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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 1.16 2004/12/15 00:11:04 hsu Exp $
38 #ifndef _SYS_SOCKETVAR_H_
39 #define _SYS_SOCKETVAR_H_
41 #include <sys/queue.h> /* for TAILQ macros */
42 #include <sys/select.h> /* for struct selinfo */
45 * Kernel structure per socket.
46 * Contains send and receive buffer queues,
47 * handle on protocol and pointer to protocol
48 * private data and error information.
50 typedef u_quad_t so_gen_t;
55 short so_type; /* generic type, see socket.h */
56 short so_options; /* from socket call, see socket.h */
57 short so_linger; /* time to linger while closing */
58 short so_state; /* internal state flags SS_*, below */
59 void *so_pcb; /* protocol control block */
60 struct protosw *so_proto; /* protocol handle */
62 * Variables for connection queuing.
63 * Socket where accepts occur is so_head in all subsidiary sockets.
64 * If so_head is 0, socket is not related to an accept.
65 * For head socket so_incomp queues partially completed connections,
66 * while so_comp is a queue of connections ready to be accepted.
67 * If a connection is aborted and it has so_head set, then
68 * it has to be pulled out of either so_incomp or so_comp.
69 * We allow connections to queue up based on current queue lengths
70 * and limit on number of queued connections for this socket.
72 struct socket *so_head; /* back pointer to accept socket */
73 TAILQ_HEAD(, socket) so_incomp; /* queue of partial unaccepted connections */
74 TAILQ_HEAD(, socket) so_comp; /* queue of complete unaccepted connections */
75 TAILQ_ENTRY(socket) so_list; /* list of unaccepted connections */
76 short so_qlen; /* number of unaccepted connections */
77 short so_incqlen; /* number of unaccepted incomplete
79 short so_qlimit; /* max number queued connections */
80 short so_timeo; /* connection timeout */
81 u_short so_error; /* error affecting connection */
82 struct sigio *so_sigio; /* information for async I/O or
83 out of band data (SIGURG) */
84 u_long so_oobmark; /* chars to oob mark */
85 TAILQ_HEAD(, aiocblist) so_aiojobq; /* AIO ops waiting on socket */
87 * Variables for socket buffering.
90 u_long sb_cc; /* actual chars in buffer */
91 u_long sb_hiwat; /* max actual char count */
92 u_long sb_mbcnt; /* chars of mbufs used */
93 u_long sb_mbmax; /* max chars of mbufs to use */
94 long sb_lowat; /* low water mark */
95 struct mbuf *sb_mb; /* the mbuf chain */
96 struct mbuf *sb_lastmbuf; /* last mbuf in sb_mb */
97 struct selinfo sb_sel; /* process selecting read/write */
98 short sb_flags; /* flags, see below */
99 short sb_timeo; /* timeout for read/write */
101 #define SB_MAX (256*1024) /* default for max chars in sockbuf */
102 #define SB_LOCK 0x01 /* lock on data queue */
103 #define SB_WANT 0x02 /* someone is waiting to lock */
104 #define SB_WAIT 0x04 /* someone is waiting for data/space */
105 #define SB_SEL 0x08 /* someone is selecting */
106 #define SB_ASYNC 0x10 /* ASYNC I/O, need signals */
107 #define SB_UPCALL 0x20 /* someone wants an upcall */
108 #define SB_NOINTR 0x40 /* operations not interruptible */
109 #define SB_AIO 0x80 /* AIO operations queued */
110 #define SB_KNOTE 0x100 /* kernel note attached */
111 #define SB_MEVENT 0x200 /* need message event notification */
113 void (*so_upcall) (struct socket *, void *, int);
115 struct ucred *so_cred; /* user credentials */
116 /* NB: generation count must not be first; easiest to make it last. */
117 so_gen_t so_gencnt; /* generation count */
118 void *so_emuldata; /* private data for emulators */
120 struct accept_filter *so_accept_filter;
121 void *so_accept_filter_arg; /* saved filter args */
122 char *so_accept_filter_str; /* saved user args */
129 #define SS_NOFDREF 0x0001 /* no file table ref any more */
130 #define SS_ISCONNECTED 0x0002 /* socket connected to a peer */
131 #define SS_ISCONNECTING 0x0004 /* in process of connecting to peer */
132 #define SS_ISDISCONNECTING 0x0008 /* in process of disconnecting */
133 #define SS_CANTSENDMORE 0x0010 /* can't send more data to peer */
134 #define SS_CANTRCVMORE 0x0020 /* can't receive more data from peer */
135 #define SS_RCVATMARK 0x0040 /* at mark on input */
137 #define SS_NBIO 0x0100 /* non-blocking ops */
138 #define SS_ASYNC 0x0200 /* async i/o notify */
139 #define SS_ISCONFIRMING 0x0400 /* deciding to accept connection req */
141 #define SS_INCOMP 0x0800 /* unaccepted, incomplete connection */
142 #define SS_COMP 0x1000 /* unaccepted, complete connection */
143 #define SS_ISDISCONNECTED 0x2000 /* socket disconnected from peer */
146 * Externalized form of struct socket used by the sysctl(3) interface.
149 size_t xso_len; /* length of this structure */
150 struct socket *xso_so; /* makes a convenient handle sometimes */
155 void *so_pcb; /* another convenient handle */
174 uid_t so_uid; /* XXX */
178 * Macros for sockets and socket buffering.
182 * Do we need to notify the other side when I/O is possible?
184 #define sb_notify(sb) \
186 (SB_WAIT | SB_SEL | SB_ASYNC | SB_UPCALL | SB_AIO | SB_KNOTE | SB_MEVENT)))
189 * How much space is there in a socket buffer (so->so_snd or so->so_rcv)?
190 * This is problematical if the fields are unsigned, as the space might
191 * still be negative (cc > hiwat or mbcnt > mbmax). Should detect
192 * overflow and return 0. Should use "lmin" but it doesn't exist now.
194 #define sbspace(sb) \
195 ((long) imin((int)((sb)->sb_hiwat - (sb)->sb_cc), \
196 (int)((sb)->sb_mbmax - (sb)->sb_mbcnt)))
198 /* do we have to send all at once on a socket? */
199 #define sosendallatonce(so) \
200 ((so)->so_proto->pr_flags & PR_ATOMIC)
202 /* can we read something from so? */
203 #define soreadable(so) \
204 ((so)->so_rcv.sb_cc >= (so)->so_rcv.sb_lowat || \
205 ((so)->so_state & SS_CANTRCVMORE) || \
206 !TAILQ_EMPTY(&(so)->so_comp) || (so)->so_error)
208 /* can we write something to so? */
209 #define sowriteable(so) \
210 ((sbspace(&(so)->so_snd) >= (so)->so_snd.sb_lowat && \
211 (((so)->so_state&SS_ISCONNECTED) || \
212 ((so)->so_proto->pr_flags&PR_CONNREQUIRED)==0)) || \
213 ((so)->so_state & SS_CANTSENDMORE) || \
216 /* adjust counters in sb reflecting allocation of m */
217 #define sballoc(sb, m) { \
218 (sb)->sb_cc += (m)->m_len; \
219 (sb)->sb_mbcnt += MSIZE; \
220 if ((m)->m_flags & M_EXT) \
221 (sb)->sb_mbcnt += (m)->m_ext.ext_size; \
224 /* adjust counters in sb reflecting freeing of m */
225 #define sbfree(sb, m) { \
226 (sb)->sb_cc -= (m)->m_len; \
227 (sb)->sb_mbcnt -= MSIZE; \
228 if ((m)->m_flags & M_EXT) \
229 (sb)->sb_mbcnt -= (m)->m_ext.ext_size; \
233 * Set lock on sockbuf sb; sleep if lock is already held.
234 * Unless SB_NOINTR is set on sockbuf, sleep is interruptible.
235 * Returns error without lock if sleep is interrupted.
237 #define sblock(sb, wf) ((sb)->sb_flags & SB_LOCK ? \
238 (((wf) == M_WAITOK) ? sb_lock(sb) : EWOULDBLOCK) : \
239 ((sb)->sb_flags |= SB_LOCK), 0)
241 /* release lock on sockbuf sb */
242 #define sbunlock(sb) { \
243 (sb)->sb_flags &= ~SB_LOCK; \
244 if ((sb)->sb_flags & SB_WANT) { \
245 (sb)->sb_flags &= ~SB_WANT; \
246 wakeup((caddr_t)&(sb)->sb_flags); \
250 #define sorwakeup(so) do { \
251 if (sb_notify(&(so)->so_rcv)) \
252 sowakeup((so), &(so)->so_rcv); \
255 #define sowwakeup(so) do { \
256 if (sb_notify(&(so)->so_snd)) \
257 sowakeup((so), &(so)->so_snd); \
263 * Argument structure for sosetopt et seq. This is in the KERNEL
264 * section because it will never be visible to user code.
266 enum sopt_dir { SOPT_GET, SOPT_SET };
268 enum sopt_dir sopt_dir; /* is this a get or a set? */
269 int sopt_level; /* second arg of [gs]etsockopt */
270 int sopt_name; /* third arg of [gs]etsockopt */
271 void *sopt_val; /* fourth arg of [gs]etsockopt */
272 size_t sopt_valsize; /* (almost) fifth arg of [gs]etsockopt */
273 struct thread *sopt_td; /* calling thread or null if kernel */
276 struct accept_filter {
278 void (*accf_callback)
279 (struct socket *so, void *arg, int waitflag);
280 void * (*accf_create)
281 (struct socket *so, char *arg);
284 SLIST_ENTRY(accept_filter) accf_next; /* next on the list */
287 #ifdef MALLOC_DECLARE
288 MALLOC_DECLARE(M_PCB);
289 MALLOC_DECLARE(M_SONAME);
290 MALLOC_DECLARE(M_ACCF);
293 extern int maxsockets;
294 extern u_long sb_max; /* nominal limit */
295 extern u_long sb_max_adj; /* actual limit used by sbreserve() */
296 extern struct vm_zone *socket_zone;
297 extern so_gen_t so_gencnt;
310 * File operations on sockets.
312 int soo_read (struct file *fp, struct uio *uio, struct ucred *cred,
313 int flags, struct thread *td);
314 int soo_write (struct file *fp, struct uio *uio, struct ucred *cred,
315 int flags, struct thread *td);
316 int soo_close (struct file *fp, struct thread *td);
317 int soo_ioctl (struct file *fp, u_long cmd, caddr_t data,
319 int soo_poll (struct file *fp, int events, struct ucred *cred,
321 int soo_stat (struct file *fp, struct stat *ub, struct thread *td);
322 int sokqfilter (struct file *fp, struct knote *kn);
325 * From uipc_socket and friends
327 struct sockaddr *dup_sockaddr (struct sockaddr *sa);
328 int holdsock (struct filedesc *fdp, int fdes, struct file **fpp);
329 int getsockaddr (struct sockaddr **namp, caddr_t uaddr, size_t len);
330 void sbappend (struct sockbuf *sb, struct mbuf *m);
331 int sbappendaddr (struct sockbuf *sb, struct sockaddr *asa,
332 struct mbuf *m0, struct mbuf *control);
333 int sbappendcontrol (struct sockbuf *sb, struct mbuf *m0,
334 struct mbuf *control);
335 void sbappendrecord (struct sockbuf *sb, struct mbuf *m0);
336 void sbappendstream (struct sockbuf *sb, struct mbuf *m);
337 void sbcheck (struct sockbuf *sb);
338 void sbcompress (struct sockbuf *sb, struct mbuf *m, struct mbuf *n);
340 sbcreatecontrol (caddr_t p, int size, int type, int level);
341 void sbdrop (struct sockbuf *sb, int len);
342 void sbdroprecord (struct sockbuf *sb);
343 void sbflush (struct sockbuf *sb);
344 void sbinsertoob (struct sockbuf *sb, struct mbuf *m0);
345 void sbrelease (struct sockbuf *sb, struct socket *so);
346 int sbreserve (struct sockbuf *sb, u_long cc, struct socket *so,
348 void sbtoxsockbuf (struct sockbuf *sb, struct xsockbuf *xsb);
349 int sbwait (struct sockbuf *sb);
350 int sb_lock (struct sockbuf *sb);
351 int soabort (struct socket *so);
352 int soaccept (struct socket *so, struct sockaddr **nam);
353 struct socket *soalloc (int waitok);
354 int sobind (struct socket *so, struct sockaddr *nam, struct thread *td);
355 void socantrcvmore (struct socket *so);
356 void socantsendmore (struct socket *so);
357 int soclose (struct socket *so);
358 int soconnect (struct socket *so, struct sockaddr *nam, struct thread *td);
359 int soconnect2 (struct socket *so1, struct socket *so2);
360 int socreate (int dom, struct socket **aso, int type, int proto,
362 void sodealloc (struct socket *so);
363 int sodisconnect (struct socket *so);
364 void sofree (struct socket *so);
365 int sogetopt (struct socket *so, struct sockopt *sopt);
366 void sohasoutofband (struct socket *so);
367 void soisconnected (struct socket *so);
368 void soisconnecting (struct socket *so);
369 void soisdisconnected (struct socket *so);
370 void soisdisconnecting (struct socket *so);
371 int solisten (struct socket *so, int backlog, struct thread *td);
372 struct socket *sonewconn (struct socket *head, int connstatus);
373 int sooptcopyin (struct sockopt *sopt, void *buf, size_t len,
375 int sooptcopyout (struct sockopt *sopt, const void *buf, size_t len);
377 /* XXX; prepare mbuf for (__FreeBSD__ < 3) routines. */
378 int soopt_getm (struct sockopt *sopt, struct mbuf **mp);
379 int soopt_mcopyin (struct sockopt *sopt, struct mbuf *m);
380 int soopt_mcopyout (struct sockopt *sopt, struct mbuf *m);
382 int sopoll (struct socket *so, int events, struct ucred *cred,
384 int soreceive (struct socket *so, struct sockaddr **paddr,
385 struct uio *uio, struct mbuf **mp0,
386 struct mbuf **controlp, int *flagsp);
387 int soreserve (struct socket *so, u_long sndcc, u_long rcvcc,
389 void sorflush (struct socket *so);
390 int sosend (struct socket *so, struct sockaddr *addr, struct uio *uio,
391 struct mbuf *top, struct mbuf *control, int flags,
393 int sosendudp (struct socket *so, struct sockaddr *addr, struct uio *uio,
394 struct mbuf *top, struct mbuf *control, int flags,
396 int sosetopt (struct socket *so, struct sockopt *sopt);
397 int soshutdown (struct socket *so, int how);
398 void sotoxsocket (struct socket *so, struct xsocket *xso);
399 void sowakeup (struct socket *so, struct sockbuf *sb);
401 /* accept filter functions */
402 int accept_filt_add (struct accept_filter *filt);
403 int accept_filt_del (char *name);
404 struct accept_filter * accept_filt_get (char *name);
405 #ifdef ACCEPT_FILTER_MOD
406 int accept_filt_generic_mod_event (module_t mod, int event, void *data);
407 SYSCTL_DECL(_net_inet_accf);
408 #endif /* ACCEPT_FILTER_MOD */
412 #endif /* !_SYS_SOCKETVAR_H_ */