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1 | /* | |
2 | * Copyright (c) 2003-2012 Apple Inc. All rights reserved. | |
3 | * | |
4 | * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ | |
5 | * | |
6 | * This file contains Original Code and/or Modifications of Original Code | |
7 | * as defined in and that are subject to the Apple Public Source License | |
8 | * Version 2.0 (the 'License'). You may not use this file except in | |
9 | * compliance with the License. The rights granted to you under the License | |
10 | * may not be used to create, or enable the creation or redistribution of, | |
11 | * unlawful or unlicensed copies of an Apple operating system, or to | |
12 | * circumvent, violate, or enable the circumvention or violation of, any | |
13 | * terms of an Apple operating system software license agreement. | |
14 | * | |
15 | * Please obtain a copy of the License at | |
16 | * http://www.opensource.apple.com/apsl/ and read it before using this file. | |
17 | * | |
18 | * The Original Code and all software distributed under the License are | |
19 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
20 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, | |
21 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
22 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. | |
23 | * Please see the License for the specific language governing rights and | |
24 | * limitations under the License. | |
25 | * | |
26 | * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ | |
27 | */ | |
28 | ||
29 | #define __KPI__ | |
30 | #include <sys/systm.h> | |
31 | #include <sys/kernel.h> | |
32 | #include <sys/types.h> | |
33 | #include <sys/socket.h> | |
34 | #include <sys/socketvar.h> | |
35 | #include <sys/param.h> | |
36 | #include <sys/proc.h> | |
37 | #include <sys/errno.h> | |
38 | #include <sys/malloc.h> | |
39 | #include <sys/protosw.h> | |
40 | #include <sys/domain.h> | |
41 | #include <sys/mbuf.h> | |
42 | #include <sys/fcntl.h> | |
43 | #include <sys/filio.h> | |
44 | #include <sys/uio_internal.h> | |
45 | #include <kern/locks.h> | |
46 | #include <netinet/in.h> | |
47 | #include <libkern/OSAtomic.h> | |
48 | ||
49 | static errno_t sock_send_internal(socket_t, const struct msghdr *, | |
50 | mbuf_t, int, size_t *); | |
51 | static void sock_setupcalls_common(socket_t, sock_upcall, void *, | |
52 | sock_upcall, void *); | |
53 | ||
54 | errno_t | |
55 | sock_accept(socket_t sock, struct sockaddr *from, int fromlen, int flags, | |
56 | sock_upcall callback, void *cookie, socket_t *new_sock) | |
57 | { | |
58 | struct sockaddr *sa; | |
59 | struct socket *new_so; | |
60 | lck_mtx_t *mutex_held; | |
61 | int dosocklock; | |
62 | errno_t error = 0; | |
63 | ||
64 | if (sock == NULL || new_sock == NULL) | |
65 | return (EINVAL); | |
66 | ||
67 | socket_lock(sock, 1); | |
68 | if ((sock->so_options & SO_ACCEPTCONN) == 0) { | |
69 | socket_unlock(sock, 1); | |
70 | return (EINVAL); | |
71 | } | |
72 | if ((flags & ~(MSG_DONTWAIT)) != 0) { | |
73 | socket_unlock(sock, 1); | |
74 | return (ENOTSUP); | |
75 | } | |
76 | if (((flags & MSG_DONTWAIT) != 0 || (sock->so_state & SS_NBIO) != 0) && | |
77 | sock->so_comp.tqh_first == NULL) { | |
78 | socket_unlock(sock, 1); | |
79 | return (EWOULDBLOCK); | |
80 | } | |
81 | ||
82 | if (sock->so_proto->pr_getlock != NULL) { | |
83 | mutex_held = (*sock->so_proto->pr_getlock)(sock, 0); | |
84 | dosocklock = 1; | |
85 | } else { | |
86 | mutex_held = sock->so_proto->pr_domain->dom_mtx; | |
87 | dosocklock = 0; | |
88 | } | |
89 | ||
90 | while (TAILQ_EMPTY(&sock->so_comp) && sock->so_error == 0) { | |
91 | if (sock->so_state & SS_CANTRCVMORE) { | |
92 | sock->so_error = ECONNABORTED; | |
93 | break; | |
94 | } | |
95 | error = msleep((caddr_t)&sock->so_timeo, mutex_held, | |
96 | PSOCK | PCATCH, "sock_accept", NULL); | |
97 | if (error != 0) { | |
98 | socket_unlock(sock, 1); | |
99 | return (error); | |
100 | } | |
101 | } | |
102 | if (sock->so_error != 0) { | |
103 | error = sock->so_error; | |
104 | sock->so_error = 0; | |
105 | socket_unlock(sock, 1); | |
106 | return (error); | |
107 | } | |
108 | ||
109 | new_so = TAILQ_FIRST(&sock->so_comp); | |
110 | TAILQ_REMOVE(&sock->so_comp, new_so, so_list); | |
111 | sock->so_qlen--; | |
112 | ||
113 | /* | |
114 | * Pass the pre-accepted socket to any interested socket filter(s). | |
115 | * Upon failure, the socket would have been closed by the callee. | |
116 | */ | |
117 | if (new_so->so_filt != NULL) { | |
118 | /* | |
119 | * Temporarily drop the listening socket's lock before we | |
120 | * hand off control over to the socket filter(s), but keep | |
121 | * a reference so that it won't go away. We'll grab it | |
122 | * again once we're done with the filter(s). | |
123 | */ | |
124 | socket_unlock(sock, 0); | |
125 | if ((error = soacceptfilter(new_so)) != 0) { | |
126 | /* Drop reference on listening socket */ | |
127 | sodereference(sock); | |
128 | return (error); | |
129 | } | |
130 | socket_lock(sock, 0); | |
131 | } | |
132 | ||
133 | if (dosocklock) { | |
134 | lck_mtx_assert(new_so->so_proto->pr_getlock(new_so, 0), | |
135 | LCK_MTX_ASSERT_NOTOWNED); | |
136 | socket_lock(new_so, 1); | |
137 | } | |
138 | ||
139 | new_so->so_state &= ~SS_COMP; | |
140 | new_so->so_head = NULL; | |
141 | (void) soacceptlock(new_so, &sa, 0); | |
142 | ||
143 | socket_unlock(sock, 1); /* release the head */ | |
144 | ||
145 | /* see comments in sock_setupcall() */ | |
146 | if (callback != NULL) { | |
147 | sock_setupcalls_common(new_so, callback, cookie, NULL, NULL); | |
148 | } | |
149 | ||
150 | if (sa != NULL && from != NULL) { | |
151 | if (fromlen > sa->sa_len) | |
152 | fromlen = sa->sa_len; | |
153 | memcpy(from, sa, fromlen); | |
154 | } | |
155 | if (sa != NULL) | |
156 | FREE(sa, M_SONAME); | |
157 | ||
158 | /* | |
159 | * If the socket has been marked as inactive by sosetdefunct(), | |
160 | * disallow further operations on it. | |
161 | */ | |
162 | if (new_so->so_flags & SOF_DEFUNCT) { | |
163 | (void) sodefunct(current_proc(), new_so, | |
164 | SHUTDOWN_SOCKET_LEVEL_DISCONNECT_INTERNAL); | |
165 | } | |
166 | *new_sock = new_so; | |
167 | if (dosocklock) | |
168 | socket_unlock(new_so, 1); | |
169 | return (error); | |
170 | } | |
171 | ||
172 | errno_t | |
173 | sock_bind(socket_t sock, const struct sockaddr *to) | |
174 | { | |
175 | int error = 0; | |
176 | struct sockaddr *sa = NULL; | |
177 | struct sockaddr_storage ss; | |
178 | boolean_t want_free = TRUE; | |
179 | ||
180 | if (sock == NULL || to == NULL) | |
181 | return (EINVAL); | |
182 | ||
183 | if (to->sa_len > sizeof (ss)) { | |
184 | MALLOC(sa, struct sockaddr *, to->sa_len, M_SONAME, M_WAITOK); | |
185 | if (sa == NULL) | |
186 | return (ENOBUFS); | |
187 | } else { | |
188 | sa = (struct sockaddr *)&ss; | |
189 | want_free = FALSE; | |
190 | } | |
191 | memcpy(sa, to, to->sa_len); | |
192 | ||
193 | error = sobindlock(sock, sa, 1); /* will lock socket */ | |
194 | ||
195 | if (sa != NULL && want_free == TRUE) | |
196 | FREE(sa, M_SONAME); | |
197 | ||
198 | return (error); | |
199 | } | |
200 | ||
201 | errno_t | |
202 | sock_connect(socket_t sock, const struct sockaddr *to, int flags) | |
203 | { | |
204 | int error = 0; | |
205 | lck_mtx_t *mutex_held; | |
206 | struct sockaddr *sa = NULL; | |
207 | struct sockaddr_storage ss; | |
208 | boolean_t want_free = TRUE; | |
209 | ||
210 | if (sock == NULL || to == NULL) | |
211 | return (EINVAL); | |
212 | ||
213 | if (to->sa_len > sizeof (ss)) { | |
214 | MALLOC(sa, struct sockaddr *, to->sa_len, M_SONAME, | |
215 | (flags & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK); | |
216 | if (sa == NULL) | |
217 | return (ENOBUFS); | |
218 | } else { | |
219 | sa = (struct sockaddr *)&ss; | |
220 | want_free = FALSE; | |
221 | } | |
222 | memcpy(sa, to, to->sa_len); | |
223 | ||
224 | socket_lock(sock, 1); | |
225 | ||
226 | if ((sock->so_state & SS_ISCONNECTING) && | |
227 | ((sock->so_state & SS_NBIO) != 0 || (flags & MSG_DONTWAIT) != 0)) { | |
228 | error = EALREADY; | |
229 | goto out; | |
230 | } | |
231 | error = soconnectlock(sock, sa, 0); | |
232 | if (!error) { | |
233 | if ((sock->so_state & SS_ISCONNECTING) && | |
234 | ((sock->so_state & SS_NBIO) != 0 || | |
235 | (flags & MSG_DONTWAIT) != 0)) { | |
236 | error = EINPROGRESS; | |
237 | goto out; | |
238 | } | |
239 | ||
240 | if (sock->so_proto->pr_getlock != NULL) | |
241 | mutex_held = (*sock->so_proto->pr_getlock)(sock, 0); | |
242 | else | |
243 | mutex_held = sock->so_proto->pr_domain->dom_mtx; | |
244 | ||
245 | while ((sock->so_state & SS_ISCONNECTING) && | |
246 | sock->so_error == 0) { | |
247 | error = msleep((caddr_t)&sock->so_timeo, | |
248 | mutex_held, PSOCK | PCATCH, "sock_connect", NULL); | |
249 | if (error != 0) | |
250 | break; | |
251 | } | |
252 | ||
253 | if (error == 0) { | |
254 | error = sock->so_error; | |
255 | sock->so_error = 0; | |
256 | } | |
257 | } else { | |
258 | sock->so_state &= ~SS_ISCONNECTING; | |
259 | } | |
260 | out: | |
261 | socket_unlock(sock, 1); | |
262 | ||
263 | if (sa != NULL && want_free == TRUE) | |
264 | FREE(sa, M_SONAME); | |
265 | ||
266 | return (error); | |
267 | } | |
268 | ||
269 | errno_t | |
270 | sock_connectwait(socket_t sock, const struct timeval *tv) | |
271 | { | |
272 | lck_mtx_t *mutex_held; | |
273 | errno_t retval = 0; | |
274 | struct timespec ts; | |
275 | ||
276 | socket_lock(sock, 1); | |
277 | ||
278 | /* Check if we're already connected or if we've already errored out */ | |
279 | if ((sock->so_state & SS_ISCONNECTING) == 0 || sock->so_error != 0) { | |
280 | if (sock->so_error != 0) { | |
281 | retval = sock->so_error; | |
282 | sock->so_error = 0; | |
283 | } else { | |
284 | if ((sock->so_state & SS_ISCONNECTED) != 0) | |
285 | retval = 0; | |
286 | else | |
287 | retval = EINVAL; | |
288 | } | |
289 | goto done; | |
290 | } | |
291 | ||
292 | /* copied translation from timeval to hertz from SO_RCVTIMEO handling */ | |
293 | if (tv->tv_sec < 0 || tv->tv_sec > SHRT_MAX / hz || | |
294 | tv->tv_usec < 0 || tv->tv_usec >= 1000000) { | |
295 | retval = EDOM; | |
296 | goto done; | |
297 | } | |
298 | ||
299 | ts.tv_sec = tv->tv_sec; | |
300 | ts.tv_nsec = (tv->tv_usec * (integer_t)NSEC_PER_USEC); | |
301 | if ((ts.tv_sec + (ts.tv_nsec/(long)NSEC_PER_SEC))/100 > SHRT_MAX) { | |
302 | retval = EDOM; | |
303 | goto done; | |
304 | } | |
305 | ||
306 | if (sock->so_proto->pr_getlock != NULL) | |
307 | mutex_held = (*sock->so_proto->pr_getlock)(sock, 0); | |
308 | else | |
309 | mutex_held = sock->so_proto->pr_domain->dom_mtx; | |
310 | ||
311 | msleep((caddr_t)&sock->so_timeo, mutex_held, | |
312 | PSOCK, "sock_connectwait", &ts); | |
313 | ||
314 | /* Check if we're still waiting to connect */ | |
315 | if ((sock->so_state & SS_ISCONNECTING) && sock->so_error == 0) { | |
316 | retval = EINPROGRESS; | |
317 | goto done; | |
318 | } | |
319 | ||
320 | if (sock->so_error != 0) { | |
321 | retval = sock->so_error; | |
322 | sock->so_error = 0; | |
323 | } | |
324 | ||
325 | done: | |
326 | socket_unlock(sock, 1); | |
327 | return (retval); | |
328 | } | |
329 | ||
330 | errno_t | |
331 | sock_nointerrupt(socket_t sock, int on) | |
332 | { | |
333 | socket_lock(sock, 1); | |
334 | ||
335 | if (on) { | |
336 | sock->so_rcv.sb_flags |= SB_NOINTR; /* This isn't safe */ | |
337 | sock->so_snd.sb_flags |= SB_NOINTR; /* This isn't safe */ | |
338 | } else { | |
339 | sock->so_rcv.sb_flags &= ~SB_NOINTR; /* This isn't safe */ | |
340 | sock->so_snd.sb_flags &= ~SB_NOINTR; /* This isn't safe */ | |
341 | } | |
342 | ||
343 | socket_unlock(sock, 1); | |
344 | ||
345 | return (0); | |
346 | } | |
347 | ||
348 | errno_t | |
349 | sock_getpeername(socket_t sock, struct sockaddr *peername, int peernamelen) | |
350 | { | |
351 | int error; | |
352 | struct sockaddr *sa = NULL; | |
353 | ||
354 | if (sock == NULL || peername == NULL || peernamelen < 0) | |
355 | return (EINVAL); | |
356 | ||
357 | socket_lock(sock, 1); | |
358 | if (!(sock->so_state & (SS_ISCONNECTED|SS_ISCONFIRMING))) { | |
359 | socket_unlock(sock, 1); | |
360 | return (ENOTCONN); | |
361 | } | |
362 | error = sogetaddr_locked(sock, &sa, 1); | |
363 | socket_unlock(sock, 1); | |
364 | if (error == 0) { | |
365 | if (peernamelen > sa->sa_len) | |
366 | peernamelen = sa->sa_len; | |
367 | memcpy(peername, sa, peernamelen); | |
368 | FREE(sa, M_SONAME); | |
369 | } | |
370 | return (error); | |
371 | } | |
372 | ||
373 | errno_t | |
374 | sock_getsockname(socket_t sock, struct sockaddr *sockname, int socknamelen) | |
375 | { | |
376 | int error; | |
377 | struct sockaddr *sa = NULL; | |
378 | ||
379 | if (sock == NULL || sockname == NULL || socknamelen < 0) | |
380 | return (EINVAL); | |
381 | ||
382 | socket_lock(sock, 1); | |
383 | error = sogetaddr_locked(sock, &sa, 0); | |
384 | socket_unlock(sock, 1); | |
385 | if (error == 0) { | |
386 | if (socknamelen > sa->sa_len) | |
387 | socknamelen = sa->sa_len; | |
388 | memcpy(sockname, sa, socknamelen); | |
389 | FREE(sa, M_SONAME); | |
390 | } | |
391 | return (error); | |
392 | } | |
393 | ||
394 | __private_extern__ int | |
395 | sogetaddr_locked(struct socket *so, struct sockaddr **psa, int peer) | |
396 | { | |
397 | int error; | |
398 | ||
399 | if (so == NULL || psa == NULL) | |
400 | return (EINVAL); | |
401 | ||
402 | *psa = NULL; | |
403 | error = peer ? so->so_proto->pr_usrreqs->pru_peeraddr(so, psa) : | |
404 | so->so_proto->pr_usrreqs->pru_sockaddr(so, psa); | |
405 | ||
406 | if (error == 0 && *psa == NULL) { | |
407 | error = ENOMEM; | |
408 | } else if (error != 0 && *psa != NULL) { | |
409 | FREE(*psa, M_SONAME); | |
410 | *psa = NULL; | |
411 | } | |
412 | return (error); | |
413 | } | |
414 | ||
415 | errno_t | |
416 | sock_getaddr(socket_t sock, struct sockaddr **psa, int peer) | |
417 | { | |
418 | int error; | |
419 | ||
420 | if (sock == NULL || psa == NULL) | |
421 | return (EINVAL); | |
422 | ||
423 | socket_lock(sock, 1); | |
424 | error = sogetaddr_locked(sock, psa, peer); | |
425 | socket_unlock(sock, 1); | |
426 | ||
427 | return (error); | |
428 | } | |
429 | ||
430 | void | |
431 | sock_freeaddr(struct sockaddr *sa) | |
432 | { | |
433 | if (sa != NULL) | |
434 | FREE(sa, M_SONAME); | |
435 | } | |
436 | ||
437 | errno_t | |
438 | sock_getsockopt(socket_t sock, int level, int optname, void *optval, | |
439 | int *optlen) | |
440 | { | |
441 | int error = 0; | |
442 | struct sockopt sopt; | |
443 | ||
444 | if (sock == NULL || optval == NULL || optlen == NULL) | |
445 | return (EINVAL); | |
446 | ||
447 | sopt.sopt_dir = SOPT_GET; | |
448 | sopt.sopt_level = level; | |
449 | sopt.sopt_name = optname; | |
450 | sopt.sopt_val = CAST_USER_ADDR_T(optval); | |
451 | sopt.sopt_valsize = *optlen; | |
452 | sopt.sopt_p = kernproc; | |
453 | error = sogetoptlock(sock, &sopt, 1); /* will lock socket */ | |
454 | if (error == 0) | |
455 | *optlen = sopt.sopt_valsize; | |
456 | return (error); | |
457 | } | |
458 | ||
459 | errno_t | |
460 | sock_ioctl(socket_t sock, unsigned long request, void *argp) | |
461 | { | |
462 | return (soioctl(sock, request, argp, kernproc)); /* will lock socket */ | |
463 | } | |
464 | ||
465 | errno_t | |
466 | sock_setsockopt(socket_t sock, int level, int optname, const void *optval, | |
467 | int optlen) | |
468 | { | |
469 | struct sockopt sopt; | |
470 | ||
471 | if (sock == NULL || optval == NULL) | |
472 | return (EINVAL); | |
473 | ||
474 | sopt.sopt_dir = SOPT_SET; | |
475 | sopt.sopt_level = level; | |
476 | sopt.sopt_name = optname; | |
477 | sopt.sopt_val = CAST_USER_ADDR_T(optval); | |
478 | sopt.sopt_valsize = optlen; | |
479 | sopt.sopt_p = kernproc; | |
480 | return (sosetoptlock(sock, &sopt, 1)); /* will lock socket */ | |
481 | } | |
482 | ||
483 | /* | |
484 | * This follows the recommended mappings between DSCP code points | |
485 | * and WMM access classes. | |
486 | */ | |
487 | static u_int32_t so_tc_from_dscp(u_int8_t dscp); | |
488 | static u_int32_t | |
489 | so_tc_from_dscp(u_int8_t dscp) | |
490 | { | |
491 | u_int32_t tc; | |
492 | ||
493 | if (dscp >= 0x30 && dscp <= 0x3f) | |
494 | tc = SO_TC_VO; | |
495 | else if (dscp >= 0x20 && dscp <= 0x2f) | |
496 | tc = SO_TC_VI; | |
497 | else if (dscp >= 0x08 && dscp <= 0x17) | |
498 | tc = SO_TC_BK; | |
499 | else | |
500 | tc = SO_TC_BE; | |
501 | ||
502 | return (tc); | |
503 | } | |
504 | ||
505 | errno_t | |
506 | sock_settclassopt(socket_t sock, const void *optval, size_t optlen) | |
507 | { | |
508 | errno_t error = 0; | |
509 | struct sockopt sopt; | |
510 | int sotc; | |
511 | ||
512 | if (sock == NULL || optval == NULL || optlen != sizeof (int)) | |
513 | return (EINVAL); | |
514 | ||
515 | socket_lock(sock, 1); | |
516 | if (!(sock->so_state & SS_ISCONNECTED)) { | |
517 | /* | |
518 | * If the socket is not connected then we don't know | |
519 | * if the destination is on LAN or not. Skip | |
520 | * setting traffic class in this case | |
521 | */ | |
522 | error = ENOTCONN; | |
523 | goto out; | |
524 | } | |
525 | ||
526 | if (sock->so_proto == NULL || sock->so_proto->pr_domain == NULL || | |
527 | sock->so_pcb == NULL) { | |
528 | error = EINVAL; | |
529 | goto out; | |
530 | } | |
531 | ||
532 | /* | |
533 | * Set the socket traffic class based on the passed DSCP code point | |
534 | * regardless of the scope of the destination | |
535 | */ | |
536 | sotc = so_tc_from_dscp((*(const int *)optval) >> 2); | |
537 | ||
538 | sopt.sopt_dir = SOPT_SET; | |
539 | sopt.sopt_val = CAST_USER_ADDR_T(&sotc); | |
540 | sopt.sopt_valsize = sizeof (sotc); | |
541 | sopt.sopt_p = kernproc; | |
542 | sopt.sopt_level = SOL_SOCKET; | |
543 | sopt.sopt_name = SO_TRAFFIC_CLASS; | |
544 | ||
545 | error = sosetoptlock(sock, &sopt, 0); /* already locked */ | |
546 | ||
547 | if (error != 0) { | |
548 | printf("%s: sosetopt SO_TRAFFIC_CLASS failed %d\n", | |
549 | __func__, error); | |
550 | goto out; | |
551 | } | |
552 | ||
553 | /* | |
554 | * Check if the destination address is LAN or link local address. | |
555 | * We do not want to set traffic class bits if the destination | |
556 | * is not local. | |
557 | */ | |
558 | if (!so_isdstlocal(sock)) | |
559 | goto out; | |
560 | ||
561 | sopt.sopt_dir = SOPT_SET; | |
562 | sopt.sopt_val = CAST_USER_ADDR_T(optval); | |
563 | sopt.sopt_valsize = optlen; | |
564 | sopt.sopt_p = kernproc; | |
565 | ||
566 | switch (SOCK_DOM(sock)) { | |
567 | case PF_INET: | |
568 | sopt.sopt_level = IPPROTO_IP; | |
569 | sopt.sopt_name = IP_TOS; | |
570 | break; | |
571 | case PF_INET6: | |
572 | sopt.sopt_level = IPPROTO_IPV6; | |
573 | sopt.sopt_name = IPV6_TCLASS; | |
574 | break; | |
575 | default: | |
576 | error = EINVAL; | |
577 | goto out; | |
578 | } | |
579 | ||
580 | error = sosetoptlock(sock, &sopt, 0); /* already locked */ | |
581 | socket_unlock(sock, 1); | |
582 | return (error); | |
583 | out: | |
584 | socket_unlock(sock, 1); | |
585 | return (error); | |
586 | } | |
587 | ||
588 | errno_t | |
589 | sock_gettclassopt(socket_t sock, void *optval, size_t *optlen) | |
590 | { | |
591 | errno_t error = 0; | |
592 | struct sockopt sopt; | |
593 | ||
594 | if (sock == NULL || optval == NULL || optlen == NULL) | |
595 | return (EINVAL); | |
596 | ||
597 | sopt.sopt_dir = SOPT_GET; | |
598 | sopt.sopt_val = CAST_USER_ADDR_T(optval); | |
599 | sopt.sopt_valsize = *optlen; | |
600 | sopt.sopt_p = kernproc; | |
601 | ||
602 | socket_lock(sock, 1); | |
603 | if (sock->so_proto == NULL || sock->so_proto->pr_domain == NULL) { | |
604 | socket_unlock(sock, 1); | |
605 | return (EINVAL); | |
606 | } | |
607 | ||
608 | switch (SOCK_DOM(sock)) { | |
609 | case PF_INET: | |
610 | sopt.sopt_level = IPPROTO_IP; | |
611 | sopt.sopt_name = IP_TOS; | |
612 | break; | |
613 | case PF_INET6: | |
614 | sopt.sopt_level = IPPROTO_IPV6; | |
615 | sopt.sopt_name = IPV6_TCLASS; | |
616 | break; | |
617 | default: | |
618 | socket_unlock(sock, 1); | |
619 | return (EINVAL); | |
620 | ||
621 | } | |
622 | error = sogetoptlock(sock, &sopt, 0); /* already locked */ | |
623 | socket_unlock(sock, 1); | |
624 | if (error == 0) | |
625 | *optlen = sopt.sopt_valsize; | |
626 | return (error); | |
627 | } | |
628 | ||
629 | errno_t | |
630 | sock_listen(socket_t sock, int backlog) | |
631 | { | |
632 | if (sock == NULL) | |
633 | return (EINVAL); | |
634 | ||
635 | return (solisten(sock, backlog)); /* will lock socket */ | |
636 | } | |
637 | ||
638 | errno_t | |
639 | sock_receive_internal(socket_t sock, struct msghdr *msg, mbuf_t *data, | |
640 | int flags, size_t *recvdlen) | |
641 | { | |
642 | uio_t auio; | |
643 | struct mbuf *control = NULL; | |
644 | int error = 0; | |
645 | int length = 0; | |
646 | struct sockaddr *fromsa = NULL; | |
647 | char uio_buf[ UIO_SIZEOF((msg != NULL) ? msg->msg_iovlen : 0) ]; | |
648 | ||
649 | if (sock == NULL) | |
650 | return (EINVAL); | |
651 | ||
652 | auio = uio_createwithbuffer(((msg != NULL) ? msg->msg_iovlen : 0), | |
653 | 0, UIO_SYSSPACE, UIO_READ, &uio_buf[0], sizeof (uio_buf)); | |
654 | if (msg != NULL && data == NULL) { | |
655 | int i; | |
656 | struct iovec *tempp = msg->msg_iov; | |
657 | ||
658 | for (i = 0; i < msg->msg_iovlen; i++) { | |
659 | uio_addiov(auio, | |
660 | CAST_USER_ADDR_T((tempp + i)->iov_base), | |
661 | (tempp + i)->iov_len); | |
662 | } | |
663 | if (uio_resid(auio) < 0) | |
664 | return (EINVAL); | |
665 | } else if (recvdlen != NULL) { | |
666 | uio_setresid(auio, (uio_resid(auio) + *recvdlen)); | |
667 | } | |
668 | length = uio_resid(auio); | |
669 | ||
670 | if (recvdlen != NULL) | |
671 | *recvdlen = 0; | |
672 | ||
673 | /* let pru_soreceive handle the socket locking */ | |
674 | error = sock->so_proto->pr_usrreqs->pru_soreceive(sock, &fromsa, auio, | |
675 | data, (msg && msg->msg_control) ? &control : NULL, &flags); | |
676 | if (error != 0) | |
677 | goto cleanup; | |
678 | ||
679 | if (recvdlen != NULL) | |
680 | *recvdlen = length - uio_resid(auio); | |
681 | if (msg != NULL) { | |
682 | msg->msg_flags = flags; | |
683 | ||
684 | if (msg->msg_name != NULL) { | |
685 | int salen; | |
686 | salen = msg->msg_namelen; | |
687 | if (msg->msg_namelen > 0 && fromsa != NULL) { | |
688 | salen = MIN(salen, fromsa->sa_len); | |
689 | memcpy(msg->msg_name, fromsa, | |
690 | msg->msg_namelen > fromsa->sa_len ? | |
691 | fromsa->sa_len : msg->msg_namelen); | |
692 | } | |
693 | } | |
694 | ||
695 | if (msg->msg_control != NULL) { | |
696 | struct mbuf *m = control; | |
697 | u_char *ctlbuf = msg->msg_control; | |
698 | int clen = msg->msg_controllen; | |
699 | ||
700 | msg->msg_controllen = 0; | |
701 | ||
702 | while (m != NULL && clen > 0) { | |
703 | unsigned int tocopy; | |
704 | ||
705 | if (clen >= m->m_len) { | |
706 | tocopy = m->m_len; | |
707 | } else { | |
708 | msg->msg_flags |= MSG_CTRUNC; | |
709 | tocopy = clen; | |
710 | } | |
711 | memcpy(ctlbuf, mtod(m, caddr_t), tocopy); | |
712 | ctlbuf += tocopy; | |
713 | clen -= tocopy; | |
714 | m = m->m_next; | |
715 | } | |
716 | msg->msg_controllen = | |
717 | (uintptr_t)ctlbuf - (uintptr_t)msg->msg_control; | |
718 | } | |
719 | } | |
720 | ||
721 | cleanup: | |
722 | if (control != NULL) | |
723 | m_freem(control); | |
724 | if (fromsa != NULL) | |
725 | FREE(fromsa, M_SONAME); | |
726 | return (error); | |
727 | } | |
728 | ||
729 | errno_t | |
730 | sock_receive(socket_t sock, struct msghdr *msg, int flags, size_t *recvdlen) | |
731 | { | |
732 | if ((msg == NULL) || (msg->msg_iovlen < 1) || | |
733 | (msg->msg_iov[0].iov_len == 0) || | |
734 | (msg->msg_iov[0].iov_base == NULL)) | |
735 | return (EINVAL); | |
736 | ||
737 | return (sock_receive_internal(sock, msg, NULL, flags, recvdlen)); | |
738 | } | |
739 | ||
740 | errno_t | |
741 | sock_receivembuf(socket_t sock, struct msghdr *msg, mbuf_t *data, int flags, | |
742 | size_t *recvlen) | |
743 | { | |
744 | if (data == NULL || recvlen == 0 || *recvlen <= 0 || (msg != NULL && | |
745 | (msg->msg_iov != NULL || msg->msg_iovlen != 0))) | |
746 | return (EINVAL); | |
747 | ||
748 | return (sock_receive_internal(sock, msg, data, flags, recvlen)); | |
749 | } | |
750 | ||
751 | errno_t | |
752 | sock_send_internal(socket_t sock, const struct msghdr *msg, mbuf_t data, | |
753 | int flags, size_t *sentlen) | |
754 | { | |
755 | uio_t auio = NULL; | |
756 | struct mbuf *control = NULL; | |
757 | int error = 0; | |
758 | int datalen = 0; | |
759 | char uio_buf[ UIO_SIZEOF((msg != NULL ? msg->msg_iovlen : 1)) ]; | |
760 | ||
761 | if (sock == NULL) { | |
762 | error = EINVAL; | |
763 | goto errorout; | |
764 | } | |
765 | ||
766 | if (data == NULL && msg != NULL) { | |
767 | struct iovec *tempp = msg->msg_iov; | |
768 | ||
769 | auio = uio_createwithbuffer(msg->msg_iovlen, 0, | |
770 | UIO_SYSSPACE, UIO_WRITE, &uio_buf[0], sizeof (uio_buf)); | |
771 | if (tempp != NULL) { | |
772 | int i; | |
773 | ||
774 | for (i = 0; i < msg->msg_iovlen; i++) { | |
775 | uio_addiov(auio, | |
776 | CAST_USER_ADDR_T((tempp + i)->iov_base), | |
777 | (tempp + i)->iov_len); | |
778 | } | |
779 | ||
780 | if (uio_resid(auio) < 0) { | |
781 | error = EINVAL; | |
782 | goto errorout; | |
783 | } | |
784 | } | |
785 | } | |
786 | ||
787 | if (sentlen != NULL) | |
788 | *sentlen = 0; | |
789 | ||
790 | if (auio != NULL) | |
791 | datalen = uio_resid(auio); | |
792 | else | |
793 | datalen = data->m_pkthdr.len; | |
794 | ||
795 | if (msg != NULL && msg->msg_control) { | |
796 | if ((size_t)msg->msg_controllen < sizeof (struct cmsghdr)) { | |
797 | error = EINVAL; | |
798 | goto errorout; | |
799 | } | |
800 | ||
801 | if ((size_t)msg->msg_controllen > MLEN) { | |
802 | error = EINVAL; | |
803 | goto errorout; | |
804 | } | |
805 | ||
806 | control = m_get(M_NOWAIT, MT_CONTROL); | |
807 | if (control == NULL) { | |
808 | error = ENOMEM; | |
809 | goto errorout; | |
810 | } | |
811 | memcpy(mtod(control, caddr_t), msg->msg_control, | |
812 | msg->msg_controllen); | |
813 | control->m_len = msg->msg_controllen; | |
814 | } | |
815 | ||
816 | error = sock->so_proto->pr_usrreqs->pru_sosend(sock, msg != NULL ? | |
817 | (struct sockaddr *)msg->msg_name : NULL, auio, data, | |
818 | control, flags); | |
819 | ||
820 | /* | |
821 | * Residual data is possible in the case of IO vectors but not | |
822 | * in the mbuf case since the latter is treated as atomic send. | |
823 | * If pru_sosend() consumed a portion of the iovecs data and | |
824 | * the error returned is transient, treat it as success; this | |
825 | * is consistent with sendit() behavior. | |
826 | */ | |
827 | if (auio != NULL && uio_resid(auio) != datalen && | |
828 | (error == ERESTART || error == EINTR || error == EWOULDBLOCK)) | |
829 | error = 0; | |
830 | ||
831 | if (error == 0 && sentlen != NULL) { | |
832 | if (auio != NULL) | |
833 | *sentlen = datalen - uio_resid(auio); | |
834 | else | |
835 | *sentlen = datalen; | |
836 | } | |
837 | ||
838 | return (error); | |
839 | ||
840 | /* | |
841 | * In cases where we detect an error before returning, we need to | |
842 | * free the mbuf chain if there is one. sosend (and pru_sosend) will | |
843 | * free the mbuf chain if they encounter an error. | |
844 | */ | |
845 | errorout: | |
846 | if (control) | |
847 | m_freem(control); | |
848 | if (data) | |
849 | m_freem(data); | |
850 | if (sentlen) | |
851 | *sentlen = 0; | |
852 | return (error); | |
853 | } | |
854 | ||
855 | errno_t | |
856 | sock_send(socket_t sock, const struct msghdr *msg, int flags, size_t *sentlen) | |
857 | { | |
858 | if (msg == NULL || msg->msg_iov == NULL || msg->msg_iovlen < 1) | |
859 | return (EINVAL); | |
860 | ||
861 | return (sock_send_internal(sock, msg, NULL, flags, sentlen)); | |
862 | } | |
863 | ||
864 | errno_t | |
865 | sock_sendmbuf(socket_t sock, const struct msghdr *msg, mbuf_t data, | |
866 | int flags, size_t *sentlen) | |
867 | { | |
868 | if (data == NULL || (msg != NULL && (msg->msg_iov != NULL || | |
869 | msg->msg_iovlen != 0))) { | |
870 | if (data != NULL) | |
871 | m_freem(data); | |
872 | return (EINVAL); | |
873 | } | |
874 | return (sock_send_internal(sock, msg, data, flags, sentlen)); | |
875 | } | |
876 | ||
877 | errno_t | |
878 | sock_shutdown(socket_t sock, int how) | |
879 | { | |
880 | if (sock == NULL) | |
881 | return (EINVAL); | |
882 | ||
883 | return (soshutdown(sock, how)); | |
884 | } | |
885 | ||
886 | ||
887 | errno_t | |
888 | sock_socket(int domain, int type, int protocol, sock_upcall callback, | |
889 | void *context, socket_t *new_so) | |
890 | { | |
891 | int error = 0; | |
892 | ||
893 | if (new_so == NULL) | |
894 | return (EINVAL); | |
895 | ||
896 | /* socreate will create an initial so_count */ | |
897 | error = socreate(domain, new_so, type, protocol); | |
898 | if (error == 0) { | |
899 | /* see comments in sock_setupcall() */ | |
900 | if (callback != NULL) { | |
901 | sock_setupcalls_common(*new_so, callback, context, | |
902 | NULL, NULL); | |
903 | } | |
904 | /* | |
905 | * last_pid and last_upid should be zero for sockets | |
906 | * created using sock_socket | |
907 | */ | |
908 | (*new_so)->last_pid = 0; | |
909 | (*new_so)->last_upid = 0; | |
910 | } | |
911 | return (error); | |
912 | } | |
913 | ||
914 | void | |
915 | sock_close(socket_t sock) | |
916 | { | |
917 | if (sock == NULL) | |
918 | return; | |
919 | ||
920 | soclose(sock); | |
921 | } | |
922 | ||
923 | /* Do we want this to be APPLE_PRIVATE API?: YES (LD 12/23/04) */ | |
924 | void | |
925 | sock_retain(socket_t sock) | |
926 | { | |
927 | if (sock == NULL) | |
928 | return; | |
929 | ||
930 | socket_lock(sock, 1); | |
931 | sock->so_retaincnt++; | |
932 | sock->so_usecount++; /* add extra reference for holding the socket */ | |
933 | socket_unlock(sock, 1); | |
934 | } | |
935 | ||
936 | /* Do we want this to be APPLE_PRIVATE API? */ | |
937 | void | |
938 | sock_release(socket_t sock) | |
939 | { | |
940 | if (sock == NULL) | |
941 | return; | |
942 | ||
943 | socket_lock(sock, 1); | |
944 | if (sock->so_upcallusecount > 0) | |
945 | soclose_wait_locked(sock); | |
946 | ||
947 | sock->so_retaincnt--; | |
948 | if (sock->so_retaincnt < 0) { | |
949 | panic("%s: negative retain count (%d) for sock=%p\n", | |
950 | __func__, sock->so_retaincnt, sock); | |
951 | /* NOTREACHED */ | |
952 | } | |
953 | /* | |
954 | * Check SS_NOFDREF in case a close happened as sock_retain() | |
955 | * was grabbing the lock | |
956 | */ | |
957 | if ((sock->so_retaincnt == 0) && (sock->so_usecount == 2) && | |
958 | (!(sock->so_state & SS_NOFDREF) || | |
959 | (sock->so_flags & SOF_MP_SUBFLOW))) { | |
960 | /* close socket only if the FD is not holding it */ | |
961 | soclose_locked(sock); | |
962 | } else { | |
963 | /* remove extra reference holding the socket */ | |
964 | sock->so_usecount--; | |
965 | } | |
966 | socket_unlock(sock, 1); | |
967 | } | |
968 | ||
969 | errno_t | |
970 | sock_setpriv(socket_t sock, int on) | |
971 | { | |
972 | if (sock == NULL) | |
973 | return (EINVAL); | |
974 | ||
975 | socket_lock(sock, 1); | |
976 | if (on) | |
977 | sock->so_state |= SS_PRIV; | |
978 | else | |
979 | sock->so_state &= ~SS_PRIV; | |
980 | socket_unlock(sock, 1); | |
981 | return (0); | |
982 | } | |
983 | ||
984 | int | |
985 | sock_isconnected(socket_t sock) | |
986 | { | |
987 | int retval; | |
988 | ||
989 | socket_lock(sock, 1); | |
990 | retval = ((sock->so_state & SS_ISCONNECTED) ? 1 : 0); | |
991 | socket_unlock(sock, 1); | |
992 | return (retval); | |
993 | } | |
994 | ||
995 | int | |
996 | sock_isnonblocking(socket_t sock) | |
997 | { | |
998 | int retval; | |
999 | ||
1000 | socket_lock(sock, 1); | |
1001 | retval = ((sock->so_state & SS_NBIO) ? 1 : 0); | |
1002 | socket_unlock(sock, 1); | |
1003 | return (retval); | |
1004 | } | |
1005 | ||
1006 | errno_t | |
1007 | sock_gettype(socket_t sock, int *outDomain, int *outType, int *outProtocol) | |
1008 | { | |
1009 | socket_lock(sock, 1); | |
1010 | if (outDomain != NULL) | |
1011 | *outDomain = SOCK_DOM(sock); | |
1012 | if (outType != NULL) | |
1013 | *outType = sock->so_type; | |
1014 | if (outProtocol != NULL) | |
1015 | *outProtocol = SOCK_PROTO(sock); | |
1016 | socket_unlock(sock, 1); | |
1017 | return (0); | |
1018 | } | |
1019 | ||
1020 | /* | |
1021 | * Return the listening socket of a pre-accepted socket. It returns the | |
1022 | * listener (so_head) value of a given socket. This is intended to be | |
1023 | * called by a socket filter during a filter attach (sf_attach) callback. | |
1024 | * The value returned by this routine is safe to be used only in the | |
1025 | * context of that callback, because we hold the listener's lock across | |
1026 | * the sflt_initsock() call. | |
1027 | */ | |
1028 | socket_t | |
1029 | sock_getlistener(socket_t sock) | |
1030 | { | |
1031 | return (sock->so_head); | |
1032 | } | |
1033 | ||
1034 | static inline void | |
1035 | sock_set_tcp_stream_priority(socket_t sock) | |
1036 | { | |
1037 | if ((SOCK_DOM(sock) == PF_INET || SOCK_DOM(sock) == PF_INET6) && | |
1038 | SOCK_TYPE(sock) == SOCK_STREAM) { | |
1039 | set_tcp_stream_priority(sock); | |
1040 | } | |
1041 | } | |
1042 | ||
1043 | /* | |
1044 | * Caller must have ensured socket is valid and won't be going away. | |
1045 | */ | |
1046 | void | |
1047 | socket_set_traffic_mgt_flags_locked(socket_t sock, u_int8_t flags) | |
1048 | { | |
1049 | (void) OSBitOrAtomic8(flags, &sock->so_traffic_mgt_flags); | |
1050 | sock_set_tcp_stream_priority(sock); | |
1051 | } | |
1052 | ||
1053 | void | |
1054 | socket_set_traffic_mgt_flags(socket_t sock, u_int8_t flags) | |
1055 | { | |
1056 | socket_lock(sock, 1); | |
1057 | socket_set_traffic_mgt_flags_locked(sock, flags); | |
1058 | socket_unlock(sock, 1); | |
1059 | } | |
1060 | ||
1061 | /* | |
1062 | * Caller must have ensured socket is valid and won't be going away. | |
1063 | */ | |
1064 | void | |
1065 | socket_clear_traffic_mgt_flags_locked(socket_t sock, u_int8_t flags) | |
1066 | { | |
1067 | (void) OSBitAndAtomic8(~flags, &sock->so_traffic_mgt_flags); | |
1068 | sock_set_tcp_stream_priority(sock); | |
1069 | } | |
1070 | ||
1071 | void | |
1072 | socket_clear_traffic_mgt_flags(socket_t sock, u_int8_t flags) | |
1073 | { | |
1074 | socket_lock(sock, 1); | |
1075 | socket_clear_traffic_mgt_flags_locked(sock, flags); | |
1076 | socket_unlock(sock, 1); | |
1077 | } | |
1078 | ||
1079 | ||
1080 | /* | |
1081 | * Caller must have ensured socket is valid and won't be going away. | |
1082 | */ | |
1083 | errno_t | |
1084 | socket_defunct(struct proc *p, socket_t so, int level) | |
1085 | { | |
1086 | errno_t retval; | |
1087 | ||
1088 | if (level != SHUTDOWN_SOCKET_LEVEL_DISCONNECT_SVC && | |
1089 | level != SHUTDOWN_SOCKET_LEVEL_DISCONNECT_ALL) | |
1090 | return (EINVAL); | |
1091 | ||
1092 | socket_lock(so, 1); | |
1093 | /* | |
1094 | * SHUTDOWN_SOCKET_LEVEL_DISCONNECT_SVC level is meant to tear down | |
1095 | * all of mDNSResponder IPC sockets, currently those of AF_UNIX; note | |
1096 | * that this is an implementation artifact of mDNSResponder. We do | |
1097 | * a quick test against the socket buffers for SB_UNIX, since that | |
1098 | * would have been set by unp_attach() at socket creation time. | |
1099 | */ | |
1100 | if (level == SHUTDOWN_SOCKET_LEVEL_DISCONNECT_SVC && | |
1101 | (so->so_rcv.sb_flags & so->so_snd.sb_flags & SB_UNIX) != SB_UNIX) { | |
1102 | socket_unlock(so, 1); | |
1103 | return (EOPNOTSUPP); | |
1104 | } | |
1105 | retval = sosetdefunct(p, so, level, TRUE); | |
1106 | if (retval == 0) | |
1107 | retval = sodefunct(p, so, level); | |
1108 | socket_unlock(so, 1); | |
1109 | return (retval); | |
1110 | } | |
1111 | ||
1112 | static void | |
1113 | sock_setupcalls_common(socket_t sock, sock_upcall rcallback, void *rcontext, | |
1114 | sock_upcall wcallback, void *wcontext) | |
1115 | { | |
1116 | if (rcallback != NULL) { | |
1117 | sock->so_rcv.sb_flags |= SB_UPCALL; | |
1118 | sock->so_rcv.sb_upcall = rcallback; | |
1119 | sock->so_rcv.sb_upcallarg = rcontext; | |
1120 | } else { | |
1121 | sock->so_rcv.sb_flags &= ~SB_UPCALL; | |
1122 | sock->so_rcv.sb_upcall = NULL; | |
1123 | sock->so_rcv.sb_upcallarg = NULL; | |
1124 | } | |
1125 | ||
1126 | if (wcallback != NULL) { | |
1127 | sock->so_snd.sb_flags |= SB_UPCALL; | |
1128 | sock->so_snd.sb_upcall = wcallback; | |
1129 | sock->so_snd.sb_upcallarg = wcontext; | |
1130 | } else { | |
1131 | sock->so_snd.sb_flags &= ~SB_UPCALL; | |
1132 | sock->so_snd.sb_upcall = NULL; | |
1133 | sock->so_snd.sb_upcallarg = NULL; | |
1134 | } | |
1135 | } | |
1136 | ||
1137 | errno_t | |
1138 | sock_setupcall(socket_t sock, sock_upcall callback, void *context) | |
1139 | { | |
1140 | if (sock == NULL) | |
1141 | return (EINVAL); | |
1142 | ||
1143 | /* | |
1144 | * Note that we don't wait for any in progress upcall to complete. | |
1145 | * On embedded, sock_setupcall() causes both read and write | |
1146 | * callbacks to be set; on desktop, only read callback is set | |
1147 | * to maintain legacy KPI behavior. | |
1148 | * | |
1149 | * The newer sock_setupcalls() KPI should be used instead to set | |
1150 | * the read and write callbacks and their respective parameters. | |
1151 | */ | |
1152 | socket_lock(sock, 1); | |
1153 | sock_setupcalls_common(sock, callback, context, NULL, NULL); | |
1154 | socket_unlock(sock, 1); | |
1155 | ||
1156 | return (0); | |
1157 | } | |
1158 | ||
1159 | errno_t | |
1160 | sock_setupcalls(socket_t sock, sock_upcall rcallback, void *rcontext, | |
1161 | sock_upcall wcallback, void *wcontext) | |
1162 | { | |
1163 | if (sock == NULL) | |
1164 | return (EINVAL); | |
1165 | ||
1166 | /* | |
1167 | * Note that we don't wait for any in progress upcall to complete. | |
1168 | */ | |
1169 | socket_lock(sock, 1); | |
1170 | sock_setupcalls_common(sock, rcallback, rcontext, wcallback, wcontext); | |
1171 | socket_unlock(sock, 1); | |
1172 | ||
1173 | return (0); | |
1174 | } | |
1175 | ||
1176 | errno_t | |
1177 | sock_catchevents(socket_t sock, sock_evupcall ecallback, void *econtext, | |
1178 | u_int32_t emask) | |
1179 | { | |
1180 | if (sock == NULL) | |
1181 | return (EINVAL); | |
1182 | ||
1183 | /* | |
1184 | * Note that we don't wait for any in progress upcall to complete. | |
1185 | */ | |
1186 | socket_lock(sock, 1); | |
1187 | if (ecallback != NULL) { | |
1188 | sock->so_event = ecallback; | |
1189 | sock->so_eventarg = econtext; | |
1190 | sock->so_eventmask = emask; | |
1191 | } else { | |
1192 | sock->so_event = sonullevent; | |
1193 | sock->so_eventarg = NULL; | |
1194 | sock->so_eventmask = 0; | |
1195 | } | |
1196 | socket_unlock(sock, 1); | |
1197 | ||
1198 | return (0); | |
1199 | } | |
1200 | ||
1201 | /* | |
1202 | * Returns true whether or not a socket belongs to the kernel. | |
1203 | */ | |
1204 | int | |
1205 | sock_iskernel(socket_t so) | |
1206 | { | |
1207 | return (so && so->last_pid == 0); | |
1208 | } |