgd 910: dontroute =
911: (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
912: (so->so_proto->pr_flags & PR_ATOMIC);
1.165 christos 913: l->l_ru.ru_msgsnd++;
1.1 cgd 914: if (control)
915: clen = control->m_len;
1.54 lukem 916: restart:
1.21 christos 917: if ((error = sblock(&so->so_snd, SBLOCKWAIT(flags))) != 0)
1.1 cgd 918: goto out;
919: do {
1.160 ad 920: if (so->so_state & SS_CANTSENDMORE) {
921: error = EPIPE;
922: goto release;
923: }
1.48 thorpej 924: if (so->so_error) {
925: error = so->so_error;
926: so->so_error = 0;
927: goto release;
928: }
1.1 cgd 929: if ((so->so_state & SS_ISCONNECTED) == 0) {
930: if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
931: if ((so->so_state & SS_ISCONFIRMING) == 0 &&
1.160 ad 932: !(resid == 0 && clen != 0)) {
933: error = ENOTCONN;
934: goto release;
935: }
936: } else if (addr == 0) {
937: error = EDESTADDRREQ;
938: goto release;
939: }
1.1 cgd 940: }
941: space = sbspace(&so->so_snd);
942: if (flags & MSG_OOB)
943: space += 1024;
1.21 christos 944: if ((atomic && resid > so->so_snd.sb_hiwat) ||
1.160 ad 945: clen > so->so_snd.sb_hiwat) {
946: error = EMSGSIZE;
947: goto release;
948: }
1.96 mycroft 949: if (space < resid + clen &&
1.1 cgd 950: (atomic || space < so->so_snd.sb_lowat || space < clen)) {
1.206 christos 951: if ((so->so_state & SS_NBIO) || (flags & MSG_NBIO)) {
1.160 ad 952: error = EWOULDBLOCK;
953: goto release;
954: }
1.1 cgd 955: sbunlock(&so->so_snd);
1.196 dsl 956: if (wakeup_state & SS_RESTARTSYS) {
957: error = ERESTART;
958: goto out;
959: }
1.1 cgd 960: error = sbwait(&so->so_snd);
961: if (error)
962: goto out;
1.196 dsl 963: wakeup_state = so->so_state;
1.1 cgd 964: goto restart;
965: }
1.196 dsl 966: wakeup_state = 0;
1.1 cgd 967: mp = ⊤
968: space -= clen;
969: do {
1.45 tv 970: if (uio == NULL) {
971: /*
972: * Data is prepackaged in "top".
973: */
974: resid = 0;
975: if (flags & MSG_EOR)
976: top->m_flags |= M_EOR;
977: } else do {
1.160 ad 978: sounlock(so);
979: splx(s);
1.144 dyoung 980: if (top == NULL) {
1.78 matt 981: m = m_gethdr(M_WAIT, MT_DATA);
1.45 tv 982: mlen = MHLEN;
983: m->m_pkthdr.len = 0;
1.140 dyoung 984: m->m_pkthdr.rcvif = NULL;
1.45 tv 985: } else {
1.78 matt 986: m = m_get(M_WAIT, MT_DATA);
1.45 tv 987: mlen = MLEN;
988: }
1.78 matt 989: MCLAIM(m, so->so_snd.sb_mowner);
1.121 yamt 990: if (sock_loan_thresh >= 0 &&
991: uio->uio_iov->iov_len >= sock_loan_thresh &&
992: space >= sock_loan_thresh &&
1.64 thorpej 993: (len = sosend_loan(so, uio, m,
994: space)) != 0) {
995: SOSEND_COUNTER_INCR(&sosend_loan_big);
996: space -= len;
997: goto have_data;
998: }
1.45 tv 999: if (resid >= MINCLSIZE && space >= MCLBYTES) {
1.64 thorpej 1000: SOSEND_COUNTER_INCR(&sosend_copy_big);
1.201 oki 1001: m_clget(m, M_DONTWAIT);
1.45 tv 1002: if ((m->m_flags & M_EXT) == 0)
1003: goto nopages;
1004: mlen = MCLBYTES;
1005: if (atomic && top == 0) {
1.58 jdolecek 1006: len = lmin(MCLBYTES - max_hdr,
1.54 lukem 1007: resid);
1.45 tv 1008: m->m_data += max_hdr;
1009: } else
1.58 jdolecek 1010: len = lmin(MCLBYTES, resid);
1.45 tv 1011: space -= len;
1012: } else {
1.64 thorpej 1013: nopages:
1014: SOSEND_COUNTER_INCR(&sosend_copy_small);
1.58 jdolecek 1015: len = lmin(lmin(mlen, resid), space);
1.45 tv 1016: space -= len;
1017: /*
1018: * For datagram protocols, leave room
1019: * for protocol headers in first mbuf.
1020: */
1021: if (atomic && top == 0 && len < mlen)
1022: MH_ALIGN(m, len);
1023: }
1.144 dyoung 1024: error = uiomove(mtod(m, void *), (int)len, uio);
1.64 thorpej 1025: have_data:
1.45 tv 1026: resid = uio->uio_resid;
1027: m->m_len = len;
1028: *mp = m;
1029: top->m_pkthdr.len += len;
1.160 ad 1030: s = splsoftnet();
1031: solock(so);
1.144 dyoung 1032: if (error != 0)
1.45 tv 1033: goto release;
1034: mp = &m->m_next;
1035: if (resid <= 0) {
1036: if (flags & MSG_EOR)
1037: top->m_flags |= M_EOR;
1038: break;
1039: }
1040: } while (space > 0 && atomic);
1.108 perry 1041:
1.160 ad 1042: if (so->so_state & SS_CANTSENDMORE) {
1043: error = EPIPE;
1044: goto release;
1045: }
1.45 tv 1046: if (dontroute)
1047: so->so_options |= SO_DONTROUTE;
1048: if (resid > 0)
1049: so->so_state |= SS_MORETOCOME;
1.46 sommerfe 1050: error = (*so->so_proto->pr_usrreq)(so,
1051: (flags & MSG_OOB) ? PRU_SENDOOB : PRU_SEND,
1.160 ad 1052: top, addr, control, curlwp);
1.45 tv 1053: if (dontroute)
1054: so->so_options &= ~SO_DONTROUTE;
1055: if (resid > 0)
1056: so->so_state &= ~SS_MORETOCOME;
1057: clen = 0;
1.144 dyoung 1058: control = NULL;
1059: top = NULL;
1.45 tv 1060: mp = ⊤
1.144 dyoung 1061: if (error != 0)
1.1 cgd 1062: goto release;
1063: } while (resid && space > 0);
1064: } while (resid);
1065:
1.54 lukem 1066: release:
1.1 cgd 1067: sbunlock(&so->so_snd);
1.54 lukem 1068: out:
1.160 ad 1069: sounlock(so);
1070: splx(s);
1.1 cgd 1071: if (top)
1072: m_freem(top);
1073: if (control)
1074: m_freem(control);
1075: return (error);
1076: }
1077:
1078: /*
1.159 ad 1079: * Following replacement or removal of the first mbuf on the first
1080: * mbuf chain of a socket buffer, push necessary state changes back
1081: * into the socket buffer so that other consumers see the values
1082: * consistently. 'nextrecord' is the callers locally stored value of
1083: * the original value of sb->sb_mb->m_nextpkt which must be restored
1084: * when the lead mbuf changes. NOTE: 'nextrecord' may be NULL.
1085: */
1086: static void
1087: sbsync(struct sockbuf *sb, struct mbuf *nextrecord)
1088: {
1089:
1.160 ad 1090: KASSERT(solocked(sb->sb_so));
1091:
1.159 ad 1092: /*
1093: * First, update for the new value of nextrecord. If necessary,
1094: * make it the first record.
1095: */
1096: if (sb->sb_mb != NULL)
1097: sb->sb_mb->m_nextpkt = nextrecord;
1098: else
1099: sb->sb_mb = nextrecord;
1100:
1101: /*
1102: * Now update any dependent socket buffer fields to reflect
1103: * the new state. This is an inline of SB_EMPTY_FIXUP, with
1104: * the addition of a second clause that takes care of the
1105: * case where sb_mb has been updated, but remains the last
1106: * record.
1107: */
1108: if (sb->sb_mb == NULL) {
1109: sb->sb_mbtail = NULL;
1110: sb->sb_lastrecord = NULL;
1111: } else if (sb->sb_mb->m_nextpkt == NULL)
1112: sb->sb_lastrecord = sb->sb_mb;
1113: }
1114:
1115: /*
1.1 cgd 1116: * Implement receive operations on a socket.
1117: * We depend on the way that records are added to the sockbuf
1118: * by sbappend*. In particular, each record (mbufs linked through m_next)
1119: * must begin with an address if the protocol so specifies,
1120: * followed by an optional mbuf or mbufs containing ancillary data,
1121: * and then zero or more mbufs of data.
1122: * In order to avoid blocking network interrupts for the entire time here,
1123: * we splx() while doing the actual copy to user space.
1124: * Although the sockbuf is locked, new data may still be appended,
1125: * and thus we must maintain consistency of the sockbuf during that time.
1126: *
1127: * The caller may receive the data as a single mbuf chain by supplying
1128: * an mbuf **mp0 for use in returning the chain. The uio is then used
1129: * only for the count in uio_resid.
1130: */
1.3 andrew 1131: int
1.54 lukem 1132: soreceive(struct socket *so, struct mbuf **paddr, struct uio *uio,
1133: struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
1.1 cgd 1134: {
1.116 yamt 1135: struct lwp *l = curlwp;
1.160 ad 1136: struct mbuf *m, **mp, *mt;
1.209.2.1 riz 1137: size_t len, offset, moff, orig_resid;
1138: int atomic, flags, error, s, type;
1.99 matt 1139: const struct protosw *pr;
1.54 lukem 1140: struct mbuf *nextrecord;
1.67 he 1141: int mbuf_removed = 0;
1.146 dyoung 1142: const struct domain *dom;
1.196 dsl 1143: short wakeup_state = 0;
1.64 thorpej 1144:
1.54 lukem 1145: pr = so->so_proto;
1.146 dyoung 1146: atomic = pr->pr_flags & PR_ATOMIC;
1147: dom = pr->pr_domain;
1.1 cgd 1148: mp = mp0;
1.54 lukem 1149: type = 0;
1150: orig_resid = uio->uio_resid;
1.102 jonathan 1151:
1.144 dyoung 1152: if (paddr != NULL)
1153: *paddr = NULL;
1154: if (controlp != NULL)
1155: *controlp = NULL;
1156: if (flagsp != NULL)
1.1 cgd 1157: flags = *flagsp &~ MSG_EOR;
1158: else
1159: flags = 0;
1.66 enami 1160:
1.1 cgd 1161: if (flags & MSG_OOB) {
1162: m = m_get(M_WAIT, MT_DATA);
1.160 ad 1163: solock(so);
1.17 cgd 1164: error = (*pr->pr_usrreq)(so, PRU_RCVOOB, m,
1.140 dyoung 1165: (struct mbuf *)(long)(flags & MSG_PEEK), NULL, l);
1.160 ad 1166: sounlock(so);
1.1 cgd 1167: if (error)
1168: goto bad;
1169: do {
1.134 christos 1170: error = uiomove(mtod(m, void *),
1.209.2.1 riz 1171: MIN(uio->uio_resid, m->m_len), uio);
1.1 cgd 1172: m = m_free(m);
1.144 dyoung 1173: } while (uio->uio_resid > 0 && error == 0 && m);
1.54 lukem 1174: bad:
1.144 dyoung 1175: if (m != NULL)
1.1 cgd 1176: m_freem(m);
1.144 dyoung 1177: return error;
1.1 cgd 1178: }
1.144 dyoung 1179: if (mp != NULL)
1.140 dyoung 1180: *mp = NULL;
1.160 ad 1181:
1182: /*
1183: * solock() provides atomicity of access. splsoftnet() prevents
1184: * protocol processing soft interrupts from interrupting us and
1185: * blocking (expensive).
1186: */
1187: s = splsoftnet();
1188: solock(so);
1.1 cgd 1189: if (so->so_state & SS_ISCONFIRMING && uio->uio_resid)
1.140 dyoung 1190: (*pr->pr_usrreq)(so, PRU_RCVD, NULL, NULL, NULL, l);
1.1 cgd 1191:
1.54 lukem 1192: restart:
1.160 ad 1193: if ((error = sblock(&so->so_rcv, SBLOCKWAIT(flags))) != 0) {
1194: sounlock(so);
1195: splx(s);
1.144 dyoung 1196: return error;
1.160 ad 1197: }
1.1 cgd 1198:
1199: m = so->so_rcv.sb_mb;
1200: /*
1201: * If we have less data than requested, block awaiting more
1202: * (subject to any timeout) if:
1.15 mycroft 1203: * 1. the current count is less than the low water mark,
1.1 cgd 1204: * 2. MSG_WAITALL is set, and it is possible to do the entire
1.15 mycroft 1205: * receive operation at once if we block (resid <= hiwat), or
1206: * 3. MSG_DONTWAIT is not set.
1.1 cgd 1207: * If MSG_WAITALL is set but resid is larger than the receive buffer,
1208: * we have to do the receive in sections, and thus risk returning
1209: * a short count if a timeout or signal occurs after we start.
1210: */
1.144 dyoung 1211: if (m == NULL ||
1212: ((flags & MSG_DONTWAIT) == 0 &&
1213: so->so_rcv.sb_cc < uio->uio_resid &&
1214: (so->so_rcv.sb_cc < so->so_rcv.sb_lowat ||
1215: ((flags & MSG_WAITALL) &&
1216: uio->uio_resid <= so->so_rcv.sb_hiwat)) &&
1.146 dyoung 1217: m->m_nextpkt == NULL && !atomic)) {
1.1 cgd 1218: #ifdef DIAGNOSTIC
1.144 dyoung 1219: if (m == NULL && so->so_rcv.sb_cc)
1.1 cgd 1220: panic("receive 1");
1221: #endif
1222: if (so->so_error) {
1.144 dyoung 1223: if (m != NULL)
1.15 mycroft 1224: goto dontblock;
1.1 cgd 1225: error = so->so_error;
1226: if ((flags & MSG_PEEK) == 0)
1227: so->so_error = 0;
1228: goto release;
1229: }
1230: if (so->so_state & SS_CANTRCVMORE) {
1.144 dyoung 1231: if (m != NULL)
1.15 mycroft 1232: goto dontblock;
1.1 cgd 1233: else
1234: goto release;
1235: }
1.144 dyoung 1236: for (; m != NULL; m = m->m_next)
1.1 cgd 1237: if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) {
1238: m = so->so_rcv.sb_mb;
1239: goto dontblock;
1240: }
1241: if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
1242: (so->so_proto->pr_flags & PR_CONNREQUIRED)) {
1243: error = ENOTCONN;
1244: goto release;
1245: }
1246: if (uio->uio_resid == 0)
1247: goto release;
1.206 christos 1248: if ((so->so_state & SS_NBIO) ||
1249: (flags & (MSG_DONTWAIT|MSG_NBIO))) {
1.1 cgd 1250: error = EWOULDBLOCK;
1251: goto release;
1252: }
1.69 thorpej 1253: SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 1");
1254: SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 1");
1.1 cgd 1255: sbunlock(&so->so_rcv);
1.196 dsl 1256: if (wakeup_state & SS_RESTARTSYS)
1257: error = ERESTART;
1258: else
1259: error = sbwait(&so->so_rcv);
1.160 ad 1260: if (error != 0) {
1261: sounlock(so);
1262: splx(s);
1.144 dyoung 1263: return error;
1.160 ad 1264: }
1.196 dsl 1265: wakeup_state = so->so_state;
1.1 cgd 1266: goto restart;
1267: }
1.54 lukem 1268: dontblock:
1.69 thorpej 1269: /*
1270: * On entry here, m points to the first record of the socket buffer.
1.159 ad 1271: * From this point onward, we maintain 'nextrecord' as a cache of the
1272: * pointer to the next record in the socket buffer. We must keep the
1273: * various socket buffer pointers and local stack versions of the
1274: * pointers in sync, pushing out modifications before dropping the
1.160 ad 1275: * socket lock, and re-reading them when picking it up.
1.159 ad 1276: *
1277: * Otherwise, we will race with the network stack appending new data
1278: * or records onto the socket buffer by using inconsistent/stale
1279: * versions of the field, possibly resulting in socket buffer
1280: * corruption.
1281: *
1282: * By holding the high-level sblock(), we prevent simultaneous
1283: * readers from pulling off the front of the socket buffer.
1.69 thorpej 1284: */
1.144 dyoung 1285: if (l != NULL)
1.157 ad 1286: l->l_ru.ru_msgrcv++;
1.69 thorpej 1287: KASSERT(m == so->so_rcv.sb_mb);
1288: SBLASTRECORDCHK(&so->so_rcv, "soreceive 1");
1289: SBLASTMBUFCHK(&so->so_rcv, "soreceive 1");
1.1 cgd 1290: nextrecord = m->m_nextpkt;
1291: if (pr->pr_flags & PR_ADDR) {
1292: #ifdef DIAGNOSTIC
1293: if (m->m_type != MT_SONAME)
1294: panic("receive 1a");
1295: #endif
1.3 andrew 1296: orig_resid = 0;
1.1 cgd 1297: if (flags & MSG_PEEK) {
1298: if (paddr)
1299: *paddr = m_copy(m, 0, m->m_len);
1300: m = m->m_next;
1301: } else {
1302: sbfree(&so->so_rcv, m);
1.67 he 1303: mbuf_removed = 1;
1.144 dyoung 1304: if (paddr != NULL) {
1.1 cgd 1305: *paddr = m;
1306: so->so_rcv.sb_mb = m->m_next;
1.144 dyoung 1307: m->m_next = NULL;
1.1 cgd 1308: m = so->so_rcv.sb_mb;
1309: } else {
1310: MFREE(m, so->so_rcv.sb_mb);
1311: m = so->so_rcv.sb_mb;
1312: }
1.159 ad 1313: sbsync(&so->so_rcv, nextrecord);
1.1 cgd 1314: }
1315: }
1.159 ad 1316:
1317: /*
1318: * Process one or more MT_CONTROL mbufs present before any data mbufs
1319: * in the first mbuf chain on the socket buffer. If MSG_PEEK, we
1320: * just copy the data; if !MSG_PEEK, we call into the protocol to
1321: * perform externalization (or freeing if controlp == NULL).
1322: */
1323: if (__predict_false(m != NULL && m->m_type == MT_CONTROL)) {
1324: struct mbuf *cm = NULL, *cmn;
1325: struct mbuf **cme = &cm;
1326:
1327: do {
1328: if (flags & MSG_PEEK) {
1329: if (controlp != NULL) {
1330: *controlp = m_copy(m, 0, m->m_len);
1331: controlp = &(*controlp)->m_next;
1332: }
1333: m = m->m_next;
1334: } else {
1335: sbfree(&so->so_rcv, m);
1.1 cgd 1336: so->so_rcv.sb_mb = m->m_next;
1.144 dyoung 1337: m->m_next = NULL;
1.159 ad 1338: *cme = m;
1339: cme = &(*cme)->m_next;
1.1 cgd 1340: m = so->so_rcv.sb_mb;
1.159 ad 1341: }
1342: } while (m != NULL && m->m_type == MT_CONTROL);
1343: if ((flags & MSG_PEEK) == 0)
1344: sbsync(&so->so_rcv, nextrecord);
1345: for (; cm != NULL; cm = cmn) {
1346: cmn = cm->m_next;
1347: cm->m_next = NULL;
1348: type = mtod(cm, struct cmsghdr *)->cmsg_type;
1349: if (controlp != NULL) {
1350: if (dom->dom_externalize != NULL &&
1351: type == SCM_RIGHTS) {
1.160 ad 1352: sounlock(so);
1.159 ad 1353: splx(s);
1.204 christos 1354: error = (*dom->dom_externalize)(cm, l,
1355: (flags & MSG_CMSG_CLOEXEC) ?
1356: O_CLOEXEC : 0);
1.159 ad 1357: s = splsoftnet();
1.160 ad 1358: solock(so);
1.159 ad 1359: }
1360: *controlp = cm;
1361: while (*controlp != NULL)
1362: controlp = &(*controlp)->m_next;
1.1 cgd 1363: } else {
1.106 itojun 1364: /*
1365: * Dispose of any SCM_RIGHTS message that went
1366: * through the read path rather than recv.
1367: */
1.159 ad 1368: if (dom->dom_dispose != NULL &&
1369: type == SCM_RIGHTS) {
1.160 ad 1370: sounlock(so);
1.159 ad 1371: (*dom->dom_dispose)(cm);
1.160 ad 1372: solock(so);
1.159 ad 1373: }
1374: m_freem(cm);
1.1 cgd 1375: }
1376: }
1.159 ad 1377: if (m != NULL)
1378: nextrecord = so->so_rcv.sb_mb->m_nextpkt;
1379: else
1380: nextrecord = so->so_rcv.sb_mb;
1381: orig_resid = 0;
1.1 cgd 1382: }
1.69 thorpej 1383:
1.159 ad 1384: /* If m is non-NULL, we have some data to read. */
1385: if (__predict_true(m != NULL)) {
1.1 cgd 1386: type = m->m_type;
1387: if (type == MT_OOBDATA)
1388: flags |= MSG_OOB;
1389: }
1.69 thorpej 1390: SBLASTRECORDCHK(&so->so_rcv, "soreceive 2");
1391: SBLASTMBUFCHK(&so->so_rcv, "soreceive 2");
1392:
1.1 cgd 1393: moff = 0;
1394: offset = 0;
1.144 dyoung 1395: while (m != NULL && uio->uio_resid > 0 && error == 0) {
1.1 cgd 1396: if (m->m_type == MT_OOBDATA) {
1397: if (type != MT_OOBDATA)
1398: break;
1399: } else if (type == MT_OOBDATA)
1400: break;
1401: #ifdef DIAGNOSTIC
1402: else if (m->m_type != MT_DATA && m->m_type != MT_HEADER)
1403: panic("receive 3");
1404: #endif
1405: so->so_state &= ~SS_RCVATMARK;
1.196 dsl 1406: wakeup_state = 0;
1.1 cgd 1407: len = uio->uio_resid;
1408: if (so->so_oobmark && len > so->so_oobmark - offset)
1409: len = so->so_oobmark - offset;
1410: if (len > m->m_len - moff)
1411: len = m->m_len - moff;
1412: /*
1413: * If mp is set, just pass back the mbufs.
1414: * Otherwise copy them out via the uio, then free.
1415: * Sockbuf must be consistent here (points to current mbuf,
1416: * it points to next record) when we drop priority;
1417: * we must note any additions to the sockbuf when we
1418: * block interrupts again.
1419: */
1.144 dyoung 1420: if (mp == NULL) {
1.69 thorpej 1421: SBLASTRECORDCHK(&so->so_rcv, "soreceive uiomove");
1422: SBLASTMBUFCHK(&so->so_rcv, "soreceive uiomove");
1.160 ad 1423: sounlock(so);
1.1 cgd 1424: splx(s);
1.209.2.1 riz 1425: error = uiomove(mtod(m, char *) + moff, len, uio);
1.20 mycroft 1426: s = splsoftnet();
1.160 ad 1427: solock(so);
1.144 dyoung 1428: if (error != 0) {
1.67 he 1429: /*
1430: * If any part of the record has been removed
1431: * (such as the MT_SONAME mbuf, which will
1432: * happen when PR_ADDR, and thus also
1433: * PR_ATOMIC, is set), then drop the entire
1434: * record to maintain the atomicity of the
1435: * receive operation.
1436: *
1437: * This avoids a later panic("receive 1a")
1438: * when compiled with DIAGNOSTIC.
1439: */
1.146 dyoung 1440: if (m && mbuf_removed && atomic)
1.67 he 1441: (void) sbdroprecord(&so->so_rcv);
1442:
1.57 jdolecek 1443: goto release;
1.67 he 1444: }
1.1 cgd 1445: } else
1446: uio->uio_resid -= len;
1447: if (len == m->m_len - moff) {
1448: if (m->m_flags & M_EOR)
1449: flags |= MSG_EOR;
1450: if (flags & MSG_PEEK) {
1451: m = m->m_next;
1452: moff = 0;
1453: } else {
1454: nextrecord = m->m_nextpkt;
1455: sbfree(&so->so_rcv, m);
1456: if (mp) {
1457: *mp = m;
1458: mp = &m->m_next;
1459: so->so_rcv.sb_mb = m = m->m_next;
1.140 dyoung 1460: *mp = NULL;
1.1 cgd 1461: } else {
1462: MFREE(m, so->so_rcv.sb_mb);
1463: m = so->so_rcv.sb_mb;
1464: }
1.69 thorpej 1465: /*
1466: * If m != NULL, we also know that
1467: * so->so_rcv.sb_mb != NULL.
1468: */
1469: KASSERT(so->so_rcv.sb_mb == m);
1470: if (m) {
1.1 cgd 1471: m->m_nextpkt = nextrecord;
1.69 thorpej 1472: if (nextrecord == NULL)
1473: so->so_rcv.sb_lastrecord = m;
1474: } else {
1475: so->so_rcv.sb_mb = nextrecord;
1.70 thorpej 1476: SB_EMPTY_FIXUP(&so->so_rcv);
1.69 thorpej 1477: }
1478: SBLASTRECORDCHK(&so->so_rcv, "soreceive 3");
1479: SBLASTMBUFCHK(&so->so_rcv, "soreceive 3");
1.1 cgd 1480: }
1.144 dyoung 1481: } else if (flags & MSG_PEEK)
1482: moff += len;
1483: else {
1.160 ad 1484: if (mp != NULL) {
1485: mt = m_copym(m, 0, len, M_NOWAIT);
1486: if (__predict_false(mt == NULL)) {
1487: sounlock(so);
1488: mt = m_copym(m, 0, len, M_WAIT);
1489: solock(so);
1490: }
1491: *mp = mt;
1492: }
1.144 dyoung 1493: m->m_data += len;
1494: m->m_len -= len;
1495: so->so_rcv.sb_cc -= len;
1.1 cgd 1496: }
1497: if (so->so_oobmark) {
1498: if ((flags & MSG_PEEK) == 0) {
1499: so->so_oobmark -= len;
1500: if (so->so_oobmark == 0) {
1501: so->so_state |= SS_RCVATMARK;
1502: break;
1503: }
1.7 cgd 1504: } else {
1.1 cgd 1505: offset += len;
1.7 cgd 1506: if (offset == so->so_oobmark)
1507: break;
1508: }
1.1 cgd 1509: }
1510: if (flags & MSG_EOR)
1511: break;
1512: /*
1513: * If the MSG_WAITALL flag is set (for non-atomic socket),
1514: * we must not quit until "uio->uio_resid == 0" or an error
1515: * termination. If a signal/timeout occurs, return
1516: * with a short count but without error.
1517: * Keep sockbuf locked against other readers.
1518: */
1.144 dyoung 1519: while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 &&
1.3 andrew 1520: !sosendallatonce(so) && !nextrecord) {
1.1 cgd 1521: if (so->so_error || so->so_state & SS_CANTRCVMORE)
1522: break;
1.68 matt 1523: /*
1524: * If we are peeking and the socket receive buffer is
1525: * full, stop since we can't get more data to peek at.
1526: */
1527: if ((flags & MSG_PEEK) && sbspace(&so->so_rcv) <= 0)
1528: break;
1529: /*
1530: * If we've drained the socket buffer, tell the
1531: * protocol in case it needs to do something to
1532: * get it filled again.
1533: */
1534: if ((pr->pr_flags & PR_WANTRCVD) && so->so_pcb)
1535: (*pr->pr_usrreq)(so, PRU_RCVD,
1.140 dyoung 1536: NULL, (struct mbuf *)(long)flags, NULL, l);
1.69 thorpej 1537: SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 2");
1538: SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 2");
1.196 dsl 1539: if (wakeup_state & SS_RESTARTSYS)
1540: error = ERESTART;
1541: else
1542: error = sbwait(&so->so_rcv);
1.144 dyoung 1543: if (error != 0) {
1.1 cgd 1544: sbunlock(&so->so_rcv);
1.160 ad 1545: sounlock(so);
1.1 cgd 1546: splx(s);
1.144 dyoung 1547: return 0;
1.1 cgd 1548: }
1.21 christos 1549: if ((m = so->so_rcv.sb_mb) != NULL)
1.1 cgd 1550: nextrecord = m->m_nextpkt;
1.196 dsl 1551: wakeup_state = so->so_state;
1.1 cgd 1552: }
1553: }
1.3 andrew 1554:
1.146 dyoung 1555: if (m && atomic) {
1.3 andrew 1556: flags |= MSG_TRUNC;
1557: if ((flags & MSG_PEEK) == 0)
1558: (void) sbdroprecord(&so->so_rcv);
1559: }
1.1 cgd 1560: if ((flags & MSG_PEEK) == 0) {
1.144 dyoung 1561: if (m == NULL) {
1.69 thorpej 1562: /*
1.70 thorpej 1563: * First part is an inline SB_EMPTY_FIXUP(). Second
1.69 thorpej 1564: * part makes sure sb_lastrecord is up-to-date if
1565: * there is still data in the socket buffer.
1566: */
1.1 cgd 1567: so->so_rcv.sb_mb = nextrecord;
1.69 thorpej 1568: if (so->so_rcv.sb_mb == NULL) {
1569: so->so_rcv.sb_mbtail = NULL;
1570: so->so_rcv.sb_lastrecord = NULL;
1571: } else if (nextrecord->m_nextpkt == NULL)
1572: so->so_rcv.sb_lastrecord = nextrecord;
1573: }
1574: SBLASTRECORDCHK(&so->so_rcv, "soreceive 4");
1575: SBLASTMBUFCHK(&so->so_rcv, "soreceive 4");
1.1 cgd 1576: if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
1.140 dyoung 1577: (*pr->pr_usrreq)(so, PRU_RCVD, NULL,
1578: (struct mbuf *)(long)flags, NULL, l);
1.1 cgd 1579: }
1.3 andrew 1580: if (orig_resid == uio->uio_resid && orig_resid &&
1581: (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) {
1582: sbunlock(&so->so_rcv);
1583: goto restart;
1584: }
1.108 perry 1585:
1.144 dyoung 1586: if (flagsp != NULL)
1.1 cgd 1587: *flagsp |= flags;
1.54 lukem 1588: release:
1.1 cgd 1589: sbunlock(&so->so_rcv);
1.160 ad 1590: sounlock(so);
1.1 cgd 1591: splx(s);
1.144 dyoung 1592: return error;
1.1 cgd 1593: }
1594:
1.14 mycroft 1595: int
1.54 lukem 1596: soshutdown(struct socket *so, int how)
1.1 cgd 1597: {
1.99 matt 1598: const struct protosw *pr;
1.160 ad 1599: int error;
1600:
1601: KASSERT(solocked(so));
1.34 kleink 1602:
1.54 lukem 1603: pr = so->so_proto;
1.34 kleink 1604: if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR))
1605: return (EINVAL);
1.1 cgd 1606:
1.160 ad 1607: if (how == SHUT_RD || how == SHUT_RDWR) {
1.1 cgd 1608: sorflush(so);
1.160 ad 1609: error = 0;
1610: }
1.34 kleink 1611: if (how == SHUT_WR || how == SHUT_RDWR)
1.160 ad 1612: error = (*pr->pr_usrreq)(so, PRU_SHUTDOWN, NULL,
1.140 dyoung 1613: NULL, NULL, NULL);
1.160 ad 1614:
1615: return error;
1.1 cgd 1616: }
1617:
1.195 dsl 1618: void
1.196 dsl 1619: sorestart(struct socket *so)
1.188 ad 1620: {
1.196 dsl 1621: /*
1622: * An application has called close() on an fd on which another
1623: * of its threads has called a socket system call.
1624: * Mark this and wake everyone up, and code that would block again
1625: * instead returns ERESTART.
1626: * On system call re-entry the fd is validated and EBADF returned.
1627: * Any other fd will block again on the 2nd syscall.
1628: */
1.188 ad 1629: solock(so);
1.196 dsl 1630: so->so_state |= SS_RESTARTSYS;
1.188 ad 1631: cv_broadcast(&so->so_cv);
1.196 dsl 1632: cv_broadcast(&so->so_snd.sb_cv);
1633: cv_broadcast(&so->so_rcv.sb_cv);
1.188 ad 1634: sounlock(so);
1635: }
1636:
1.14 mycroft 1637: void
1.54 lukem 1638: sorflush(struct socket *so)
1.1 cgd 1639: {
1.54 lukem 1640: struct sockbuf *sb, asb;
1.99 matt 1641: const struct protosw *pr;
1.160 ad 1642:
1643: KASSERT(solocked(so));
1.1 cgd 1644:
1.54 lukem 1645: sb = &so->so_rcv;
1646: pr = so->so_proto;
1.160 ad 1647: socantrcvmore(so);
1.1 cgd 1648: sb->sb_flags |= SB_NOINTR;
1.160 ad 1649: (void )sblock(sb, M_WAITOK);
1.1 cgd 1650: sbunlock(sb);
1651: asb = *sb;
1.86 wrstuden 1652: /*
1653: * Clear most of the sockbuf structure, but leave some of the
1654: * fields valid.
1655: */
1656: memset(&sb->sb_startzero, 0,
1657: sizeof(*sb) - offsetof(struct sockbuf, sb_startzero));
1.160 ad 1658: if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose) {
1659: sounlock(so);
1.1 cgd 1660: (*pr->pr_domain->dom_dispose)(asb.sb_mb);
1.160 ad 1661: solock(so);
1662: }
1.98 christos 1663: sbrelease(&asb, so);
1.1 cgd 1664: }
1665:
1.171 plunky 1666: /*
1667: * internal set SOL_SOCKET options
1668: */
1.142 dyoung 1669: static int
1.171 plunky 1670: sosetopt1(struct socket *so, const struct sockopt *sopt)
1.1 cgd 1671: {
1.182 christos 1672: int error = EINVAL, optval, opt;
1.171 plunky 1673: struct linger l;
1674: struct timeval tv;
1.142 dyoung 1675:
1.179 christos 1676: switch ((opt = sopt->sopt_name)) {
1.142 dyoung 1677:
1.170 tls 1678: case SO_ACCEPTFILTER:
1.177 ad 1679: error = accept_filt_setopt(so, sopt);
1680: KASSERT(solocked(so));
1.170 tls 1681: break;
1682:
1.171 plunky 1683: case SO_LINGER:
1684: error = sockopt_get(sopt, &l, sizeof(l));
1.177 ad 1685: solock(so);
1.171 plunky 1686: if (error)
1.177 ad 1687: break;
1.171 plunky 1688: if (l.l_linger < 0 || l.l_linger > USHRT_MAX ||
1.177 ad 1689: l.l_linger > (INT_MAX / hz)) {
1690: error = EDOM;
1691: break;
1692: }
1.171 plunky 1693: so->so_linger = l.l_linger;
1694: if (l.l_onoff)
1695: so->so_options |= SO_LINGER;
1696: else
1697: so->so_options &= ~SO_LINGER;
1.177 ad 1698: break;
1.1 cgd 1699:
1.142 dyoung 1700: case SO_DEBUG:
1701: case SO_KEEPALIVE:
1702: case SO_DONTROUTE:
1703: case SO_USELOOPBACK:
1704: case SO_BROADCAST:
1705: case SO_REUSEADDR:
1706: case SO_REUSEPORT:
1707: case SO_OOBINLINE:
1708: case SO_TIMESTAMP:
1.207 christos 1709: case SO_NOSIGPIPE:
1.184 christos 1710: #ifdef SO_OTIMESTAMP
1711: case SO_OTIMESTAMP:
1712: #endif
1.171 plunky 1713: error = sockopt_getint(sopt, &optval);
1.177 ad 1714: solock(so);
1.171 plunky 1715: if (error)
1.177 ad 1716: break;
1.171 plunky 1717: if (optval)
1.179 christos 1718: so->so_options |= opt;
1.142 dyoung 1719: else
1.179 christos 1720: so->so_options &= ~opt;
1.142 dyoung 1721: break;
1722:
1723: case SO_SNDBUF:
1724: case SO_RCVBUF:
1725: case SO_SNDLOWAT:
1726: case SO_RCVLOWAT:
1.171 plunky 1727: error = sockopt_getint(sopt, &optval);
1.177 ad 1728: solock(so);
1.171 plunky 1729: if (error)
1.177 ad 1730: break;
1.1 cgd 1731:
1.142 dyoung 1732: /*
1733: * Values < 1 make no sense for any of these
1734: * options, so disallow them.
1735: */
1.177 ad 1736: if (optval < 1) {
1737: error = EINVAL;
1738: break;
1739: }
1.1 cgd 1740:
1.179 christos 1741: switch (opt) {
1.171 plunky 1742: case SO_SNDBUF:
1.177 ad 1743: if (sbreserve(&so->so_snd, (u_long)optval, so) == 0) {
1744: error = ENOBUFS;
1745: break;
1746: }
1.171 plunky 1747: so->so_snd.sb_flags &= ~SB_AUTOSIZE;
1748: break;
1.1 cgd 1749:
1750: case SO_RCVBUF:
1.177 ad 1751: if (sbreserve(&so->so_rcv, (u_long)optval, so) == 0) {
1752: error = ENOBUFS;
1753: break;
1754: }
1.171 plunky 1755: so->so_rcv.sb_flags &= ~SB_AUTOSIZE;
1.142 dyoung 1756: break;
1757:
1758: /*
1759: * Make sure the low-water is never greater than
1760: * the high-water.
1761: */
1.1 cgd 1762: case SO_SNDLOWAT:
1.171 plunky 1763: if (optval > so->so_snd.sb_hiwat)
1764: optval = so->so_snd.sb_hiwat;
1765:
1766: so->so_snd.sb_lowat = optval;
1.142 dyoung 1767: break;
1.171 plunky 1768:
1.1 cgd 1769: case SO_RCVLOWAT:
1.171 plunky 1770: if (optval > so->so_rcv.sb_hiwat)
1771: optval = so->so_rcv.sb_hiwat;
1772:
1773: so->so_rcv.sb_lowat = optval;
1.142 dyoung 1774: break;
1775: }
1776: break;
1.28 thorpej 1777:
1.179 christos 1778: #ifdef COMPAT_50
1779: case SO_OSNDTIMEO:
1780: case SO_ORCVTIMEO: {
1781: struct timeval50 otv;
1782: error = sockopt_get(sopt, &otv, sizeof(otv));
1.186 pooka 1783: if (error) {
1784: solock(so);
1.183 christos 1785: break;
1.186 pooka 1786: }
1.179 christos 1787: timeval50_to_timeval(&otv, &tv);
1788: opt = opt == SO_OSNDTIMEO ? SO_SNDTIMEO : SO_RCVTIMEO;
1.182 christos 1789: error = 0;
1.179 christos 1790: /*FALLTHROUGH*/
1791: }
1792: #endif /* COMPAT_50 */
1793:
1.142 dyoung 1794: case SO_SNDTIMEO:
1795: case SO_RCVTIMEO:
1.182 christos 1796: if (error)
1.179 christos 1797: error = sockopt_get(sopt, &tv, sizeof(tv));
1.177 ad 1798: solock(so);
1.171 plunky 1799: if (error)
1.177 ad 1800: break;
1.171 plunky 1801:
1.177 ad 1802: if (tv.tv_sec > (INT_MAX - tv.tv_usec / tick) / hz) {
1803: error = EDOM;
1804: break;
1805: }
1.28 thorpej 1806:
1.171 plunky 1807: optval = tv.tv_sec * hz + tv.tv_usec / tick;
1808: if (optval == 0 && tv.tv_usec != 0)
1809: optval = 1;
1.28 thorpej 1810:
1.179 christos 1811: switch (opt) {
1.142 dyoung 1812: case SO_SNDTIMEO:
1.171 plunky 1813: so->so_snd.sb_timeo = optval;
1.1 cgd 1814: break;
1815: case SO_RCVTIMEO:
1.171 plunky 1816: so->so_rcv.sb_timeo = optval;
1.142 dyoung 1817: break;
1818: }
1819: break;
1.1 cgd 1820:
1.142 dyoung 1821: default:
1.177 ad 1822: solock(so);
1823: error = ENOPROTOOPT;
1824: break;
1.142 dyoung 1825: }
1.177 ad 1826: KASSERT(solocked(so));
1827: return error;
1.142 dyoung 1828: }
1.1 cgd 1829:
1.142 dyoung 1830: int
1.171 plunky 1831: sosetopt(struct socket *so, struct sockopt *sopt)
1.142 dyoung 1832: {
1833: int error, prerr;
1.1 cgd 1834:
1.177 ad 1835: if (sopt->sopt_level == SOL_SOCKET) {
1.171 plunky 1836: error = sosetopt1(so, sopt);
1.177 ad 1837: KASSERT(solocked(so));
1838: } else {
1.142 dyoung 1839: error = ENOPROTOOPT;
1.177 ad 1840: solock(so);
1841: }
1.1 cgd 1842:
1.142 dyoung 1843: if ((error == 0 || error == ENOPROTOOPT) &&
1844: so->so_proto != NULL && so->so_proto->pr_ctloutput != NULL) {
1845: /* give the protocol stack a shot */
1.171 plunky 1846: prerr = (*so->so_proto->pr_ctloutput)(PRCO_SETOPT, so, sopt);
1.142 dyoung 1847: if (prerr == 0)
1848: error = 0;
1849: else if (prerr != ENOPROTOOPT)
1850: error = prerr;
1.171 plunky 1851: }
1.160 ad 1852: sounlock(so);
1.142 dyoung 1853: return error;
1.1 cgd 1854: }
1855:
1.171 plunky 1856: /*
1857: * so_setsockopt() is a wrapper providing a sockopt structure for sosetopt()
1858: */
1859: int
1860: so_setsockopt(struct lwp *l, struct socket *so, int level, int name,
1861: const void *val, size_t valsize)
1862: {
1863: struct sockopt sopt;
1864: int error;
1865:
1866: KASSERT(valsize == 0 || val != NULL);
1867:
1868: sockopt_init(&sopt, level, name, valsize);
1869: sockopt_set(&sopt, val, valsize);
1870:
1871: error = sosetopt(so, &sopt);
1872:
1873: sockopt_destroy(&sopt);
1874:
1875: return error;
1876: }
1877:
1878: /*
1879: * internal get SOL_SOCKET options
1880: */
1881: static int
1882: sogetopt1(struct socket *so, struct sockopt *sopt)
1883: {
1.179 christos 1884: int error, optval, opt;
1.171 plunky 1885: struct linger l;
1886: struct timeval tv;
1887:
1.179 christos 1888: switch ((opt = sopt->sopt_name)) {
1.171 plunky 1889:
1890: case SO_ACCEPTFILTER:
1.177 ad 1891: error = accept_filt_getopt(so, sopt);
1.171 plunky 1892: break;
1893:
1894: case SO_LINGER:
1895: l.l_onoff = (so->so_options & SO_LINGER) ? 1 : 0;
1896: l.l_linger = so->so_linger;
1897:
1898: error = sockopt_set(sopt, &l, sizeof(l));
1899: break;
1900:
1901: case SO_USELOOPBACK:
1902: case SO_DONTROUTE:
1903: case SO_DEBUG:
1904: case SO_KEEPALIVE:
1905: case SO_REUSEADDR:
1906: case SO_REUSEPORT:
1907: case SO_BROADCAST:
1908: case SO_OOBINLINE:
1909: case SO_TIMESTAMP:
1.207 christos 1910: case SO_NOSIGPIPE:
1.184 christos 1911: #ifdef SO_OTIMESTAMP
1912: case SO_OTIMESTAMP:
1913: #endif
1.179 christos 1914: error = sockopt_setint(sopt, (so->so_options & opt) ? 1 : 0);
1.171 plunky 1915: break;
1916:
1917: case SO_TYPE:
1918: error = sockopt_setint(sopt, so->so_type);
1919: break;
1920:
1921: case SO_ERROR:
1922: error = sockopt_setint(sopt, so->so_error);
1923: so->so_error = 0;
1924: break;
1925:
1926: case SO_SNDBUF:
1927: error = sockopt_setint(sopt, so->so_snd.sb_hiwat);
1928: break;
1929:
1930: case SO_RCVBUF:
1931: error = sockopt_setint(sopt, so->so_rcv.sb_hiwat);
1932: break;
1933:
1934: case SO_SNDLOWAT:
1935: error = sockopt_setint(sopt, so->so_snd.sb_lowat);
1936: break;
1937:
1938: case SO_RCVLOWAT:
1939: error = sockopt_setint(sopt, so->so_rcv.sb_lowat);
1940: break;
1941:
1.179 christos 1942: #ifdef COMPAT_50
1943: case SO_OSNDTIMEO:
1944: case SO_ORCVTIMEO: {
1945: struct timeval50 otv;
1946:
1947: optval = (opt == SO_OSNDTIMEO ?
1948: so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
1949:
1950: otv.tv_sec = optval / hz;
1951: otv.tv_usec = (optval % hz) * tick;
1952:
1953: error = sockopt_set(sopt, &otv, sizeof(otv));
1954: break;
1955: }
1956: #endif /* COMPAT_50 */
1957:
1.171 plunky 1958: case SO_SNDTIMEO:
1959: case SO_RCVTIMEO:
1.179 christos 1960: optval = (opt == SO_SNDTIMEO ?
1.171 plunky 1961: so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
1962:
1963: tv.tv_sec = optval / hz;
1964: tv.tv_usec = (optval % hz) * tick;
1965:
1966: error = sockopt_set(sopt, &tv, sizeof(tv));
1967: break;
1968:
1969: case SO_OVERFLOWED:
1970: error = sockopt_setint(sopt, so->so_rcv.sb_overflowed);
1971: break;
1972:
1973: default:
1974: error = ENOPROTOOPT;
1975: break;
1976: }
1977:
1978: return (error);
1979: }
1980:
1.14 mycroft 1981: int
1.171 plunky 1982: sogetopt(struct socket *so, struct sockopt *sopt)
1.1 cgd 1983: {
1.160 ad 1984: int error;
1.1 cgd 1985:
1.160 ad 1986: solock(so);
1.171 plunky 1987: if (sopt->sopt_level != SOL_SOCKET) {
1.1 cgd 1988: if (so->so_proto && so->so_proto->pr_ctloutput) {
1.160 ad 1989: error = ((*so->so_proto->pr_ctloutput)
1.171 plunky 1990: (PRCO_GETOPT, so, sopt));
1.1 cgd 1991: } else
1.160 ad 1992: error = (ENOPROTOOPT);
1.1 cgd 1993: } else {
1.171 plunky 1994: error = sogetopt1(so, sopt);
1995: }
1996: sounlock(so);
1997: return (error);
1998: }
1999:
2000: /*
2001: * alloc sockopt data buffer buffer
2002: * - will be released at destroy
2003: */
1.176 plunky 2004: static int
2005: sockopt_alloc(struct sockopt *sopt, size_t len, km_flag_t kmflag)
1.171 plunky 2006: {
2007:
2008: KASSERT(sopt->sopt_size == 0);
2009:
1.176 plunky 2010: if (len > sizeof(sopt->sopt_buf)) {
2011: sopt->sopt_data = kmem_zalloc(len, kmflag);
2012: if (sopt->sopt_data == NULL)
2013: return ENOMEM;
2014: } else
1.171 plunky 2015: sopt->sopt_data = sopt->sopt_buf;
2016:
2017: sopt->sopt_size = len;
1.176 plunky 2018: return 0;
1.171 plunky 2019: }
2020:
2021: /*
2022: * initialise sockopt storage
1.176 plunky 2023: * - MAY sleep during allocation
1.171 plunky 2024: */
2025: void
2026: sockopt_init(struct sockopt *sopt, int level, int name, size_t size)
2027: {
1.1 cgd 2028:
1.171 plunky 2029: memset(sopt, 0, sizeof(*sopt));
1.1 cgd 2030:
1.171 plunky 2031: sopt->sopt_level = level;
2032: sopt->sopt_name = name;
1.176 plunky 2033: (void)sockopt_alloc(sopt, size, KM_SLEEP);
1.171 plunky 2034: }
2035:
2036: /*
2037: * destroy sockopt storage
2038: * - will release any held memory references
2039: */
2040: void
2041: sockopt_destroy(struct sockopt *sopt)
2042: {
2043:
2044: if (sopt->sopt_data != sopt->sopt_buf)
1.173 plunky 2045: kmem_free(sopt->sopt_data, sopt->sopt_size);
1.171 plunky 2046:
2047: memset(sopt, 0, sizeof(*sopt));
2048: }
2049:
2050: /*
2051: * set sockopt value
2052: * - value is copied into sockopt
1.176 plunky 2053: * - memory is allocated when necessary, will not sleep
1.171 plunky 2054: */
2055: int
2056: sockopt_set(struct sockopt *sopt, const void *buf, size_t len)
2057: {
1.176 plunky 2058: int error;
1.171 plunky 2059:
1.176 plunky 2060: if (sopt->sopt_size == 0) {
2061: error = sockopt_alloc(sopt, len, KM_NOSLEEP);
2062: if (error)
2063: return error;
2064: }
1.171 plunky 2065:
2066: KASSERT(sopt->sopt_size == len);
2067: memcpy(sopt->sopt_data, buf, len);
2068: return 0;
2069: }
2070:
2071: /*
2072: * common case of set sockopt integer value
2073: */
2074: int
2075: sockopt_setint(struct sockopt *sopt, int val)
2076: {
2077:
2078: return sockopt_set(sopt, &val, sizeof(int));
2079: }
2080:
2081: /*
2082: * get sockopt value
2083: * - correct size must be given
2084: */
2085: int
2086: sockopt_get(const struct sockopt *sopt, void *buf, size_t len)
2087: {
1.170 tls 2088:
1.171 plunky 2089: if (sopt->sopt_size != len)
2090: return EINVAL;
1.1 cgd 2091:
1.171 plunky 2092: memcpy(buf, sopt->sopt_data, len);
2093: return 0;
2094: }
1.1 cgd 2095:
1.171 plunky 2096: /*
2097: * common case of get sockopt integer value
2098: */
2099: int
2100: sockopt_getint(const struct sockopt *sopt, int *valp)
2101: {
1.1 cgd 2102:
1.171 plunky 2103: return sockopt_get(sopt, valp, sizeof(int));
2104: }
1.1 cgd 2105:
1.171 plunky 2106: /*
2107: * set sockopt value from mbuf
2108: * - ONLY for legacy code
2109: * - mbuf is released by sockopt
1.176 plunky 2110: * - will not sleep
1.171 plunky 2111: */
2112: int
2113: sockopt_setmbuf(struct sockopt *sopt, struct mbuf *m)
2114: {
2115: size_t len;
1.176 plunky 2116: int error;
1.1 cgd 2117:
1.171 plunky 2118: len = m_length(m);
1.1 cgd 2119:
1.176 plunky 2120: if (sopt->sopt_size == 0) {
2121: error = sockopt_alloc(sopt, len, KM_NOSLEEP);
2122: if (error)
2123: return error;
2124: }
1.1 cgd 2125:
1.171 plunky 2126: KASSERT(sopt->sopt_size == len);
2127: m_copydata(m, 0, len, sopt->sopt_data);
2128: m_freem(m);
1.1 cgd 2129:
1.171 plunky 2130: return 0;
2131: }
1.1 cgd 2132:
1.171 plunky 2133: /*
2134: * get sockopt value into mbuf
2135: * - ONLY for legacy code
2136: * - mbuf to be released by the caller
1.176 plunky 2137: * - will not sleep
1.171 plunky 2138: */
2139: struct mbuf *
2140: sockopt_getmbuf(const struct sockopt *sopt)
2141: {
2142: struct mbuf *m;
1.107 darrenr 2143:
1.176 plunky 2144: if (sopt->sopt_size > MCLBYTES)
2145: return NULL;
2146:
2147: m = m_get(M_DONTWAIT, MT_SOOPTS);
1.171 plunky 2148: if (m == NULL)
2149: return NULL;
2150:
1.176 plunky 2151: if (sopt->sopt_size > MLEN) {
2152: MCLGET(m, M_DONTWAIT);
2153: if ((m->m_flags & M_EXT) == 0) {
2154: m_free(m);
2155: return NULL;
2156: }
1.1 cgd 2157: }
1.176 plunky 2158:
2159: memcpy(mtod(m, void *), sopt->sopt_data, sopt->sopt_size);
2160: m->m_len = sopt->sopt_size;
1.160 ad 2161:
1.171 plunky 2162: return m;
1.1 cgd 2163: }
2164:
1.14 mycroft 2165: void
1.54 lukem 2166: sohasoutofband(struct socket *so)
1.1 cgd 2167: {
1.153 rmind 2168:
1.90 christos 2169: fownsignal(so->so_pgid, SIGURG, POLL_PRI, POLLPRI|POLLRDBAND, so);
1.189 ad 2170: selnotify(&so->so_rcv.sb_sel, POLLPRI | POLLRDBAND, NOTE_SUBMIT);
1.1 cgd 2171: }
1.72 jdolecek 2172:
2173: static void
2174: filt_sordetach(struct knote *kn)
2175: {
2176: struct socket *so;
2177:
1.155 ad 2178: so = ((file_t *)kn->kn_obj)->f_data;
1.160 ad 2179: solock(so);
1.73 christos 2180: SLIST_REMOVE(&so->so_rcv.sb_sel.sel_klist, kn, knote, kn_selnext);
2181: if (SLIST_EMPTY(&so->so_rcv.sb_sel.sel_klist))
1.72 jdolecek 2182: so->so_rcv.sb_flags &= ~SB_KNOTE;
1.160 ad 2183: sounlock(so);
1.72 jdolecek 2184: }
2185:
2186: /*ARGSUSED*/
2187: static int
1.129 yamt 2188: filt_soread(struct knote *kn, long hint)
1.72 jdolecek 2189: {
2190: struct socket *so;
1.160 ad 2191: int rv;
1.72 jdolecek 2192:
1.155 ad 2193: so = ((file_t *)kn->kn_obj)->f_data;
1.160 ad 2194: if (hint != NOTE_SUBMIT)
2195: solock(so);
1.72 jdolecek 2196: kn->kn_data = so->so_rcv.sb_cc;
2197: if (so->so_state & SS_CANTRCVMORE) {
1.108 perry 2198: kn->kn_flags |= EV_EOF;
1.72 jdolecek 2199: kn->kn_fflags = so->so_error;
1.160 ad 2200: rv = 1;
2201: } else if (so->so_error) /* temporary udp error */
2202: rv = 1;
2203: else if (kn->kn_sfflags & NOTE_LOWAT)
2204: rv = (kn->kn_data >= kn->kn_sdata);
2205: else
2206: rv = (kn->kn_data >= so->so_rcv.sb_lowat);
2207: if (hint != NOTE_SUBMIT)
2208: sounlock(so);
2209: return rv;
1.72 jdolecek 2210: }
2211:
2212: static void
2213: filt_sowdetach(struct knote *kn)
2214: {
2215: struct socket *so;
2216:
1.155 ad 2217: so = ((file_t *)kn->kn_obj)->f_data;
1.160 ad 2218: solock(so);
1.73 christos 2219: SLIST_REMOVE(&so->so_snd.sb_sel.sel_klist, kn, knote, kn_selnext);
2220: if (SLIST_EMPTY(&so->so_snd.sb_sel.sel_klist))
1.72 jdolecek 2221: so->so_snd.sb_flags &= ~SB_KNOTE;
1.160 ad 2222: sounlock(so);
1.72 jdolecek 2223: }
2224:
2225: /*ARGSUSED*/
2226: static int
1.129 yamt 2227: filt_sowrite(struct knote *kn, long hint)
1.72 jdolecek 2228: {
2229: struct socket *so;
1.160 ad 2230: int rv;
1.72 jdolecek 2231:
1.155 ad 2232: so = ((file_t *)kn->kn_obj)->f_data;
1.160 ad 2233: if (hint != NOTE_SUBMIT)
2234: solock(so);
1.72 jdolecek 2235: kn->kn_data = sbspace(&so->so_snd);
2236: if (so->so_state & SS_CANTSENDMORE) {
1.108 perry 2237: kn->kn_flags |= EV_EOF;
1.72 jdolecek 2238: kn->kn_fflags = so->so_error;
1.160 ad 2239: rv = 1;
2240: } else if (so->so_error) /* temporary udp error */
2241: rv = 1;
2242: else if (((so->so_state & SS_ISCONNECTED) == 0) &&
1.72 jdolecek 2243: (so->so_proto->pr_flags & PR_CONNREQUIRED))
1.160 ad 2244: rv = 0;
2245: else if (kn->kn_sfflags & NOTE_LOWAT)
2246: rv = (kn->kn_data >= kn->kn_sdata);
2247: else
2248: rv = (kn->kn_data >= so->so_snd.sb_lowat);
2249: if (hint != NOTE_SUBMIT)
2250: sounlock(so);
2251: return rv;
1.72 jdolecek 2252: }
2253:
2254: /*ARGSUSED*/
2255: static int
1.129 yamt 2256: filt_solisten(struct knote *kn, long hint)
1.72 jdolecek 2257: {
2258: struct socket *so;
1.160 ad 2259: int rv;
1.72 jdolecek 2260:
1.155 ad 2261: so = ((file_t *)kn->kn_obj)->f_data;
1.72 jdolecek 2262:
2263: /*
2264: * Set kn_data to number of incoming connections, not
2265: * counting partial (incomplete) connections.
1.108 perry 2266: */
1.160 ad 2267: if (hint != NOTE_SUBMIT)
2268: solock(so);
1.72 jdolecek 2269: kn->kn_data = so->so_qlen;
1.160 ad 2270: rv = (kn->kn_data > 0);
2271: if (hint != NOTE_SUBMIT)
2272: sounlock(so);
2273: return rv;
1.72 jdolecek 2274: }
2275:
2276: static const struct filterops solisten_filtops =
2277: { 1, NULL, filt_sordetach, filt_solisten };
2278: static const struct filterops soread_filtops =
2279: { 1, NULL, filt_sordetach, filt_soread };
2280: static const struct filterops sowrite_filtops =
2281: { 1, NULL, filt_sowdetach, filt_sowrite };
2282:
2283: int
1.129 yamt 2284: soo_kqfilter(struct file *fp, struct knote *kn)
1.72 jdolecek 2285: {
2286: struct socket *so;
2287: struct sockbuf *sb;
2288:
1.155 ad 2289: so = ((file_t *)kn->kn_obj)->f_data;
1.160 ad 2290: solock(so);
1.72 jdolecek 2291: switch (kn->kn_filter) {
2292: case EVFILT_READ:
2293: if (so->so_options & SO_ACCEPTCONN)
2294: kn->kn_fop = &solisten_filtops;
2295: else
2296: kn->kn_fop = &soread_filtops;
2297: sb = &so->so_rcv;
2298: break;
2299: case EVFILT_WRITE:
2300: kn->kn_fop = &sowrite_filtops;
2301: sb = &so->so_snd;
2302: break;
2303: default:
1.160 ad 2304: sounlock(so);
1.149 pooka 2305: return (EINVAL);
1.72 jdolecek 2306: }
1.73 christos 2307: SLIST_INSERT_HEAD(&sb->sb_sel.sel_klist, kn, kn_selnext);
1.72 jdolecek 2308: sb->sb_flags |= SB_KNOTE;
1.160 ad 2309: sounlock(so);
1.72 jdolecek 2310: return (0);
2311: }
2312:
1.154 ad 2313: static int
2314: sodopoll(struct socket *so, int events)
2315: {
2316: int revents;
2317:
2318: revents = 0;
2319:
2320: if (events & (POLLIN | POLLRDNORM))
2321: if (soreadable(so))
2322: revents |= events & (POLLIN | POLLRDNORM);
2323:
2324: if (events & (POLLOUT | POLLWRNORM))
2325: if (sowritable(so))
2326: revents |= events & (POLLOUT | POLLWRNORM);
2327:
2328: if (events & (POLLPRI | POLLRDBAND))
2329: if (so->so_oobmark || (so->so_state & SS_RCVATMARK))
2330: revents |= events & (POLLPRI | POLLRDBAND);
2331:
2332: return revents;
2333: }
2334:
2335: int
2336: sopoll(struct socket *so, int events)
2337: {
2338: int revents = 0;
2339:
1.160 ad 2340: #ifndef DIAGNOSTIC
2341: /*
2342: * Do a quick, unlocked check in expectation that the socket
2343: * will be ready for I/O. Don't do this check if DIAGNOSTIC,
2344: * as the solocked() assertions will fail.
2345: */
1.154 ad 2346: if ((revents = sodopoll(so, events)) != 0)
2347: return revents;
1.160 ad 2348: #endif
1.154 ad 2349:
1.160 ad 2350: solock(so);
1.154 ad 2351: if ((revents = sodopoll(so, events)) == 0) {
2352: if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
2353: selrecord(curlwp, &so->so_rcv.sb_sel);
1.160 ad 2354: so->so_rcv.sb_flags |= SB_NOTIFY;
1.154 ad 2355: }
2356:
2357: if (events & (POLLOUT | POLLWRNORM)) {
2358: selrecord(curlwp, &so->so_snd.sb_sel);
1.160 ad 2359: so->so_snd.sb_flags |= SB_NOTIFY;
1.154 ad 2360: }
2361: }
1.160 ad 2362: sounlock(so);
1.154 ad 2363:
2364: return revents;
2365: }
2366:
2367:
1.94 yamt 2368: #include <sys/sysctl.h>
2369:
2370: static int sysctl_kern_somaxkva(SYSCTLFN_PROTO);
2371:
2372: /*
2373: * sysctl helper routine for kern.somaxkva. ensures that the given
2374: * value is not too small.
2375: * (XXX should we maybe make sure it's not too large as well?)
2376: */
2377: static int
2378: sysctl_kern_somaxkva(SYSCTLFN_ARGS)
2379: {
2380: int error, new_somaxkva;
2381: struct sysctlnode node;
2382:
2383: new_somaxkva = somaxkva;
2384: node = *rnode;
2385: node.sysctl_data = &new_somaxkva;
2386: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2387: if (error || newp == NULL)
2388: return (error);
2389:
2390: if (new_somaxkva < (16 * 1024 * 1024)) /* sanity */
2391: return (EINVAL);
2392:
1.136 ad 2393: mutex_enter(&so_pendfree_lock);
1.94 yamt 2394: somaxkva = new_somaxkva;
1.136 ad 2395: cv_broadcast(&socurkva_cv);
2396: mutex_exit(&so_pendfree_lock);
1.94 yamt 2397:
2398: return (error);
2399: }
2400:
1.178 pooka 2401: static void
1.187 cegger 2402: sysctl_kern_somaxkva_setup(void)
1.94 yamt 2403: {
2404:
1.178 pooka 2405: KASSERT(socket_sysctllog == NULL);
2406: sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
1.97 atatat 2407: CTLFLAG_PERMANENT,
2408: CTLTYPE_NODE, "kern", NULL,
2409: NULL, 0, NULL, 0,
2410: CTL_KERN, CTL_EOL);
2411:
1.178 pooka 2412: sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
1.97 atatat 2413: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.103 atatat 2414: CTLTYPE_INT, "somaxkva",
2415: SYSCTL_DESCR("Maximum amount of kernel memory to be "
2416: "used for socket buffers"),
1.94 yamt 2417: sysctl_kern_somaxkva, 0, NULL, 0,
2418: CTL_KERN, KERN_SOMAXKVA, CTL_EOL);
2419: }
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