Annotation of src/sys/kern/uipc_socket.c, Revision 1.205.2.1
1.205.2.1! yamt 1: /* $NetBSD$ */
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>
1.205.2.1! yamt 66: __KERNEL_RCSID(0, "$NetBSD$");
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
1.205.2.1! yamt 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:
1.205.2.1! yamt 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:
1.205.2.1! yamt 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:
1.199 elad 419: if (proc_uidmatch(cred, so->so_cred))
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);
1.205.2.1! yamt 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;
588: }
589: return error;
590: }
591:
1.3 andrew 592: int
1.190 dyoung 593: sofamily(const struct socket *so)
594: {
595: const struct protosw *pr;
596: const struct domain *dom;
597:
598: if ((pr = so->so_proto) == NULL)
599: return AF_UNSPEC;
600: if ((dom = pr->pr_domain) == NULL)
601: return AF_UNSPEC;
602: return dom->dom_family;
603: }
604:
605: int
1.114 christos 606: sobind(struct socket *so, struct mbuf *nam, struct lwp *l)
1.1 cgd 607: {
1.160 ad 608: int error;
1.1 cgd 609:
1.160 ad 610: solock(so);
1.140 dyoung 611: error = (*so->so_proto->pr_usrreq)(so, PRU_BIND, NULL, nam, NULL, l);
1.160 ad 612: sounlock(so);
1.140 dyoung 613: return error;
1.1 cgd 614: }
615:
1.3 andrew 616: int
1.150 elad 617: solisten(struct socket *so, int backlog, struct lwp *l)
1.1 cgd 618: {
1.160 ad 619: int error;
1.1 cgd 620:
1.160 ad 621: solock(so);
1.158 ad 622: if ((so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING |
1.163 ad 623: SS_ISDISCONNECTING)) != 0) {
624: sounlock(so);
1.205.2.1! yamt 625: return (EINVAL);
1.163 ad 626: }
1.140 dyoung 627: error = (*so->so_proto->pr_usrreq)(so, PRU_LISTEN, NULL,
1.150 elad 628: NULL, NULL, l);
1.140 dyoung 629: if (error != 0) {
1.160 ad 630: sounlock(so);
1.140 dyoung 631: return error;
1.1 cgd 632: }
1.63 matt 633: if (TAILQ_EMPTY(&so->so_q))
1.1 cgd 634: so->so_options |= SO_ACCEPTCONN;
635: if (backlog < 0)
636: backlog = 0;
1.49 jonathan 637: so->so_qlimit = min(backlog, somaxconn);
1.160 ad 638: sounlock(so);
1.140 dyoung 639: return 0;
1.1 cgd 640: }
641:
1.21 christos 642: void
1.54 lukem 643: sofree(struct socket *so)
1.1 cgd 644: {
1.161 ad 645: u_int refs;
1.1 cgd 646:
1.160 ad 647: KASSERT(solocked(so));
648:
649: if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0) {
650: sounlock(so);
1.1 cgd 651: return;
1.160 ad 652: }
1.43 mycroft 653: if (so->so_head) {
654: /*
655: * We must not decommission a socket that's on the accept(2)
656: * queue. If we do, then accept(2) may hang after select(2)
657: * indicated that the listening socket was ready.
658: */
1.160 ad 659: if (!soqremque(so, 0)) {
660: sounlock(so);
1.43 mycroft 661: return;
1.160 ad 662: }
1.43 mycroft 663: }
1.98 christos 664: if (so->so_rcv.sb_hiwat)
1.110 christos 665: (void)chgsbsize(so->so_uidinfo, &so->so_rcv.sb_hiwat, 0,
1.98 christos 666: RLIM_INFINITY);
667: if (so->so_snd.sb_hiwat)
1.110 christos 668: (void)chgsbsize(so->so_uidinfo, &so->so_snd.sb_hiwat, 0,
1.98 christos 669: RLIM_INFINITY);
670: sbrelease(&so->so_snd, so);
1.160 ad 671: KASSERT(!cv_has_waiters(&so->so_cv));
672: KASSERT(!cv_has_waiters(&so->so_rcv.sb_cv));
673: KASSERT(!cv_has_waiters(&so->so_snd.sb_cv));
1.1 cgd 674: sorflush(so);
1.161 ad 675: refs = so->so_aborting; /* XXX */
1.177 ad 676: /* Remove acccept filter if one is present. */
1.170 tls 677: if (so->so_accf != NULL)
1.177 ad 678: (void)accept_filt_clear(so);
1.160 ad 679: sounlock(so);
1.161 ad 680: if (refs == 0) /* XXX */
681: soput(so);
1.1 cgd 682: }
683:
684: /*
685: * Close a socket on last file table reference removal.
686: * Initiate disconnect if connected.
687: * Free socket when disconnect complete.
688: */
1.3 andrew 689: int
1.54 lukem 690: soclose(struct socket *so)
1.1 cgd 691: {
1.54 lukem 692: struct socket *so2;
1.160 ad 693: int error;
694: int error2;
1.1 cgd 695:
1.54 lukem 696: error = 0;
1.160 ad 697: solock(so);
1.1 cgd 698: if (so->so_options & SO_ACCEPTCONN) {
1.172 ad 699: for (;;) {
700: if ((so2 = TAILQ_FIRST(&so->so_q0)) != 0) {
1.160 ad 701: KASSERT(solocked2(so, so2));
702: (void) soqremque(so2, 0);
703: /* soabort drops the lock. */
704: (void) soabort(so2);
705: solock(so);
1.172 ad 706: continue;
1.160 ad 707: }
1.172 ad 708: if ((so2 = TAILQ_FIRST(&so->so_q)) != 0) {
1.160 ad 709: KASSERT(solocked2(so, so2));
710: (void) soqremque(so2, 1);
711: /* soabort drops the lock. */
712: (void) soabort(so2);
713: solock(so);
1.172 ad 714: continue;
1.160 ad 715: }
1.172 ad 716: break;
717: }
1.1 cgd 718: }
719: if (so->so_pcb == 0)
720: goto discard;
721: if (so->so_state & SS_ISCONNECTED) {
722: if ((so->so_state & SS_ISDISCONNECTING) == 0) {
723: error = sodisconnect(so);
724: if (error)
725: goto drop;
726: }
727: if (so->so_options & SO_LINGER) {
1.205.2.1! yamt 728: if ((so->so_state & (SS_ISDISCONNECTING|SS_NBIO)) ==
! 729: (SS_ISDISCONNECTING|SS_NBIO))
1.1 cgd 730: goto drop;
1.21 christos 731: while (so->so_state & SS_ISCONNECTED) {
1.185 yamt 732: error = sowait(so, true, so->so_linger * hz);
1.21 christos 733: if (error)
1.1 cgd 734: break;
1.21 christos 735: }
1.1 cgd 736: }
737: }
1.54 lukem 738: drop:
1.1 cgd 739: if (so->so_pcb) {
1.160 ad 740: error2 = (*so->so_proto->pr_usrreq)(so, PRU_DETACH,
1.140 dyoung 741: NULL, NULL, NULL, NULL);
1.1 cgd 742: if (error == 0)
743: error = error2;
744: }
1.54 lukem 745: discard:
1.1 cgd 746: if (so->so_state & SS_NOFDREF)
747: panic("soclose: NOFDREF");
1.198 elad 748: kauth_cred_free(so->so_cred);
1.1 cgd 749: so->so_state |= SS_NOFDREF;
750: sofree(so);
751: return (error);
752: }
753:
754: /*
1.160 ad 755: * Must be called with the socket locked.. Will return with it unlocked.
1.1 cgd 756: */
1.3 andrew 757: int
1.54 lukem 758: soabort(struct socket *so)
1.1 cgd 759: {
1.161 ad 760: u_int refs;
1.139 yamt 761: int error;
1.160 ad 762:
763: KASSERT(solocked(so));
764: KASSERT(so->so_head == NULL);
1.1 cgd 765:
1.161 ad 766: so->so_aborting++; /* XXX */
1.140 dyoung 767: error = (*so->so_proto->pr_usrreq)(so, PRU_ABORT, NULL,
768: NULL, NULL, NULL);
1.161 ad 769: refs = --so->so_aborting; /* XXX */
1.164 drochner 770: if (error || (refs == 0)) {
1.139 yamt 771: sofree(so);
1.160 ad 772: } else {
773: sounlock(so);
1.139 yamt 774: }
775: return error;
1.1 cgd 776: }
777:
1.3 andrew 778: int
1.54 lukem 779: soaccept(struct socket *so, struct mbuf *nam)
1.1 cgd 780: {
1.160 ad 781: int error;
782:
783: KASSERT(solocked(so));
1.1 cgd 784:
1.54 lukem 785: error = 0;
1.1 cgd 786: if ((so->so_state & SS_NOFDREF) == 0)
787: panic("soaccept: !NOFDREF");
788: so->so_state &= ~SS_NOFDREF;
1.55 thorpej 789: if ((so->so_state & SS_ISDISCONNECTED) == 0 ||
790: (so->so_proto->pr_flags & PR_ABRTACPTDIS) == 0)
1.41 mycroft 791: error = (*so->so_proto->pr_usrreq)(so, PRU_ACCEPT,
1.140 dyoung 792: NULL, nam, NULL, NULL);
1.41 mycroft 793: else
1.53 itojun 794: error = ECONNABORTED;
1.52 itojun 795:
1.1 cgd 796: return (error);
797: }
798:
1.3 andrew 799: int
1.114 christos 800: soconnect(struct socket *so, struct mbuf *nam, struct lwp *l)
1.1 cgd 801: {
1.160 ad 802: int error;
803:
804: KASSERT(solocked(so));
1.1 cgd 805:
806: if (so->so_options & SO_ACCEPTCONN)
807: return (EOPNOTSUPP);
808: /*
809: * If protocol is connection-based, can only connect once.
810: * Otherwise, if connected, try to disconnect first.
811: * This allows user to disconnect by connecting to, e.g.,
812: * a null address.
813: */
814: if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
815: ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
816: (error = sodisconnect(so))))
817: error = EISCONN;
818: else
819: error = (*so->so_proto->pr_usrreq)(so, PRU_CONNECT,
1.140 dyoung 820: NULL, nam, NULL, l);
1.1 cgd 821: return (error);
822: }
823:
1.3 andrew 824: int
1.54 lukem 825: soconnect2(struct socket *so1, struct socket *so2)
1.1 cgd 826: {
1.160 ad 827: int error;
828:
829: KASSERT(solocked2(so1, so2));
1.1 cgd 830:
1.22 mycroft 831: error = (*so1->so_proto->pr_usrreq)(so1, PRU_CONNECT2,
1.140 dyoung 832: NULL, (struct mbuf *)so2, NULL, NULL);
1.1 cgd 833: return (error);
834: }
835:
1.3 andrew 836: int
1.54 lukem 837: sodisconnect(struct socket *so)
1.1 cgd 838: {
1.160 ad 839: int error;
840:
841: KASSERT(solocked(so));
1.1 cgd 842:
843: if ((so->so_state & SS_ISCONNECTED) == 0) {
844: error = ENOTCONN;
1.160 ad 845: } else if (so->so_state & SS_ISDISCONNECTING) {
1.1 cgd 846: error = EALREADY;
1.160 ad 847: } else {
848: error = (*so->so_proto->pr_usrreq)(so, PRU_DISCONNECT,
849: NULL, NULL, NULL, NULL);
1.1 cgd 850: }
851: return (error);
852: }
853:
1.15 mycroft 854: #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK)
1.1 cgd 855: /*
856: * Send on a socket.
857: * If send must go all at once and message is larger than
858: * send buffering, then hard error.
859: * Lock against other senders.
860: * If must go all at once and not enough room now, then
861: * inform user that this would block and do nothing.
862: * Otherwise, if nonblocking, send as much as possible.
863: * The data to be sent is described by "uio" if nonzero,
864: * otherwise by the mbuf chain "top" (which must be null
865: * if uio is not). Data provided in mbuf chain must be small
866: * enough to send all at once.
867: *
868: * Returns nonzero on error, timeout or signal; callers
869: * must check for short counts if EINTR/ERESTART are returned.
870: * Data and control buffers are freed on return.
871: */
1.3 andrew 872: int
1.54 lukem 873: sosend(struct socket *so, struct mbuf *addr, struct uio *uio, struct mbuf *top,
1.114 christos 874: struct mbuf *control, int flags, struct lwp *l)
1.1 cgd 875: {
1.54 lukem 876: struct mbuf **mp, *m;
1.114 christos 877: struct proc *p;
1.58 jdolecek 878: long space, len, resid, clen, mlen;
879: int error, s, dontroute, atomic;
1.196 dsl 880: short wakeup_state = 0;
1.54 lukem 881:
1.114 christos 882: p = l->l_proc;
1.160 ad 883: clen = 0;
1.64 thorpej 884:
1.160 ad 885: /*
886: * solock() provides atomicity of access. splsoftnet() prevents
887: * protocol processing soft interrupts from interrupting us and
888: * blocking (expensive).
889: */
890: s = splsoftnet();
891: solock(so);
1.54 lukem 892: atomic = sosendallatonce(so) || top;
1.1 cgd 893: if (uio)
894: resid = uio->uio_resid;
895: else
896: resid = top->m_pkthdr.len;
1.7 cgd 897: /*
898: * In theory resid should be unsigned.
899: * However, space must be signed, as it might be less than 0
900: * if we over-committed, and we must use a signed comparison
901: * of space and resid. On the other hand, a negative resid
902: * causes us to loop sending 0-length segments to the protocol.
903: */
1.29 mycroft 904: if (resid < 0) {
905: error = EINVAL;
906: goto out;
907: }
1.1 cgd 908: dontroute =
909: (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
910: (so->so_proto->pr_flags & PR_ATOMIC);
1.165 christos 911: l->l_ru.ru_msgsnd++;
1.1 cgd 912: if (control)
913: clen = control->m_len;
1.54 lukem 914: restart:
1.21 christos 915: if ((error = sblock(&so->so_snd, SBLOCKWAIT(flags))) != 0)
1.1 cgd 916: goto out;
917: do {
1.160 ad 918: if (so->so_state & SS_CANTSENDMORE) {
919: error = EPIPE;
920: goto release;
921: }
1.48 thorpej 922: if (so->so_error) {
923: error = so->so_error;
924: so->so_error = 0;
925: goto release;
926: }
1.1 cgd 927: if ((so->so_state & SS_ISCONNECTED) == 0) {
928: if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
929: if ((so->so_state & SS_ISCONFIRMING) == 0 &&
1.160 ad 930: !(resid == 0 && clen != 0)) {
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)) {
1.205.2.1! yamt 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;
1.146 dyoung 1135: int atomic, flags, len, error, s, offset, moff, type, orig_resid;
1.99 matt 1136: const struct protosw *pr;
1.54 lukem 1137: struct mbuf *nextrecord;
1.67 he 1138: int mbuf_removed = 0;
1.146 dyoung 1139: const struct domain *dom;
1.196 dsl 1140: short wakeup_state = 0;
1.64 thorpej 1141:
1.54 lukem 1142: pr = so->so_proto;
1.146 dyoung 1143: atomic = pr->pr_flags & PR_ATOMIC;
1144: dom = pr->pr_domain;
1.1 cgd 1145: mp = mp0;
1.54 lukem 1146: type = 0;
1147: orig_resid = uio->uio_resid;
1.102 jonathan 1148:
1.144 dyoung 1149: if (paddr != NULL)
1150: *paddr = NULL;
1151: if (controlp != NULL)
1152: *controlp = NULL;
1153: if (flagsp != NULL)
1.1 cgd 1154: flags = *flagsp &~ MSG_EOR;
1155: else
1156: flags = 0;
1.66 enami 1157:
1.1 cgd 1158: if (flags & MSG_OOB) {
1159: m = m_get(M_WAIT, MT_DATA);
1.160 ad 1160: solock(so);
1.17 cgd 1161: error = (*pr->pr_usrreq)(so, PRU_RCVOOB, m,
1.140 dyoung 1162: (struct mbuf *)(long)(flags & MSG_PEEK), NULL, l);
1.160 ad 1163: sounlock(so);
1.1 cgd 1164: if (error)
1165: goto bad;
1166: do {
1.134 christos 1167: error = uiomove(mtod(m, void *),
1.1 cgd 1168: (int) min(uio->uio_resid, m->m_len), uio);
1169: m = m_free(m);
1.144 dyoung 1170: } while (uio->uio_resid > 0 && error == 0 && m);
1.54 lukem 1171: bad:
1.144 dyoung 1172: if (m != NULL)
1.1 cgd 1173: m_freem(m);
1.144 dyoung 1174: return error;
1.1 cgd 1175: }
1.144 dyoung 1176: if (mp != NULL)
1.140 dyoung 1177: *mp = NULL;
1.160 ad 1178:
1179: /*
1180: * solock() provides atomicity of access. splsoftnet() prevents
1181: * protocol processing soft interrupts from interrupting us and
1182: * blocking (expensive).
1183: */
1184: s = splsoftnet();
1185: solock(so);
1.1 cgd 1186: if (so->so_state & SS_ISCONFIRMING && uio->uio_resid)
1.140 dyoung 1187: (*pr->pr_usrreq)(so, PRU_RCVD, NULL, NULL, NULL, l);
1.1 cgd 1188:
1.54 lukem 1189: restart:
1.160 ad 1190: if ((error = sblock(&so->so_rcv, SBLOCKWAIT(flags))) != 0) {
1191: sounlock(so);
1192: splx(s);
1.144 dyoung 1193: return error;
1.160 ad 1194: }
1.1 cgd 1195:
1196: m = so->so_rcv.sb_mb;
1197: /*
1198: * If we have less data than requested, block awaiting more
1199: * (subject to any timeout) if:
1.15 mycroft 1200: * 1. the current count is less than the low water mark,
1.1 cgd 1201: * 2. MSG_WAITALL is set, and it is possible to do the entire
1.15 mycroft 1202: * receive operation at once if we block (resid <= hiwat), or
1203: * 3. MSG_DONTWAIT is not set.
1.1 cgd 1204: * If MSG_WAITALL is set but resid is larger than the receive buffer,
1205: * we have to do the receive in sections, and thus risk returning
1206: * a short count if a timeout or signal occurs after we start.
1207: */
1.144 dyoung 1208: if (m == NULL ||
1209: ((flags & MSG_DONTWAIT) == 0 &&
1210: so->so_rcv.sb_cc < uio->uio_resid &&
1211: (so->so_rcv.sb_cc < so->so_rcv.sb_lowat ||
1212: ((flags & MSG_WAITALL) &&
1213: uio->uio_resid <= so->so_rcv.sb_hiwat)) &&
1.146 dyoung 1214: m->m_nextpkt == NULL && !atomic)) {
1.1 cgd 1215: #ifdef DIAGNOSTIC
1.144 dyoung 1216: if (m == NULL && so->so_rcv.sb_cc)
1.1 cgd 1217: panic("receive 1");
1218: #endif
1219: if (so->so_error) {
1.144 dyoung 1220: if (m != NULL)
1.15 mycroft 1221: goto dontblock;
1.1 cgd 1222: error = so->so_error;
1223: if ((flags & MSG_PEEK) == 0)
1224: so->so_error = 0;
1225: goto release;
1226: }
1227: if (so->so_state & SS_CANTRCVMORE) {
1.144 dyoung 1228: if (m != NULL)
1.15 mycroft 1229: goto dontblock;
1.1 cgd 1230: else
1231: goto release;
1232: }
1.144 dyoung 1233: for (; m != NULL; m = m->m_next)
1.1 cgd 1234: if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) {
1235: m = so->so_rcv.sb_mb;
1236: goto dontblock;
1237: }
1238: if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
1239: (so->so_proto->pr_flags & PR_CONNREQUIRED)) {
1240: error = ENOTCONN;
1241: goto release;
1242: }
1243: if (uio->uio_resid == 0)
1244: goto release;
1.205.2.1! yamt 1245: if ((so->so_state & SS_NBIO) ||
! 1246: (flags & (MSG_DONTWAIT|MSG_NBIO))) {
1.1 cgd 1247: error = EWOULDBLOCK;
1248: goto release;
1249: }
1.69 thorpej 1250: SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 1");
1251: SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 1");
1.1 cgd 1252: sbunlock(&so->so_rcv);
1.196 dsl 1253: if (wakeup_state & SS_RESTARTSYS)
1254: error = ERESTART;
1255: else
1256: error = sbwait(&so->so_rcv);
1.160 ad 1257: if (error != 0) {
1258: sounlock(so);
1259: splx(s);
1.144 dyoung 1260: return error;
1.160 ad 1261: }
1.196 dsl 1262: wakeup_state = so->so_state;
1.1 cgd 1263: goto restart;
1264: }
1.54 lukem 1265: dontblock:
1.69 thorpej 1266: /*
1267: * On entry here, m points to the first record of the socket buffer.
1.159 ad 1268: * From this point onward, we maintain 'nextrecord' as a cache of the
1269: * pointer to the next record in the socket buffer. We must keep the
1270: * various socket buffer pointers and local stack versions of the
1271: * pointers in sync, pushing out modifications before dropping the
1.160 ad 1272: * socket lock, and re-reading them when picking it up.
1.159 ad 1273: *
1274: * Otherwise, we will race with the network stack appending new data
1275: * or records onto the socket buffer by using inconsistent/stale
1276: * versions of the field, possibly resulting in socket buffer
1277: * corruption.
1278: *
1279: * By holding the high-level sblock(), we prevent simultaneous
1280: * readers from pulling off the front of the socket buffer.
1.69 thorpej 1281: */
1.144 dyoung 1282: if (l != NULL)
1.157 ad 1283: l->l_ru.ru_msgrcv++;
1.69 thorpej 1284: KASSERT(m == so->so_rcv.sb_mb);
1285: SBLASTRECORDCHK(&so->so_rcv, "soreceive 1");
1286: SBLASTMBUFCHK(&so->so_rcv, "soreceive 1");
1.1 cgd 1287: nextrecord = m->m_nextpkt;
1288: if (pr->pr_flags & PR_ADDR) {
1289: #ifdef DIAGNOSTIC
1290: if (m->m_type != MT_SONAME)
1291: panic("receive 1a");
1292: #endif
1.3 andrew 1293: orig_resid = 0;
1.1 cgd 1294: if (flags & MSG_PEEK) {
1295: if (paddr)
1296: *paddr = m_copy(m, 0, m->m_len);
1297: m = m->m_next;
1298: } else {
1299: sbfree(&so->so_rcv, m);
1.67 he 1300: mbuf_removed = 1;
1.144 dyoung 1301: if (paddr != NULL) {
1.1 cgd 1302: *paddr = m;
1303: so->so_rcv.sb_mb = m->m_next;
1.144 dyoung 1304: m->m_next = NULL;
1.1 cgd 1305: m = so->so_rcv.sb_mb;
1306: } else {
1307: MFREE(m, so->so_rcv.sb_mb);
1308: m = so->so_rcv.sb_mb;
1309: }
1.159 ad 1310: sbsync(&so->so_rcv, nextrecord);
1.1 cgd 1311: }
1312: }
1.159 ad 1313:
1314: /*
1315: * Process one or more MT_CONTROL mbufs present before any data mbufs
1316: * in the first mbuf chain on the socket buffer. If MSG_PEEK, we
1317: * just copy the data; if !MSG_PEEK, we call into the protocol to
1318: * perform externalization (or freeing if controlp == NULL).
1319: */
1320: if (__predict_false(m != NULL && m->m_type == MT_CONTROL)) {
1321: struct mbuf *cm = NULL, *cmn;
1322: struct mbuf **cme = &cm;
1323:
1324: do {
1325: if (flags & MSG_PEEK) {
1326: if (controlp != NULL) {
1327: *controlp = m_copy(m, 0, m->m_len);
1328: controlp = &(*controlp)->m_next;
1329: }
1330: m = m->m_next;
1331: } else {
1332: sbfree(&so->so_rcv, m);
1.1 cgd 1333: so->so_rcv.sb_mb = m->m_next;
1.144 dyoung 1334: m->m_next = NULL;
1.159 ad 1335: *cme = m;
1336: cme = &(*cme)->m_next;
1.1 cgd 1337: m = so->so_rcv.sb_mb;
1.159 ad 1338: }
1339: } while (m != NULL && m->m_type == MT_CONTROL);
1340: if ((flags & MSG_PEEK) == 0)
1341: sbsync(&so->so_rcv, nextrecord);
1342: for (; cm != NULL; cm = cmn) {
1343: cmn = cm->m_next;
1344: cm->m_next = NULL;
1345: type = mtod(cm, struct cmsghdr *)->cmsg_type;
1346: if (controlp != NULL) {
1347: if (dom->dom_externalize != NULL &&
1348: type == SCM_RIGHTS) {
1.160 ad 1349: sounlock(so);
1.159 ad 1350: splx(s);
1.204 christos 1351: error = (*dom->dom_externalize)(cm, l,
1352: (flags & MSG_CMSG_CLOEXEC) ?
1353: O_CLOEXEC : 0);
1.159 ad 1354: s = splsoftnet();
1.160 ad 1355: solock(so);
1.159 ad 1356: }
1357: *controlp = cm;
1358: while (*controlp != NULL)
1359: controlp = &(*controlp)->m_next;
1.1 cgd 1360: } else {
1.106 itojun 1361: /*
1362: * Dispose of any SCM_RIGHTS message that went
1363: * through the read path rather than recv.
1364: */
1.159 ad 1365: if (dom->dom_dispose != NULL &&
1366: type == SCM_RIGHTS) {
1.160 ad 1367: sounlock(so);
1.159 ad 1368: (*dom->dom_dispose)(cm);
1.160 ad 1369: solock(so);
1.159 ad 1370: }
1371: m_freem(cm);
1.1 cgd 1372: }
1373: }
1.159 ad 1374: if (m != NULL)
1375: nextrecord = so->so_rcv.sb_mb->m_nextpkt;
1376: else
1377: nextrecord = so->so_rcv.sb_mb;
1378: orig_resid = 0;
1.1 cgd 1379: }
1.69 thorpej 1380:
1.159 ad 1381: /* If m is non-NULL, we have some data to read. */
1382: if (__predict_true(m != NULL)) {
1.1 cgd 1383: type = m->m_type;
1384: if (type == MT_OOBDATA)
1385: flags |= MSG_OOB;
1386: }
1.69 thorpej 1387: SBLASTRECORDCHK(&so->so_rcv, "soreceive 2");
1388: SBLASTMBUFCHK(&so->so_rcv, "soreceive 2");
1389:
1.1 cgd 1390: moff = 0;
1391: offset = 0;
1.144 dyoung 1392: while (m != NULL && uio->uio_resid > 0 && error == 0) {
1.1 cgd 1393: if (m->m_type == MT_OOBDATA) {
1394: if (type != MT_OOBDATA)
1395: break;
1396: } else if (type == MT_OOBDATA)
1397: break;
1398: #ifdef DIAGNOSTIC
1399: else if (m->m_type != MT_DATA && m->m_type != MT_HEADER)
1400: panic("receive 3");
1401: #endif
1402: so->so_state &= ~SS_RCVATMARK;
1.196 dsl 1403: wakeup_state = 0;
1.1 cgd 1404: len = uio->uio_resid;
1405: if (so->so_oobmark && len > so->so_oobmark - offset)
1406: len = so->so_oobmark - offset;
1407: if (len > m->m_len - moff)
1408: len = m->m_len - moff;
1409: /*
1410: * If mp is set, just pass back the mbufs.
1411: * Otherwise copy them out via the uio, then free.
1412: * Sockbuf must be consistent here (points to current mbuf,
1413: * it points to next record) when we drop priority;
1414: * we must note any additions to the sockbuf when we
1415: * block interrupts again.
1416: */
1.144 dyoung 1417: if (mp == NULL) {
1.69 thorpej 1418: SBLASTRECORDCHK(&so->so_rcv, "soreceive uiomove");
1419: SBLASTMBUFCHK(&so->so_rcv, "soreceive uiomove");
1.160 ad 1420: sounlock(so);
1.1 cgd 1421: splx(s);
1.134 christos 1422: error = uiomove(mtod(m, char *) + moff, (int)len, uio);
1.20 mycroft 1423: s = splsoftnet();
1.160 ad 1424: solock(so);
1.144 dyoung 1425: if (error != 0) {
1.67 he 1426: /*
1427: * If any part of the record has been removed
1428: * (such as the MT_SONAME mbuf, which will
1429: * happen when PR_ADDR, and thus also
1430: * PR_ATOMIC, is set), then drop the entire
1431: * record to maintain the atomicity of the
1432: * receive operation.
1433: *
1434: * This avoids a later panic("receive 1a")
1435: * when compiled with DIAGNOSTIC.
1436: */
1.146 dyoung 1437: if (m && mbuf_removed && atomic)
1.67 he 1438: (void) sbdroprecord(&so->so_rcv);
1439:
1.57 jdolecek 1440: goto release;
1.67 he 1441: }
1.1 cgd 1442: } else
1443: uio->uio_resid -= len;
1444: if (len == m->m_len - moff) {
1445: if (m->m_flags & M_EOR)
1446: flags |= MSG_EOR;
1447: if (flags & MSG_PEEK) {
1448: m = m->m_next;
1449: moff = 0;
1450: } else {
1451: nextrecord = m->m_nextpkt;
1452: sbfree(&so->so_rcv, m);
1453: if (mp) {
1454: *mp = m;
1455: mp = &m->m_next;
1456: so->so_rcv.sb_mb = m = m->m_next;
1.140 dyoung 1457: *mp = NULL;
1.1 cgd 1458: } else {
1459: MFREE(m, so->so_rcv.sb_mb);
1460: m = so->so_rcv.sb_mb;
1461: }
1.69 thorpej 1462: /*
1463: * If m != NULL, we also know that
1464: * so->so_rcv.sb_mb != NULL.
1465: */
1466: KASSERT(so->so_rcv.sb_mb == m);
1467: if (m) {
1.1 cgd 1468: m->m_nextpkt = nextrecord;
1.69 thorpej 1469: if (nextrecord == NULL)
1470: so->so_rcv.sb_lastrecord = m;
1471: } else {
1472: so->so_rcv.sb_mb = nextrecord;
1.70 thorpej 1473: SB_EMPTY_FIXUP(&so->so_rcv);
1.69 thorpej 1474: }
1475: SBLASTRECORDCHK(&so->so_rcv, "soreceive 3");
1476: SBLASTMBUFCHK(&so->so_rcv, "soreceive 3");
1.1 cgd 1477: }
1.144 dyoung 1478: } else if (flags & MSG_PEEK)
1479: moff += len;
1480: else {
1.160 ad 1481: if (mp != NULL) {
1482: mt = m_copym(m, 0, len, M_NOWAIT);
1483: if (__predict_false(mt == NULL)) {
1484: sounlock(so);
1485: mt = m_copym(m, 0, len, M_WAIT);
1486: solock(so);
1487: }
1488: *mp = mt;
1489: }
1.144 dyoung 1490: m->m_data += len;
1491: m->m_len -= len;
1492: so->so_rcv.sb_cc -= len;
1.1 cgd 1493: }
1494: if (so->so_oobmark) {
1495: if ((flags & MSG_PEEK) == 0) {
1496: so->so_oobmark -= len;
1497: if (so->so_oobmark == 0) {
1498: so->so_state |= SS_RCVATMARK;
1499: break;
1500: }
1.7 cgd 1501: } else {
1.1 cgd 1502: offset += len;
1.7 cgd 1503: if (offset == so->so_oobmark)
1504: break;
1505: }
1.1 cgd 1506: }
1507: if (flags & MSG_EOR)
1508: break;
1509: /*
1510: * If the MSG_WAITALL flag is set (for non-atomic socket),
1511: * we must not quit until "uio->uio_resid == 0" or an error
1512: * termination. If a signal/timeout occurs, return
1513: * with a short count but without error.
1514: * Keep sockbuf locked against other readers.
1515: */
1.144 dyoung 1516: while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 &&
1.3 andrew 1517: !sosendallatonce(so) && !nextrecord) {
1.1 cgd 1518: if (so->so_error || so->so_state & SS_CANTRCVMORE)
1519: break;
1.68 matt 1520: /*
1521: * If we are peeking and the socket receive buffer is
1522: * full, stop since we can't get more data to peek at.
1523: */
1524: if ((flags & MSG_PEEK) && sbspace(&so->so_rcv) <= 0)
1525: break;
1526: /*
1527: * If we've drained the socket buffer, tell the
1528: * protocol in case it needs to do something to
1529: * get it filled again.
1530: */
1531: if ((pr->pr_flags & PR_WANTRCVD) && so->so_pcb)
1532: (*pr->pr_usrreq)(so, PRU_RCVD,
1.140 dyoung 1533: NULL, (struct mbuf *)(long)flags, NULL, l);
1.69 thorpej 1534: SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 2");
1535: SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 2");
1.196 dsl 1536: if (wakeup_state & SS_RESTARTSYS)
1537: error = ERESTART;
1538: else
1539: error = sbwait(&so->so_rcv);
1.144 dyoung 1540: if (error != 0) {
1.1 cgd 1541: sbunlock(&so->so_rcv);
1.160 ad 1542: sounlock(so);
1.1 cgd 1543: splx(s);
1.144 dyoung 1544: return 0;
1.1 cgd 1545: }
1.21 christos 1546: if ((m = so->so_rcv.sb_mb) != NULL)
1.1 cgd 1547: nextrecord = m->m_nextpkt;
1.196 dsl 1548: wakeup_state = so->so_state;
1.1 cgd 1549: }
1550: }
1.3 andrew 1551:
1.146 dyoung 1552: if (m && atomic) {
1.3 andrew 1553: flags |= MSG_TRUNC;
1554: if ((flags & MSG_PEEK) == 0)
1555: (void) sbdroprecord(&so->so_rcv);
1556: }
1.1 cgd 1557: if ((flags & MSG_PEEK) == 0) {
1.144 dyoung 1558: if (m == NULL) {
1.69 thorpej 1559: /*
1.70 thorpej 1560: * First part is an inline SB_EMPTY_FIXUP(). Second
1.69 thorpej 1561: * part makes sure sb_lastrecord is up-to-date if
1562: * there is still data in the socket buffer.
1563: */
1.1 cgd 1564: so->so_rcv.sb_mb = nextrecord;
1.69 thorpej 1565: if (so->so_rcv.sb_mb == NULL) {
1566: so->so_rcv.sb_mbtail = NULL;
1567: so->so_rcv.sb_lastrecord = NULL;
1568: } else if (nextrecord->m_nextpkt == NULL)
1569: so->so_rcv.sb_lastrecord = nextrecord;
1570: }
1571: SBLASTRECORDCHK(&so->so_rcv, "soreceive 4");
1572: SBLASTMBUFCHK(&so->so_rcv, "soreceive 4");
1.1 cgd 1573: if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
1.140 dyoung 1574: (*pr->pr_usrreq)(so, PRU_RCVD, NULL,
1575: (struct mbuf *)(long)flags, NULL, l);
1.1 cgd 1576: }
1.3 andrew 1577: if (orig_resid == uio->uio_resid && orig_resid &&
1578: (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) {
1579: sbunlock(&so->so_rcv);
1580: goto restart;
1581: }
1.108 perry 1582:
1.144 dyoung 1583: if (flagsp != NULL)
1.1 cgd 1584: *flagsp |= flags;
1.54 lukem 1585: release:
1.1 cgd 1586: sbunlock(&so->so_rcv);
1.160 ad 1587: sounlock(so);
1.1 cgd 1588: splx(s);
1.144 dyoung 1589: return error;
1.1 cgd 1590: }
1591:
1.14 mycroft 1592: int
1.54 lukem 1593: soshutdown(struct socket *so, int how)
1.1 cgd 1594: {
1.99 matt 1595: const struct protosw *pr;
1.160 ad 1596: int error;
1597:
1598: KASSERT(solocked(so));
1.34 kleink 1599:
1.54 lukem 1600: pr = so->so_proto;
1.34 kleink 1601: if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR))
1602: return (EINVAL);
1.1 cgd 1603:
1.160 ad 1604: if (how == SHUT_RD || how == SHUT_RDWR) {
1.1 cgd 1605: sorflush(so);
1.160 ad 1606: error = 0;
1607: }
1.34 kleink 1608: if (how == SHUT_WR || how == SHUT_RDWR)
1.160 ad 1609: error = (*pr->pr_usrreq)(so, PRU_SHUTDOWN, NULL,
1.140 dyoung 1610: NULL, NULL, NULL);
1.160 ad 1611:
1612: return error;
1.1 cgd 1613: }
1614:
1.195 dsl 1615: void
1.196 dsl 1616: sorestart(struct socket *so)
1.188 ad 1617: {
1.196 dsl 1618: /*
1619: * An application has called close() on an fd on which another
1620: * of its threads has called a socket system call.
1621: * Mark this and wake everyone up, and code that would block again
1622: * instead returns ERESTART.
1623: * On system call re-entry the fd is validated and EBADF returned.
1624: * Any other fd will block again on the 2nd syscall.
1625: */
1.188 ad 1626: solock(so);
1.196 dsl 1627: so->so_state |= SS_RESTARTSYS;
1.188 ad 1628: cv_broadcast(&so->so_cv);
1.196 dsl 1629: cv_broadcast(&so->so_snd.sb_cv);
1630: cv_broadcast(&so->so_rcv.sb_cv);
1.188 ad 1631: sounlock(so);
1632: }
1633:
1.14 mycroft 1634: void
1.54 lukem 1635: sorflush(struct socket *so)
1.1 cgd 1636: {
1.54 lukem 1637: struct sockbuf *sb, asb;
1.99 matt 1638: const struct protosw *pr;
1.160 ad 1639:
1640: KASSERT(solocked(so));
1.1 cgd 1641:
1.54 lukem 1642: sb = &so->so_rcv;
1643: pr = so->so_proto;
1.160 ad 1644: socantrcvmore(so);
1.1 cgd 1645: sb->sb_flags |= SB_NOINTR;
1.160 ad 1646: (void )sblock(sb, M_WAITOK);
1.1 cgd 1647: sbunlock(sb);
1648: asb = *sb;
1.86 wrstuden 1649: /*
1650: * Clear most of the sockbuf structure, but leave some of the
1651: * fields valid.
1652: */
1653: memset(&sb->sb_startzero, 0,
1654: sizeof(*sb) - offsetof(struct sockbuf, sb_startzero));
1.160 ad 1655: if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose) {
1656: sounlock(so);
1.1 cgd 1657: (*pr->pr_domain->dom_dispose)(asb.sb_mb);
1.160 ad 1658: solock(so);
1659: }
1.98 christos 1660: sbrelease(&asb, so);
1.1 cgd 1661: }
1662:
1.171 plunky 1663: /*
1664: * internal set SOL_SOCKET options
1665: */
1.142 dyoung 1666: static int
1.171 plunky 1667: sosetopt1(struct socket *so, const struct sockopt *sopt)
1.1 cgd 1668: {
1.182 christos 1669: int error = EINVAL, optval, opt;
1.171 plunky 1670: struct linger l;
1671: struct timeval tv;
1.142 dyoung 1672:
1.179 christos 1673: switch ((opt = sopt->sopt_name)) {
1.142 dyoung 1674:
1.170 tls 1675: case SO_ACCEPTFILTER:
1.177 ad 1676: error = accept_filt_setopt(so, sopt);
1677: KASSERT(solocked(so));
1.170 tls 1678: break;
1679:
1.171 plunky 1680: case SO_LINGER:
1681: error = sockopt_get(sopt, &l, sizeof(l));
1.177 ad 1682: solock(so);
1.171 plunky 1683: if (error)
1.177 ad 1684: break;
1.171 plunky 1685: if (l.l_linger < 0 || l.l_linger > USHRT_MAX ||
1.177 ad 1686: l.l_linger > (INT_MAX / hz)) {
1687: error = EDOM;
1688: break;
1689: }
1.171 plunky 1690: so->so_linger = l.l_linger;
1691: if (l.l_onoff)
1692: so->so_options |= SO_LINGER;
1693: else
1694: so->so_options &= ~SO_LINGER;
1.177 ad 1695: break;
1.1 cgd 1696:
1.142 dyoung 1697: case SO_DEBUG:
1698: case SO_KEEPALIVE:
1699: case SO_DONTROUTE:
1700: case SO_USELOOPBACK:
1701: case SO_BROADCAST:
1702: case SO_REUSEADDR:
1703: case SO_REUSEPORT:
1704: case SO_OOBINLINE:
1705: case SO_TIMESTAMP:
1.205.2.1! yamt 1706: case SO_NOSIGPIPE:
1.184 christos 1707: #ifdef SO_OTIMESTAMP
1708: case SO_OTIMESTAMP:
1709: #endif
1.171 plunky 1710: error = sockopt_getint(sopt, &optval);
1.177 ad 1711: solock(so);
1.171 plunky 1712: if (error)
1.177 ad 1713: break;
1.171 plunky 1714: if (optval)
1.179 christos 1715: so->so_options |= opt;
1.142 dyoung 1716: else
1.179 christos 1717: so->so_options &= ~opt;
1.142 dyoung 1718: break;
1719:
1720: case SO_SNDBUF:
1721: case SO_RCVBUF:
1722: case SO_SNDLOWAT:
1723: case SO_RCVLOWAT:
1.171 plunky 1724: error = sockopt_getint(sopt, &optval);
1.177 ad 1725: solock(so);
1.171 plunky 1726: if (error)
1.177 ad 1727: break;
1.1 cgd 1728:
1.142 dyoung 1729: /*
1730: * Values < 1 make no sense for any of these
1731: * options, so disallow them.
1732: */
1.177 ad 1733: if (optval < 1) {
1734: error = EINVAL;
1735: break;
1736: }
1.1 cgd 1737:
1.179 christos 1738: switch (opt) {
1.171 plunky 1739: case SO_SNDBUF:
1.177 ad 1740: if (sbreserve(&so->so_snd, (u_long)optval, so) == 0) {
1741: error = ENOBUFS;
1742: break;
1743: }
1.171 plunky 1744: so->so_snd.sb_flags &= ~SB_AUTOSIZE;
1745: break;
1.1 cgd 1746:
1747: case SO_RCVBUF:
1.177 ad 1748: if (sbreserve(&so->so_rcv, (u_long)optval, so) == 0) {
1749: error = ENOBUFS;
1750: break;
1751: }
1.171 plunky 1752: so->so_rcv.sb_flags &= ~SB_AUTOSIZE;
1.142 dyoung 1753: break;
1754:
1755: /*
1756: * Make sure the low-water is never greater than
1757: * the high-water.
1758: */
1.1 cgd 1759: case SO_SNDLOWAT:
1.171 plunky 1760: if (optval > so->so_snd.sb_hiwat)
1761: optval = so->so_snd.sb_hiwat;
1762:
1763: so->so_snd.sb_lowat = optval;
1.142 dyoung 1764: break;
1.171 plunky 1765:
1.1 cgd 1766: case SO_RCVLOWAT:
1.171 plunky 1767: if (optval > so->so_rcv.sb_hiwat)
1768: optval = so->so_rcv.sb_hiwat;
1769:
1770: so->so_rcv.sb_lowat = optval;
1.142 dyoung 1771: break;
1772: }
1773: break;
1.28 thorpej 1774:
1.179 christos 1775: #ifdef COMPAT_50
1776: case SO_OSNDTIMEO:
1777: case SO_ORCVTIMEO: {
1778: struct timeval50 otv;
1779: error = sockopt_get(sopt, &otv, sizeof(otv));
1.186 pooka 1780: if (error) {
1781: solock(so);
1.183 christos 1782: break;
1.186 pooka 1783: }
1.179 christos 1784: timeval50_to_timeval(&otv, &tv);
1785: opt = opt == SO_OSNDTIMEO ? SO_SNDTIMEO : SO_RCVTIMEO;
1.182 christos 1786: error = 0;
1.179 christos 1787: /*FALLTHROUGH*/
1788: }
1789: #endif /* COMPAT_50 */
1790:
1.142 dyoung 1791: case SO_SNDTIMEO:
1792: case SO_RCVTIMEO:
1.182 christos 1793: if (error)
1.179 christos 1794: error = sockopt_get(sopt, &tv, sizeof(tv));
1.177 ad 1795: solock(so);
1.171 plunky 1796: if (error)
1.177 ad 1797: break;
1.171 plunky 1798:
1.177 ad 1799: if (tv.tv_sec > (INT_MAX - tv.tv_usec / tick) / hz) {
1800: error = EDOM;
1801: break;
1802: }
1.28 thorpej 1803:
1.171 plunky 1804: optval = tv.tv_sec * hz + tv.tv_usec / tick;
1805: if (optval == 0 && tv.tv_usec != 0)
1806: optval = 1;
1.28 thorpej 1807:
1.179 christos 1808: switch (opt) {
1.142 dyoung 1809: case SO_SNDTIMEO:
1.171 plunky 1810: so->so_snd.sb_timeo = optval;
1.1 cgd 1811: break;
1812: case SO_RCVTIMEO:
1.171 plunky 1813: so->so_rcv.sb_timeo = optval;
1.142 dyoung 1814: break;
1815: }
1816: break;
1.1 cgd 1817:
1.142 dyoung 1818: default:
1.177 ad 1819: solock(so);
1820: error = ENOPROTOOPT;
1821: break;
1.142 dyoung 1822: }
1.177 ad 1823: KASSERT(solocked(so));
1824: return error;
1.142 dyoung 1825: }
1.1 cgd 1826:
1.142 dyoung 1827: int
1.171 plunky 1828: sosetopt(struct socket *so, struct sockopt *sopt)
1.142 dyoung 1829: {
1830: int error, prerr;
1.1 cgd 1831:
1.177 ad 1832: if (sopt->sopt_level == SOL_SOCKET) {
1.171 plunky 1833: error = sosetopt1(so, sopt);
1.177 ad 1834: KASSERT(solocked(so));
1835: } else {
1.142 dyoung 1836: error = ENOPROTOOPT;
1.177 ad 1837: solock(so);
1838: }
1.1 cgd 1839:
1.142 dyoung 1840: if ((error == 0 || error == ENOPROTOOPT) &&
1841: so->so_proto != NULL && so->so_proto->pr_ctloutput != NULL) {
1842: /* give the protocol stack a shot */
1.171 plunky 1843: prerr = (*so->so_proto->pr_ctloutput)(PRCO_SETOPT, so, sopt);
1.142 dyoung 1844: if (prerr == 0)
1845: error = 0;
1846: else if (prerr != ENOPROTOOPT)
1847: error = prerr;
1.171 plunky 1848: }
1.160 ad 1849: sounlock(so);
1.142 dyoung 1850: return error;
1.1 cgd 1851: }
1852:
1.171 plunky 1853: /*
1854: * so_setsockopt() is a wrapper providing a sockopt structure for sosetopt()
1855: */
1856: int
1857: so_setsockopt(struct lwp *l, struct socket *so, int level, int name,
1858: const void *val, size_t valsize)
1859: {
1860: struct sockopt sopt;
1861: int error;
1862:
1863: KASSERT(valsize == 0 || val != NULL);
1864:
1865: sockopt_init(&sopt, level, name, valsize);
1866: sockopt_set(&sopt, val, valsize);
1867:
1868: error = sosetopt(so, &sopt);
1869:
1870: sockopt_destroy(&sopt);
1871:
1872: return error;
1873: }
1874:
1875: /*
1876: * internal get SOL_SOCKET options
1877: */
1878: static int
1879: sogetopt1(struct socket *so, struct sockopt *sopt)
1880: {
1.179 christos 1881: int error, optval, opt;
1.171 plunky 1882: struct linger l;
1883: struct timeval tv;
1884:
1.179 christos 1885: switch ((opt = sopt->sopt_name)) {
1.171 plunky 1886:
1887: case SO_ACCEPTFILTER:
1.177 ad 1888: error = accept_filt_getopt(so, sopt);
1.171 plunky 1889: break;
1890:
1891: case SO_LINGER:
1892: l.l_onoff = (so->so_options & SO_LINGER) ? 1 : 0;
1893: l.l_linger = so->so_linger;
1894:
1895: error = sockopt_set(sopt, &l, sizeof(l));
1896: break;
1897:
1898: case SO_USELOOPBACK:
1899: case SO_DONTROUTE:
1900: case SO_DEBUG:
1901: case SO_KEEPALIVE:
1902: case SO_REUSEADDR:
1903: case SO_REUSEPORT:
1904: case SO_BROADCAST:
1905: case SO_OOBINLINE:
1906: case SO_TIMESTAMP:
1.205.2.1! yamt 1907: case SO_NOSIGPIPE:
1.184 christos 1908: #ifdef SO_OTIMESTAMP
1909: case SO_OTIMESTAMP:
1910: #endif
1.179 christos 1911: error = sockopt_setint(sopt, (so->so_options & opt) ? 1 : 0);
1.171 plunky 1912: break;
1913:
1914: case SO_TYPE:
1915: error = sockopt_setint(sopt, so->so_type);
1916: break;
1917:
1918: case SO_ERROR:
1919: error = sockopt_setint(sopt, so->so_error);
1920: so->so_error = 0;
1921: break;
1922:
1923: case SO_SNDBUF:
1924: error = sockopt_setint(sopt, so->so_snd.sb_hiwat);
1925: break;
1926:
1927: case SO_RCVBUF:
1928: error = sockopt_setint(sopt, so->so_rcv.sb_hiwat);
1929: break;
1930:
1931: case SO_SNDLOWAT:
1932: error = sockopt_setint(sopt, so->so_snd.sb_lowat);
1933: break;
1934:
1935: case SO_RCVLOWAT:
1936: error = sockopt_setint(sopt, so->so_rcv.sb_lowat);
1937: break;
1938:
1.179 christos 1939: #ifdef COMPAT_50
1940: case SO_OSNDTIMEO:
1941: case SO_ORCVTIMEO: {
1942: struct timeval50 otv;
1943:
1944: optval = (opt == SO_OSNDTIMEO ?
1945: so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
1946:
1947: otv.tv_sec = optval / hz;
1948: otv.tv_usec = (optval % hz) * tick;
1949:
1950: error = sockopt_set(sopt, &otv, sizeof(otv));
1951: break;
1952: }
1953: #endif /* COMPAT_50 */
1954:
1.171 plunky 1955: case SO_SNDTIMEO:
1956: case SO_RCVTIMEO:
1.179 christos 1957: optval = (opt == SO_SNDTIMEO ?
1.171 plunky 1958: so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
1959:
1960: tv.tv_sec = optval / hz;
1961: tv.tv_usec = (optval % hz) * tick;
1962:
1963: error = sockopt_set(sopt, &tv, sizeof(tv));
1964: break;
1965:
1966: case SO_OVERFLOWED:
1967: error = sockopt_setint(sopt, so->so_rcv.sb_overflowed);
1968: break;
1969:
1970: default:
1971: error = ENOPROTOOPT;
1972: break;
1973: }
1974:
1975: return (error);
1976: }
1977:
1.14 mycroft 1978: int
1.171 plunky 1979: sogetopt(struct socket *so, struct sockopt *sopt)
1.1 cgd 1980: {
1.160 ad 1981: int error;
1.1 cgd 1982:
1.160 ad 1983: solock(so);
1.171 plunky 1984: if (sopt->sopt_level != SOL_SOCKET) {
1.1 cgd 1985: if (so->so_proto && so->so_proto->pr_ctloutput) {
1.160 ad 1986: error = ((*so->so_proto->pr_ctloutput)
1.171 plunky 1987: (PRCO_GETOPT, so, sopt));
1.1 cgd 1988: } else
1.160 ad 1989: error = (ENOPROTOOPT);
1.1 cgd 1990: } else {
1.171 plunky 1991: error = sogetopt1(so, sopt);
1992: }
1993: sounlock(so);
1994: return (error);
1995: }
1996:
1997: /*
1998: * alloc sockopt data buffer buffer
1999: * - will be released at destroy
2000: */
1.176 plunky 2001: static int
2002: sockopt_alloc(struct sockopt *sopt, size_t len, km_flag_t kmflag)
1.171 plunky 2003: {
2004:
2005: KASSERT(sopt->sopt_size == 0);
2006:
1.176 plunky 2007: if (len > sizeof(sopt->sopt_buf)) {
2008: sopt->sopt_data = kmem_zalloc(len, kmflag);
2009: if (sopt->sopt_data == NULL)
2010: return ENOMEM;
2011: } else
1.171 plunky 2012: sopt->sopt_data = sopt->sopt_buf;
2013:
2014: sopt->sopt_size = len;
1.176 plunky 2015: return 0;
1.171 plunky 2016: }
2017:
2018: /*
2019: * initialise sockopt storage
1.176 plunky 2020: * - MAY sleep during allocation
1.171 plunky 2021: */
2022: void
2023: sockopt_init(struct sockopt *sopt, int level, int name, size_t size)
2024: {
1.1 cgd 2025:
1.171 plunky 2026: memset(sopt, 0, sizeof(*sopt));
1.1 cgd 2027:
1.171 plunky 2028: sopt->sopt_level = level;
2029: sopt->sopt_name = name;
1.176 plunky 2030: (void)sockopt_alloc(sopt, size, KM_SLEEP);
1.171 plunky 2031: }
2032:
2033: /*
2034: * destroy sockopt storage
2035: * - will release any held memory references
2036: */
2037: void
2038: sockopt_destroy(struct sockopt *sopt)
2039: {
2040:
2041: if (sopt->sopt_data != sopt->sopt_buf)
1.173 plunky 2042: kmem_free(sopt->sopt_data, sopt->sopt_size);
1.171 plunky 2043:
2044: memset(sopt, 0, sizeof(*sopt));
2045: }
2046:
2047: /*
2048: * set sockopt value
2049: * - value is copied into sockopt
1.176 plunky 2050: * - memory is allocated when necessary, will not sleep
1.171 plunky 2051: */
2052: int
2053: sockopt_set(struct sockopt *sopt, const void *buf, size_t len)
2054: {
1.176 plunky 2055: int error;
1.171 plunky 2056:
1.176 plunky 2057: if (sopt->sopt_size == 0) {
2058: error = sockopt_alloc(sopt, len, KM_NOSLEEP);
2059: if (error)
2060: return error;
2061: }
1.171 plunky 2062:
2063: KASSERT(sopt->sopt_size == len);
2064: memcpy(sopt->sopt_data, buf, len);
2065: return 0;
2066: }
2067:
2068: /*
2069: * common case of set sockopt integer value
2070: */
2071: int
2072: sockopt_setint(struct sockopt *sopt, int val)
2073: {
2074:
2075: return sockopt_set(sopt, &val, sizeof(int));
2076: }
2077:
2078: /*
2079: * get sockopt value
2080: * - correct size must be given
2081: */
2082: int
2083: sockopt_get(const struct sockopt *sopt, void *buf, size_t len)
2084: {
1.170 tls 2085:
1.171 plunky 2086: if (sopt->sopt_size != len)
2087: return EINVAL;
1.1 cgd 2088:
1.171 plunky 2089: memcpy(buf, sopt->sopt_data, len);
2090: return 0;
2091: }
1.1 cgd 2092:
1.171 plunky 2093: /*
2094: * common case of get sockopt integer value
2095: */
2096: int
2097: sockopt_getint(const struct sockopt *sopt, int *valp)
2098: {
1.1 cgd 2099:
1.171 plunky 2100: return sockopt_get(sopt, valp, sizeof(int));
2101: }
1.1 cgd 2102:
1.171 plunky 2103: /*
2104: * set sockopt value from mbuf
2105: * - ONLY for legacy code
2106: * - mbuf is released by sockopt
1.176 plunky 2107: * - will not sleep
1.171 plunky 2108: */
2109: int
2110: sockopt_setmbuf(struct sockopt *sopt, struct mbuf *m)
2111: {
2112: size_t len;
1.176 plunky 2113: int error;
1.1 cgd 2114:
1.171 plunky 2115: len = m_length(m);
1.1 cgd 2116:
1.176 plunky 2117: if (sopt->sopt_size == 0) {
2118: error = sockopt_alloc(sopt, len, KM_NOSLEEP);
2119: if (error)
2120: return error;
2121: }
1.1 cgd 2122:
1.171 plunky 2123: KASSERT(sopt->sopt_size == len);
2124: m_copydata(m, 0, len, sopt->sopt_data);
2125: m_freem(m);
1.1 cgd 2126:
1.171 plunky 2127: return 0;
2128: }
1.1 cgd 2129:
1.171 plunky 2130: /*
2131: * get sockopt value into mbuf
2132: * - ONLY for legacy code
2133: * - mbuf to be released by the caller
1.176 plunky 2134: * - will not sleep
1.171 plunky 2135: */
2136: struct mbuf *
2137: sockopt_getmbuf(const struct sockopt *sopt)
2138: {
2139: struct mbuf *m;
1.107 darrenr 2140:
1.176 plunky 2141: if (sopt->sopt_size > MCLBYTES)
2142: return NULL;
2143:
2144: m = m_get(M_DONTWAIT, MT_SOOPTS);
1.171 plunky 2145: if (m == NULL)
2146: return NULL;
2147:
1.176 plunky 2148: if (sopt->sopt_size > MLEN) {
2149: MCLGET(m, M_DONTWAIT);
2150: if ((m->m_flags & M_EXT) == 0) {
2151: m_free(m);
2152: return NULL;
2153: }
1.1 cgd 2154: }
1.176 plunky 2155:
2156: memcpy(mtod(m, void *), sopt->sopt_data, sopt->sopt_size);
2157: m->m_len = sopt->sopt_size;
1.160 ad 2158:
1.171 plunky 2159: return m;
1.1 cgd 2160: }
2161:
1.14 mycroft 2162: void
1.54 lukem 2163: sohasoutofband(struct socket *so)
1.1 cgd 2164: {
1.153 rmind 2165:
1.90 christos 2166: fownsignal(so->so_pgid, SIGURG, POLL_PRI, POLLPRI|POLLRDBAND, so);
1.189 ad 2167: selnotify(&so->so_rcv.sb_sel, POLLPRI | POLLRDBAND, NOTE_SUBMIT);
1.1 cgd 2168: }
1.72 jdolecek 2169:
2170: static void
2171: filt_sordetach(struct knote *kn)
2172: {
2173: struct socket *so;
2174:
1.155 ad 2175: so = ((file_t *)kn->kn_obj)->f_data;
1.160 ad 2176: solock(so);
1.73 christos 2177: SLIST_REMOVE(&so->so_rcv.sb_sel.sel_klist, kn, knote, kn_selnext);
2178: if (SLIST_EMPTY(&so->so_rcv.sb_sel.sel_klist))
1.72 jdolecek 2179: so->so_rcv.sb_flags &= ~SB_KNOTE;
1.160 ad 2180: sounlock(so);
1.72 jdolecek 2181: }
2182:
2183: /*ARGSUSED*/
2184: static int
1.129 yamt 2185: filt_soread(struct knote *kn, long hint)
1.72 jdolecek 2186: {
2187: struct socket *so;
1.160 ad 2188: int rv;
1.72 jdolecek 2189:
1.155 ad 2190: so = ((file_t *)kn->kn_obj)->f_data;
1.160 ad 2191: if (hint != NOTE_SUBMIT)
2192: solock(so);
1.72 jdolecek 2193: kn->kn_data = so->so_rcv.sb_cc;
2194: if (so->so_state & SS_CANTRCVMORE) {
1.108 perry 2195: kn->kn_flags |= EV_EOF;
1.72 jdolecek 2196: kn->kn_fflags = so->so_error;
1.160 ad 2197: rv = 1;
2198: } else if (so->so_error) /* temporary udp error */
2199: rv = 1;
2200: else if (kn->kn_sfflags & NOTE_LOWAT)
2201: rv = (kn->kn_data >= kn->kn_sdata);
2202: else
2203: rv = (kn->kn_data >= so->so_rcv.sb_lowat);
2204: if (hint != NOTE_SUBMIT)
2205: sounlock(so);
2206: return rv;
1.72 jdolecek 2207: }
2208:
2209: static void
2210: filt_sowdetach(struct knote *kn)
2211: {
2212: struct socket *so;
2213:
1.155 ad 2214: so = ((file_t *)kn->kn_obj)->f_data;
1.160 ad 2215: solock(so);
1.73 christos 2216: SLIST_REMOVE(&so->so_snd.sb_sel.sel_klist, kn, knote, kn_selnext);
2217: if (SLIST_EMPTY(&so->so_snd.sb_sel.sel_klist))
1.72 jdolecek 2218: so->so_snd.sb_flags &= ~SB_KNOTE;
1.160 ad 2219: sounlock(so);
1.72 jdolecek 2220: }
2221:
2222: /*ARGSUSED*/
2223: static int
1.129 yamt 2224: filt_sowrite(struct knote *kn, long hint)
1.72 jdolecek 2225: {
2226: struct socket *so;
1.160 ad 2227: int rv;
1.72 jdolecek 2228:
1.155 ad 2229: so = ((file_t *)kn->kn_obj)->f_data;
1.160 ad 2230: if (hint != NOTE_SUBMIT)
2231: solock(so);
1.72 jdolecek 2232: kn->kn_data = sbspace(&so->so_snd);
2233: if (so->so_state & SS_CANTSENDMORE) {
1.108 perry 2234: kn->kn_flags |= EV_EOF;
1.72 jdolecek 2235: kn->kn_fflags = so->so_error;
1.160 ad 2236: rv = 1;
2237: } else if (so->so_error) /* temporary udp error */
2238: rv = 1;
2239: else if (((so->so_state & SS_ISCONNECTED) == 0) &&
1.72 jdolecek 2240: (so->so_proto->pr_flags & PR_CONNREQUIRED))
1.160 ad 2241: rv = 0;
2242: else if (kn->kn_sfflags & NOTE_LOWAT)
2243: rv = (kn->kn_data >= kn->kn_sdata);
2244: else
2245: rv = (kn->kn_data >= so->so_snd.sb_lowat);
2246: if (hint != NOTE_SUBMIT)
2247: sounlock(so);
2248: return rv;
1.72 jdolecek 2249: }
2250:
2251: /*ARGSUSED*/
2252: static int
1.129 yamt 2253: filt_solisten(struct knote *kn, long hint)
1.72 jdolecek 2254: {
2255: struct socket *so;
1.160 ad 2256: int rv;
1.72 jdolecek 2257:
1.155 ad 2258: so = ((file_t *)kn->kn_obj)->f_data;
1.72 jdolecek 2259:
2260: /*
2261: * Set kn_data to number of incoming connections, not
2262: * counting partial (incomplete) connections.
1.108 perry 2263: */
1.160 ad 2264: if (hint != NOTE_SUBMIT)
2265: solock(so);
1.72 jdolecek 2266: kn->kn_data = so->so_qlen;
1.160 ad 2267: rv = (kn->kn_data > 0);
2268: if (hint != NOTE_SUBMIT)
2269: sounlock(so);
2270: return rv;
1.72 jdolecek 2271: }
2272:
2273: static const struct filterops solisten_filtops =
2274: { 1, NULL, filt_sordetach, filt_solisten };
2275: static const struct filterops soread_filtops =
2276: { 1, NULL, filt_sordetach, filt_soread };
2277: static const struct filterops sowrite_filtops =
2278: { 1, NULL, filt_sowdetach, filt_sowrite };
2279:
2280: int
1.129 yamt 2281: soo_kqfilter(struct file *fp, struct knote *kn)
1.72 jdolecek 2282: {
2283: struct socket *so;
2284: struct sockbuf *sb;
2285:
1.155 ad 2286: so = ((file_t *)kn->kn_obj)->f_data;
1.160 ad 2287: solock(so);
1.72 jdolecek 2288: switch (kn->kn_filter) {
2289: case EVFILT_READ:
2290: if (so->so_options & SO_ACCEPTCONN)
2291: kn->kn_fop = &solisten_filtops;
2292: else
2293: kn->kn_fop = &soread_filtops;
2294: sb = &so->so_rcv;
2295: break;
2296: case EVFILT_WRITE:
2297: kn->kn_fop = &sowrite_filtops;
2298: sb = &so->so_snd;
2299: break;
2300: default:
1.160 ad 2301: sounlock(so);
1.149 pooka 2302: return (EINVAL);
1.72 jdolecek 2303: }
1.73 christos 2304: SLIST_INSERT_HEAD(&sb->sb_sel.sel_klist, kn, kn_selnext);
1.72 jdolecek 2305: sb->sb_flags |= SB_KNOTE;
1.160 ad 2306: sounlock(so);
1.72 jdolecek 2307: return (0);
2308: }
2309:
1.154 ad 2310: static int
2311: sodopoll(struct socket *so, int events)
2312: {
2313: int revents;
2314:
2315: revents = 0;
2316:
2317: if (events & (POLLIN | POLLRDNORM))
2318: if (soreadable(so))
2319: revents |= events & (POLLIN | POLLRDNORM);
2320:
2321: if (events & (POLLOUT | POLLWRNORM))
2322: if (sowritable(so))
2323: revents |= events & (POLLOUT | POLLWRNORM);
2324:
2325: if (events & (POLLPRI | POLLRDBAND))
2326: if (so->so_oobmark || (so->so_state & SS_RCVATMARK))
2327: revents |= events & (POLLPRI | POLLRDBAND);
2328:
2329: return revents;
2330: }
2331:
2332: int
2333: sopoll(struct socket *so, int events)
2334: {
2335: int revents = 0;
2336:
1.160 ad 2337: #ifndef DIAGNOSTIC
2338: /*
2339: * Do a quick, unlocked check in expectation that the socket
2340: * will be ready for I/O. Don't do this check if DIAGNOSTIC,
2341: * as the solocked() assertions will fail.
2342: */
1.154 ad 2343: if ((revents = sodopoll(so, events)) != 0)
2344: return revents;
1.160 ad 2345: #endif
1.154 ad 2346:
1.160 ad 2347: solock(so);
1.154 ad 2348: if ((revents = sodopoll(so, events)) == 0) {
2349: if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
2350: selrecord(curlwp, &so->so_rcv.sb_sel);
1.160 ad 2351: so->so_rcv.sb_flags |= SB_NOTIFY;
1.154 ad 2352: }
2353:
2354: if (events & (POLLOUT | POLLWRNORM)) {
2355: selrecord(curlwp, &so->so_snd.sb_sel);
1.160 ad 2356: so->so_snd.sb_flags |= SB_NOTIFY;
1.154 ad 2357: }
2358: }
1.160 ad 2359: sounlock(so);
1.154 ad 2360:
2361: return revents;
2362: }
2363:
2364:
1.94 yamt 2365: #include <sys/sysctl.h>
2366:
2367: static int sysctl_kern_somaxkva(SYSCTLFN_PROTO);
2368:
2369: /*
2370: * sysctl helper routine for kern.somaxkva. ensures that the given
2371: * value is not too small.
2372: * (XXX should we maybe make sure it's not too large as well?)
2373: */
2374: static int
2375: sysctl_kern_somaxkva(SYSCTLFN_ARGS)
2376: {
2377: int error, new_somaxkva;
2378: struct sysctlnode node;
2379:
2380: new_somaxkva = somaxkva;
2381: node = *rnode;
2382: node.sysctl_data = &new_somaxkva;
2383: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2384: if (error || newp == NULL)
2385: return (error);
2386:
2387: if (new_somaxkva < (16 * 1024 * 1024)) /* sanity */
2388: return (EINVAL);
2389:
1.136 ad 2390: mutex_enter(&so_pendfree_lock);
1.94 yamt 2391: somaxkva = new_somaxkva;
1.136 ad 2392: cv_broadcast(&socurkva_cv);
2393: mutex_exit(&so_pendfree_lock);
1.94 yamt 2394:
2395: return (error);
2396: }
2397:
1.178 pooka 2398: static void
1.187 cegger 2399: sysctl_kern_somaxkva_setup(void)
1.94 yamt 2400: {
2401:
1.178 pooka 2402: KASSERT(socket_sysctllog == NULL);
2403: sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
1.97 atatat 2404: CTLFLAG_PERMANENT,
2405: CTLTYPE_NODE, "kern", NULL,
2406: NULL, 0, NULL, 0,
2407: CTL_KERN, CTL_EOL);
2408:
1.178 pooka 2409: sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
1.97 atatat 2410: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.103 atatat 2411: CTLTYPE_INT, "somaxkva",
2412: SYSCTL_DESCR("Maximum amount of kernel memory to be "
2413: "used for socket buffers"),
1.94 yamt 2414: sysctl_kern_somaxkva, 0, NULL, 0,
2415: CTL_KERN, KERN_SOMAXKVA, CTL_EOL);
2416: }
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