socketvar.h revision 174647
1/*-
2 * Copyright (c) 1982, 1986, 1990, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 *	@(#)socketvar.h	8.3 (Berkeley) 2/19/95
30 * $FreeBSD: head/sys/sys/socketvar.h 174647 2007-12-16 06:21:20Z jeff $
31 */
32
33#ifndef _SYS_SOCKETVAR_H_
34#define _SYS_SOCKETVAR_H_
35
36#include <sys/queue.h>			/* for TAILQ macros */
37#include <sys/selinfo.h>		/* for struct selinfo */
38#include <sys/_lock.h>
39#include <sys/_mutex.h>
40#include <sys/_sx.h>
41
42/*
43 * Kernel structure per socket.
44 * Contains send and receive buffer queues,
45 * handle on protocol and pointer to protocol
46 * private data and error information.
47 */
48typedef	u_quad_t so_gen_t;
49
50/*-
51 * Locking key to struct socket:
52 * (a) constant after allocation, no locking required.
53 * (b) locked by SOCK_LOCK(so).
54 * (c) locked by SOCKBUF_LOCK(&so->so_rcv).
55 * (d) locked by SOCKBUF_LOCK(&so->so_snd).
56 * (e) locked by ACCEPT_LOCK().
57 * (f) not locked since integer reads/writes are atomic.
58 * (g) used only as a sleep/wakeup address, no value.
59 * (h) locked by global mutex so_global_mtx.
60 */
61struct socket {
62	int	so_count;		/* (b) reference count */
63	short	so_type;		/* (a) generic type, see socket.h */
64	short	so_options;		/* from socket call, see socket.h */
65	short	so_linger;		/* time to linger while closing */
66	short	so_state;		/* (b) internal state flags SS_* */
67	int	so_qstate;		/* (e) internal state flags SQ_* */
68	void	*so_pcb;		/* protocol control block */
69	struct	protosw *so_proto;	/* (a) protocol handle */
70/*
71 * Variables for connection queuing.
72 * Socket where accepts occur is so_head in all subsidiary sockets.
73 * If so_head is 0, socket is not related to an accept.
74 * For head socket so_incomp queues partially completed connections,
75 * while so_comp is a queue of connections ready to be accepted.
76 * If a connection is aborted and it has so_head set, then
77 * it has to be pulled out of either so_incomp or so_comp.
78 * We allow connections to queue up based on current queue lengths
79 * and limit on number of queued connections for this socket.
80 */
81	struct	socket *so_head;	/* (e) back pointer to listen socket */
82	TAILQ_HEAD(, socket) so_incomp;	/* (e) queue of partial unaccepted connections */
83	TAILQ_HEAD(, socket) so_comp;	/* (e) queue of complete unaccepted connections */
84	TAILQ_ENTRY(socket) so_list;	/* (e) list of unaccepted connections */
85	u_short	so_qlen;		/* (e) number of unaccepted connections */
86	u_short	so_incqlen;		/* (e) number of unaccepted incomplete
87					   connections */
88	u_short	so_qlimit;		/* (e) max number queued connections */
89	short	so_timeo;		/* (g) connection timeout */
90	u_short	so_error;		/* (f) error affecting connection */
91	struct	sigio *so_sigio;	/* [sg] information for async I/O or
92					   out of band data (SIGURG) */
93	u_long	so_oobmark;		/* (c) chars to oob mark */
94	TAILQ_HEAD(, aiocblist) so_aiojobq; /* AIO ops waiting on socket */
95/*
96 * Variables for socket buffering.
97 */
98	struct sockbuf {
99		struct	selinfo sb_sel;	/* process selecting read/write */
100		struct	mtx sb_mtx;	/* sockbuf lock */
101		struct	sx sb_sx;	/* prevent I/O interlacing */
102		short	sb_state;	/* (c/d) socket state on sockbuf */
103#define	sb_startzero	sb_mb
104		struct	mbuf *sb_mb;	/* (c/d) the mbuf chain */
105		struct	mbuf *sb_mbtail; /* (c/d) the last mbuf in the chain */
106		struct	mbuf *sb_lastrecord;	/* (c/d) first mbuf of last
107						 * record in socket buffer */
108		struct	mbuf *sb_sndptr; /* (c/d) pointer into mbuf chain */
109		u_int	sb_sndptroff;	/* (c/d) byte offset of ptr into chain */
110		u_int	sb_cc;		/* (c/d) actual chars in buffer */
111		u_int	sb_hiwat;	/* (c/d) max actual char count */
112		u_int	sb_mbcnt;	/* (c/d) chars of mbufs used */
113		u_int	sb_mbmax;	/* (c/d) max chars of mbufs to use */
114		u_int	sb_ctl;		/* (c/d) non-data chars in buffer */
115		int	sb_lowat;	/* (c/d) low water mark */
116		int	sb_timeo;	/* (c/d) timeout for read/write */
117		short	sb_flags;	/* (c/d) flags, see below */
118	} so_rcv, so_snd;
119/*
120 * Constants for sb_flags field of struct sockbuf.
121 */
122#define	SB_MAX		(256*1024)	/* default for max chars in sockbuf */
123/*
124 * Constants for sb_flags field of struct sockbuf.
125 */
126#define	SB_WAIT		0x04		/* someone is waiting for data/space */
127#define	SB_SEL		0x08		/* someone is selecting */
128#define	SB_ASYNC	0x10		/* ASYNC I/O, need signals */
129#define	SB_UPCALL	0x20		/* someone wants an upcall */
130#define	SB_NOINTR	0x40		/* operations not interruptible */
131#define	SB_AIO		0x80		/* AIO operations queued */
132#define	SB_KNOTE	0x100		/* kernel note attached */
133#define	SB_AUTOSIZE	0x800		/* automatically size socket buffer */
134
135	void	(*so_upcall)(struct socket *, void *, int);
136	void	*so_upcallarg;
137	struct	ucred *so_cred;		/* (a) user credentials */
138	struct	label *so_label;	/* (b) MAC label for socket */
139	struct	label *so_peerlabel;	/* (b) cached MAC label for peer */
140	/* NB: generation count must not be first. */
141	so_gen_t so_gencnt;		/* (h) generation count */
142	void	*so_emuldata;		/* (b) private data for emulators */
143 	struct so_accf {
144		struct	accept_filter *so_accept_filter;
145		void	*so_accept_filter_arg;	/* saved filter args */
146		char	*so_accept_filter_str;	/* saved user args */
147	} *so_accf;
148};
149
150#define SB_EMPTY_FIXUP(sb) do {						\
151	if ((sb)->sb_mb == NULL) {					\
152		(sb)->sb_mbtail = NULL;					\
153		(sb)->sb_lastrecord = NULL;				\
154	}								\
155} while (/*CONSTCOND*/0)
156
157/*
158 * Global accept mutex to serialize access to accept queues and
159 * fields associated with multiple sockets.  This allows us to
160 * avoid defining a lock order between listen and accept sockets
161 * until such time as it proves to be a good idea.
162 */
163extern struct mtx accept_mtx;
164#define	ACCEPT_LOCK_ASSERT()		mtx_assert(&accept_mtx, MA_OWNED)
165#define	ACCEPT_UNLOCK_ASSERT()		mtx_assert(&accept_mtx, MA_NOTOWNED)
166#define	ACCEPT_LOCK()			mtx_lock(&accept_mtx)
167#define	ACCEPT_UNLOCK()			mtx_unlock(&accept_mtx)
168
169/*
170 * Per-socket buffer mutex used to protect most fields in the socket
171 * buffer.
172 */
173#define	SOCKBUF_MTX(_sb)		(&(_sb)->sb_mtx)
174#define	SOCKBUF_LOCK_INIT(_sb, _name) \
175	mtx_init(SOCKBUF_MTX(_sb), _name, NULL, MTX_DEF)
176#define	SOCKBUF_LOCK_DESTROY(_sb)	mtx_destroy(SOCKBUF_MTX(_sb))
177#define	SOCKBUF_LOCK(_sb)		mtx_lock(SOCKBUF_MTX(_sb))
178#define	SOCKBUF_OWNED(_sb)		mtx_owned(SOCKBUF_MTX(_sb))
179#define	SOCKBUF_UNLOCK(_sb)		mtx_unlock(SOCKBUF_MTX(_sb))
180#define	SOCKBUF_LOCK_ASSERT(_sb)	mtx_assert(SOCKBUF_MTX(_sb), MA_OWNED)
181#define	SOCKBUF_UNLOCK_ASSERT(_sb)	mtx_assert(SOCKBUF_MTX(_sb), MA_NOTOWNED)
182
183/*
184 * Per-socket mutex: we reuse the receive socket buffer mutex for space
185 * efficiency.  This decision should probably be revisited as we optimize
186 * locking for the socket code.
187 */
188#define	SOCK_MTX(_so)			SOCKBUF_MTX(&(_so)->so_rcv)
189#define	SOCK_LOCK(_so)			SOCKBUF_LOCK(&(_so)->so_rcv)
190#define	SOCK_OWNED(_so)			SOCKBUF_OWNED(&(_so)->so_rcv)
191#define	SOCK_UNLOCK(_so)		SOCKBUF_UNLOCK(&(_so)->so_rcv)
192#define	SOCK_LOCK_ASSERT(_so)		SOCKBUF_LOCK_ASSERT(&(_so)->so_rcv)
193
194/*
195 * Socket state bits.
196 *
197 * Historically, this bits were all kept in the so_state field.  For
198 * locking reasons, they are now in multiple fields, as they are
199 * locked differently.  so_state maintains basic socket state protected
200 * by the socket lock.  so_qstate holds information about the socket
201 * accept queues.  Each socket buffer also has a state field holding
202 * information relevant to that socket buffer (can't send, rcv).  Many
203 * fields will be read without locks to improve performance and avoid
204 * lock order issues.  However, this approach must be used with caution.
205 */
206#define	SS_NOFDREF		0x0001	/* no file table ref any more */
207#define	SS_ISCONNECTED		0x0002	/* socket connected to a peer */
208#define	SS_ISCONNECTING		0x0004	/* in process of connecting to peer */
209#define	SS_ISDISCONNECTING	0x0008	/* in process of disconnecting */
210#define	SS_NBIO			0x0100	/* non-blocking ops */
211#define	SS_ASYNC		0x0200	/* async i/o notify */
212#define	SS_ISCONFIRMING		0x0400	/* deciding to accept connection req */
213#define	SS_ISDISCONNECTED	0x2000	/* socket disconnected from peer */
214/*
215 * Protocols can mark a socket as SS_PROTOREF to indicate that, following
216 * pru_detach, they still want the socket to persist, and will free it
217 * themselves when they are done.  Protocols should only ever call sofree()
218 * following setting this flag in pru_detach(), and never otherwise, as
219 * sofree() bypasses socket reference counting.
220 */
221#define	SS_PROTOREF		0x4000	/* strong protocol reference */
222
223/*
224 * Socket state bits now stored in the socket buffer state field.
225 */
226#define	SBS_CANTSENDMORE	0x0010	/* can't send more data to peer */
227#define	SBS_CANTRCVMORE		0x0020	/* can't receive more data from peer */
228#define	SBS_RCVATMARK		0x0040	/* at mark on input */
229
230/*
231 * Socket state bits stored in so_qstate.
232 */
233#define	SQ_INCOMP		0x0800	/* unaccepted, incomplete connection */
234#define	SQ_COMP			0x1000	/* unaccepted, complete connection */
235
236/*
237 * Externalized form of struct socket used by the sysctl(3) interface.
238 */
239struct xsocket {
240	size_t	xso_len;	/* length of this structure */
241	struct	socket *xso_so;	/* makes a convenient handle sometimes */
242	short	so_type;
243	short	so_options;
244	short	so_linger;
245	short	so_state;
246	caddr_t	so_pcb;		/* another convenient handle */
247	int	xso_protocol;
248	int	xso_family;
249	u_short	so_qlen;
250	u_short	so_incqlen;
251	u_short	so_qlimit;
252	short	so_timeo;
253	u_short	so_error;
254	pid_t	so_pgid;
255	u_long	so_oobmark;
256	struct xsockbuf {
257		u_int	sb_cc;
258		u_int	sb_hiwat;
259		u_int	sb_mbcnt;
260		u_int	sb_mbmax;
261		int	sb_lowat;
262		int	sb_timeo;
263		short	sb_flags;
264	} so_rcv, so_snd;
265	uid_t	so_uid;		/* XXX */
266};
267
268#ifdef _KERNEL
269
270/*
271 * Macros for sockets and socket buffering.
272 */
273
274/*
275 * Do we need to notify the other side when I/O is possible?
276 */
277#define	sb_notify(sb)	(((sb)->sb_flags & (SB_WAIT | SB_SEL | SB_ASYNC | \
278    SB_UPCALL | SB_AIO | SB_KNOTE)) != 0)
279
280/*
281 * How much space is there in a socket buffer (so->so_snd or so->so_rcv)?
282 * This is problematical if the fields are unsigned, as the space might
283 * still be negative (cc > hiwat or mbcnt > mbmax).  Should detect
284 * overflow and return 0.  Should use "lmin" but it doesn't exist now.
285 */
286#define	sbspace(sb) \
287    ((long) imin((int)((sb)->sb_hiwat - (sb)->sb_cc), \
288	 (int)((sb)->sb_mbmax - (sb)->sb_mbcnt)))
289
290/* do we have to send all at once on a socket? */
291#define	sosendallatonce(so) \
292    ((so)->so_proto->pr_flags & PR_ATOMIC)
293
294/* can we read something from so? */
295#define	soreadable(so) \
296    ((so)->so_rcv.sb_cc >= (so)->so_rcv.sb_lowat || \
297	((so)->so_rcv.sb_state & SBS_CANTRCVMORE) || \
298	!TAILQ_EMPTY(&(so)->so_comp) || (so)->so_error)
299
300/* can we write something to so? */
301#define	sowriteable(so) \
302    ((sbspace(&(so)->so_snd) >= (so)->so_snd.sb_lowat && \
303	(((so)->so_state&SS_ISCONNECTED) || \
304	  ((so)->so_proto->pr_flags&PR_CONNREQUIRED)==0)) || \
305     ((so)->so_snd.sb_state & SBS_CANTSENDMORE) || \
306     (so)->so_error)
307
308/* adjust counters in sb reflecting allocation of m */
309#define	sballoc(sb, m) { \
310	(sb)->sb_cc += (m)->m_len; \
311	if ((m)->m_type != MT_DATA && (m)->m_type != MT_OOBDATA) \
312		(sb)->sb_ctl += (m)->m_len; \
313	(sb)->sb_mbcnt += MSIZE; \
314	if ((m)->m_flags & M_EXT) \
315		(sb)->sb_mbcnt += (m)->m_ext.ext_size; \
316}
317
318/* adjust counters in sb reflecting freeing of m */
319#define	sbfree(sb, m) { \
320	(sb)->sb_cc -= (m)->m_len; \
321	if ((m)->m_type != MT_DATA && (m)->m_type != MT_OOBDATA) \
322		(sb)->sb_ctl -= (m)->m_len; \
323	(sb)->sb_mbcnt -= MSIZE; \
324	if ((m)->m_flags & M_EXT) \
325		(sb)->sb_mbcnt -= (m)->m_ext.ext_size; \
326	if ((sb)->sb_sndptr == (m)) { \
327		(sb)->sb_sndptr = NULL; \
328		(sb)->sb_sndptroff = 0; \
329	} \
330	if ((sb)->sb_sndptroff != 0) \
331		(sb)->sb_sndptroff -= (m)->m_len; \
332}
333
334/*
335 * soref()/sorele() ref-count the socket structure.  Note that you must
336 * still explicitly close the socket, but the last ref count will free
337 * the structure.
338 */
339#define	soref(so) do {							\
340	SOCK_LOCK_ASSERT(so);						\
341	++(so)->so_count;						\
342} while (0)
343
344#define	sorele(so) do {							\
345	ACCEPT_LOCK_ASSERT();						\
346	SOCK_LOCK_ASSERT(so);						\
347	if ((so)->so_count <= 0)					\
348		panic("sorele");					\
349	if (--(so)->so_count == 0)					\
350		sofree(so);						\
351	else {								\
352		SOCK_UNLOCK(so);					\
353		ACCEPT_UNLOCK();					\
354	}								\
355} while (0)
356
357#define	sotryfree(so) do {						\
358	ACCEPT_LOCK_ASSERT();						\
359	SOCK_LOCK_ASSERT(so);						\
360	if ((so)->so_count == 0)					\
361		sofree(so);						\
362	else {								\
363		SOCK_UNLOCK(so);					\
364		ACCEPT_UNLOCK();					\
365	}								\
366} while(0)
367
368/*
369 * In sorwakeup() and sowwakeup(), acquire the socket buffer lock to
370 * avoid a non-atomic test-and-wakeup.  However, sowakeup is
371 * responsible for releasing the lock if it is called.  We unlock only
372 * if we don't call into sowakeup.  If any code is introduced that
373 * directly invokes the underlying sowakeup() primitives, it must
374 * maintain the same semantics.
375 */
376#define	sorwakeup_locked(so) do {					\
377	SOCKBUF_LOCK_ASSERT(&(so)->so_rcv);				\
378	if (sb_notify(&(so)->so_rcv))					\
379		sowakeup((so), &(so)->so_rcv);	 			\
380	else								\
381		SOCKBUF_UNLOCK(&(so)->so_rcv);				\
382} while (0)
383
384#define	sorwakeup(so) do {						\
385	SOCKBUF_LOCK(&(so)->so_rcv);					\
386	sorwakeup_locked(so);						\
387} while (0)
388
389#define	sowwakeup_locked(so) do {					\
390	SOCKBUF_LOCK_ASSERT(&(so)->so_snd);				\
391	if (sb_notify(&(so)->so_snd))					\
392		sowakeup((so), &(so)->so_snd); 				\
393	else								\
394		SOCKBUF_UNLOCK(&(so)->so_snd);				\
395} while (0)
396
397#define	sowwakeup(so) do {						\
398	SOCKBUF_LOCK(&(so)->so_snd);					\
399	sowwakeup_locked(so);						\
400} while (0)
401
402/*
403 * Argument structure for sosetopt et seq.  This is in the KERNEL
404 * section because it will never be visible to user code.
405 */
406enum sopt_dir { SOPT_GET, SOPT_SET };
407struct sockopt {
408	enum	sopt_dir sopt_dir; /* is this a get or a set? */
409	int	sopt_level;	/* second arg of [gs]etsockopt */
410	int	sopt_name;	/* third arg of [gs]etsockopt */
411	void   *sopt_val;	/* fourth arg of [gs]etsockopt */
412	size_t	sopt_valsize;	/* (almost) fifth arg of [gs]etsockopt */
413	struct	thread *sopt_td; /* calling thread or null if kernel */
414};
415
416struct accept_filter {
417	char	accf_name[16];
418	void	(*accf_callback)
419		(struct socket *so, void *arg, int waitflag);
420	void *	(*accf_create)
421		(struct socket *so, char *arg);
422	void	(*accf_destroy)
423		(struct socket *so);
424	SLIST_ENTRY(accept_filter) accf_next;
425};
426
427#ifdef MALLOC_DECLARE
428MALLOC_DECLARE(M_ACCF);
429MALLOC_DECLARE(M_PCB);
430MALLOC_DECLARE(M_SONAME);
431#endif
432
433extern int	maxsockets;
434extern u_long	sb_max;
435extern struct uma_zone *socket_zone;
436extern so_gen_t so_gencnt;
437
438struct mbuf;
439struct sockaddr;
440struct ucred;
441struct uio;
442
443/*
444 * From uipc_socket and friends
445 */
446int	do_getopt_accept_filter(struct socket *so, struct sockopt *sopt);
447int	do_setopt_accept_filter(struct socket *so, struct sockopt *sopt);
448int	so_setsockopt(struct socket *so, int level, int optname,
449	    void *optval, size_t optlen);
450int	sockargs(struct mbuf **mp, caddr_t buf, int buflen, int type);
451int	getsockaddr(struct sockaddr **namp, caddr_t uaddr, size_t len);
452void	sbappend(struct sockbuf *sb, struct mbuf *m);
453void	sbappend_locked(struct sockbuf *sb, struct mbuf *m);
454void	sbappendstream(struct sockbuf *sb, struct mbuf *m);
455void	sbappendstream_locked(struct sockbuf *sb, struct mbuf *m);
456int	sbappendaddr(struct sockbuf *sb, const struct sockaddr *asa,
457	    struct mbuf *m0, struct mbuf *control);
458int	sbappendaddr_locked(struct sockbuf *sb, const struct sockaddr *asa,
459	    struct mbuf *m0, struct mbuf *control);
460int	sbappendcontrol(struct sockbuf *sb, struct mbuf *m0,
461	    struct mbuf *control);
462int	sbappendcontrol_locked(struct sockbuf *sb, struct mbuf *m0,
463	    struct mbuf *control);
464void	sbappendrecord(struct sockbuf *sb, struct mbuf *m0);
465void	sbappendrecord_locked(struct sockbuf *sb, struct mbuf *m0);
466void	sbcheck(struct sockbuf *sb);
467void	sbcompress(struct sockbuf *sb, struct mbuf *m, struct mbuf *n);
468struct mbuf *
469	sbcreatecontrol(caddr_t p, int size, int type, int level);
470void	sbdestroy(struct sockbuf *sb, struct socket *so);
471void	sbdrop(struct sockbuf *sb, int len);
472void	sbdrop_locked(struct sockbuf *sb, int len);
473void	sbdroprecord(struct sockbuf *sb);
474void	sbdroprecord_locked(struct sockbuf *sb);
475void	sbflush(struct sockbuf *sb);
476void	sbflush_locked(struct sockbuf *sb);
477void	sbrelease(struct sockbuf *sb, struct socket *so);
478void	sbrelease_locked(struct sockbuf *sb, struct socket *so);
479int	sbreserve(struct sockbuf *sb, u_long cc, struct socket *so,
480	    struct thread *td);
481int	sbreserve_locked(struct sockbuf *sb, u_long cc, struct socket *so,
482	    struct thread *td);
483struct mbuf *
484	sbsndptr(struct sockbuf *sb, u_int off, u_int len, u_int *moff);
485void	sbtoxsockbuf(struct sockbuf *sb, struct xsockbuf *xsb);
486int	sbwait(struct sockbuf *sb);
487int	sblock(struct sockbuf *sb, int flags);
488void	sbunlock(struct sockbuf *sb);
489void	soabort(struct socket *so);
490int	soaccept(struct socket *so, struct sockaddr **nam);
491int	socheckuid(struct socket *so, uid_t uid);
492int	sobind(struct socket *so, struct sockaddr *nam, struct thread *td);
493void	socantrcvmore(struct socket *so);
494void	socantrcvmore_locked(struct socket *so);
495void	socantsendmore(struct socket *so);
496void	socantsendmore_locked(struct socket *so);
497int	soclose(struct socket *so);
498int	soconnect(struct socket *so, struct sockaddr *nam, struct thread *td);
499int	soconnect2(struct socket *so1, struct socket *so2);
500int	socow_setup(struct mbuf *m0, struct uio *uio);
501int	socreate(int dom, struct socket **aso, int type, int proto,
502	    struct ucred *cred, struct thread *td);
503int	sodisconnect(struct socket *so);
504struct	sockaddr *sodupsockaddr(const struct sockaddr *sa, int mflags);
505void	sofree(struct socket *so);
506int	sogetopt(struct socket *so, struct sockopt *sopt);
507void	sohasoutofband(struct socket *so);
508void	soisconnected(struct socket *so);
509void	soisconnecting(struct socket *so);
510void	soisdisconnected(struct socket *so);
511void	soisdisconnecting(struct socket *so);
512int	solisten(struct socket *so, int backlog, struct thread *td);
513void	solisten_proto(struct socket *so, int backlog);
514int	solisten_proto_check(struct socket *so);
515struct socket *
516	sonewconn(struct socket *head, int connstatus);
517int	sooptcopyin(struct sockopt *sopt, void *buf, size_t len, size_t minlen);
518int	sooptcopyout(struct sockopt *sopt, const void *buf, size_t len);
519
520/* XXX; prepare mbuf for (__FreeBSD__ < 3) routines. */
521int	soopt_getm(struct sockopt *sopt, struct mbuf **mp);
522int	soopt_mcopyin(struct sockopt *sopt, struct mbuf *m);
523int	soopt_mcopyout(struct sockopt *sopt, struct mbuf *m);
524
525int	sopoll(struct socket *so, int events, struct ucred *active_cred,
526	    struct thread *td);
527int	sopoll_generic(struct socket *so, int events,
528	    struct ucred *active_cred, struct thread *td);
529int	soreceive(struct socket *so, struct sockaddr **paddr, struct uio *uio,
530	    struct mbuf **mp0, struct mbuf **controlp, int *flagsp);
531int	soreceive_generic(struct socket *so, struct sockaddr **paddr,
532	    struct uio *uio, struct mbuf **mp0, struct mbuf **controlp,
533	    int *flagsp);
534int	soreserve(struct socket *so, u_long sndcc, u_long rcvcc);
535void	sorflush(struct socket *so);
536int	sosend(struct socket *so, struct sockaddr *addr, struct uio *uio,
537	    struct mbuf *top, struct mbuf *control, int flags,
538	    struct thread *td);
539int	sosend_dgram(struct socket *so, struct sockaddr *addr,
540	    struct uio *uio, struct mbuf *top, struct mbuf *control,
541	    int flags, struct thread *td);
542int	sosend_generic(struct socket *so, struct sockaddr *addr,
543	    struct uio *uio, struct mbuf *top, struct mbuf *control,
544	    int flags, struct thread *td);
545int	sosetopt(struct socket *so, struct sockopt *sopt);
546int	soshutdown(struct socket *so, int how);
547void	sotoxsocket(struct socket *so, struct xsocket *xso);
548void	sowakeup(struct socket *so, struct sockbuf *sb);
549int	selsocket(struct socket *so, int events, struct timeval *tv,
550	    struct thread *td);
551
552#ifdef SOCKBUF_DEBUG
553void	sblastrecordchk(struct sockbuf *, const char *, int);
554#define	SBLASTRECORDCHK(sb)	sblastrecordchk((sb), __FILE__, __LINE__)
555
556void	sblastmbufchk(struct sockbuf *, const char *, int);
557#define	SBLASTMBUFCHK(sb)	sblastmbufchk((sb), __FILE__, __LINE__)
558#else
559#define	SBLASTRECORDCHK(sb)      /* nothing */
560#define	SBLASTMBUFCHK(sb)        /* nothing */
561#endif /* SOCKBUF_DEBUG */
562
563/*
564 * Accept filter functions (duh).
565 */
566int	accept_filt_add(struct accept_filter *filt);
567int	accept_filt_del(char *name);
568struct	accept_filter *accept_filt_get(char *name);
569#ifdef ACCEPT_FILTER_MOD
570#ifdef SYSCTL_DECL
571SYSCTL_DECL(_net_inet_accf);
572#endif
573int	accept_filt_generic_mod_event(module_t mod, int event, void *data);
574#endif
575
576#endif /* _KERNEL */
577
578#endif /* !_SYS_SOCKETVAR_H_ */
579