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29 * @(#)socketvar.h 8.3 (Berkeley) 2/19/95
30 * $FreeBSD: src/sys/sys/socketvar.h,v 1.46.2.10 2003/08/24 08:24:39 hsu Exp $
31 * $DragonFly: src/sys/sys/socketvar.h,v 1.35 2008/08/28 23:15:45 dillon Exp $
34 #ifndef _SYS_SOCKETVAR_H_
35 #define _SYS_SOCKETVAR_H_
38 #include <sys/types.h>
41 #include <sys/queue.h> /* for TAILQ macros */
44 #include <sys/event.h> /* for struct kqinfo */
46 #ifndef _SYS_THREAD_H_
47 #include <sys/thread.h> /* for struct lwkt_token */
49 #ifndef _SYS_SOCKBUF_H_
50 #include <sys/sockbuf.h>
53 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
55 #ifndef _NET_NETMSG_H_
56 #include <net/netmsg.h>
59 #ifndef _SYS_SPINLOCK_H_
60 #include <sys/spinlock.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 struct notifymsglist ssb_mlist; /* list of pending predicate messages */
76 uint32_t ssb_flags; /* flags, see below (use atomic ops) */
77 u_int ssb_timeo; /* timeout for read/write */
78 long ssb_lowat; /* low water mark */
79 u_long ssb_hiwat; /* high water mark / max actual char count */
80 u_long ssb_mbmax; /* max chars of mbufs to use */
81 struct lwkt_token ssb_token; /* frontend/backend serializer */
84 #define ssb_cc sb.sb_cc /* commonly used fields */
85 #define ssb_mb sb.sb_mb /* commonly used fields */
86 #define ssb_mbcnt sb.sb_mbcnt /* commonly used fields */
87 #define ssb_cc_prealloc sb.sb_cc_prealloc
88 #define ssb_mbcnt_prealloc sb.sb_mbcnt_prealloc
90 #define SSB_LOCK 0x0001 /* lock on data queue */
91 #define SSB_WANT 0x0002 /* someone is waiting to lock */
92 #define SSB_WAIT 0x0004 /* someone is waiting for data/space */
93 #define SSB_ASYNC 0x0010 /* ASYNC I/O, need signals */
94 #define SSB_UPCALL 0x0020 /* someone wants an upcall */
95 #define SSB_NOINTR 0x0040 /* operations not interruptible */
96 /*#define SSB_AIO 0x0080*/ /* AIO operations queued */
97 #define SSB_KNOTE 0x0100 /* kernel note attached */
98 #define SSB_MEVENT 0x0200 /* need message event notification */
99 #define SSB_STOP 0x0400 /* backpressure indicator */
100 #define SSB_AUTOSIZE 0x0800 /* automatically size socket buffer */
101 #define SSB_AUTOLOWAT 0x1000 /* automatically scale lowat */
102 #define SSB_WAKEUP 0x2000 /* wakeup event race */
103 #define SSB_PREALLOC 0x4000 /* prealloc supported */
104 #define SSB_STOPSUPP 0x8000 /* SSB_STOP supported */
106 #define SSB_CLEAR_MASK (SSB_ASYNC | SSB_UPCALL | SSB_STOP | \
107 SSB_AUTOSIZE | SSB_AUTOLOWAT)
109 #define SSB_NOTIFY_MASK (SSB_WAIT | SSB_ASYNC | SSB_UPCALL | \
110 SSB_KNOTE | SSB_MEVENT)
113 * Per-socket kernel structure. Contains universal send and receive queues,
114 * protocol control handle, and error information.
117 short so_type; /* generic type, see socket.h */
118 short so_options; /* from socket call, see socket.h */
119 short so_linger; /* time to linger while closing */
120 short so_state; /* internal state flags SS_*, below */
121 void *so_pcb; /* protocol control block */
122 struct protosw *so_proto; /* protocol handle */
123 struct socket *so_head; /* back pointer to accept socket */
124 lwkt_port_t so_port; /* message port */
127 * These fields are used to manage sockets capable of accepting
130 TAILQ_HEAD(, socket) so_incomp; /* in-progress, incomplete */
131 TAILQ_HEAD(, socket) so_comp; /* completed but not yet accepted */
132 TAILQ_ENTRY(socket) so_list; /* list of unaccepted connections */
133 short so_qlen; /* so_comp count */
134 short so_incqlen; /* so_incomp count */
135 short so_qlimit; /* max number queued connections */
138 * Misc socket support
140 short so_timeo; /* connection timeout */
141 u_short so_error; /* error affecting connection */
142 struct sigio *so_sigio; /* information for async I/O or
143 out of band data (SIGURG) */
144 u_long so_oobmark; /* chars to oob mark */
145 TAILQ_HEAD(, aiocblist) so_aiojobq; /* AIO ops waiting on socket */
146 struct signalsockbuf so_rcv;
147 struct signalsockbuf so_snd;
149 void (*so_upcall) (struct socket *, void *, int);
151 struct ucred *so_cred; /* user credentials */
152 /* NB: generation count must not be first; easiest to make it last. */
153 void *so_emuldata; /* private data for emulators */
154 int so_refs; /* shutdown refs */
157 struct accept_filter *so_accept_filter;
158 void *so_accept_filter_arg; /* saved filter args */
159 char *so_accept_filter_str; /* saved user args */
162 struct netmsg_base so_clomsg;
163 struct sockaddr *so_faddr;
165 struct spinlock so_rcvd_spin;
166 struct netmsg_pru_rcvd so_rcvd_msg;
168 lwkt_port_t so_orig_port;
178 * NOTE: The following states are interlocked with so_refs:
180 * SS_NOFDREF so_refs while not set
181 * (so_pcb) so_refs while set
183 #define SS_NOFDREF 0x0001 /* no file table ref any more */
184 #define SS_ISCONNECTED 0x0002 /* socket connected to a peer */
185 #define SS_ISCONNECTING 0x0004 /* in process of connecting to peer */
186 #define SS_ISDISCONNECTING 0x0008 /* in process of disconnecting */
187 #define SS_CANTSENDMORE 0x0010 /* can't send more data to peer */
188 #define SS_CANTRCVMORE 0x0020 /* can't receive more data from peer */
189 #define SS_RCVATMARK 0x0040 /* at mark on input */
191 #define SS_ISCLOSING 0x0080 /* in process of closing */
192 #define SS_ASSERTINPROG 0x0100 /* sonewconn race debugging */
193 #define SS_ASYNC 0x0200 /* async i/o notify */
194 #define SS_ISCONFIRMING 0x0400 /* deciding to accept connection req */
196 #define SS_INCOMP 0x0800 /* unaccepted, incomplete connection */
197 #define SS_COMP 0x1000 /* unaccepted, complete connection */
198 #define SS_ISDISCONNECTED 0x2000 /* socket disconnected from peer */
199 #define SS_ACCEPTMECH 0x4000 /* allow bind override vs accepted */
202 * Externalized form of struct socket used by the sysctl(3) interface.
205 size_t xso_len; /* length of this structure */
206 struct socket *xso_so; /* makes a convenient handle sometimes */
211 void *so_pcb; /* another convenient handle */
230 uid_t so_uid; /* XXX */
234 * Macros for sockets and socket buffering.
237 #define sosendallatonce(so) \
238 ((so)->so_proto->pr_flags & PR_ATOMIC)
240 /* can we read something from so? */
241 #define soreadable(so) \
242 ((so)->so_rcv.ssb_cc >= (so)->so_rcv.ssb_lowat || \
243 ((so)->so_state & SS_CANTRCVMORE) || \
244 !TAILQ_EMPTY(&(so)->so_comp) || (so)->so_error)
246 /* can we write something to so? */
247 #define sowriteable(so) \
248 ((ssb_space(&(so)->so_snd) >= (so)->so_snd.ssb_lowat && \
249 (((so)->so_state&SS_ISCONNECTED) || \
250 ((so)->so_proto->pr_flags&PR_CONNREQUIRED)==0)) || \
251 ((so)->so_state & SS_CANTSENDMORE) || \
254 /* do we have to send all at once on a socket? */
259 * How much space is there in a socket buffer (so->so_snd or so->so_rcv)?
260 * This is problematical if the fields are unsigned, as the space might
261 * still be negative (cc > hiwat or mbcnt > mbmax). Should detect
262 * overflow and return 0.
264 * SSB_STOP ignores cc/hiwat and returns 0. This is used by unix domain
265 * stream sockets to signal backpressure.
269 ssb_space(struct signalsockbuf *ssb)
274 if (ssb->ssb_flags & SSB_STOP)
276 bleft = ssb->ssb_hiwat - ssb->ssb_cc;
277 mleft = ssb->ssb_mbmax - ssb->ssb_mbcnt;
278 return((bleft < mleft) ? bleft : mleft);
282 ssb_space_prealloc(struct signalsockbuf *ssb)
284 long bleft, bleft_prealloc;
285 long mleft, mleft_prealloc;
287 if (ssb->ssb_flags & SSB_STOP)
290 bleft = ssb->ssb_hiwat - ssb->ssb_cc;
291 bleft_prealloc = ssb->ssb_hiwat - ssb->ssb_cc_prealloc;
292 if (bleft_prealloc < bleft)
293 bleft = bleft_prealloc;
295 mleft = ssb->ssb_mbmax - ssb->ssb_mbcnt;
296 mleft_prealloc = ssb->ssb_mbmax - ssb->ssb_mbcnt_prealloc;
297 if (mleft_prealloc < mleft)
298 mleft = mleft_prealloc;
300 return((bleft < mleft) ? bleft : mleft);
304 * NOTE: Only works w/ later ssb_appendstream() on m
307 ssb_preallocstream(struct signalsockbuf *ssb, struct mbuf *m)
311 sbprealloc(&ssb->sb, m);
316 #define ssb_append(ssb, m) \
317 sbappend(&(ssb)->sb, m)
319 #define ssb_appendstream(ssb, m) \
320 sbappendstream(&(ssb)->sb, m)
322 #define ssb_appendrecord(ssb, m) \
323 sbappendrecord(&(ssb)->sb, m)
325 #define ssb_appendaddr(ssb, src, m, control) \
326 ((ssb_space(ssb) <= 0) ? 0 : sbappendaddr(&(ssb)->sb, src, m, control))
328 #define ssb_appendcontrol(ssb, m, control) \
329 ((ssb_space(ssb) <= 0) ? 0 : sbappendcontrol(&(ssb)->sb, m, control))
331 #define ssb_insert_knote(ssb, kn) do { \
332 knote_insert(&(ssb)->ssb_kq.ki_note, kn); \
333 atomic_set_int(&(ssb)->ssb_flags, SSB_KNOTE); \
336 #define ssb_remove_knote(ssb, kn) do { \
337 knote_remove(&(ssb)->ssb_kq.ki_note, kn); \
338 if (SLIST_EMPTY(&(ssb)->ssb_kq.ki_note)) \
339 atomic_clear_int(&(ssb)->ssb_flags, SSB_KNOTE); \
342 #define sorwakeup(so) sowakeup((so), &(so)->so_rcv)
343 #define sowwakeup(so) sowakeup((so), &(so)->so_snd)
348 * Argument structure for sosetopt et seq. This is in the KERNEL
349 * section because it will never be visible to user code.
351 enum sopt_dir { SOPT_GET, SOPT_SET };
353 enum sopt_dir sopt_dir; /* is this a get or a set? */
354 int sopt_level; /* second arg of [gs]etsockopt */
355 int sopt_name; /* third arg of [gs]etsockopt */
356 void *sopt_val; /* fourth arg of [gs]etsockopt */
357 size_t sopt_valsize; /* (almost) fifth arg of [gs]etsockopt */
358 struct thread *sopt_td; /* calling thread or null if kernel */
361 struct accept_filter {
363 void (*accf_callback)
364 (struct socket *so, void *arg, int waitflag);
365 void * (*accf_create)
366 (struct socket *so, char *arg);
369 SLIST_ENTRY(accept_filter) accf_next; /* next on the list */
372 #ifdef MALLOC_DECLARE
373 MALLOC_DECLARE(M_PCB);
374 MALLOC_DECLARE(M_SONAME);
375 MALLOC_DECLARE(M_ACCF);
378 extern int maxsockets;
379 extern u_long sb_max; /* nominal limit */
380 extern u_long sb_max_adj; /* actual limit used by sbreserve() */
394 * File operations on sockets.
396 int soo_read (struct file *fp, struct uio *uio, struct ucred *cred,
398 int soo_write (struct file *fp, struct uio *uio, struct ucred *cred,
400 int soo_close (struct file *fp);
401 int soo_shutdown (struct file *fp, int how);
402 int soo_ioctl (struct file *fp, u_long cmd, caddr_t data,
403 struct ucred *cred, struct sysmsg *msg);
404 int soo_stat (struct file *fp, struct stat *ub, struct ucred *cred);
405 int sokqfilter (struct file *fp, struct knote *kn);
408 * From uipc_socket and friends
410 struct sockaddr *dup_sockaddr (const struct sockaddr *sa);
411 int getsockaddr (struct sockaddr **namp, caddr_t uaddr, size_t len);
413 void ssb_release (struct signalsockbuf *ssb, struct socket *so);
414 int ssb_reserve (struct signalsockbuf *ssb, u_long cc, struct socket *so,
416 void ssbtoxsockbuf (struct signalsockbuf *sb, struct xsockbuf *xsb);
417 int ssb_wait (struct signalsockbuf *sb);
418 int _ssb_lock (struct signalsockbuf *sb);
420 void soabort_async (struct socket *so, boolean_t clr_head);
421 void soabort_direct (struct socket *so);
422 int soaccept (struct socket *so, struct sockaddr **nam);
423 void soaccept_generic (struct socket *so);
424 struct socket *soalloc (int waitok, struct protosw *);
425 int sobind (struct socket *so, struct sockaddr *nam, struct thread *td);
426 void socantrcvmore (struct socket *so);
427 void socantsendmore (struct socket *so);
428 int socket_wait (struct socket *so, struct timespec *ts, int *res);
429 int soclose (struct socket *so, int fflags);
430 int soconnect (struct socket *so, struct sockaddr *nam, struct thread *td,
432 int soconnect2 (struct socket *so1, struct socket *so2);
433 int socreate (int dom, struct socket **aso, int type, int proto,
435 int sodisconnect (struct socket *so);
436 void sodiscard (struct socket *so);
437 void sofree (struct socket *so);
438 int sogetopt (struct socket *so, struct sockopt *sopt);
439 void sohasoutofband (struct socket *so);
440 void soisconnected (struct socket *so);
441 void soisconnecting (struct socket *so);
442 void soisdisconnected (struct socket *so);
443 void soisdisconnecting (struct socket *so);
444 void soisreconnected (struct socket *so);
445 void soisreconnecting (struct socket *so);
446 void sosetport (struct socket *so, struct lwkt_port *port);
447 int solisten (struct socket *so, int backlog, struct thread *td);
448 struct socket *sonewconn (struct socket *head, int connstatus);
449 struct socket *sonewconn_faddr (struct socket *head, int connstatus,
450 const struct sockaddr *faddr, boolean_t keep_ref);
451 void soinherit(struct socket *so, struct socket *so_inh);
452 int sooptcopyin (struct sockopt *sopt, void *buf, size_t len,
454 int soopt_to_kbuf (struct sockopt *sopt, void *buf, size_t len,
456 int sooptcopyout (struct sockopt *sopt, const void *buf, size_t len);
457 void soopt_from_kbuf (struct sockopt *sopt, const void *buf, size_t len);
459 /* XXX; prepare mbuf for (__FreeBSD__ < 3) routines. */
460 int soopt_getm (struct sockopt *sopt, struct mbuf **mp);
461 int soopt_mcopyin (struct sockopt *sopt, struct mbuf *m);
462 void soopt_to_mbuf (struct sockopt *sopt, struct mbuf *m);
463 int soopt_mcopyout (struct sockopt *sopt, struct mbuf *m);
464 int soopt_from_mbuf (struct sockopt *sopt, struct mbuf *m);
466 int soreceive (struct socket *so, struct sockaddr **paddr,
467 struct uio *uio, struct sockbuf *sio,
468 struct mbuf **controlp, int *flagsp);
469 int sorecvtcp (struct socket *so, struct sockaddr **paddr,
470 struct uio *uio, struct sockbuf *sio,
471 struct mbuf **controlp, int *flagsp);
472 int soreserve (struct socket *so, u_long sndcc, u_long rcvcc,
474 void sorflush (struct socket *so);
475 int sosend (struct socket *so, struct sockaddr *addr, struct uio *uio,
476 struct mbuf *top, struct mbuf *control, int flags,
478 int sosendudp (struct socket *so, struct sockaddr *addr, struct uio *uio,
479 struct mbuf *top, struct mbuf *control, int flags,
481 int sosendtcp (struct socket *so, struct sockaddr *addr, struct uio *uio,
482 struct mbuf *top, struct mbuf *control, int flags,
484 int sosetopt (struct socket *so, struct sockopt *sopt);
485 int soshutdown (struct socket *so, int how);
486 void sotoxsocket (struct socket *so, struct xsocket *xso);
487 void sowakeup (struct socket *so, struct signalsockbuf *sb);
489 /* accept filter functions */
490 int accept_filt_add (struct accept_filter *filt);
491 int accept_filt_del (char *name);
492 struct accept_filter * accept_filt_get (char *name);
493 #ifdef ACCEPT_FILTER_MOD
494 int accept_filt_generic_mod_event (module_t mod, int event, void *data);
495 SYSCTL_DECL(_net_inet_accf);
496 #endif /* ACCEPT_FILTER_MOD */
500 #endif /* !_SYS_SOCKETVAR_H_ */