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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_THREAD_H_
51 #include <sys/thread.h> /* for struct lwkt_token */
53 #ifndef _SYS_SOCKBUF_H_
54 #include <sys/sockbuf.h>
57 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
59 #ifndef _NET_NETMSG_H_
60 #include <net/netmsg.h>
66 * Signaling socket buffers contain additional elements for locking
67 * and signaling conditions. These are used primarily by sockets.
69 * WARNING: See partial clearing of fields in kern/uipc_socket.c
70 * sorflush() and sowflush().
72 struct signalsockbuf {
74 struct kqinfo ssb_kq; /* process selecting read/write */
75 uint32_t ssb_flags; /* flags, see below (use atomic ops) */
76 u_int ssb_timeo; /* timeout for read/write */
77 long ssb_lowat; /* low water mark */
78 u_long ssb_hiwat; /* high water mark / max actual char count */
79 u_long ssb_mbmax; /* max chars of mbufs to use */
80 struct lwkt_token ssb_token; /* frontend/backend serializer */
83 #define ssb_cc sb.sb_cc /* commonly used fields */
84 #define ssb_mb sb.sb_mb /* commonly used fields */
85 #define ssb_mbcnt sb.sb_mbcnt /* commonly used fields */
87 #define SSB_LOCK 0x0001 /* lock on data queue */
88 #define SSB_WANT 0x0002 /* someone is waiting to lock */
89 #define SSB_WAIT 0x0004 /* someone is waiting for data/space */
90 #define SSB_ASYNC 0x0010 /* ASYNC I/O, need signals */
91 #define SSB_UPCALL 0x0020 /* someone wants an upcall */
92 #define SSB_NOINTR 0x0040 /* operations not interruptible */
93 /*#define SSB_AIO 0x0080*/ /* AIO operations queued */
94 #define SSB_KNOTE 0x0100 /* kernel note attached */
95 #define SSB_MEVENT 0x0200 /* need message event notification */
96 #define SSB_STOP 0x0400 /* backpressure indicator */
97 #define SSB_AUTOSIZE 0x0800 /* automatically size socket buffer */
98 #define SSB_AUTOLOWAT 0x1000 /* automatically scale lowat */
99 #define SSB_WAKEUP 0x2000 /* wakeup event race */
101 #define SSB_CLEAR_MASK (SSB_ASYNC | SSB_UPCALL | SSB_STOP | \
102 SSB_AUTOSIZE | SSB_AUTOLOWAT)
104 #define SSB_NOTIFY_MASK (SSB_WAIT | SSB_ASYNC | SSB_UPCALL | \
105 SSB_KNOTE | SSB_MEVENT)
108 * Per-socket kernel structure. Contains universal send and receive queues,
109 * protocol control handle, and error information.
112 short so_type; /* generic type, see socket.h */
113 short so_options; /* from socket call, see socket.h */
114 short so_linger; /* time to linger while closing */
115 short so_state; /* internal state flags SS_*, below */
116 void *so_pcb; /* protocol control block */
117 struct protosw *so_proto; /* protocol handle */
118 struct socket *so_head; /* back pointer to accept socket */
119 lwkt_port_t so_port; /* message port */
122 * These fields are used to manage sockets capable of accepting
125 TAILQ_HEAD(, socket) so_incomp; /* in-progress, incomplete */
126 TAILQ_HEAD(, socket) so_comp; /* completed but not yet accepted */
127 TAILQ_ENTRY(socket) so_list; /* list of unaccepted connections */
128 short so_qlen; /* so_comp count */
129 short so_incqlen; /* so_incomp count */
130 short so_qlimit; /* max number queued connections */
133 * Misc socket support
135 short so_timeo; /* connection timeout */
136 u_short so_error; /* error affecting connection */
137 struct sigio *so_sigio; /* information for async I/O or
138 out of band data (SIGURG) */
139 u_long so_oobmark; /* chars to oob mark */
140 TAILQ_HEAD(, aiocblist) so_aiojobq; /* AIO ops waiting on socket */
141 struct signalsockbuf so_rcv;
142 struct signalsockbuf so_snd;
144 void (*so_upcall) (struct socket *, void *, int);
146 struct ucred *so_cred; /* user credentials */
147 /* NB: generation count must not be first; easiest to make it last. */
148 void *so_emuldata; /* private data for emulators */
149 int so_refs; /* shutdown refs */
151 struct accept_filter *so_accept_filter;
152 void *so_accept_filter_arg; /* saved filter args */
153 char *so_accept_filter_str; /* saved user args */
156 struct netmsg_base so_clomsg;
164 * NOTE: The following states are interlocked with so_refs:
166 * SS_NOFDREF so_refs while not set
167 * (so_pcb) so_refs while set
169 #define SS_NOFDREF 0x0001 /* no file table ref any more */
170 #define SS_ISCONNECTED 0x0002 /* socket connected to a peer */
171 #define SS_ISCONNECTING 0x0004 /* in process of connecting to peer */
172 #define SS_ISDISCONNECTING 0x0008 /* in process of disconnecting */
173 #define SS_CANTSENDMORE 0x0010 /* can't send more data to peer */
174 #define SS_CANTRCVMORE 0x0020 /* can't receive more data from peer */
175 #define SS_RCVATMARK 0x0040 /* at mark on input */
177 #define SS_ASSERTINPROG 0x0100 /* sonewconn race debugging */
178 #define SS_ASYNC 0x0200 /* async i/o notify */
179 #define SS_ISCONFIRMING 0x0400 /* deciding to accept connection req */
181 #define SS_INCOMP 0x0800 /* unaccepted, incomplete connection */
182 #define SS_COMP 0x1000 /* unaccepted, complete connection */
183 #define SS_ISDISCONNECTED 0x2000 /* socket disconnected from peer */
186 * Externalized form of struct socket used by the sysctl(3) interface.
189 size_t xso_len; /* length of this structure */
190 struct socket *xso_so; /* makes a convenient handle sometimes */
195 void *so_pcb; /* another convenient handle */
214 uid_t so_uid; /* XXX */
218 * Macros for sockets and socket buffering.
221 #define sosendallatonce(so) \
222 ((so)->so_proto->pr_flags & PR_ATOMIC)
224 /* can we read something from so? */
225 #define soreadable(so) \
226 ((so)->so_rcv.ssb_cc >= (so)->so_rcv.ssb_lowat || \
227 ((so)->so_state & SS_CANTRCVMORE) || \
228 !TAILQ_EMPTY(&(so)->so_comp) || (so)->so_error)
230 /* can we write something to so? */
231 #define sowriteable(so) \
232 ((ssb_space(&(so)->so_snd) >= (so)->so_snd.ssb_lowat && \
233 (((so)->so_state&SS_ISCONNECTED) || \
234 ((so)->so_proto->pr_flags&PR_CONNREQUIRED)==0)) || \
235 ((so)->so_state & SS_CANTSENDMORE) || \
239 * Do we need to notify the other side when I/O is possible?
241 * NOTE: Interlock for ssb_wait/wakeup. The protocol side will set
242 * SSB_WAKEUP asynchronously and this can race, so if it isn't
243 * set we have to go through the full-on notification check.
244 * If it is set but no waiting ever takes place it simply
247 #define ssb_notify(ssb) \
248 (((ssb)->ssb_flags & SSB_NOTIFY_MASK) || \
249 ((ssb)->ssb_flags & SSB_WAKEUP) == 0)
251 /* do we have to send all at once on a socket? */
256 * How much space is there in a socket buffer (so->so_snd or so->so_rcv)?
257 * This is problematical if the fields are unsigned, as the space might
258 * still be negative (cc > hiwat or mbcnt > mbmax). Should detect
259 * overflow and return 0.
261 * SSB_STOP ignores cc/hiwat and returns 0. This is used by unix domain
262 * stream sockets to signal backpressure.
266 ssb_space(struct signalsockbuf *ssb)
271 if (ssb->ssb_flags & SSB_STOP)
273 bleft = ssb->ssb_hiwat - ssb->ssb_cc;
274 mleft = ssb->ssb_mbmax - ssb->ssb_mbcnt;
275 return((bleft < mleft) ? bleft : mleft);
280 #define ssb_append(ssb, m) \
281 sbappend(&(ssb)->sb, m)
283 #define ssb_appendstream(ssb, m) \
284 sbappendstream(&(ssb)->sb, m)
286 #define ssb_appendrecord(ssb, m) \
287 sbappendrecord(&(ssb)->sb, m)
289 #define ssb_appendaddr(ssb, src, m, control) \
290 ((ssb_space(ssb) <= 0) ? 0 : sbappendaddr(&(ssb)->sb, src, m, control))
292 #define ssb_appendcontrol(ssb, m, control) \
293 ((ssb_space(ssb) <= 0) ? 0 : sbappendcontrol(&(ssb)->sb, m, control))
295 #define ssb_insert_knote(ssb, kn) { \
296 knote_insert(&(ssb)->ssb_kq.ki_note, kn); \
297 atomic_set_int(&(ssb)->ssb_flags, SSB_KNOTE); \
300 #define ssb_remove_knote(ssb, kn) { \
301 knote_remove(&(ssb)->ssb_kq.ki_note, kn); \
302 if (SLIST_EMPTY(&(ssb)->ssb_kq.ki_note)) \
303 atomic_clear_int(&(ssb)->ssb_flags, SSB_KNOTE); \
306 #define sorwakeup(so) \
308 if (ssb_notify(&(so)->so_rcv)) \
309 sowakeup((so), &(so)->so_rcv); \
312 #define sowwakeup(so) \
314 if (ssb_notify(&(so)->so_snd)) \
315 sowakeup((so), &(so)->so_snd); \
321 * Argument structure for sosetopt et seq. This is in the KERNEL
322 * section because it will never be visible to user code.
324 enum sopt_dir { SOPT_GET, SOPT_SET };
326 enum sopt_dir sopt_dir; /* is this a get or a set? */
327 int sopt_level; /* second arg of [gs]etsockopt */
328 int sopt_name; /* third arg of [gs]etsockopt */
329 void *sopt_val; /* fourth arg of [gs]etsockopt */
330 size_t sopt_valsize; /* (almost) fifth arg of [gs]etsockopt */
331 struct thread *sopt_td; /* calling thread or null if kernel */
334 struct accept_filter {
336 void (*accf_callback)
337 (struct socket *so, void *arg, int waitflag);
338 void * (*accf_create)
339 (struct socket *so, char *arg);
342 SLIST_ENTRY(accept_filter) accf_next; /* next on the list */
345 #ifdef MALLOC_DECLARE
346 MALLOC_DECLARE(M_PCB);
347 MALLOC_DECLARE(M_SONAME);
348 MALLOC_DECLARE(M_ACCF);
351 extern int maxsockets;
352 extern u_long sb_max; /* nominal limit */
353 extern u_long sb_max_adj; /* actual limit used by sbreserve() */
367 * File operations on sockets.
369 int soo_read (struct file *fp, struct uio *uio, struct ucred *cred,
371 int soo_write (struct file *fp, struct uio *uio, struct ucred *cred,
373 int soo_close (struct file *fp);
374 int soo_shutdown (struct file *fp, int how);
375 int soo_ioctl (struct file *fp, u_long cmd, caddr_t data,
376 struct ucred *cred, struct sysmsg *msg);
377 int soo_stat (struct file *fp, struct stat *ub, struct ucred *cred);
378 int sokqfilter (struct file *fp, struct knote *kn);
381 * From uipc_socket and friends
383 struct sockaddr *dup_sockaddr (const struct sockaddr *sa);
384 int getsockaddr (struct sockaddr **namp, caddr_t uaddr, size_t len);
386 void ssb_release (struct signalsockbuf *ssb, struct socket *so);
387 int ssb_reserve (struct signalsockbuf *ssb, u_long cc, struct socket *so,
389 void ssbtoxsockbuf (struct signalsockbuf *sb, struct xsockbuf *xsb);
390 int ssb_wait (struct signalsockbuf *sb);
391 int _ssb_lock (struct signalsockbuf *sb);
393 void soabort (struct socket *so);
394 void soaborta (struct socket *so);
395 void soabort_oncpu (struct socket *so);
396 int soaccept (struct socket *so, struct sockaddr **nam);
397 struct socket *soalloc (int waitok);
398 int sobind (struct socket *so, struct sockaddr *nam, struct thread *td);
399 void socantrcvmore (struct socket *so);
400 void socantsendmore (struct socket *so);
401 int socket_wait (struct socket *so, struct timespec *ts, int *res);
402 int soclose (struct socket *so, int fflags);
403 int soconnect (struct socket *so, struct sockaddr *nam, struct thread *td);
404 int soconnect2 (struct socket *so1, struct socket *so2);
405 int socreate (int dom, struct socket **aso, int type, int proto,
407 int sodisconnect (struct socket *so);
408 void sofree (struct socket *so);
409 int sogetopt (struct socket *so, struct sockopt *sopt);
410 void sohasoutofband (struct socket *so);
411 void soisconnected (struct socket *so);
412 void soisconnecting (struct socket *so);
413 void soisdisconnected (struct socket *so);
414 void soisdisconnecting (struct socket *so);
415 void soisreconnected (struct socket *so);
416 void soisreconnecting (struct socket *so);
417 void sosetport (struct socket *so, struct lwkt_port *port);
418 int solisten (struct socket *so, int backlog, struct thread *td);
419 struct socket *sonewconn (struct socket *head, int connstatus);
420 int sooptcopyin (struct sockopt *sopt, void *buf, size_t len,
422 int soopt_to_kbuf (struct sockopt *sopt, void *buf, size_t len,
424 int sooptcopyout (struct sockopt *sopt, const void *buf, size_t len);
425 void soopt_from_kbuf (struct sockopt *sopt, const void *buf, size_t len);
427 /* XXX; prepare mbuf for (__FreeBSD__ < 3) routines. */
428 int soopt_getm (struct sockopt *sopt, struct mbuf **mp);
429 int soopt_mcopyin (struct sockopt *sopt, struct mbuf *m);
430 void soopt_to_mbuf (struct sockopt *sopt, struct mbuf *m);
431 int soopt_mcopyout (struct sockopt *sopt, struct mbuf *m);
432 int soopt_from_mbuf (struct sockopt *sopt, struct mbuf *m);
434 int soreceive (struct socket *so, struct sockaddr **paddr,
435 struct uio *uio, struct sockbuf *sio,
436 struct mbuf **controlp, int *flagsp);
437 int soreserve (struct socket *so, u_long sndcc, u_long rcvcc,
439 void sorflush (struct socket *so);
440 int sosend (struct socket *so, struct sockaddr *addr, struct uio *uio,
441 struct mbuf *top, struct mbuf *control, int flags,
443 int sosendudp (struct socket *so, struct sockaddr *addr, struct uio *uio,
444 struct mbuf *top, struct mbuf *control, int flags,
446 int sosendtcp (struct socket *so, struct sockaddr *addr, struct uio *uio,
447 struct mbuf *top, struct mbuf *control, int flags,
449 int sosetopt (struct socket *so, struct sockopt *sopt);
450 int soshutdown (struct socket *so, int how);
451 void sotoxsocket (struct socket *so, struct xsocket *xso);
452 void sowakeup (struct socket *so, struct signalsockbuf *sb);
454 /* accept filter functions */
455 int accept_filt_add (struct accept_filter *filt);
456 int accept_filt_del (char *name);
457 struct accept_filter * accept_filt_get (char *name);
458 #ifdef ACCEPT_FILTER_MOD
459 int accept_filt_generic_mod_event (module_t mod, int event, void *data);
460 SYSCTL_DECL(_net_inet_accf);
461 #endif /* ACCEPT_FILTER_MOD */
465 #endif /* !_SYS_SOCKETVAR_H_ */