FreeBSD/Linux Kernel Cross Reference
sys/sys/socketvar.h
1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1982, 1986, 1990, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)socketvar.h 8.3 (Berkeley) 2/19/95
32 *
33 * $FreeBSD$
34 */
35
36 #ifndef _SYS_SOCKETVAR_H_
37 #define _SYS_SOCKETVAR_H_
38
39 /*
40 * Socket generation count type. Also used in xinpcb, xtcpcb, xunpcb.
41 */
42 typedef uint64_t so_gen_t;
43
44 #if defined(_KERNEL) || defined(_WANT_SOCKET)
45 #include <sys/queue.h> /* for TAILQ macros */
46 #include <sys/selinfo.h> /* for struct selinfo */
47 #include <sys/_lock.h>
48 #include <sys/_mutex.h>
49 #include <sys/osd.h>
50 #include <sys/_sx.h>
51 #include <sys/sockbuf.h>
52 #ifdef _KERNEL
53 #include <sys/caprights.h>
54 #include <sys/sockopt.h>
55 #endif
56
57 struct vnet;
58
59 /*
60 * Kernel structure per socket.
61 * Contains send and receive buffer queues,
62 * handle on protocol and pointer to protocol
63 * private data and error information.
64 */
65 typedef int so_upcall_t(struct socket *, void *, int);
66 typedef void so_dtor_t(struct socket *);
67
68 struct socket;
69
70 enum socket_qstate {
71 SQ_NONE = 0,
72 SQ_INCOMP = 0x0800, /* on sol_incomp */
73 SQ_COMP = 0x1000, /* on sol_comp */
74 };
75
76 /*-
77 * Locking key to struct socket:
78 * (a) constant after allocation, no locking required.
79 * (b) locked by SOCK_LOCK(so).
80 * (cr) locked by SOCK_RECVBUF_LOCK(so)
81 * (cs) locked by SOCK_SENDBUF_LOCK(so)
82 * (e) locked by SOLISTEN_LOCK() of corresponding listening socket.
83 * (f) not locked since integer reads/writes are atomic.
84 * (g) used only as a sleep/wakeup address, no value.
85 * (h) locked by global mutex so_global_mtx.
86 * (k) locked by KTLS workqueue mutex
87 */
88 TAILQ_HEAD(accept_queue, socket);
89 struct socket {
90 struct mtx so_lock;
91 volatile u_int so_count; /* (b / refcount) */
92 struct selinfo so_rdsel; /* (b/cr) for so_rcv/so_comp */
93 struct selinfo so_wrsel; /* (b/cs) for so_snd */
94 int so_options; /* (b) from socket call, see socket.h */
95 short so_type; /* (a) generic type, see socket.h */
96 short so_state; /* (b) internal state flags SS_* */
97 void *so_pcb; /* protocol control block */
98 struct vnet *so_vnet; /* (a) network stack instance */
99 struct protosw *so_proto; /* (a) protocol handle */
100 short so_linger; /* time to linger close(2) */
101 short so_timeo; /* (g) connection timeout */
102 u_short so_error; /* (f) error affecting connection */
103 u_short so_rerror; /* (f) error affecting connection */
104 struct sigio *so_sigio; /* [sg] information for async I/O or
105 out of band data (SIGURG) */
106 struct ucred *so_cred; /* (a) user credentials */
107 struct label *so_label; /* (b) MAC label for socket */
108 /* NB: generation count must not be first. */
109 so_gen_t so_gencnt; /* (h) generation count */
110 void *so_emuldata; /* (b) private data for emulators */
111 so_dtor_t *so_dtor; /* (b) optional destructor */
112 struct osd osd; /* Object Specific extensions */
113 /*
114 * so_fibnum, so_user_cookie and friends can be used to attach
115 * some user-specified metadata to a socket, which then can be
116 * used by the kernel for various actions.
117 * so_user_cookie is used by ipfw/dummynet.
118 */
119 int so_fibnum; /* routing domain for this socket */
120 uint32_t so_user_cookie;
121
122 int so_ts_clock; /* type of the clock used for timestamps */
123 uint32_t so_max_pacing_rate; /* (f) TX rate limit in bytes/s */
124
125 /*
126 * Mutexes to prevent interleaving of socket I/O. These have to be
127 * outside of the socket buffers in order to interlock with listen(2).
128 */
129 struct sx so_snd_sx __aligned(CACHE_LINE_SIZE);
130 struct mtx so_snd_mtx;
131
132 struct sx so_rcv_sx __aligned(CACHE_LINE_SIZE);
133 struct mtx so_rcv_mtx;
134
135 union {
136 /* Regular (data flow) socket. */
137 struct {
138 /* (cr, cs) Receive and send buffers. */
139 struct sockbuf so_rcv, so_snd;
140
141 /* (e) Our place on accept queue. */
142 TAILQ_ENTRY(socket) so_list;
143 struct socket *so_listen; /* (b) */
144 enum socket_qstate so_qstate; /* (b) */
145 /* (b) cached MAC label for peer */
146 struct label *so_peerlabel;
147 u_long so_oobmark; /* chars to oob mark */
148
149 /* (k) Our place on KTLS RX work queue. */
150 STAILQ_ENTRY(socket) so_ktls_rx_list;
151 };
152 /*
153 * Listening socket, where accepts occur, is so_listen in all
154 * subsidiary sockets. If so_listen is NULL, socket is not
155 * related to an accept. For a listening socket itself
156 * sol_incomp queues partially completed connections, while
157 * sol_comp is a queue of connections ready to be accepted.
158 * If a connection is aborted and it has so_listen set, then
159 * it has to be pulled out of either sol_incomp or sol_comp.
160 * We allow connections to queue up based on current queue
161 * lengths and limit on number of queued connections for this
162 * socket.
163 */
164 struct {
165 /* (e) queue of partial unaccepted connections */
166 struct accept_queue sol_incomp;
167 /* (e) queue of complete unaccepted connections */
168 struct accept_queue sol_comp;
169 u_int sol_qlen; /* (e) sol_comp length */
170 u_int sol_incqlen; /* (e) sol_incomp length */
171 u_int sol_qlimit; /* (e) queue limit */
172
173 /* accept_filter(9) optional data */
174 struct accept_filter *sol_accept_filter;
175 void *sol_accept_filter_arg; /* saved filter args */
176 char *sol_accept_filter_str; /* saved user args */
177
178 /* Optional upcall, for kernel socket. */
179 so_upcall_t *sol_upcall; /* (e) */
180 void *sol_upcallarg; /* (e) */
181
182 /* Socket buffer parameters, to be copied to
183 * dataflow sockets, accepted from this one. */
184 int sol_sbrcv_lowat;
185 int sol_sbsnd_lowat;
186 u_int sol_sbrcv_hiwat;
187 u_int sol_sbsnd_hiwat;
188 short sol_sbrcv_flags;
189 short sol_sbsnd_flags;
190 sbintime_t sol_sbrcv_timeo;
191 sbintime_t sol_sbsnd_timeo;
192
193 /* Information tracking listen queue overflows. */
194 struct timeval sol_lastover; /* (e) */
195 int sol_overcount; /* (e) */
196 };
197 };
198 };
199 #endif /* defined(_KERNEL) || defined(_WANT_SOCKET) */
200
201 /*
202 * Socket state bits.
203 *
204 * Historically, these bits were all kept in the so_state field.
205 * They are now split into separate, lock-specific fields.
206 * so_state maintains basic socket state protected by the socket lock.
207 * so_qstate holds information about the socket accept queues.
208 * Each socket buffer also has a state field holding information
209 * relevant to that socket buffer (can't send, rcv).
210 * Many fields will be read without locks to improve performance and avoid
211 * lock order issues. However, this approach must be used with caution.
212 */
213 #define SS_ISCONNECTED 0x0002 /* socket connected to a peer */
214 #define SS_ISCONNECTING 0x0004 /* in process of connecting to peer */
215 #define SS_ISDISCONNECTING 0x0008 /* in process of disconnecting */
216 #define SS_NBIO 0x0100 /* non-blocking ops */
217 #define SS_ASYNC 0x0200 /* async i/o notify */
218 #define SS_ISCONFIRMING 0x0400 /* deciding to accept connection req */
219 #define SS_ISDISCONNECTED 0x2000 /* socket disconnected from peer */
220
221 #ifdef _KERNEL
222
223 #define SOCK_MTX(so) (&(so)->so_lock)
224 #define SOCK_LOCK(so) mtx_lock(&(so)->so_lock)
225 #define SOCK_OWNED(so) mtx_owned(&(so)->so_lock)
226 #define SOCK_UNLOCK(so) mtx_unlock(&(so)->so_lock)
227 #define SOCK_LOCK_ASSERT(so) mtx_assert(&(so)->so_lock, MA_OWNED)
228 #define SOCK_UNLOCK_ASSERT(so) mtx_assert(&(so)->so_lock, MA_NOTOWNED)
229
230 #define SOLISTENING(sol) (((sol)->so_options & SO_ACCEPTCONN) != 0)
231 #define SOLISTEN_LOCK(sol) do { \
232 mtx_lock(&(sol)->so_lock); \
233 KASSERT(SOLISTENING(sol), \
234 ("%s: %p not listening", __func__, (sol))); \
235 } while (0)
236 #define SOLISTEN_TRYLOCK(sol) mtx_trylock(&(sol)->so_lock)
237 #define SOLISTEN_UNLOCK(sol) do { \
238 KASSERT(SOLISTENING(sol), \
239 ("%s: %p not listening", __func__, (sol))); \
240 mtx_unlock(&(sol)->so_lock); \
241 } while (0)
242 #define SOLISTEN_LOCK_ASSERT(sol) do { \
243 mtx_assert(&(sol)->so_lock, MA_OWNED); \
244 KASSERT(SOLISTENING(sol), \
245 ("%s: %p not listening", __func__, (sol))); \
246 } while (0)
247 #define SOLISTEN_UNLOCK_ASSERT(sol) do { \
248 mtx_assert(&(sol)->so_lock, MA_NOTOWNED); \
249 KASSERT(SOLISTENING(sol), \
250 ("%s: %p not listening", __func__, (sol))); \
251 } while (0)
252
253 /*
254 * Socket buffer locks. These are strongly preferred over SOCKBUF_LOCK(sb)
255 * macros, as we are moving towards protocol specific socket buffers.
256 */
257 #define SOCK_RECVBUF_MTX(so) \
258 (&(so)->so_rcv_mtx)
259 #define SOCK_RECVBUF_LOCK(so) \
260 mtx_lock(SOCK_RECVBUF_MTX(so))
261 #define SOCK_RECVBUF_UNLOCK(so) \
262 mtx_unlock(SOCK_RECVBUF_MTX(so))
263 #define SOCK_RECVBUF_LOCK_ASSERT(so) \
264 mtx_assert(SOCK_RECVBUF_MTX(so), MA_OWNED)
265 #define SOCK_RECVBUF_UNLOCK_ASSERT(so) \
266 mtx_assert(SOCK_RECVBUF_MTX(so), MA_NOTOWNED)
267
268 #define SOCK_SENDBUF_MTX(so) \
269 (&(so)->so_snd_mtx)
270 #define SOCK_SENDBUF_LOCK(so) \
271 mtx_lock(SOCK_SENDBUF_MTX(so))
272 #define SOCK_SENDBUF_UNLOCK(so) \
273 mtx_unlock(SOCK_SENDBUF_MTX(so))
274 #define SOCK_SENDBUF_LOCK_ASSERT(so) \
275 mtx_assert(SOCK_SENDBUF_MTX(so), MA_OWNED)
276 #define SOCK_SENDBUF_UNLOCK_ASSERT(so) \
277 mtx_assert(SOCK_SENDBUF_MTX(so), MA_NOTOWNED)
278
279 #define SOCK_BUF_LOCK(so, which) \
280 mtx_lock(soeventmtx(so, which))
281 #define SOCK_BUF_UNLOCK(so, which) \
282 mtx_unlock(soeventmtx(so, which))
283 #define SOCK_BUF_LOCK_ASSERT(so, which) \
284 mtx_assert(soeventmtx(so, which), MA_OWNED)
285 #define SOCK_BUF_UNLOCK_ASSERT(so, which) \
286 mtx_assert(soeventmtx(so, which), MA_NOTOWNED)
287
288 static inline struct sockbuf *
289 sobuf(struct socket *so, const sb_which which)
290 {
291 return (which == SO_RCV ? &so->so_rcv : &so->so_snd);
292 }
293
294 static inline struct mtx *
295 soeventmtx(struct socket *so, const sb_which which)
296 {
297 return (which == SO_RCV ? SOCK_RECVBUF_MTX(so) : SOCK_SENDBUF_MTX(so));
298 }
299
300 /*
301 * Macros for sockets and socket buffering.
302 */
303
304 /*
305 * Flags to soiolock().
306 */
307 #define SBL_WAIT 0x00000001 /* Wait if not immediately available. */
308 #define SBL_NOINTR 0x00000002 /* Force non-interruptible sleep. */
309 #define SBL_VALID (SBL_WAIT | SBL_NOINTR)
310
311 #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? 0 : SBL_WAIT)
312
313 #define SOCK_IO_SEND_LOCK(so, flags) \
314 soiolock((so), &(so)->so_snd_sx, (flags))
315 #define SOCK_IO_SEND_UNLOCK(so) \
316 soiounlock(&(so)->so_snd_sx)
317 #define SOCK_IO_SEND_OWNED(so) sx_xlocked(&(so)->so_snd_sx)
318 #define SOCK_IO_RECV_LOCK(so, flags) \
319 soiolock((so), &(so)->so_rcv_sx, (flags))
320 #define SOCK_IO_RECV_UNLOCK(so) \
321 soiounlock(&(so)->so_rcv_sx)
322 #define SOCK_IO_RECV_OWNED(so) sx_xlocked(&(so)->so_rcv_sx)
323
324 /* do we have to send all at once on a socket? */
325 #define sosendallatonce(so) \
326 ((so)->so_proto->pr_flags & PR_ATOMIC)
327
328 /* can we read something from so? */
329 #define soreadabledata(so) \
330 (sbavail(&(so)->so_rcv) >= (so)->so_rcv.sb_lowat || \
331 (so)->so_error || (so)->so_rerror)
332 #define soreadable(so) \
333 (soreadabledata(so) || ((so)->so_rcv.sb_state & SBS_CANTRCVMORE))
334
335 /* can we write something to so? */
336 #define sowriteable(so) \
337 ((sbspace(&(so)->so_snd) >= (so)->so_snd.sb_lowat && \
338 (((so)->so_state&SS_ISCONNECTED) || \
339 ((so)->so_proto->pr_flags&PR_CONNREQUIRED)==0)) || \
340 ((so)->so_snd.sb_state & SBS_CANTSENDMORE) || \
341 (so)->so_error)
342
343 /*
344 * soref()/sorele() ref-count the socket structure.
345 * soref() may be called without owning socket lock, but in that case a
346 * caller must own something that holds socket, and so_count must be not 0.
347 * Note that you must still explicitly close the socket, but the last ref
348 * count will free the structure.
349 */
350 #define soref(so) refcount_acquire(&(so)->so_count)
351 #define sorele(so) do { \
352 SOCK_UNLOCK_ASSERT(so); \
353 if (!refcount_release_if_not_last(&(so)->so_count)) { \
354 SOCK_LOCK(so); \
355 sorele_locked(so); \
356 } \
357 } while (0)
358
359 /*
360 * In sorwakeup() and sowwakeup(), acquire the socket buffer lock to
361 * avoid a non-atomic test-and-wakeup. However, sowakeup is
362 * responsible for releasing the lock if it is called. We unlock only
363 * if we don't call into sowakeup. If any code is introduced that
364 * directly invokes the underlying sowakeup() primitives, it must
365 * maintain the same semantics.
366 */
367 #define sorwakeup(so) do { \
368 SOCK_RECVBUF_LOCK(so); \
369 sorwakeup_locked(so); \
370 } while (0)
371
372 #define sowwakeup(so) do { \
373 SOCK_SENDBUF_LOCK(so); \
374 sowwakeup_locked(so); \
375 } while (0)
376
377 struct accept_filter {
378 char accf_name[16];
379 int (*accf_callback)
380 (struct socket *so, void *arg, int waitflag);
381 void * (*accf_create)
382 (struct socket *so, char *arg);
383 void (*accf_destroy)
384 (struct socket *so);
385 SLIST_ENTRY(accept_filter) accf_next;
386 };
387
388 #define ACCEPT_FILTER_DEFINE(modname, filtname, cb, create, destroy, ver) \
389 static struct accept_filter modname##_filter = { \
390 .accf_name = filtname, \
391 .accf_callback = cb, \
392 .accf_create = create, \
393 .accf_destroy = destroy, \
394 }; \
395 static moduledata_t modname##_mod = { \
396 .name = __XSTRING(modname), \
397 .evhand = accept_filt_generic_mod_event, \
398 .priv = &modname##_filter, \
399 }; \
400 DECLARE_MODULE(modname, modname##_mod, SI_SUB_DRIVERS, \
401 SI_ORDER_MIDDLE); \
402 MODULE_VERSION(modname, ver)
403
404 #ifdef MALLOC_DECLARE
405 MALLOC_DECLARE(M_ACCF);
406 MALLOC_DECLARE(M_PCB);
407 MALLOC_DECLARE(M_SONAME);
408 #endif
409
410 /*
411 * Socket specific helper hook point identifiers
412 * Do not leave holes in the sequence, hook registration is a loop.
413 */
414 #define HHOOK_SOCKET_OPT 0
415 #define HHOOK_SOCKET_CREATE 1
416 #define HHOOK_SOCKET_RCV 2
417 #define HHOOK_SOCKET_SND 3
418 #define HHOOK_FILT_SOREAD 4
419 #define HHOOK_FILT_SOWRITE 5
420 #define HHOOK_SOCKET_CLOSE 6
421 #define HHOOK_SOCKET_LAST HHOOK_SOCKET_CLOSE
422
423 struct socket_hhook_data {
424 struct socket *so;
425 struct mbuf *m;
426 void *hctx; /* hook point specific data*/
427 int status;
428 };
429
430 extern int maxsockets;
431 extern u_long sb_max;
432 extern so_gen_t so_gencnt;
433
434 struct file;
435 struct filecaps;
436 struct filedesc;
437 struct mbuf;
438 struct sockaddr;
439 struct ucred;
440 struct uio;
441
442 /* Return values for socket upcalls. */
443 #define SU_OK 0
444 #define SU_ISCONNECTED 1
445
446 /*
447 * From uipc_socket and friends
448 */
449 int getsockaddr(struct sockaddr **namp, const struct sockaddr *uaddr,
450 size_t len);
451 int getsock_cap(struct thread *td, int fd, cap_rights_t *rightsp,
452 struct file **fpp, struct filecaps *havecaps);
453 int getsock(struct thread *td, int fd, cap_rights_t *rightsp,
454 struct file **fpp);
455 void soabort(struct socket *so);
456 int soaccept(struct socket *so, struct sockaddr **nam);
457 void soaio_enqueue(struct task *task);
458 void soaio_rcv(void *context, int pending);
459 void soaio_snd(void *context, int pending);
460 int socheckuid(struct socket *so, uid_t uid);
461 int sobind(struct socket *so, struct sockaddr *nam, struct thread *td);
462 int sobindat(int fd, struct socket *so, struct sockaddr *nam,
463 struct thread *td);
464 int soclose(struct socket *so);
465 int soconnect(struct socket *so, struct sockaddr *nam, struct thread *td);
466 int soconnectat(int fd, struct socket *so, struct sockaddr *nam,
467 struct thread *td);
468 int soconnect2(struct socket *so1, struct socket *so2);
469 int socreate(int dom, struct socket **aso, int type, int proto,
470 struct ucred *cred, struct thread *td);
471 int sodisconnect(struct socket *so);
472 void sodtor_set(struct socket *, so_dtor_t *);
473 struct sockaddr *sodupsockaddr(const struct sockaddr *sa, int mflags);
474 void sohasoutofband(struct socket *so);
475 int solisten(struct socket *so, int backlog, struct thread *td);
476 void solisten_proto(struct socket *so, int backlog);
477 void solisten_proto_abort(struct socket *so);
478 int solisten_proto_check(struct socket *so);
479 bool solisten_enqueue(struct socket *, int);
480 int solisten_dequeue(struct socket *, struct socket **, int);
481 struct socket *
482 solisten_clone(struct socket *);
483 struct socket *
484 sonewconn(struct socket *head, int connstatus);
485 struct socket *
486 sopeeloff(struct socket *);
487 int sopoll(struct socket *so, int events, struct ucred *active_cred,
488 struct thread *td);
489 int sopoll_generic(struct socket *so, int events,
490 struct ucred *active_cred, struct thread *td);
491 int soreceive(struct socket *so, struct sockaddr **paddr, struct uio *uio,
492 struct mbuf **mp0, struct mbuf **controlp, int *flagsp);
493 int soreceive_stream(struct socket *so, struct sockaddr **paddr,
494 struct uio *uio, struct mbuf **mp0, struct mbuf **controlp,
495 int *flagsp);
496 int soreceive_dgram(struct socket *so, struct sockaddr **paddr,
497 struct uio *uio, struct mbuf **mp0, struct mbuf **controlp,
498 int *flagsp);
499 int soreceive_generic(struct socket *so, struct sockaddr **paddr,
500 struct uio *uio, struct mbuf **mp0, struct mbuf **controlp,
501 int *flagsp);
502 void sorele_locked(struct socket *so);
503 void sodealloc(struct socket *);
504 int soreserve(struct socket *so, u_long sndcc, u_long rcvcc);
505 void sorflush(struct socket *so);
506 int sosend(struct socket *so, struct sockaddr *addr, struct uio *uio,
507 struct mbuf *top, struct mbuf *control, int flags,
508 struct thread *td);
509 int sousrsend(struct socket *so, struct sockaddr *addr, struct uio *uio,
510 struct mbuf *control, int flags, struct proc *);
511 int sosend_dgram(struct socket *so, struct sockaddr *addr,
512 struct uio *uio, struct mbuf *top, struct mbuf *control,
513 int flags, struct thread *td);
514 int sosend_generic(struct socket *so, struct sockaddr *addr,
515 struct uio *uio, struct mbuf *top, struct mbuf *control,
516 int flags, struct thread *td);
517 int soshutdown(struct socket *so, int how);
518 void soupcall_clear(struct socket *, sb_which);
519 void soupcall_set(struct socket *, sb_which, so_upcall_t, void *);
520 void solisten_upcall_set(struct socket *, so_upcall_t, void *);
521 void sorwakeup_locked(struct socket *);
522 void sowwakeup_locked(struct socket *);
523 void sowakeup_aio(struct socket *, sb_which);
524 void solisten_wakeup(struct socket *);
525 int selsocket(struct socket *so, int events, struct timeval *tv,
526 struct thread *td);
527 void soisconnected(struct socket *so);
528 void soisconnecting(struct socket *so);
529 void soisdisconnected(struct socket *so);
530 void soisdisconnecting(struct socket *so);
531 void socantrcvmore(struct socket *so);
532 void socantrcvmore_locked(struct socket *so);
533 void socantsendmore(struct socket *so);
534 void socantsendmore_locked(struct socket *so);
535 void soroverflow(struct socket *so);
536 void soroverflow_locked(struct socket *so);
537 int soiolock(struct socket *so, struct sx *sx, int flags);
538 void soiounlock(struct sx *sx);
539
540 /*
541 * Accept filter functions (duh).
542 */
543 int accept_filt_add(struct accept_filter *filt);
544 int accept_filt_del(char *name);
545 struct accept_filter *accept_filt_get(char *name);
546 #ifdef ACCEPT_FILTER_MOD
547 #ifdef SYSCTL_DECL
548 SYSCTL_DECL(_net_inet_accf);
549 #endif
550 int accept_filt_generic_mod_event(module_t mod, int event, void *data);
551 #endif
552
553 #endif /* _KERNEL */
554
555 /*
556 * Structure to export socket from kernel to utilities, via sysctl(3).
557 */
558 struct xsocket {
559 ksize_t xso_len; /* length of this structure */
560 kvaddr_t xso_so; /* kernel address of struct socket */
561 kvaddr_t so_pcb; /* kernel address of struct inpcb */
562 uint64_t so_oobmark;
563 int64_t so_spare64[8];
564 int32_t xso_protocol;
565 int32_t xso_family;
566 uint32_t so_qlen;
567 uint32_t so_incqlen;
568 uint32_t so_qlimit;
569 pid_t so_pgid;
570 uid_t so_uid;
571 int32_t so_spare32[8];
572 int16_t so_type;
573 int16_t so_options;
574 int16_t so_linger;
575 int16_t so_state;
576 int16_t so_timeo;
577 uint16_t so_error;
578 struct xsockbuf {
579 uint32_t sb_cc;
580 uint32_t sb_hiwat;
581 uint32_t sb_mbcnt;
582 uint32_t sb_spare0; /* was sb_mcnt */
583 uint32_t sb_spare1; /* was sb_ccnt */
584 uint32_t sb_mbmax;
585 int32_t sb_lowat;
586 int32_t sb_timeo;
587 int16_t sb_flags;
588 } so_rcv, so_snd;
589 };
590
591 #ifdef _KERNEL
592 void sotoxsocket(struct socket *so, struct xsocket *xso);
593 void sbtoxsockbuf(struct sockbuf *sb, struct xsockbuf *xsb);
594 #endif
595
596 /*
597 * Socket buffer state bits. Exported via libprocstat(3).
598 */
599 #define SBS_CANTSENDMORE 0x0010 /* can't send more data to peer */
600 #define SBS_CANTRCVMORE 0x0020 /* can't receive more data from peer */
601 #define SBS_RCVATMARK 0x0040 /* at mark on input */
602
603 #endif /* !_SYS_SOCKETVAR_H_ */
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