Annotation of src/sys/kern/uipc_socket.c, Revision 1.217
1.217 ! rmind 1: /* $NetBSD: uipc_socket.c,v 1.216 2013/08/02 20:00:33 spz 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>
1.217 ! rmind 66: __KERNEL_RCSID(0, "$NetBSD: uipc_socket.c,v 1.216 2013/08/02 20:00:33 spz 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:
1.212 pooka 163: static void sysctl_kern_socket_setup(void);
1.178 pooka 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:
1.216 spz 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:
1.212 pooka 456: sysctl_kern_socket_setup();
1.178 pooka 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);
1.214 gdt 541: /* XXX Why is this not solock, to match sounlock? */
1.160 ad 542: mutex_enter(lock);
543: } else {
544: /* Lock assigned and taken during PRU_ATTACH. */
545: }
1.140 dyoung 546: error = (*prp->pr_usrreq)(so, PRU_ATTACH, NULL,
547: (struct mbuf *)(long)proto, NULL, l);
1.160 ad 548: KASSERT(solocked(so));
1.140 dyoung 549: if (error != 0) {
1.1 cgd 550: so->so_state |= SS_NOFDREF;
551: sofree(so);
1.140 dyoung 552: return error;
1.1 cgd 553: }
1.198 elad 554: so->so_cred = kauth_cred_dup(l->l_cred);
1.160 ad 555: sounlock(so);
1.1 cgd 556: *aso = so;
1.140 dyoung 557: return 0;
1.1 cgd 558: }
559:
1.142 dyoung 560: /* On success, write file descriptor to fdout and return zero. On
561: * failure, return non-zero; *fdout will be undefined.
562: */
563: int
564: fsocreate(int domain, struct socket **sop, int type, int protocol,
565: struct lwp *l, int *fdout)
566: {
567: struct socket *so;
568: struct file *fp;
569: int fd, error;
1.204 christos 570: int flags = type & SOCK_FLAGS_MASK;
1.142 dyoung 571:
1.204 christos 572: type &= ~SOCK_FLAGS_MASK;
1.155 ad 573: if ((error = fd_allocfile(&fp, &fd)) != 0)
1.204 christos 574: return error;
575: fd_set_exclose(l, fd, (flags & SOCK_CLOEXEC) != 0);
1.207 christos 576: fp->f_flag = FREAD|FWRITE|((flags & SOCK_NONBLOCK) ? FNONBLOCK : 0)|
577: ((flags & SOCK_NOSIGPIPE) ? FNOSIGPIPE : 0);
1.142 dyoung 578: fp->f_type = DTYPE_SOCKET;
579: fp->f_ops = &socketops;
1.160 ad 580: error = socreate(domain, &so, type, protocol, l, NULL);
1.142 dyoung 581: if (error != 0) {
1.155 ad 582: fd_abort(curproc, fp, fd);
1.142 dyoung 583: } else {
584: if (sop != NULL)
585: *sop = so;
586: fp->f_data = so;
1.155 ad 587: fd_affix(curproc, fp, fd);
1.142 dyoung 588: *fdout = fd;
1.213 christos 589: if (flags & SOCK_NONBLOCK)
590: so->so_state |= SS_NBIO;
1.142 dyoung 591: }
592: return error;
593: }
594:
1.3 andrew 595: int
1.190 dyoung 596: sofamily(const struct socket *so)
597: {
598: const struct protosw *pr;
599: const struct domain *dom;
600:
601: if ((pr = so->so_proto) == NULL)
602: return AF_UNSPEC;
603: if ((dom = pr->pr_domain) == NULL)
604: return AF_UNSPEC;
605: return dom->dom_family;
606: }
607:
608: int
1.114 christos 609: sobind(struct socket *so, struct mbuf *nam, struct lwp *l)
1.1 cgd 610: {
1.160 ad 611: int error;
1.1 cgd 612:
1.160 ad 613: solock(so);
1.140 dyoung 614: error = (*so->so_proto->pr_usrreq)(so, PRU_BIND, NULL, nam, NULL, l);
1.160 ad 615: sounlock(so);
1.140 dyoung 616: return error;
1.1 cgd 617: }
618:
1.3 andrew 619: int
1.150 elad 620: solisten(struct socket *so, int backlog, struct lwp *l)
1.1 cgd 621: {
1.160 ad 622: int error;
1.1 cgd 623:
1.160 ad 624: solock(so);
1.158 ad 625: if ((so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING |
1.163 ad 626: SS_ISDISCONNECTING)) != 0) {
627: sounlock(so);
1.210 matt 628: return (EINVAL);
1.163 ad 629: }
1.140 dyoung 630: error = (*so->so_proto->pr_usrreq)(so, PRU_LISTEN, NULL,
1.150 elad 631: NULL, NULL, l);
1.140 dyoung 632: if (error != 0) {
1.160 ad 633: sounlock(so);
1.140 dyoung 634: return error;
1.1 cgd 635: }
1.63 matt 636: if (TAILQ_EMPTY(&so->so_q))
1.1 cgd 637: so->so_options |= SO_ACCEPTCONN;
638: if (backlog < 0)
639: backlog = 0;
1.49 jonathan 640: so->so_qlimit = min(backlog, somaxconn);
1.160 ad 641: sounlock(so);
1.140 dyoung 642: return 0;
1.1 cgd 643: }
644:
1.21 christos 645: void
1.54 lukem 646: sofree(struct socket *so)
1.1 cgd 647: {
1.161 ad 648: u_int refs;
1.1 cgd 649:
1.160 ad 650: KASSERT(solocked(so));
651:
652: if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0) {
653: sounlock(so);
1.1 cgd 654: return;
1.160 ad 655: }
1.43 mycroft 656: if (so->so_head) {
657: /*
658: * We must not decommission a socket that's on the accept(2)
659: * queue. If we do, then accept(2) may hang after select(2)
660: * indicated that the listening socket was ready.
661: */
1.160 ad 662: if (!soqremque(so, 0)) {
663: sounlock(so);
1.43 mycroft 664: return;
1.160 ad 665: }
1.43 mycroft 666: }
1.98 christos 667: if (so->so_rcv.sb_hiwat)
1.110 christos 668: (void)chgsbsize(so->so_uidinfo, &so->so_rcv.sb_hiwat, 0,
1.98 christos 669: RLIM_INFINITY);
670: if (so->so_snd.sb_hiwat)
1.110 christos 671: (void)chgsbsize(so->so_uidinfo, &so->so_snd.sb_hiwat, 0,
1.98 christos 672: RLIM_INFINITY);
673: sbrelease(&so->so_snd, so);
1.160 ad 674: KASSERT(!cv_has_waiters(&so->so_cv));
675: KASSERT(!cv_has_waiters(&so->so_rcv.sb_cv));
676: KASSERT(!cv_has_waiters(&so->so_snd.sb_cv));
1.1 cgd 677: sorflush(so);
1.161 ad 678: refs = so->so_aborting; /* XXX */
1.177 ad 679: /* Remove acccept filter if one is present. */
1.170 tls 680: if (so->so_accf != NULL)
1.177 ad 681: (void)accept_filt_clear(so);
1.160 ad 682: sounlock(so);
1.161 ad 683: if (refs == 0) /* XXX */
684: soput(so);
1.1 cgd 685: }
686:
687: /*
688: * Close a socket on last file table reference removal.
689: * Initiate disconnect if connected.
690: * Free socket when disconnect complete.
691: */
1.3 andrew 692: int
1.54 lukem 693: soclose(struct socket *so)
1.1 cgd 694: {
1.54 lukem 695: struct socket *so2;
1.160 ad 696: int error;
697: int error2;
1.1 cgd 698:
1.54 lukem 699: error = 0;
1.160 ad 700: solock(so);
1.1 cgd 701: if (so->so_options & SO_ACCEPTCONN) {
1.172 ad 702: for (;;) {
703: if ((so2 = TAILQ_FIRST(&so->so_q0)) != 0) {
1.160 ad 704: KASSERT(solocked2(so, so2));
705: (void) soqremque(so2, 0);
706: /* soabort drops the lock. */
707: (void) soabort(so2);
708: solock(so);
1.172 ad 709: continue;
1.160 ad 710: }
1.172 ad 711: if ((so2 = TAILQ_FIRST(&so->so_q)) != 0) {
1.160 ad 712: KASSERT(solocked2(so, so2));
713: (void) soqremque(so2, 1);
714: /* soabort drops the lock. */
715: (void) soabort(so2);
716: solock(so);
1.172 ad 717: continue;
1.160 ad 718: }
1.172 ad 719: break;
720: }
1.1 cgd 721: }
722: if (so->so_pcb == 0)
723: goto discard;
724: if (so->so_state & SS_ISCONNECTED) {
725: if ((so->so_state & SS_ISDISCONNECTING) == 0) {
726: error = sodisconnect(so);
727: if (error)
728: goto drop;
729: }
730: if (so->so_options & SO_LINGER) {
1.206 christos 731: if ((so->so_state & (SS_ISDISCONNECTING|SS_NBIO)) ==
732: (SS_ISDISCONNECTING|SS_NBIO))
1.1 cgd 733: goto drop;
1.21 christos 734: while (so->so_state & SS_ISCONNECTED) {
1.185 yamt 735: error = sowait(so, true, so->so_linger * hz);
1.21 christos 736: if (error)
1.1 cgd 737: break;
1.21 christos 738: }
1.1 cgd 739: }
740: }
1.54 lukem 741: drop:
1.1 cgd 742: if (so->so_pcb) {
1.160 ad 743: error2 = (*so->so_proto->pr_usrreq)(so, PRU_DETACH,
1.140 dyoung 744: NULL, NULL, NULL, NULL);
1.1 cgd 745: if (error == 0)
746: error = error2;
747: }
1.54 lukem 748: discard:
1.1 cgd 749: if (so->so_state & SS_NOFDREF)
750: panic("soclose: NOFDREF");
1.198 elad 751: kauth_cred_free(so->so_cred);
1.1 cgd 752: so->so_state |= SS_NOFDREF;
753: sofree(so);
754: return (error);
755: }
756:
757: /*
1.160 ad 758: * Must be called with the socket locked.. Will return with it unlocked.
1.1 cgd 759: */
1.3 andrew 760: int
1.54 lukem 761: soabort(struct socket *so)
1.1 cgd 762: {
1.161 ad 763: u_int refs;
1.139 yamt 764: int error;
1.160 ad 765:
766: KASSERT(solocked(so));
767: KASSERT(so->so_head == NULL);
1.1 cgd 768:
1.161 ad 769: so->so_aborting++; /* XXX */
1.140 dyoung 770: error = (*so->so_proto->pr_usrreq)(so, PRU_ABORT, NULL,
771: NULL, NULL, NULL);
1.161 ad 772: refs = --so->so_aborting; /* XXX */
1.164 drochner 773: if (error || (refs == 0)) {
1.139 yamt 774: sofree(so);
1.160 ad 775: } else {
776: sounlock(so);
1.139 yamt 777: }
778: return error;
1.1 cgd 779: }
780:
1.3 andrew 781: int
1.54 lukem 782: soaccept(struct socket *so, struct mbuf *nam)
1.1 cgd 783: {
1.160 ad 784: int error;
785:
786: KASSERT(solocked(so));
1.1 cgd 787:
1.54 lukem 788: error = 0;
1.1 cgd 789: if ((so->so_state & SS_NOFDREF) == 0)
790: panic("soaccept: !NOFDREF");
791: so->so_state &= ~SS_NOFDREF;
1.55 thorpej 792: if ((so->so_state & SS_ISDISCONNECTED) == 0 ||
793: (so->so_proto->pr_flags & PR_ABRTACPTDIS) == 0)
1.41 mycroft 794: error = (*so->so_proto->pr_usrreq)(so, PRU_ACCEPT,
1.140 dyoung 795: NULL, nam, NULL, NULL);
1.41 mycroft 796: else
1.53 itojun 797: error = ECONNABORTED;
1.52 itojun 798:
1.1 cgd 799: return (error);
800: }
801:
1.3 andrew 802: int
1.114 christos 803: soconnect(struct socket *so, struct mbuf *nam, struct lwp *l)
1.1 cgd 804: {
1.160 ad 805: int error;
806:
807: KASSERT(solocked(so));
1.1 cgd 808:
809: if (so->so_options & SO_ACCEPTCONN)
810: return (EOPNOTSUPP);
811: /*
812: * If protocol is connection-based, can only connect once.
813: * Otherwise, if connected, try to disconnect first.
814: * This allows user to disconnect by connecting to, e.g.,
815: * a null address.
816: */
817: if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
818: ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
819: (error = sodisconnect(so))))
820: error = EISCONN;
821: else
822: error = (*so->so_proto->pr_usrreq)(so, PRU_CONNECT,
1.140 dyoung 823: NULL, nam, NULL, l);
1.1 cgd 824: return (error);
825: }
826:
1.3 andrew 827: int
1.54 lukem 828: soconnect2(struct socket *so1, struct socket *so2)
1.1 cgd 829: {
1.160 ad 830: int error;
831:
832: KASSERT(solocked2(so1, so2));
1.1 cgd 833:
1.22 mycroft 834: error = (*so1->so_proto->pr_usrreq)(so1, PRU_CONNECT2,
1.140 dyoung 835: NULL, (struct mbuf *)so2, NULL, NULL);
1.1 cgd 836: return (error);
837: }
838:
1.3 andrew 839: int
1.54 lukem 840: sodisconnect(struct socket *so)
1.1 cgd 841: {
1.160 ad 842: int error;
843:
844: KASSERT(solocked(so));
1.1 cgd 845:
846: if ((so->so_state & SS_ISCONNECTED) == 0) {
847: error = ENOTCONN;
1.160 ad 848: } else if (so->so_state & SS_ISDISCONNECTING) {
1.1 cgd 849: error = EALREADY;
1.160 ad 850: } else {
851: error = (*so->so_proto->pr_usrreq)(so, PRU_DISCONNECT,
852: NULL, NULL, NULL, NULL);
1.1 cgd 853: }
854: return (error);
855: }
856:
1.15 mycroft 857: #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK)
1.1 cgd 858: /*
859: * Send on a socket.
860: * If send must go all at once and message is larger than
861: * send buffering, then hard error.
862: * Lock against other senders.
863: * If must go all at once and not enough room now, then
864: * inform user that this would block and do nothing.
865: * Otherwise, if nonblocking, send as much as possible.
866: * The data to be sent is described by "uio" if nonzero,
867: * otherwise by the mbuf chain "top" (which must be null
868: * if uio is not). Data provided in mbuf chain must be small
869: * enough to send all at once.
870: *
871: * Returns nonzero on error, timeout or signal; callers
872: * must check for short counts if EINTR/ERESTART are returned.
873: * Data and control buffers are freed on return.
874: */
1.3 andrew 875: int
1.54 lukem 876: sosend(struct socket *so, struct mbuf *addr, struct uio *uio, struct mbuf *top,
1.114 christos 877: struct mbuf *control, int flags, struct lwp *l)
1.1 cgd 878: {
1.54 lukem 879: struct mbuf **mp, *m;
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:
1.160 ad 884: clen = 0;
1.64 thorpej 885:
1.160 ad 886: /*
887: * solock() provides atomicity of access. splsoftnet() prevents
888: * protocol processing soft interrupts from interrupting us and
889: * blocking (expensive).
890: */
891: s = splsoftnet();
892: solock(so);
1.54 lukem 893: atomic = sosendallatonce(so) || top;
1.1 cgd 894: if (uio)
895: resid = uio->uio_resid;
896: else
897: resid = top->m_pkthdr.len;
1.7 cgd 898: /*
899: * In theory resid should be unsigned.
900: * However, space must be signed, as it might be less than 0
901: * if we over-committed, and we must use a signed comparison
902: * of space and resid. On the other hand, a negative resid
903: * causes us to loop sending 0-length segments to the protocol.
904: */
1.29 mycroft 905: if (resid < 0) {
906: error = EINVAL;
907: goto out;
908: }
1.1 cgd 909: dontroute =
910: (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
911: (so->so_proto->pr_flags & PR_ATOMIC);
1.165 christos 912: l->l_ru.ru_msgsnd++;
1.1 cgd 913: if (control)
914: clen = control->m_len;
1.54 lukem 915: restart:
1.21 christos 916: if ((error = sblock(&so->so_snd, SBLOCKWAIT(flags))) != 0)
1.1 cgd 917: goto out;
918: do {
1.160 ad 919: if (so->so_state & SS_CANTSENDMORE) {
920: error = EPIPE;
921: goto release;
922: }
1.48 thorpej 923: if (so->so_error) {
924: error = so->so_error;
925: so->so_error = 0;
926: goto release;
927: }
1.1 cgd 928: if ((so->so_state & SS_ISCONNECTED) == 0) {
929: if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
1.217 ! rmind 930: if (resid || clen == 0) {
1.160 ad 931: error = ENOTCONN;
932: goto release;
933: }
934: } else if (addr == 0) {
935: error = EDESTADDRREQ;
936: goto release;
937: }
1.1 cgd 938: }
939: space = sbspace(&so->so_snd);
940: if (flags & MSG_OOB)
941: space += 1024;
1.21 christos 942: if ((atomic && resid > so->so_snd.sb_hiwat) ||
1.160 ad 943: clen > so->so_snd.sb_hiwat) {
944: error = EMSGSIZE;
945: goto release;
946: }
1.96 mycroft 947: if (space < resid + clen &&
1.1 cgd 948: (atomic || space < so->so_snd.sb_lowat || space < clen)) {
1.206 christos 949: if ((so->so_state & SS_NBIO) || (flags & MSG_NBIO)) {
1.160 ad 950: error = EWOULDBLOCK;
951: goto release;
952: }
1.1 cgd 953: sbunlock(&so->so_snd);
1.196 dsl 954: if (wakeup_state & SS_RESTARTSYS) {
955: error = ERESTART;
956: goto out;
957: }
1.1 cgd 958: error = sbwait(&so->so_snd);
959: if (error)
960: goto out;
1.196 dsl 961: wakeup_state = so->so_state;
1.1 cgd 962: goto restart;
963: }
1.196 dsl 964: wakeup_state = 0;
1.1 cgd 965: mp = ⊤
966: space -= clen;
967: do {
1.45 tv 968: if (uio == NULL) {
969: /*
970: * Data is prepackaged in "top".
971: */
972: resid = 0;
973: if (flags & MSG_EOR)
974: top->m_flags |= M_EOR;
975: } else do {
1.160 ad 976: sounlock(so);
977: splx(s);
1.144 dyoung 978: if (top == NULL) {
1.78 matt 979: m = m_gethdr(M_WAIT, MT_DATA);
1.45 tv 980: mlen = MHLEN;
981: m->m_pkthdr.len = 0;
1.140 dyoung 982: m->m_pkthdr.rcvif = NULL;
1.45 tv 983: } else {
1.78 matt 984: m = m_get(M_WAIT, MT_DATA);
1.45 tv 985: mlen = MLEN;
986: }
1.78 matt 987: MCLAIM(m, so->so_snd.sb_mowner);
1.121 yamt 988: if (sock_loan_thresh >= 0 &&
989: uio->uio_iov->iov_len >= sock_loan_thresh &&
990: space >= sock_loan_thresh &&
1.64 thorpej 991: (len = sosend_loan(so, uio, m,
992: space)) != 0) {
993: SOSEND_COUNTER_INCR(&sosend_loan_big);
994: space -= len;
995: goto have_data;
996: }
1.45 tv 997: if (resid >= MINCLSIZE && space >= MCLBYTES) {
1.64 thorpej 998: SOSEND_COUNTER_INCR(&sosend_copy_big);
1.201 oki 999: m_clget(m, M_DONTWAIT);
1.45 tv 1000: if ((m->m_flags & M_EXT) == 0)
1001: goto nopages;
1002: mlen = MCLBYTES;
1003: if (atomic && top == 0) {
1.58 jdolecek 1004: len = lmin(MCLBYTES - max_hdr,
1.54 lukem 1005: resid);
1.45 tv 1006: m->m_data += max_hdr;
1007: } else
1.58 jdolecek 1008: len = lmin(MCLBYTES, resid);
1.45 tv 1009: space -= len;
1010: } else {
1.64 thorpej 1011: nopages:
1012: SOSEND_COUNTER_INCR(&sosend_copy_small);
1.58 jdolecek 1013: len = lmin(lmin(mlen, resid), space);
1.45 tv 1014: space -= len;
1015: /*
1016: * For datagram protocols, leave room
1017: * for protocol headers in first mbuf.
1018: */
1019: if (atomic && top == 0 && len < mlen)
1020: MH_ALIGN(m, len);
1021: }
1.144 dyoung 1022: error = uiomove(mtod(m, void *), (int)len, uio);
1.64 thorpej 1023: have_data:
1.45 tv 1024: resid = uio->uio_resid;
1025: m->m_len = len;
1026: *mp = m;
1027: top->m_pkthdr.len += len;
1.160 ad 1028: s = splsoftnet();
1029: solock(so);
1.144 dyoung 1030: if (error != 0)
1.45 tv 1031: goto release;
1032: mp = &m->m_next;
1033: if (resid <= 0) {
1034: if (flags & MSG_EOR)
1035: top->m_flags |= M_EOR;
1036: break;
1037: }
1038: } while (space > 0 && atomic);
1.108 perry 1039:
1.160 ad 1040: if (so->so_state & SS_CANTSENDMORE) {
1041: error = EPIPE;
1042: goto release;
1043: }
1.45 tv 1044: if (dontroute)
1045: so->so_options |= SO_DONTROUTE;
1046: if (resid > 0)
1047: so->so_state |= SS_MORETOCOME;
1.46 sommerfe 1048: error = (*so->so_proto->pr_usrreq)(so,
1049: (flags & MSG_OOB) ? PRU_SENDOOB : PRU_SEND,
1.160 ad 1050: top, addr, control, curlwp);
1.45 tv 1051: if (dontroute)
1052: so->so_options &= ~SO_DONTROUTE;
1053: if (resid > 0)
1054: so->so_state &= ~SS_MORETOCOME;
1055: clen = 0;
1.144 dyoung 1056: control = NULL;
1057: top = NULL;
1.45 tv 1058: mp = ⊤
1.144 dyoung 1059: if (error != 0)
1.1 cgd 1060: goto release;
1061: } while (resid && space > 0);
1062: } while (resid);
1063:
1.54 lukem 1064: release:
1.1 cgd 1065: sbunlock(&so->so_snd);
1.54 lukem 1066: out:
1.160 ad 1067: sounlock(so);
1068: splx(s);
1.1 cgd 1069: if (top)
1070: m_freem(top);
1071: if (control)
1072: m_freem(control);
1073: return (error);
1074: }
1075:
1076: /*
1.159 ad 1077: * Following replacement or removal of the first mbuf on the first
1078: * mbuf chain of a socket buffer, push necessary state changes back
1079: * into the socket buffer so that other consumers see the values
1080: * consistently. 'nextrecord' is the callers locally stored value of
1081: * the original value of sb->sb_mb->m_nextpkt which must be restored
1082: * when the lead mbuf changes. NOTE: 'nextrecord' may be NULL.
1083: */
1084: static void
1085: sbsync(struct sockbuf *sb, struct mbuf *nextrecord)
1086: {
1087:
1.160 ad 1088: KASSERT(solocked(sb->sb_so));
1089:
1.159 ad 1090: /*
1091: * First, update for the new value of nextrecord. If necessary,
1092: * make it the first record.
1093: */
1094: if (sb->sb_mb != NULL)
1095: sb->sb_mb->m_nextpkt = nextrecord;
1096: else
1097: sb->sb_mb = nextrecord;
1098:
1099: /*
1100: * Now update any dependent socket buffer fields to reflect
1101: * the new state. This is an inline of SB_EMPTY_FIXUP, with
1102: * the addition of a second clause that takes care of the
1103: * case where sb_mb has been updated, but remains the last
1104: * record.
1105: */
1106: if (sb->sb_mb == NULL) {
1107: sb->sb_mbtail = NULL;
1108: sb->sb_lastrecord = NULL;
1109: } else if (sb->sb_mb->m_nextpkt == NULL)
1110: sb->sb_lastrecord = sb->sb_mb;
1111: }
1112:
1113: /*
1.1 cgd 1114: * Implement receive operations on a socket.
1115: * We depend on the way that records are added to the sockbuf
1116: * by sbappend*. In particular, each record (mbufs linked through m_next)
1117: * must begin with an address if the protocol so specifies,
1118: * followed by an optional mbuf or mbufs containing ancillary data,
1119: * and then zero or more mbufs of data.
1120: * In order to avoid blocking network interrupts for the entire time here,
1121: * we splx() while doing the actual copy to user space.
1122: * Although the sockbuf is locked, new data may still be appended,
1123: * and thus we must maintain consistency of the sockbuf during that time.
1124: *
1125: * The caller may receive the data as a single mbuf chain by supplying
1126: * an mbuf **mp0 for use in returning the chain. The uio is then used
1127: * only for the count in uio_resid.
1128: */
1.3 andrew 1129: int
1.54 lukem 1130: soreceive(struct socket *so, struct mbuf **paddr, struct uio *uio,
1131: struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
1.1 cgd 1132: {
1.116 yamt 1133: struct lwp *l = curlwp;
1.160 ad 1134: struct mbuf *m, **mp, *mt;
1.211 chs 1135: size_t len, offset, moff, orig_resid;
1136: int atomic, flags, error, s, type;
1.99 matt 1137: const struct protosw *pr;
1.54 lukem 1138: struct mbuf *nextrecord;
1.67 he 1139: int mbuf_removed = 0;
1.146 dyoung 1140: const struct domain *dom;
1.196 dsl 1141: short wakeup_state = 0;
1.64 thorpej 1142:
1.54 lukem 1143: pr = so->so_proto;
1.146 dyoung 1144: atomic = pr->pr_flags & PR_ATOMIC;
1145: dom = pr->pr_domain;
1.1 cgd 1146: mp = mp0;
1.54 lukem 1147: type = 0;
1148: orig_resid = uio->uio_resid;
1.102 jonathan 1149:
1.144 dyoung 1150: if (paddr != NULL)
1151: *paddr = NULL;
1152: if (controlp != NULL)
1153: *controlp = NULL;
1154: if (flagsp != NULL)
1.1 cgd 1155: flags = *flagsp &~ MSG_EOR;
1156: else
1157: flags = 0;
1.66 enami 1158:
1.1 cgd 1159: if (flags & MSG_OOB) {
1160: m = m_get(M_WAIT, MT_DATA);
1.160 ad 1161: solock(so);
1.17 cgd 1162: error = (*pr->pr_usrreq)(so, PRU_RCVOOB, m,
1.140 dyoung 1163: (struct mbuf *)(long)(flags & MSG_PEEK), NULL, l);
1.160 ad 1164: sounlock(so);
1.1 cgd 1165: if (error)
1166: goto bad;
1167: do {
1.134 christos 1168: error = uiomove(mtod(m, void *),
1.211 chs 1169: MIN(uio->uio_resid, m->m_len), uio);
1.1 cgd 1170: m = m_free(m);
1.144 dyoung 1171: } while (uio->uio_resid > 0 && error == 0 && m);
1.54 lukem 1172: bad:
1.144 dyoung 1173: if (m != NULL)
1.1 cgd 1174: m_freem(m);
1.144 dyoung 1175: return error;
1.1 cgd 1176: }
1.144 dyoung 1177: if (mp != NULL)
1.140 dyoung 1178: *mp = NULL;
1.160 ad 1179:
1180: /*
1181: * solock() provides atomicity of access. splsoftnet() prevents
1182: * protocol processing soft interrupts from interrupting us and
1183: * blocking (expensive).
1184: */
1185: s = splsoftnet();
1186: solock(so);
1.54 lukem 1187: restart:
1.160 ad 1188: if ((error = sblock(&so->so_rcv, SBLOCKWAIT(flags))) != 0) {
1189: sounlock(so);
1190: splx(s);
1.144 dyoung 1191: return error;
1.160 ad 1192: }
1.1 cgd 1193:
1194: m = so->so_rcv.sb_mb;
1195: /*
1196: * If we have less data than requested, block awaiting more
1197: * (subject to any timeout) if:
1.15 mycroft 1198: * 1. the current count is less than the low water mark,
1.1 cgd 1199: * 2. MSG_WAITALL is set, and it is possible to do the entire
1.15 mycroft 1200: * receive operation at once if we block (resid <= hiwat), or
1201: * 3. MSG_DONTWAIT is not set.
1.1 cgd 1202: * If MSG_WAITALL is set but resid is larger than the receive buffer,
1203: * we have to do the receive in sections, and thus risk returning
1204: * a short count if a timeout or signal occurs after we start.
1205: */
1.144 dyoung 1206: if (m == NULL ||
1207: ((flags & MSG_DONTWAIT) == 0 &&
1208: so->so_rcv.sb_cc < uio->uio_resid &&
1209: (so->so_rcv.sb_cc < so->so_rcv.sb_lowat ||
1210: ((flags & MSG_WAITALL) &&
1211: uio->uio_resid <= so->so_rcv.sb_hiwat)) &&
1.146 dyoung 1212: m->m_nextpkt == NULL && !atomic)) {
1.1 cgd 1213: #ifdef DIAGNOSTIC
1.144 dyoung 1214: if (m == NULL && so->so_rcv.sb_cc)
1.1 cgd 1215: panic("receive 1");
1216: #endif
1217: if (so->so_error) {
1.144 dyoung 1218: if (m != NULL)
1.15 mycroft 1219: goto dontblock;
1.1 cgd 1220: error = so->so_error;
1221: if ((flags & MSG_PEEK) == 0)
1222: so->so_error = 0;
1223: goto release;
1224: }
1225: if (so->so_state & SS_CANTRCVMORE) {
1.144 dyoung 1226: if (m != NULL)
1.15 mycroft 1227: goto dontblock;
1.1 cgd 1228: else
1229: goto release;
1230: }
1.144 dyoung 1231: for (; m != NULL; m = m->m_next)
1.1 cgd 1232: if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) {
1233: m = so->so_rcv.sb_mb;
1234: goto dontblock;
1235: }
1236: if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
1237: (so->so_proto->pr_flags & PR_CONNREQUIRED)) {
1238: error = ENOTCONN;
1239: goto release;
1240: }
1241: if (uio->uio_resid == 0)
1242: goto release;
1.206 christos 1243: if ((so->so_state & SS_NBIO) ||
1244: (flags & (MSG_DONTWAIT|MSG_NBIO))) {
1.1 cgd 1245: error = EWOULDBLOCK;
1246: goto release;
1247: }
1.69 thorpej 1248: SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 1");
1249: SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 1");
1.1 cgd 1250: sbunlock(&so->so_rcv);
1.196 dsl 1251: if (wakeup_state & SS_RESTARTSYS)
1252: error = ERESTART;
1253: else
1254: error = sbwait(&so->so_rcv);
1.160 ad 1255: if (error != 0) {
1256: sounlock(so);
1257: splx(s);
1.144 dyoung 1258: return error;
1.160 ad 1259: }
1.196 dsl 1260: wakeup_state = so->so_state;
1.1 cgd 1261: goto restart;
1262: }
1.54 lukem 1263: dontblock:
1.69 thorpej 1264: /*
1265: * On entry here, m points to the first record of the socket buffer.
1.159 ad 1266: * From this point onward, we maintain 'nextrecord' as a cache of the
1267: * pointer to the next record in the socket buffer. We must keep the
1268: * various socket buffer pointers and local stack versions of the
1269: * pointers in sync, pushing out modifications before dropping the
1.160 ad 1270: * socket lock, and re-reading them when picking it up.
1.159 ad 1271: *
1272: * Otherwise, we will race with the network stack appending new data
1273: * or records onto the socket buffer by using inconsistent/stale
1274: * versions of the field, possibly resulting in socket buffer
1275: * corruption.
1276: *
1277: * By holding the high-level sblock(), we prevent simultaneous
1278: * readers from pulling off the front of the socket buffer.
1.69 thorpej 1279: */
1.144 dyoung 1280: if (l != NULL)
1.157 ad 1281: l->l_ru.ru_msgrcv++;
1.69 thorpej 1282: KASSERT(m == so->so_rcv.sb_mb);
1283: SBLASTRECORDCHK(&so->so_rcv, "soreceive 1");
1284: SBLASTMBUFCHK(&so->so_rcv, "soreceive 1");
1.1 cgd 1285: nextrecord = m->m_nextpkt;
1286: if (pr->pr_flags & PR_ADDR) {
1287: #ifdef DIAGNOSTIC
1288: if (m->m_type != MT_SONAME)
1289: panic("receive 1a");
1290: #endif
1.3 andrew 1291: orig_resid = 0;
1.1 cgd 1292: if (flags & MSG_PEEK) {
1293: if (paddr)
1294: *paddr = m_copy(m, 0, m->m_len);
1295: m = m->m_next;
1296: } else {
1297: sbfree(&so->so_rcv, m);
1.67 he 1298: mbuf_removed = 1;
1.144 dyoung 1299: if (paddr != NULL) {
1.1 cgd 1300: *paddr = m;
1301: so->so_rcv.sb_mb = m->m_next;
1.144 dyoung 1302: m->m_next = NULL;
1.1 cgd 1303: m = so->so_rcv.sb_mb;
1304: } else {
1305: MFREE(m, so->so_rcv.sb_mb);
1306: m = so->so_rcv.sb_mb;
1307: }
1.159 ad 1308: sbsync(&so->so_rcv, nextrecord);
1.1 cgd 1309: }
1310: }
1.159 ad 1311:
1312: /*
1313: * Process one or more MT_CONTROL mbufs present before any data mbufs
1314: * in the first mbuf chain on the socket buffer. If MSG_PEEK, we
1315: * just copy the data; if !MSG_PEEK, we call into the protocol to
1316: * perform externalization (or freeing if controlp == NULL).
1317: */
1318: if (__predict_false(m != NULL && m->m_type == MT_CONTROL)) {
1319: struct mbuf *cm = NULL, *cmn;
1320: struct mbuf **cme = &cm;
1321:
1322: do {
1323: if (flags & MSG_PEEK) {
1324: if (controlp != NULL) {
1325: *controlp = m_copy(m, 0, m->m_len);
1326: controlp = &(*controlp)->m_next;
1327: }
1328: m = m->m_next;
1329: } else {
1330: sbfree(&so->so_rcv, m);
1.1 cgd 1331: so->so_rcv.sb_mb = m->m_next;
1.144 dyoung 1332: m->m_next = NULL;
1.159 ad 1333: *cme = m;
1334: cme = &(*cme)->m_next;
1.1 cgd 1335: m = so->so_rcv.sb_mb;
1.159 ad 1336: }
1337: } while (m != NULL && m->m_type == MT_CONTROL);
1338: if ((flags & MSG_PEEK) == 0)
1339: sbsync(&so->so_rcv, nextrecord);
1340: for (; cm != NULL; cm = cmn) {
1341: cmn = cm->m_next;
1342: cm->m_next = NULL;
1343: type = mtod(cm, struct cmsghdr *)->cmsg_type;
1344: if (controlp != NULL) {
1345: if (dom->dom_externalize != NULL &&
1346: type == SCM_RIGHTS) {
1.160 ad 1347: sounlock(so);
1.159 ad 1348: splx(s);
1.204 christos 1349: error = (*dom->dom_externalize)(cm, l,
1350: (flags & MSG_CMSG_CLOEXEC) ?
1351: O_CLOEXEC : 0);
1.159 ad 1352: s = splsoftnet();
1.160 ad 1353: solock(so);
1.159 ad 1354: }
1355: *controlp = cm;
1356: while (*controlp != NULL)
1357: controlp = &(*controlp)->m_next;
1.1 cgd 1358: } else {
1.106 itojun 1359: /*
1360: * Dispose of any SCM_RIGHTS message that went
1361: * through the read path rather than recv.
1362: */
1.159 ad 1363: if (dom->dom_dispose != NULL &&
1364: type == SCM_RIGHTS) {
1.160 ad 1365: sounlock(so);
1.159 ad 1366: (*dom->dom_dispose)(cm);
1.160 ad 1367: solock(so);
1.159 ad 1368: }
1369: m_freem(cm);
1.1 cgd 1370: }
1371: }
1.159 ad 1372: if (m != NULL)
1373: nextrecord = so->so_rcv.sb_mb->m_nextpkt;
1374: else
1375: nextrecord = so->so_rcv.sb_mb;
1376: orig_resid = 0;
1.1 cgd 1377: }
1.69 thorpej 1378:
1.159 ad 1379: /* If m is non-NULL, we have some data to read. */
1380: if (__predict_true(m != NULL)) {
1.1 cgd 1381: type = m->m_type;
1382: if (type == MT_OOBDATA)
1383: flags |= MSG_OOB;
1384: }
1.69 thorpej 1385: SBLASTRECORDCHK(&so->so_rcv, "soreceive 2");
1386: SBLASTMBUFCHK(&so->so_rcv, "soreceive 2");
1387:
1.1 cgd 1388: moff = 0;
1389: offset = 0;
1.144 dyoung 1390: while (m != NULL && uio->uio_resid > 0 && error == 0) {
1.1 cgd 1391: if (m->m_type == MT_OOBDATA) {
1392: if (type != MT_OOBDATA)
1393: break;
1394: } else if (type == MT_OOBDATA)
1395: break;
1396: #ifdef DIAGNOSTIC
1397: else if (m->m_type != MT_DATA && m->m_type != MT_HEADER)
1398: panic("receive 3");
1399: #endif
1400: so->so_state &= ~SS_RCVATMARK;
1.196 dsl 1401: wakeup_state = 0;
1.1 cgd 1402: len = uio->uio_resid;
1403: if (so->so_oobmark && len > so->so_oobmark - offset)
1404: len = so->so_oobmark - offset;
1405: if (len > m->m_len - moff)
1406: len = m->m_len - moff;
1407: /*
1408: * If mp is set, just pass back the mbufs.
1409: * Otherwise copy them out via the uio, then free.
1410: * Sockbuf must be consistent here (points to current mbuf,
1411: * it points to next record) when we drop priority;
1412: * we must note any additions to the sockbuf when we
1413: * block interrupts again.
1414: */
1.144 dyoung 1415: if (mp == NULL) {
1.69 thorpej 1416: SBLASTRECORDCHK(&so->so_rcv, "soreceive uiomove");
1417: SBLASTMBUFCHK(&so->so_rcv, "soreceive uiomove");
1.160 ad 1418: sounlock(so);
1.1 cgd 1419: splx(s);
1.211 chs 1420: error = uiomove(mtod(m, char *) + moff, len, uio);
1.20 mycroft 1421: s = splsoftnet();
1.160 ad 1422: solock(so);
1.144 dyoung 1423: if (error != 0) {
1.67 he 1424: /*
1425: * If any part of the record has been removed
1426: * (such as the MT_SONAME mbuf, which will
1427: * happen when PR_ADDR, and thus also
1428: * PR_ATOMIC, is set), then drop the entire
1429: * record to maintain the atomicity of the
1430: * receive operation.
1431: *
1432: * This avoids a later panic("receive 1a")
1433: * when compiled with DIAGNOSTIC.
1434: */
1.146 dyoung 1435: if (m && mbuf_removed && atomic)
1.67 he 1436: (void) sbdroprecord(&so->so_rcv);
1437:
1.57 jdolecek 1438: goto release;
1.67 he 1439: }
1.1 cgd 1440: } else
1441: uio->uio_resid -= len;
1442: if (len == m->m_len - moff) {
1443: if (m->m_flags & M_EOR)
1444: flags |= MSG_EOR;
1445: if (flags & MSG_PEEK) {
1446: m = m->m_next;
1447: moff = 0;
1448: } else {
1449: nextrecord = m->m_nextpkt;
1450: sbfree(&so->so_rcv, m);
1451: if (mp) {
1452: *mp = m;
1453: mp = &m->m_next;
1454: so->so_rcv.sb_mb = m = m->m_next;
1.140 dyoung 1455: *mp = NULL;
1.1 cgd 1456: } else {
1457: MFREE(m, so->so_rcv.sb_mb);
1458: m = so->so_rcv.sb_mb;
1459: }
1.69 thorpej 1460: /*
1461: * If m != NULL, we also know that
1462: * so->so_rcv.sb_mb != NULL.
1463: */
1464: KASSERT(so->so_rcv.sb_mb == m);
1465: if (m) {
1.1 cgd 1466: m->m_nextpkt = nextrecord;
1.69 thorpej 1467: if (nextrecord == NULL)
1468: so->so_rcv.sb_lastrecord = m;
1469: } else {
1470: so->so_rcv.sb_mb = nextrecord;
1.70 thorpej 1471: SB_EMPTY_FIXUP(&so->so_rcv);
1.69 thorpej 1472: }
1473: SBLASTRECORDCHK(&so->so_rcv, "soreceive 3");
1474: SBLASTMBUFCHK(&so->so_rcv, "soreceive 3");
1.1 cgd 1475: }
1.144 dyoung 1476: } else if (flags & MSG_PEEK)
1477: moff += len;
1478: else {
1.160 ad 1479: if (mp != NULL) {
1480: mt = m_copym(m, 0, len, M_NOWAIT);
1481: if (__predict_false(mt == NULL)) {
1482: sounlock(so);
1483: mt = m_copym(m, 0, len, M_WAIT);
1484: solock(so);
1485: }
1486: *mp = mt;
1487: }
1.144 dyoung 1488: m->m_data += len;
1489: m->m_len -= len;
1490: so->so_rcv.sb_cc -= len;
1.1 cgd 1491: }
1492: if (so->so_oobmark) {
1493: if ((flags & MSG_PEEK) == 0) {
1494: so->so_oobmark -= len;
1495: if (so->so_oobmark == 0) {
1496: so->so_state |= SS_RCVATMARK;
1497: break;
1498: }
1.7 cgd 1499: } else {
1.1 cgd 1500: offset += len;
1.7 cgd 1501: if (offset == so->so_oobmark)
1502: break;
1503: }
1.1 cgd 1504: }
1505: if (flags & MSG_EOR)
1506: break;
1507: /*
1508: * If the MSG_WAITALL flag is set (for non-atomic socket),
1509: * we must not quit until "uio->uio_resid == 0" or an error
1510: * termination. If a signal/timeout occurs, return
1511: * with a short count but without error.
1512: * Keep sockbuf locked against other readers.
1513: */
1.144 dyoung 1514: while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 &&
1.3 andrew 1515: !sosendallatonce(so) && !nextrecord) {
1.1 cgd 1516: if (so->so_error || so->so_state & SS_CANTRCVMORE)
1517: break;
1.68 matt 1518: /*
1519: * If we are peeking and the socket receive buffer is
1520: * full, stop since we can't get more data to peek at.
1521: */
1522: if ((flags & MSG_PEEK) && sbspace(&so->so_rcv) <= 0)
1523: break;
1524: /*
1525: * If we've drained the socket buffer, tell the
1526: * protocol in case it needs to do something to
1527: * get it filled again.
1528: */
1529: if ((pr->pr_flags & PR_WANTRCVD) && so->so_pcb)
1530: (*pr->pr_usrreq)(so, PRU_RCVD,
1.140 dyoung 1531: NULL, (struct mbuf *)(long)flags, NULL, l);
1.69 thorpej 1532: SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 2");
1533: SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 2");
1.196 dsl 1534: if (wakeup_state & SS_RESTARTSYS)
1535: error = ERESTART;
1536: else
1537: error = sbwait(&so->so_rcv);
1.144 dyoung 1538: if (error != 0) {
1.1 cgd 1539: sbunlock(&so->so_rcv);
1.160 ad 1540: sounlock(so);
1.1 cgd 1541: splx(s);
1.144 dyoung 1542: return 0;
1.1 cgd 1543: }
1.21 christos 1544: if ((m = so->so_rcv.sb_mb) != NULL)
1.1 cgd 1545: nextrecord = m->m_nextpkt;
1.196 dsl 1546: wakeup_state = so->so_state;
1.1 cgd 1547: }
1548: }
1.3 andrew 1549:
1.146 dyoung 1550: if (m && atomic) {
1.3 andrew 1551: flags |= MSG_TRUNC;
1552: if ((flags & MSG_PEEK) == 0)
1553: (void) sbdroprecord(&so->so_rcv);
1554: }
1.1 cgd 1555: if ((flags & MSG_PEEK) == 0) {
1.144 dyoung 1556: if (m == NULL) {
1.69 thorpej 1557: /*
1.70 thorpej 1558: * First part is an inline SB_EMPTY_FIXUP(). Second
1.69 thorpej 1559: * part makes sure sb_lastrecord is up-to-date if
1560: * there is still data in the socket buffer.
1561: */
1.1 cgd 1562: so->so_rcv.sb_mb = nextrecord;
1.69 thorpej 1563: if (so->so_rcv.sb_mb == NULL) {
1564: so->so_rcv.sb_mbtail = NULL;
1565: so->so_rcv.sb_lastrecord = NULL;
1566: } else if (nextrecord->m_nextpkt == NULL)
1567: so->so_rcv.sb_lastrecord = nextrecord;
1568: }
1569: SBLASTRECORDCHK(&so->so_rcv, "soreceive 4");
1570: SBLASTMBUFCHK(&so->so_rcv, "soreceive 4");
1.1 cgd 1571: if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
1.140 dyoung 1572: (*pr->pr_usrreq)(so, PRU_RCVD, NULL,
1573: (struct mbuf *)(long)flags, NULL, l);
1.1 cgd 1574: }
1.3 andrew 1575: if (orig_resid == uio->uio_resid && orig_resid &&
1576: (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) {
1577: sbunlock(&so->so_rcv);
1578: goto restart;
1579: }
1.108 perry 1580:
1.144 dyoung 1581: if (flagsp != NULL)
1.1 cgd 1582: *flagsp |= flags;
1.54 lukem 1583: release:
1.1 cgd 1584: sbunlock(&so->so_rcv);
1.160 ad 1585: sounlock(so);
1.1 cgd 1586: splx(s);
1.144 dyoung 1587: return error;
1.1 cgd 1588: }
1589:
1.14 mycroft 1590: int
1.54 lukem 1591: soshutdown(struct socket *so, int how)
1.1 cgd 1592: {
1.99 matt 1593: const struct protosw *pr;
1.160 ad 1594: int error;
1595:
1596: KASSERT(solocked(so));
1.34 kleink 1597:
1.54 lukem 1598: pr = so->so_proto;
1.34 kleink 1599: if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR))
1600: return (EINVAL);
1.1 cgd 1601:
1.160 ad 1602: if (how == SHUT_RD || how == SHUT_RDWR) {
1.1 cgd 1603: sorflush(so);
1.160 ad 1604: error = 0;
1605: }
1.34 kleink 1606: if (how == SHUT_WR || how == SHUT_RDWR)
1.160 ad 1607: error = (*pr->pr_usrreq)(so, PRU_SHUTDOWN, NULL,
1.140 dyoung 1608: NULL, NULL, NULL);
1.160 ad 1609:
1610: return error;
1.1 cgd 1611: }
1612:
1.195 dsl 1613: void
1.196 dsl 1614: sorestart(struct socket *so)
1.188 ad 1615: {
1.196 dsl 1616: /*
1617: * An application has called close() on an fd on which another
1618: * of its threads has called a socket system call.
1619: * Mark this and wake everyone up, and code that would block again
1620: * instead returns ERESTART.
1621: * On system call re-entry the fd is validated and EBADF returned.
1622: * Any other fd will block again on the 2nd syscall.
1623: */
1.188 ad 1624: solock(so);
1.196 dsl 1625: so->so_state |= SS_RESTARTSYS;
1.188 ad 1626: cv_broadcast(&so->so_cv);
1.196 dsl 1627: cv_broadcast(&so->so_snd.sb_cv);
1628: cv_broadcast(&so->so_rcv.sb_cv);
1.188 ad 1629: sounlock(so);
1630: }
1631:
1.14 mycroft 1632: void
1.54 lukem 1633: sorflush(struct socket *so)
1.1 cgd 1634: {
1.54 lukem 1635: struct sockbuf *sb, asb;
1.99 matt 1636: const struct protosw *pr;
1.160 ad 1637:
1638: KASSERT(solocked(so));
1.1 cgd 1639:
1.54 lukem 1640: sb = &so->so_rcv;
1641: pr = so->so_proto;
1.160 ad 1642: socantrcvmore(so);
1.1 cgd 1643: sb->sb_flags |= SB_NOINTR;
1.160 ad 1644: (void )sblock(sb, M_WAITOK);
1.1 cgd 1645: sbunlock(sb);
1646: asb = *sb;
1.86 wrstuden 1647: /*
1648: * Clear most of the sockbuf structure, but leave some of the
1649: * fields valid.
1650: */
1651: memset(&sb->sb_startzero, 0,
1652: sizeof(*sb) - offsetof(struct sockbuf, sb_startzero));
1.160 ad 1653: if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose) {
1654: sounlock(so);
1.1 cgd 1655: (*pr->pr_domain->dom_dispose)(asb.sb_mb);
1.160 ad 1656: solock(so);
1657: }
1.98 christos 1658: sbrelease(&asb, so);
1.1 cgd 1659: }
1660:
1.171 plunky 1661: /*
1662: * internal set SOL_SOCKET options
1663: */
1.142 dyoung 1664: static int
1.171 plunky 1665: sosetopt1(struct socket *so, const struct sockopt *sopt)
1.1 cgd 1666: {
1.182 christos 1667: int error = EINVAL, optval, opt;
1.171 plunky 1668: struct linger l;
1669: struct timeval tv;
1.142 dyoung 1670:
1.179 christos 1671: switch ((opt = sopt->sopt_name)) {
1.142 dyoung 1672:
1.170 tls 1673: case SO_ACCEPTFILTER:
1.177 ad 1674: error = accept_filt_setopt(so, sopt);
1675: KASSERT(solocked(so));
1.170 tls 1676: break;
1677:
1.171 plunky 1678: case SO_LINGER:
1679: error = sockopt_get(sopt, &l, sizeof(l));
1.177 ad 1680: solock(so);
1.171 plunky 1681: if (error)
1.177 ad 1682: break;
1.171 plunky 1683: if (l.l_linger < 0 || l.l_linger > USHRT_MAX ||
1.177 ad 1684: l.l_linger > (INT_MAX / hz)) {
1685: error = EDOM;
1686: break;
1687: }
1.171 plunky 1688: so->so_linger = l.l_linger;
1689: if (l.l_onoff)
1690: so->so_options |= SO_LINGER;
1691: else
1692: so->so_options &= ~SO_LINGER;
1.177 ad 1693: break;
1.1 cgd 1694:
1.142 dyoung 1695: case SO_DEBUG:
1696: case SO_KEEPALIVE:
1697: case SO_DONTROUTE:
1698: case SO_USELOOPBACK:
1699: case SO_BROADCAST:
1700: case SO_REUSEADDR:
1701: case SO_REUSEPORT:
1702: case SO_OOBINLINE:
1703: case SO_TIMESTAMP:
1.207 christos 1704: case SO_NOSIGPIPE:
1.184 christos 1705: #ifdef SO_OTIMESTAMP
1706: case SO_OTIMESTAMP:
1707: #endif
1.171 plunky 1708: error = sockopt_getint(sopt, &optval);
1.177 ad 1709: solock(so);
1.171 plunky 1710: if (error)
1.177 ad 1711: break;
1.171 plunky 1712: if (optval)
1.179 christos 1713: so->so_options |= opt;
1.142 dyoung 1714: else
1.179 christos 1715: so->so_options &= ~opt;
1.142 dyoung 1716: break;
1717:
1718: case SO_SNDBUF:
1719: case SO_RCVBUF:
1720: case SO_SNDLOWAT:
1721: case SO_RCVLOWAT:
1.171 plunky 1722: error = sockopt_getint(sopt, &optval);
1.177 ad 1723: solock(so);
1.171 plunky 1724: if (error)
1.177 ad 1725: break;
1.1 cgd 1726:
1.142 dyoung 1727: /*
1728: * Values < 1 make no sense for any of these
1729: * options, so disallow them.
1730: */
1.177 ad 1731: if (optval < 1) {
1732: error = EINVAL;
1733: break;
1734: }
1.1 cgd 1735:
1.179 christos 1736: switch (opt) {
1.171 plunky 1737: case SO_SNDBUF:
1.177 ad 1738: if (sbreserve(&so->so_snd, (u_long)optval, so) == 0) {
1739: error = ENOBUFS;
1740: break;
1741: }
1.171 plunky 1742: so->so_snd.sb_flags &= ~SB_AUTOSIZE;
1743: break;
1.1 cgd 1744:
1745: case SO_RCVBUF:
1.177 ad 1746: if (sbreserve(&so->so_rcv, (u_long)optval, so) == 0) {
1747: error = ENOBUFS;
1748: break;
1749: }
1.171 plunky 1750: so->so_rcv.sb_flags &= ~SB_AUTOSIZE;
1.142 dyoung 1751: break;
1752:
1753: /*
1754: * Make sure the low-water is never greater than
1755: * the high-water.
1756: */
1.1 cgd 1757: case SO_SNDLOWAT:
1.171 plunky 1758: if (optval > so->so_snd.sb_hiwat)
1759: optval = so->so_snd.sb_hiwat;
1760:
1761: so->so_snd.sb_lowat = optval;
1.142 dyoung 1762: break;
1.171 plunky 1763:
1.1 cgd 1764: case SO_RCVLOWAT:
1.171 plunky 1765: if (optval > so->so_rcv.sb_hiwat)
1766: optval = so->so_rcv.sb_hiwat;
1767:
1768: so->so_rcv.sb_lowat = optval;
1.142 dyoung 1769: break;
1770: }
1771: break;
1.28 thorpej 1772:
1.179 christos 1773: #ifdef COMPAT_50
1774: case SO_OSNDTIMEO:
1775: case SO_ORCVTIMEO: {
1776: struct timeval50 otv;
1777: error = sockopt_get(sopt, &otv, sizeof(otv));
1.186 pooka 1778: if (error) {
1779: solock(so);
1.183 christos 1780: break;
1.186 pooka 1781: }
1.179 christos 1782: timeval50_to_timeval(&otv, &tv);
1783: opt = opt == SO_OSNDTIMEO ? SO_SNDTIMEO : SO_RCVTIMEO;
1.182 christos 1784: error = 0;
1.179 christos 1785: /*FALLTHROUGH*/
1786: }
1787: #endif /* COMPAT_50 */
1788:
1.142 dyoung 1789: case SO_SNDTIMEO:
1790: case SO_RCVTIMEO:
1.182 christos 1791: if (error)
1.179 christos 1792: error = sockopt_get(sopt, &tv, sizeof(tv));
1.177 ad 1793: solock(so);
1.171 plunky 1794: if (error)
1.177 ad 1795: break;
1.171 plunky 1796:
1.177 ad 1797: if (tv.tv_sec > (INT_MAX - tv.tv_usec / tick) / hz) {
1798: error = EDOM;
1799: break;
1800: }
1.28 thorpej 1801:
1.171 plunky 1802: optval = tv.tv_sec * hz + tv.tv_usec / tick;
1803: if (optval == 0 && tv.tv_usec != 0)
1804: optval = 1;
1.28 thorpej 1805:
1.179 christos 1806: switch (opt) {
1.142 dyoung 1807: case SO_SNDTIMEO:
1.171 plunky 1808: so->so_snd.sb_timeo = optval;
1.1 cgd 1809: break;
1810: case SO_RCVTIMEO:
1.171 plunky 1811: so->so_rcv.sb_timeo = optval;
1.142 dyoung 1812: break;
1813: }
1814: break;
1.1 cgd 1815:
1.142 dyoung 1816: default:
1.177 ad 1817: solock(so);
1818: error = ENOPROTOOPT;
1819: break;
1.142 dyoung 1820: }
1.177 ad 1821: KASSERT(solocked(so));
1822: return error;
1.142 dyoung 1823: }
1.1 cgd 1824:
1.142 dyoung 1825: int
1.171 plunky 1826: sosetopt(struct socket *so, struct sockopt *sopt)
1.142 dyoung 1827: {
1828: int error, prerr;
1.1 cgd 1829:
1.177 ad 1830: if (sopt->sopt_level == SOL_SOCKET) {
1.171 plunky 1831: error = sosetopt1(so, sopt);
1.177 ad 1832: KASSERT(solocked(so));
1833: } else {
1.142 dyoung 1834: error = ENOPROTOOPT;
1.177 ad 1835: solock(so);
1836: }
1.1 cgd 1837:
1.142 dyoung 1838: if ((error == 0 || error == ENOPROTOOPT) &&
1839: so->so_proto != NULL && so->so_proto->pr_ctloutput != NULL) {
1840: /* give the protocol stack a shot */
1.171 plunky 1841: prerr = (*so->so_proto->pr_ctloutput)(PRCO_SETOPT, so, sopt);
1.142 dyoung 1842: if (prerr == 0)
1843: error = 0;
1844: else if (prerr != ENOPROTOOPT)
1845: error = prerr;
1.171 plunky 1846: }
1.160 ad 1847: sounlock(so);
1.142 dyoung 1848: return error;
1.1 cgd 1849: }
1850:
1.171 plunky 1851: /*
1852: * so_setsockopt() is a wrapper providing a sockopt structure for sosetopt()
1853: */
1854: int
1855: so_setsockopt(struct lwp *l, struct socket *so, int level, int name,
1856: const void *val, size_t valsize)
1857: {
1858: struct sockopt sopt;
1859: int error;
1860:
1861: KASSERT(valsize == 0 || val != NULL);
1862:
1863: sockopt_init(&sopt, level, name, valsize);
1864: sockopt_set(&sopt, val, valsize);
1865:
1866: error = sosetopt(so, &sopt);
1867:
1868: sockopt_destroy(&sopt);
1869:
1870: return error;
1871: }
1872:
1873: /*
1874: * internal get SOL_SOCKET options
1875: */
1876: static int
1877: sogetopt1(struct socket *so, struct sockopt *sopt)
1878: {
1.179 christos 1879: int error, optval, opt;
1.171 plunky 1880: struct linger l;
1881: struct timeval tv;
1882:
1.179 christos 1883: switch ((opt = sopt->sopt_name)) {
1.171 plunky 1884:
1885: case SO_ACCEPTFILTER:
1.177 ad 1886: error = accept_filt_getopt(so, sopt);
1.171 plunky 1887: break;
1888:
1889: case SO_LINGER:
1890: l.l_onoff = (so->so_options & SO_LINGER) ? 1 : 0;
1891: l.l_linger = so->so_linger;
1892:
1893: error = sockopt_set(sopt, &l, sizeof(l));
1894: break;
1895:
1896: case SO_USELOOPBACK:
1897: case SO_DONTROUTE:
1898: case SO_DEBUG:
1899: case SO_KEEPALIVE:
1900: case SO_REUSEADDR:
1901: case SO_REUSEPORT:
1902: case SO_BROADCAST:
1903: case SO_OOBINLINE:
1904: case SO_TIMESTAMP:
1.207 christos 1905: case SO_NOSIGPIPE:
1.184 christos 1906: #ifdef SO_OTIMESTAMP
1907: case SO_OTIMESTAMP:
1908: #endif
1.179 christos 1909: error = sockopt_setint(sopt, (so->so_options & opt) ? 1 : 0);
1.171 plunky 1910: break;
1911:
1912: case SO_TYPE:
1913: error = sockopt_setint(sopt, so->so_type);
1914: break;
1915:
1916: case SO_ERROR:
1917: error = sockopt_setint(sopt, so->so_error);
1918: so->so_error = 0;
1919: break;
1920:
1921: case SO_SNDBUF:
1922: error = sockopt_setint(sopt, so->so_snd.sb_hiwat);
1923: break;
1924:
1925: case SO_RCVBUF:
1926: error = sockopt_setint(sopt, so->so_rcv.sb_hiwat);
1927: break;
1928:
1929: case SO_SNDLOWAT:
1930: error = sockopt_setint(sopt, so->so_snd.sb_lowat);
1931: break;
1932:
1933: case SO_RCVLOWAT:
1934: error = sockopt_setint(sopt, so->so_rcv.sb_lowat);
1935: break;
1936:
1.179 christos 1937: #ifdef COMPAT_50
1938: case SO_OSNDTIMEO:
1939: case SO_ORCVTIMEO: {
1940: struct timeval50 otv;
1941:
1942: optval = (opt == SO_OSNDTIMEO ?
1943: so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
1944:
1945: otv.tv_sec = optval / hz;
1946: otv.tv_usec = (optval % hz) * tick;
1947:
1948: error = sockopt_set(sopt, &otv, sizeof(otv));
1949: break;
1950: }
1951: #endif /* COMPAT_50 */
1952:
1.171 plunky 1953: case SO_SNDTIMEO:
1954: case SO_RCVTIMEO:
1.179 christos 1955: optval = (opt == SO_SNDTIMEO ?
1.171 plunky 1956: so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
1957:
1958: tv.tv_sec = optval / hz;
1959: tv.tv_usec = (optval % hz) * tick;
1960:
1961: error = sockopt_set(sopt, &tv, sizeof(tv));
1962: break;
1963:
1964: case SO_OVERFLOWED:
1965: error = sockopt_setint(sopt, so->so_rcv.sb_overflowed);
1966: break;
1967:
1968: default:
1969: error = ENOPROTOOPT;
1970: break;
1971: }
1972:
1973: return (error);
1974: }
1975:
1.14 mycroft 1976: int
1.171 plunky 1977: sogetopt(struct socket *so, struct sockopt *sopt)
1.1 cgd 1978: {
1.160 ad 1979: int error;
1.1 cgd 1980:
1.160 ad 1981: solock(so);
1.171 plunky 1982: if (sopt->sopt_level != SOL_SOCKET) {
1.1 cgd 1983: if (so->so_proto && so->so_proto->pr_ctloutput) {
1.160 ad 1984: error = ((*so->so_proto->pr_ctloutput)
1.171 plunky 1985: (PRCO_GETOPT, so, sopt));
1.1 cgd 1986: } else
1.160 ad 1987: error = (ENOPROTOOPT);
1.1 cgd 1988: } else {
1.171 plunky 1989: error = sogetopt1(so, sopt);
1990: }
1991: sounlock(so);
1992: return (error);
1993: }
1994:
1995: /*
1996: * alloc sockopt data buffer buffer
1997: * - will be released at destroy
1998: */
1.176 plunky 1999: static int
2000: sockopt_alloc(struct sockopt *sopt, size_t len, km_flag_t kmflag)
1.171 plunky 2001: {
2002:
2003: KASSERT(sopt->sopt_size == 0);
2004:
1.176 plunky 2005: if (len > sizeof(sopt->sopt_buf)) {
2006: sopt->sopt_data = kmem_zalloc(len, kmflag);
2007: if (sopt->sopt_data == NULL)
2008: return ENOMEM;
2009: } else
1.171 plunky 2010: sopt->sopt_data = sopt->sopt_buf;
2011:
2012: sopt->sopt_size = len;
1.176 plunky 2013: return 0;
1.171 plunky 2014: }
2015:
2016: /*
2017: * initialise sockopt storage
1.176 plunky 2018: * - MAY sleep during allocation
1.171 plunky 2019: */
2020: void
2021: sockopt_init(struct sockopt *sopt, int level, int name, size_t size)
2022: {
1.1 cgd 2023:
1.171 plunky 2024: memset(sopt, 0, sizeof(*sopt));
1.1 cgd 2025:
1.171 plunky 2026: sopt->sopt_level = level;
2027: sopt->sopt_name = name;
1.176 plunky 2028: (void)sockopt_alloc(sopt, size, KM_SLEEP);
1.171 plunky 2029: }
2030:
2031: /*
2032: * destroy sockopt storage
2033: * - will release any held memory references
2034: */
2035: void
2036: sockopt_destroy(struct sockopt *sopt)
2037: {
2038:
2039: if (sopt->sopt_data != sopt->sopt_buf)
1.173 plunky 2040: kmem_free(sopt->sopt_data, sopt->sopt_size);
1.171 plunky 2041:
2042: memset(sopt, 0, sizeof(*sopt));
2043: }
2044:
2045: /*
2046: * set sockopt value
2047: * - value is copied into sockopt
1.176 plunky 2048: * - memory is allocated when necessary, will not sleep
1.171 plunky 2049: */
2050: int
2051: sockopt_set(struct sockopt *sopt, const void *buf, size_t len)
2052: {
1.176 plunky 2053: int error;
1.171 plunky 2054:
1.176 plunky 2055: if (sopt->sopt_size == 0) {
2056: error = sockopt_alloc(sopt, len, KM_NOSLEEP);
2057: if (error)
2058: return error;
2059: }
1.171 plunky 2060:
2061: KASSERT(sopt->sopt_size == len);
2062: memcpy(sopt->sopt_data, buf, len);
2063: return 0;
2064: }
2065:
2066: /*
2067: * common case of set sockopt integer value
2068: */
2069: int
2070: sockopt_setint(struct sockopt *sopt, int val)
2071: {
2072:
2073: return sockopt_set(sopt, &val, sizeof(int));
2074: }
2075:
2076: /*
2077: * get sockopt value
2078: * - correct size must be given
2079: */
2080: int
2081: sockopt_get(const struct sockopt *sopt, void *buf, size_t len)
2082: {
1.170 tls 2083:
1.171 plunky 2084: if (sopt->sopt_size != len)
2085: return EINVAL;
1.1 cgd 2086:
1.171 plunky 2087: memcpy(buf, sopt->sopt_data, len);
2088: return 0;
2089: }
1.1 cgd 2090:
1.171 plunky 2091: /*
2092: * common case of get sockopt integer value
2093: */
2094: int
2095: sockopt_getint(const struct sockopt *sopt, int *valp)
2096: {
1.1 cgd 2097:
1.171 plunky 2098: return sockopt_get(sopt, valp, sizeof(int));
2099: }
1.1 cgd 2100:
1.171 plunky 2101: /*
2102: * set sockopt value from mbuf
2103: * - ONLY for legacy code
2104: * - mbuf is released by sockopt
1.176 plunky 2105: * - will not sleep
1.171 plunky 2106: */
2107: int
2108: sockopt_setmbuf(struct sockopt *sopt, struct mbuf *m)
2109: {
2110: size_t len;
1.176 plunky 2111: int error;
1.1 cgd 2112:
1.171 plunky 2113: len = m_length(m);
1.1 cgd 2114:
1.176 plunky 2115: if (sopt->sopt_size == 0) {
2116: error = sockopt_alloc(sopt, len, KM_NOSLEEP);
2117: if (error)
2118: return error;
2119: }
1.1 cgd 2120:
1.171 plunky 2121: KASSERT(sopt->sopt_size == len);
2122: m_copydata(m, 0, len, sopt->sopt_data);
2123: m_freem(m);
1.1 cgd 2124:
1.171 plunky 2125: return 0;
2126: }
1.1 cgd 2127:
1.171 plunky 2128: /*
2129: * get sockopt value into mbuf
2130: * - ONLY for legacy code
2131: * - mbuf to be released by the caller
1.176 plunky 2132: * - will not sleep
1.171 plunky 2133: */
2134: struct mbuf *
2135: sockopt_getmbuf(const struct sockopt *sopt)
2136: {
2137: struct mbuf *m;
1.107 darrenr 2138:
1.176 plunky 2139: if (sopt->sopt_size > MCLBYTES)
2140: return NULL;
2141:
2142: m = m_get(M_DONTWAIT, MT_SOOPTS);
1.171 plunky 2143: if (m == NULL)
2144: return NULL;
2145:
1.176 plunky 2146: if (sopt->sopt_size > MLEN) {
2147: MCLGET(m, M_DONTWAIT);
2148: if ((m->m_flags & M_EXT) == 0) {
2149: m_free(m);
2150: return NULL;
2151: }
1.1 cgd 2152: }
1.176 plunky 2153:
2154: memcpy(mtod(m, void *), sopt->sopt_data, sopt->sopt_size);
2155: m->m_len = sopt->sopt_size;
1.160 ad 2156:
1.171 plunky 2157: return m;
1.1 cgd 2158: }
2159:
1.14 mycroft 2160: void
1.54 lukem 2161: sohasoutofband(struct socket *so)
1.1 cgd 2162: {
1.153 rmind 2163:
1.90 christos 2164: fownsignal(so->so_pgid, SIGURG, POLL_PRI, POLLPRI|POLLRDBAND, so);
1.189 ad 2165: selnotify(&so->so_rcv.sb_sel, POLLPRI | POLLRDBAND, NOTE_SUBMIT);
1.1 cgd 2166: }
1.72 jdolecek 2167:
2168: static void
2169: filt_sordetach(struct knote *kn)
2170: {
2171: struct socket *so;
2172:
1.155 ad 2173: so = ((file_t *)kn->kn_obj)->f_data;
1.160 ad 2174: solock(so);
1.73 christos 2175: SLIST_REMOVE(&so->so_rcv.sb_sel.sel_klist, kn, knote, kn_selnext);
2176: if (SLIST_EMPTY(&so->so_rcv.sb_sel.sel_klist))
1.72 jdolecek 2177: so->so_rcv.sb_flags &= ~SB_KNOTE;
1.160 ad 2178: sounlock(so);
1.72 jdolecek 2179: }
2180:
2181: /*ARGSUSED*/
2182: static int
1.129 yamt 2183: filt_soread(struct knote *kn, long hint)
1.72 jdolecek 2184: {
2185: struct socket *so;
1.160 ad 2186: int rv;
1.72 jdolecek 2187:
1.155 ad 2188: so = ((file_t *)kn->kn_obj)->f_data;
1.160 ad 2189: if (hint != NOTE_SUBMIT)
2190: solock(so);
1.72 jdolecek 2191: kn->kn_data = so->so_rcv.sb_cc;
2192: if (so->so_state & SS_CANTRCVMORE) {
1.108 perry 2193: kn->kn_flags |= EV_EOF;
1.72 jdolecek 2194: kn->kn_fflags = so->so_error;
1.160 ad 2195: rv = 1;
2196: } else if (so->so_error) /* temporary udp error */
2197: rv = 1;
2198: else if (kn->kn_sfflags & NOTE_LOWAT)
2199: rv = (kn->kn_data >= kn->kn_sdata);
2200: else
2201: rv = (kn->kn_data >= so->so_rcv.sb_lowat);
2202: if (hint != NOTE_SUBMIT)
2203: sounlock(so);
2204: return rv;
1.72 jdolecek 2205: }
2206:
2207: static void
2208: filt_sowdetach(struct knote *kn)
2209: {
2210: struct socket *so;
2211:
1.155 ad 2212: so = ((file_t *)kn->kn_obj)->f_data;
1.160 ad 2213: solock(so);
1.73 christos 2214: SLIST_REMOVE(&so->so_snd.sb_sel.sel_klist, kn, knote, kn_selnext);
2215: if (SLIST_EMPTY(&so->so_snd.sb_sel.sel_klist))
1.72 jdolecek 2216: so->so_snd.sb_flags &= ~SB_KNOTE;
1.160 ad 2217: sounlock(so);
1.72 jdolecek 2218: }
2219:
2220: /*ARGSUSED*/
2221: static int
1.129 yamt 2222: filt_sowrite(struct knote *kn, long hint)
1.72 jdolecek 2223: {
2224: struct socket *so;
1.160 ad 2225: int rv;
1.72 jdolecek 2226:
1.155 ad 2227: so = ((file_t *)kn->kn_obj)->f_data;
1.160 ad 2228: if (hint != NOTE_SUBMIT)
2229: solock(so);
1.72 jdolecek 2230: kn->kn_data = sbspace(&so->so_snd);
2231: if (so->so_state & SS_CANTSENDMORE) {
1.108 perry 2232: kn->kn_flags |= EV_EOF;
1.72 jdolecek 2233: kn->kn_fflags = so->so_error;
1.160 ad 2234: rv = 1;
2235: } else if (so->so_error) /* temporary udp error */
2236: rv = 1;
2237: else if (((so->so_state & SS_ISCONNECTED) == 0) &&
1.72 jdolecek 2238: (so->so_proto->pr_flags & PR_CONNREQUIRED))
1.160 ad 2239: rv = 0;
2240: else if (kn->kn_sfflags & NOTE_LOWAT)
2241: rv = (kn->kn_data >= kn->kn_sdata);
2242: else
2243: rv = (kn->kn_data >= so->so_snd.sb_lowat);
2244: if (hint != NOTE_SUBMIT)
2245: sounlock(so);
2246: return rv;
1.72 jdolecek 2247: }
2248:
2249: /*ARGSUSED*/
2250: static int
1.129 yamt 2251: filt_solisten(struct knote *kn, long hint)
1.72 jdolecek 2252: {
2253: struct socket *so;
1.160 ad 2254: int rv;
1.72 jdolecek 2255:
1.155 ad 2256: so = ((file_t *)kn->kn_obj)->f_data;
1.72 jdolecek 2257:
2258: /*
2259: * Set kn_data to number of incoming connections, not
2260: * counting partial (incomplete) connections.
1.108 perry 2261: */
1.160 ad 2262: if (hint != NOTE_SUBMIT)
2263: solock(so);
1.72 jdolecek 2264: kn->kn_data = so->so_qlen;
1.160 ad 2265: rv = (kn->kn_data > 0);
2266: if (hint != NOTE_SUBMIT)
2267: sounlock(so);
2268: return rv;
1.72 jdolecek 2269: }
2270:
2271: static const struct filterops solisten_filtops =
2272: { 1, NULL, filt_sordetach, filt_solisten };
2273: static const struct filterops soread_filtops =
2274: { 1, NULL, filt_sordetach, filt_soread };
2275: static const struct filterops sowrite_filtops =
2276: { 1, NULL, filt_sowdetach, filt_sowrite };
2277:
2278: int
1.129 yamt 2279: soo_kqfilter(struct file *fp, struct knote *kn)
1.72 jdolecek 2280: {
2281: struct socket *so;
2282: struct sockbuf *sb;
2283:
1.155 ad 2284: so = ((file_t *)kn->kn_obj)->f_data;
1.160 ad 2285: solock(so);
1.72 jdolecek 2286: switch (kn->kn_filter) {
2287: case EVFILT_READ:
2288: if (so->so_options & SO_ACCEPTCONN)
2289: kn->kn_fop = &solisten_filtops;
2290: else
2291: kn->kn_fop = &soread_filtops;
2292: sb = &so->so_rcv;
2293: break;
2294: case EVFILT_WRITE:
2295: kn->kn_fop = &sowrite_filtops;
2296: sb = &so->so_snd;
2297: break;
2298: default:
1.160 ad 2299: sounlock(so);
1.149 pooka 2300: return (EINVAL);
1.72 jdolecek 2301: }
1.73 christos 2302: SLIST_INSERT_HEAD(&sb->sb_sel.sel_klist, kn, kn_selnext);
1.72 jdolecek 2303: sb->sb_flags |= SB_KNOTE;
1.160 ad 2304: sounlock(so);
1.72 jdolecek 2305: return (0);
2306: }
2307:
1.154 ad 2308: static int
2309: sodopoll(struct socket *so, int events)
2310: {
2311: int revents;
2312:
2313: revents = 0;
2314:
2315: if (events & (POLLIN | POLLRDNORM))
2316: if (soreadable(so))
2317: revents |= events & (POLLIN | POLLRDNORM);
2318:
2319: if (events & (POLLOUT | POLLWRNORM))
2320: if (sowritable(so))
2321: revents |= events & (POLLOUT | POLLWRNORM);
2322:
2323: if (events & (POLLPRI | POLLRDBAND))
2324: if (so->so_oobmark || (so->so_state & SS_RCVATMARK))
2325: revents |= events & (POLLPRI | POLLRDBAND);
2326:
2327: return revents;
2328: }
2329:
2330: int
2331: sopoll(struct socket *so, int events)
2332: {
2333: int revents = 0;
2334:
1.160 ad 2335: #ifndef DIAGNOSTIC
2336: /*
2337: * Do a quick, unlocked check in expectation that the socket
2338: * will be ready for I/O. Don't do this check if DIAGNOSTIC,
2339: * as the solocked() assertions will fail.
2340: */
1.154 ad 2341: if ((revents = sodopoll(so, events)) != 0)
2342: return revents;
1.160 ad 2343: #endif
1.154 ad 2344:
1.160 ad 2345: solock(so);
1.154 ad 2346: if ((revents = sodopoll(so, events)) == 0) {
2347: if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
2348: selrecord(curlwp, &so->so_rcv.sb_sel);
1.160 ad 2349: so->so_rcv.sb_flags |= SB_NOTIFY;
1.154 ad 2350: }
2351:
2352: if (events & (POLLOUT | POLLWRNORM)) {
2353: selrecord(curlwp, &so->so_snd.sb_sel);
1.160 ad 2354: so->so_snd.sb_flags |= SB_NOTIFY;
1.154 ad 2355: }
2356: }
1.160 ad 2357: sounlock(so);
1.154 ad 2358:
2359: return revents;
2360: }
2361:
2362:
1.94 yamt 2363: #include <sys/sysctl.h>
2364:
2365: static int sysctl_kern_somaxkva(SYSCTLFN_PROTO);
1.212 pooka 2366: static int sysctl_kern_sbmax(SYSCTLFN_PROTO);
1.94 yamt 2367:
2368: /*
2369: * sysctl helper routine for kern.somaxkva. ensures that the given
2370: * value is not too small.
2371: * (XXX should we maybe make sure it's not too large as well?)
2372: */
2373: static int
2374: sysctl_kern_somaxkva(SYSCTLFN_ARGS)
2375: {
2376: int error, new_somaxkva;
2377: struct sysctlnode node;
2378:
2379: new_somaxkva = somaxkva;
2380: node = *rnode;
2381: node.sysctl_data = &new_somaxkva;
2382: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2383: if (error || newp == NULL)
2384: return (error);
2385:
2386: if (new_somaxkva < (16 * 1024 * 1024)) /* sanity */
2387: return (EINVAL);
2388:
1.136 ad 2389: mutex_enter(&so_pendfree_lock);
1.94 yamt 2390: somaxkva = new_somaxkva;
1.136 ad 2391: cv_broadcast(&socurkva_cv);
2392: mutex_exit(&so_pendfree_lock);
1.94 yamt 2393:
2394: return (error);
2395: }
2396:
1.212 pooka 2397: /*
2398: * sysctl helper routine for kern.sbmax. Basically just ensures that
2399: * any new value is not too small.
2400: */
2401: static int
2402: sysctl_kern_sbmax(SYSCTLFN_ARGS)
2403: {
2404: int error, new_sbmax;
2405: struct sysctlnode node;
2406:
2407: new_sbmax = sb_max;
2408: node = *rnode;
2409: node.sysctl_data = &new_sbmax;
2410: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2411: if (error || newp == NULL)
2412: return (error);
2413:
2414: KERNEL_LOCK(1, NULL);
2415: error = sb_max_set(new_sbmax);
2416: KERNEL_UNLOCK_ONE(NULL);
2417:
2418: return (error);
2419: }
2420:
1.178 pooka 2421: static void
1.212 pooka 2422: sysctl_kern_socket_setup(void)
1.94 yamt 2423: {
2424:
1.178 pooka 2425: KASSERT(socket_sysctllog == NULL);
2426: sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
1.97 atatat 2427: CTLFLAG_PERMANENT,
2428: CTLTYPE_NODE, "kern", NULL,
2429: NULL, 0, NULL, 0,
2430: CTL_KERN, CTL_EOL);
2431:
1.178 pooka 2432: sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
1.97 atatat 2433: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.103 atatat 2434: CTLTYPE_INT, "somaxkva",
2435: SYSCTL_DESCR("Maximum amount of kernel memory to be "
2436: "used for socket buffers"),
1.94 yamt 2437: sysctl_kern_somaxkva, 0, NULL, 0,
2438: CTL_KERN, KERN_SOMAXKVA, CTL_EOL);
1.212 pooka 2439:
2440: sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
2441: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2442: CTLTYPE_INT, "sbmax",
2443: SYSCTL_DESCR("Maximum socket buffer size"),
2444: sysctl_kern_sbmax, 0, NULL, 0,
2445: CTL_KERN, KERN_SBMAX, CTL_EOL);
1.94 yamt 2446: }
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