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33 * @(#)socketvar.h 8.3 (Berkeley) 2/19/95
34 * $FreeBSD: src/sys/sys/socketvar.h,v 1.46.2.10 2003/08/24 08:24:39 hsu Exp $
35 * $DragonFly: src/sys/sys/socketvar.h,v 1.35 2008/08/28 23:15:45 dillon Exp $
38 #ifndef _SYS_SOCKETVAR_H_
39 #define _SYS_SOCKETVAR_H_
42 #include <sys/types.h>
45 #include <sys/queue.h> /* for TAILQ macros */
48 #include <sys/event.h> /* for struct kqinfo */
50 #ifndef _SYS_SOCKBUF_H_
51 #include <sys/sockbuf.h>
54 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
59 * Signaling socket buffers contain additional elements for locking
60 * and signaling conditions. These are used primarily by sockets.
62 * WARNING: See partial clearing of fields in kern/uipc_socket.c
63 * sorflush() and sowflush().
65 struct signalsockbuf {
67 struct kqinfo ssb_kq; /* process selecting read/write */
68 uint32_t ssb_flags; /* flags, see below (use atomic ops) */
69 short ssb_timeo; /* timeout for read/write */
71 long ssb_lowat; /* low water mark */
72 u_long ssb_hiwat; /* high water mark / max actual char count */
73 u_long ssb_mbmax; /* max chars of mbufs to use */
76 #define ssb_cc sb.sb_cc /* commonly used fields */
77 #define ssb_mb sb.sb_mb /* commonly used fields */
78 #define ssb_mbcnt sb.sb_mbcnt /* commonly used fields */
80 #define SSB_LOCK 0x0001 /* lock on data queue */
81 #define SSB_WANT 0x0002 /* someone is waiting to lock */
82 #define SSB_WAIT 0x0004 /* someone is waiting for data/space */
83 #define SSB_ASYNC 0x0010 /* ASYNC I/O, need signals */
84 #define SSB_UPCALL 0x0020 /* someone wants an upcall */
85 #define SSB_NOINTR 0x0040 /* operations not interruptible */
86 #define SSB_AIO 0x0080 /* AIO operations queued */
87 #define SSB_KNOTE 0x0100 /* kernel note attached */
88 #define SSB_MEVENT 0x0200 /* need message event notification */
89 #define SSB_STOP 0x0400 /* backpressure indicator */
90 #define SSB_AUTOSIZE 0x0800 /* automatically size socket buffer */
91 #define SSB_AUTOLOWAT 0x1000 /* automatically scale lowat */
92 #define SSB_WAKEUP 0x2000 /* wakeup event race */
94 #define SSB_CLEAR_MASK (SSB_ASYNC | SSB_UPCALL | SSB_STOP | \
95 SSB_AUTOSIZE | SSB_AUTOLOWAT)
97 #define SSB_NOTIFY_MASK (SSB_WAIT | SSB_ASYNC | SSB_UPCALL | \
98 SSB_AIO | SSB_KNOTE | SSB_MEVENT)
101 * Per-socket kernel structure. Contains universal send and receive queues,
102 * protocol control handle, and error information.
105 short so_type; /* generic type, see socket.h */
106 short so_options; /* from socket call, see socket.h */
107 short so_linger; /* time to linger while closing */
108 short so_state; /* internal state flags SS_*, below */
109 void *so_pcb; /* protocol control block */
110 struct protosw *so_proto; /* protocol handle */
111 struct socket *so_head; /* back pointer to accept socket */
112 lwkt_port_t so_port; /* message port */
115 * These fields are used to manage sockets capable of accepting
118 TAILQ_HEAD(, socket) so_incomp; /* in-progress, incomplete */
119 TAILQ_HEAD(, socket) so_comp; /* completed but not yet accepted */
120 TAILQ_ENTRY(socket) so_list; /* list of unaccepted connections */
121 short so_qlen; /* so_comp count */
122 short so_incqlen; /* so_incomp count */
123 short so_qlimit; /* max number queued connections */
126 * Misc socket support
128 short so_timeo; /* connection timeout */
129 u_short so_error; /* error affecting connection */
130 struct sigio *so_sigio; /* information for async I/O or
131 out of band data (SIGURG) */
132 u_long so_oobmark; /* chars to oob mark */
133 TAILQ_HEAD(, aiocblist) so_aiojobq; /* AIO ops waiting on socket */
134 struct signalsockbuf so_rcv;
135 struct signalsockbuf so_snd;
137 void (*so_upcall) (struct socket *, void *, int);
139 struct ucred *so_cred; /* user credentials */
140 /* NB: generation count must not be first; easiest to make it last. */
141 void *so_emuldata; /* private data for emulators */
143 struct accept_filter *so_accept_filter;
144 void *so_accept_filter_arg; /* saved filter args */
145 char *so_accept_filter_str; /* saved user args */
154 #define SS_NOFDREF 0x0001 /* no file table ref any more */
155 #define SS_ISCONNECTED 0x0002 /* socket connected to a peer */
156 #define SS_ISCONNECTING 0x0004 /* in process of connecting to peer */
157 #define SS_ISDISCONNECTING 0x0008 /* in process of disconnecting */
158 #define SS_CANTSENDMORE 0x0010 /* can't send more data to peer */
159 #define SS_CANTRCVMORE 0x0020 /* can't receive more data from peer */
160 #define SS_RCVATMARK 0x0040 /* at mark on input */
162 #define SS_ABORTING 0x0100 /* so_abort() in progress */
163 #define SS_ASYNC 0x0200 /* async i/o notify */
164 #define SS_ISCONFIRMING 0x0400 /* deciding to accept connection req */
166 #define SS_INCOMP 0x0800 /* unaccepted, incomplete connection */
167 #define SS_COMP 0x1000 /* unaccepted, complete connection */
168 #define SS_ISDISCONNECTED 0x2000 /* socket disconnected from peer */
171 * Externalized form of struct socket used by the sysctl(3) interface.
174 size_t xso_len; /* length of this structure */
175 struct socket *xso_so; /* makes a convenient handle sometimes */
180 void *so_pcb; /* another convenient handle */
199 uid_t so_uid; /* XXX */
203 * Macros for sockets and socket buffering.
206 #define sosendallatonce(so) \
207 ((so)->so_proto->pr_flags & PR_ATOMIC)
209 /* can we read something from so? */
210 #define soreadable(so) \
211 ((so)->so_rcv.ssb_cc >= (so)->so_rcv.ssb_lowat || \
212 ((so)->so_state & SS_CANTRCVMORE) || \
213 !TAILQ_EMPTY(&(so)->so_comp) || (so)->so_error)
215 /* can we write something to so? */
216 #define sowriteable(so) \
217 ((ssb_space(&(so)->so_snd) >= (so)->so_snd.ssb_lowat && \
218 (((so)->so_state&SS_ISCONNECTED) || \
219 ((so)->so_proto->pr_flags&PR_CONNREQUIRED)==0)) || \
220 ((so)->so_state & SS_CANTSENDMORE) || \
224 * Do we need to notify the other side when I/O is possible?
226 * NOTE: Interlock for ssb_wait/wakeup. The protocol side will set
227 * SSB_WAKEUP asynchronously and this can race, so if it isn't
228 * set we have to go through the full-on notification check.
229 * If it is set but no waiting ever takes place it simply
232 #define ssb_notify(ssb) \
233 (((ssb)->ssb_flags & SSB_NOTIFY_MASK) || \
234 ((ssb)->ssb_flags & SSB_WAKEUP) == 0)
236 /* do we have to send all at once on a socket? */
241 * How much space is there in a socket buffer (so->so_snd or so->so_rcv)?
242 * This is problematical if the fields are unsigned, as the space might
243 * still be negative (cc > hiwat or mbcnt > mbmax). Should detect
244 * overflow and return 0.
246 * SSB_STOP ignores cc/hiwat and returns 0. This is used by unix domain
247 * stream sockets to signal backpressure.
251 ssb_space(struct signalsockbuf *ssb)
256 if (ssb->ssb_flags & SSB_STOP)
258 bleft = ssb->ssb_hiwat - ssb->ssb_cc;
259 mleft = ssb->ssb_mbmax - ssb->ssb_mbcnt;
260 return((bleft < mleft) ? bleft : mleft);
265 #define ssb_append(ssb, m) \
266 sbappend(&(ssb)->sb, m)
268 #define ssb_appendstream(ssb, m) \
269 sbappendstream(&(ssb)->sb, m)
271 #define ssb_appendrecord(ssb, m) \
272 sbappendrecord(&(ssb)->sb, m)
274 #define ssb_appendaddr(ssb, src, m, control) \
275 ((ssb_space(ssb) <= 0) ? 0 : sbappendaddr(&(ssb)->sb, src, m, control))
277 #define ssb_appendcontrol(ssb, m, control) \
278 ((ssb_space(ssb) <= 0) ? 0 : sbappendcontrol(&(ssb)->sb, m, control))
280 #define ssb_insert_knote(ssb, kn) { \
281 knote_insert(&(ssb)->ssb_kq.ki_note, kn); \
282 atomic_set_int(&(ssb)->ssb_flags, SSB_KNOTE); \
285 #define ssb_remove_knote(ssb, kn) { \
286 knote_remove(&(ssb)->ssb_kq.ki_note, kn); \
287 if (SLIST_EMPTY(&(ssb)->ssb_kq.ki_note)) \
288 atomic_clear_int(&(ssb)->ssb_flags, SSB_KNOTE); \
291 #define sorwakeup(so) \
293 if (ssb_notify(&(so)->so_rcv)) \
294 sowakeup((so), &(so)->so_rcv); \
297 #define sowwakeup(so) \
299 if (ssb_notify(&(so)->so_snd)) \
300 sowakeup((so), &(so)->so_snd); \
306 * Argument structure for sosetopt et seq. This is in the KERNEL
307 * section because it will never be visible to user code.
309 enum sopt_dir { SOPT_GET, SOPT_SET };
311 enum sopt_dir sopt_dir; /* is this a get or a set? */
312 int sopt_level; /* second arg of [gs]etsockopt */
313 int sopt_name; /* third arg of [gs]etsockopt */
314 void *sopt_val; /* fourth arg of [gs]etsockopt */
315 size_t sopt_valsize; /* (almost) fifth arg of [gs]etsockopt */
316 struct thread *sopt_td; /* calling thread or null if kernel */
319 struct accept_filter {
321 void (*accf_callback)
322 (struct socket *so, void *arg, int waitflag);
323 void * (*accf_create)
324 (struct socket *so, char *arg);
327 SLIST_ENTRY(accept_filter) accf_next; /* next on the list */
330 #ifdef MALLOC_DECLARE
331 MALLOC_DECLARE(M_PCB);
332 MALLOC_DECLARE(M_SONAME);
333 MALLOC_DECLARE(M_ACCF);
336 extern int maxsockets;
337 extern u_long sb_max; /* nominal limit */
338 extern u_long sb_max_adj; /* actual limit used by sbreserve() */
352 * File operations on sockets.
354 int soo_read (struct file *fp, struct uio *uio, struct ucred *cred,
356 int soo_write (struct file *fp, struct uio *uio, struct ucred *cred,
358 int soo_close (struct file *fp);
359 int soo_shutdown (struct file *fp, int how);
360 int soo_ioctl (struct file *fp, u_long cmd, caddr_t data,
361 struct ucred *cred, struct sysmsg *msg);
362 int soo_stat (struct file *fp, struct stat *ub, struct ucred *cred);
363 int sokqfilter (struct file *fp, struct knote *kn);
366 * From uipc_socket and friends
368 struct sockaddr *dup_sockaddr (const struct sockaddr *sa);
369 int getsockaddr (struct sockaddr **namp, caddr_t uaddr, size_t len);
371 void ssb_release (struct signalsockbuf *ssb, struct socket *so);
372 int ssb_reserve (struct signalsockbuf *ssb, u_long cc, struct socket *so,
374 void ssbtoxsockbuf (struct signalsockbuf *sb, struct xsockbuf *xsb);
375 int ssb_wait (struct signalsockbuf *sb);
376 int _ssb_lock (struct signalsockbuf *sb);
378 void soabort (struct socket *so);
379 void soaborta (struct socket *so);
380 void soabort_oncpu (struct socket *so);
381 int soaccept (struct socket *so, struct sockaddr **nam);
382 struct socket *soalloc (int waitok);
383 int sobind (struct socket *so, struct sockaddr *nam, struct thread *td);
384 void socantrcvmore (struct socket *so);
385 void socantsendmore (struct socket *so);
386 int socket_wait (struct socket *so, struct timespec *ts, int *res);
387 int soclose (struct socket *so, int fflags);
388 int soconnect (struct socket *so, struct sockaddr *nam, struct thread *td);
389 int soconnect2 (struct socket *so1, struct socket *so2);
390 int socreate (int dom, struct socket **aso, int type, int proto,
392 void sodealloc (struct socket *so);
393 int sodisconnect (struct socket *so);
394 void sofree (struct socket *so);
395 int sogetopt (struct socket *so, struct sockopt *sopt);
396 void sohasoutofband (struct socket *so);
397 void soisconnected (struct socket *so);
398 void soisconnecting (struct socket *so);
399 void soisdisconnected (struct socket *so);
400 void soisdisconnecting (struct socket *so);
401 void soisreconnected (struct socket *so);
402 void soisreconnecting (struct socket *so);
403 void sosetport (struct socket *so, struct lwkt_port *port);
404 int solisten (struct socket *so, int backlog, struct thread *td);
405 struct socket *sonewconn (struct socket *head, int connstatus);
406 int sooptcopyin (struct sockopt *sopt, void *buf, size_t len,
408 int soopt_to_kbuf (struct sockopt *sopt, void *buf, size_t len,
410 int sooptcopyout (struct sockopt *sopt, const void *buf, size_t len);
411 void soopt_from_kbuf (struct sockopt *sopt, const void *buf, size_t len);
413 /* XXX; prepare mbuf for (__FreeBSD__ < 3) routines. */
414 int soopt_getm (struct sockopt *sopt, struct mbuf **mp);
415 int soopt_mcopyin (struct sockopt *sopt, struct mbuf *m);
416 void soopt_to_mbuf (struct sockopt *sopt, struct mbuf *m);
417 int soopt_mcopyout (struct sockopt *sopt, struct mbuf *m);
418 int soopt_from_mbuf (struct sockopt *sopt, struct mbuf *m);
420 int soreceive (struct socket *so, struct sockaddr **paddr,
421 struct uio *uio, struct sockbuf *sio,
422 struct mbuf **controlp, int *flagsp);
423 int soreserve (struct socket *so, u_long sndcc, u_long rcvcc,
425 void sorflush (struct socket *so);
426 int sosend (struct socket *so, struct sockaddr *addr, struct uio *uio,
427 struct mbuf *top, struct mbuf *control, int flags,
429 int sosendudp (struct socket *so, struct sockaddr *addr, struct uio *uio,
430 struct mbuf *top, struct mbuf *control, int flags,
432 int sosetopt (struct socket *so, struct sockopt *sopt);
433 int soshutdown (struct socket *so, int how);
434 void sotoxsocket (struct socket *so, struct xsocket *xso);
435 void sowakeup (struct socket *so, struct signalsockbuf *sb);
437 /* accept filter functions */
438 int accept_filt_add (struct accept_filter *filt);
439 int accept_filt_del (char *name);
440 struct accept_filter * accept_filt_get (char *name);
441 #ifdef ACCEPT_FILTER_MOD
442 int accept_filt_generic_mod_event (module_t mod, int event, void *data);
443 SYSCTL_DECL(_net_inet_accf);
444 #endif /* ACCEPT_FILTER_MOD */
448 #endif /* !_SYS_SOCKETVAR_H_ */