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33 * @(#)socketvar.h 8.3 (Berkeley) 2/19/95
34 * $FreeBSD: src/sys/sys/socketvar.h,v 1.46.2.9 2002/08/14 22:23:10 dg Exp $
37 #ifndef _SYS_SOCKETVAR_H_
38 #define _SYS_SOCKETVAR_H_
40 #include <sys/queue.h> /* for TAILQ macros */
41 #include <sys/select.h> /* for struct selinfo */
44 * Kernel structure per socket.
45 * Contains send and receive buffer queues,
46 * handle on protocol and pointer to protocol
47 * private data and error information.
49 typedef u_quad_t so_gen_t;
54 short so_type; /* generic type, see socket.h */
55 short so_options; /* from socket call, see socket.h */
56 short so_linger; /* time to linger while closing */
57 short so_state; /* internal state flags SS_*, below */
58 caddr_t so_pcb; /* protocol control block */
59 struct protosw *so_proto; /* protocol handle */
61 * Variables for connection queuing.
62 * Socket where accepts occur is so_head in all subsidiary sockets.
63 * If so_head is 0, socket is not related to an accept.
64 * For head socket so_incomp queues partially completed connections,
65 * while so_comp is a queue of connections ready to be accepted.
66 * If a connection is aborted and it has so_head set, then
67 * it has to be pulled out of either so_incomp or so_comp.
68 * We allow connections to queue up based on current queue lengths
69 * and limit on number of queued connections for this socket.
71 struct socket *so_head; /* back pointer to accept socket */
72 TAILQ_HEAD(, socket) so_incomp; /* queue of partial unaccepted connections */
73 TAILQ_HEAD(, socket) so_comp; /* queue of complete unaccepted connections */
74 TAILQ_ENTRY(socket) so_list; /* list of unaccepted connections */
75 short so_qlen; /* number of unaccepted connections */
76 short so_incqlen; /* number of unaccepted incomplete
78 short so_qlimit; /* max number queued connections */
79 short so_timeo; /* connection timeout */
80 u_short so_error; /* error affecting connection */
81 struct sigio *so_sigio; /* information for async I/O or
82 out of band data (SIGURG) */
83 u_long so_oobmark; /* chars to oob mark */
84 TAILQ_HEAD(, aiocblist) so_aiojobq; /* AIO ops waiting on socket */
86 * Variables for socket buffering.
89 u_long sb_cc; /* actual chars in buffer */
90 u_long sb_hiwat; /* max actual char count */
91 u_long sb_mbcnt; /* chars of mbufs used */
92 u_long sb_mbmax; /* max chars of mbufs to use */
93 long sb_lowat; /* low water mark */
94 struct mbuf *sb_mb; /* the mbuf chain */
95 struct selinfo sb_sel; /* process selecting read/write */
96 short sb_flags; /* flags, see below */
97 short sb_timeo; /* timeout for read/write */
99 #define SB_MAX (256*1024) /* default for max chars in sockbuf */
100 #define SB_LOCK 0x01 /* lock on data queue */
101 #define SB_WANT 0x02 /* someone is waiting to lock */
102 #define SB_WAIT 0x04 /* someone is waiting for data/space */
103 #define SB_SEL 0x08 /* someone is selecting */
104 #define SB_ASYNC 0x10 /* ASYNC I/O, need signals */
105 #define SB_UPCALL 0x20 /* someone wants an upcall */
106 #define SB_NOINTR 0x40 /* operations not interruptible */
107 #define SB_AIO 0x80 /* AIO operations queued */
108 #define SB_KNOTE 0x100 /* kernel note attached */
110 void (*so_upcall) __P((struct socket *, void *, int));
112 struct ucred *so_cred; /* user credentials */
113 /* NB: generation count must not be first; easiest to make it last. */
114 so_gen_t so_gencnt; /* generation count */
115 void *so_emuldata; /* private data for emulators */
117 struct accept_filter *so_accept_filter;
118 void *so_accept_filter_arg; /* saved filter args */
119 char *so_accept_filter_str; /* saved user args */
126 #define SS_NOFDREF 0x0001 /* no file table ref any more */
127 #define SS_ISCONNECTED 0x0002 /* socket connected to a peer */
128 #define SS_ISCONNECTING 0x0004 /* in process of connecting to peer */
129 #define SS_ISDISCONNECTING 0x0008 /* in process of disconnecting */
130 #define SS_CANTSENDMORE 0x0010 /* can't send more data to peer */
131 #define SS_CANTRCVMORE 0x0020 /* can't receive more data from peer */
132 #define SS_RCVATMARK 0x0040 /* at mark on input */
134 #define SS_NBIO 0x0100 /* non-blocking ops */
135 #define SS_ASYNC 0x0200 /* async i/o notify */
136 #define SS_ISCONFIRMING 0x0400 /* deciding to accept connection req */
138 #define SS_INCOMP 0x0800 /* unaccepted, incomplete connection */
139 #define SS_COMP 0x1000 /* unaccepted, complete connection */
140 #define SS_ISDISCONNECTED 0x2000 /* socket disconnected from peer */
143 * Externalized form of struct socket used by the sysctl(3) interface.
146 size_t xso_len; /* length of this structure */
147 struct socket *xso_so; /* makes a convenient handle sometimes */
152 caddr_t so_pcb; /* another convenient handle */
171 uid_t so_uid; /* XXX */
175 * Macros for sockets and socket buffering.
179 * Do we need to notify the other side when I/O is possible?
181 #define sb_notify(sb) (((sb)->sb_flags & (SB_WAIT | SB_SEL | SB_ASYNC | \
182 SB_UPCALL | SB_AIO | SB_KNOTE)) != 0)
185 * How much space is there in a socket buffer (so->so_snd or so->so_rcv)?
186 * This is problematical if the fields are unsigned, as the space might
187 * still be negative (cc > hiwat or mbcnt > mbmax). Should detect
188 * overflow and return 0. Should use "lmin" but it doesn't exist now.
190 #define sbspace(sb) \
191 ((long) imin((int)((sb)->sb_hiwat - (sb)->sb_cc), \
192 (int)((sb)->sb_mbmax - (sb)->sb_mbcnt)))
194 /* do we have to send all at once on a socket? */
195 #define sosendallatonce(so) \
196 ((so)->so_proto->pr_flags & PR_ATOMIC)
198 /* can we read something from so? */
199 #define soreadable(so) \
200 ((so)->so_rcv.sb_cc >= (so)->so_rcv.sb_lowat || \
201 ((so)->so_state & SS_CANTRCVMORE) || \
202 (so)->so_comp.tqh_first || (so)->so_error)
204 /* can we write something to so? */
205 #define sowriteable(so) \
206 ((sbspace(&(so)->so_snd) >= (so)->so_snd.sb_lowat && \
207 (((so)->so_state&SS_ISCONNECTED) || \
208 ((so)->so_proto->pr_flags&PR_CONNREQUIRED)==0)) || \
209 ((so)->so_state & SS_CANTSENDMORE) || \
212 /* adjust counters in sb reflecting allocation of m */
213 #define sballoc(sb, m) { \
214 (sb)->sb_cc += (m)->m_len; \
215 (sb)->sb_mbcnt += MSIZE; \
216 if ((m)->m_flags & M_EXT) \
217 (sb)->sb_mbcnt += (m)->m_ext.ext_size; \
220 /* adjust counters in sb reflecting freeing of m */
221 #define sbfree(sb, m) { \
222 (sb)->sb_cc -= (m)->m_len; \
223 (sb)->sb_mbcnt -= MSIZE; \
224 if ((m)->m_flags & M_EXT) \
225 (sb)->sb_mbcnt -= (m)->m_ext.ext_size; \
229 * Set lock on sockbuf sb; sleep if lock is already held.
230 * Unless SB_NOINTR is set on sockbuf, sleep is interruptible.
231 * Returns error without lock if sleep is interrupted.
233 #define sblock(sb, wf) ((sb)->sb_flags & SB_LOCK ? \
234 (((wf) == M_WAITOK) ? sb_lock(sb) : EWOULDBLOCK) : \
235 ((sb)->sb_flags |= SB_LOCK), 0)
237 /* release lock on sockbuf sb */
238 #define sbunlock(sb) { \
239 (sb)->sb_flags &= ~SB_LOCK; \
240 if ((sb)->sb_flags & SB_WANT) { \
241 (sb)->sb_flags &= ~SB_WANT; \
242 wakeup((caddr_t)&(sb)->sb_flags); \
246 #define sorwakeup(so) do { \
247 if (sb_notify(&(so)->so_rcv)) \
248 sowakeup((so), &(so)->so_rcv); \
251 #define sowwakeup(so) do { \
252 if (sb_notify(&(so)->so_snd)) \
253 sowakeup((so), &(so)->so_snd); \
259 * Argument structure for sosetopt et seq. This is in the KERNEL
260 * section because it will never be visible to user code.
262 enum sopt_dir { SOPT_GET, SOPT_SET };
264 enum sopt_dir sopt_dir; /* is this a get or a set? */
265 int sopt_level; /* second arg of [gs]etsockopt */
266 int sopt_name; /* third arg of [gs]etsockopt */
267 void *sopt_val; /* fourth arg of [gs]etsockopt */
268 size_t sopt_valsize; /* (almost) fifth arg of [gs]etsockopt */
269 struct proc *sopt_p; /* calling process or null if kernel */
273 SLIST_ENTRY(sf_buf) free_list; /* list of free buffer slots */
274 int refcnt; /* reference count */
275 struct vm_page *m; /* currently mapped page */
276 vm_offset_t kva; /* va of mapping */
279 struct accept_filter {
281 void (*accf_callback)
282 __P((struct socket *so, void *arg, int waitflag));
283 void * (*accf_create)
284 __P((struct socket *so, char *arg));
286 __P((struct socket *so));
287 SLIST_ENTRY(accept_filter) accf_next; /* next on the list */
290 #ifdef MALLOC_DECLARE
291 MALLOC_DECLARE(M_PCB);
292 MALLOC_DECLARE(M_SONAME);
293 MALLOC_DECLARE(M_ACCF);
296 extern int maxsockets;
297 extern u_long sb_max;
298 extern struct vm_zone *socket_zone;
299 extern so_gen_t so_gencnt;
311 * File operations on sockets.
313 int soo_read __P((struct file *fp, struct uio *uio, struct ucred *cred,
314 int flags, struct proc *p));
315 int soo_write __P((struct file *fp, struct uio *uio, struct ucred *cred,
316 int flags, struct proc *p));
317 int soo_close __P((struct file *fp, struct proc *p));
318 int soo_ioctl __P((struct file *fp, u_long cmd, caddr_t data,
320 int soo_poll __P((struct file *fp, int events, struct ucred *cred,
322 int soo_stat __P((struct file *fp, struct stat *ub, struct proc *p));
323 int sokqfilter __P((struct file *fp, struct knote *kn));
326 * From uipc_socket and friends
328 struct sockaddr *dup_sockaddr __P((struct sockaddr *sa, int canwait));
329 int holdsock __P((struct filedesc *fdp, int fdes, struct file **fpp));
330 int sockargs __P((struct mbuf **mp, caddr_t buf, int buflen, int type));
331 int getsockaddr __P((struct sockaddr **namp, caddr_t uaddr, size_t len));
332 void sbappend __P((struct sockbuf *sb, struct mbuf *m));
333 int sbappendaddr __P((struct sockbuf *sb, struct sockaddr *asa,
334 struct mbuf *m0, struct mbuf *control));
335 int sbappendcontrol __P((struct sockbuf *sb, struct mbuf *m0,
336 struct mbuf *control));
337 void sbappendrecord __P((struct sockbuf *sb, struct mbuf *m0));
338 void sbcheck __P((struct sockbuf *sb));
339 void sbcompress __P((struct sockbuf *sb, struct mbuf *m, struct mbuf *n));
341 sbcreatecontrol __P((caddr_t p, int size, int type, int level));
342 void sbdrop __P((struct sockbuf *sb, int len));
343 void sbdroprecord __P((struct sockbuf *sb));
344 void sbflush __P((struct sockbuf *sb));
345 void sbinsertoob __P((struct sockbuf *sb, struct mbuf *m0));
346 void sbrelease __P((struct sockbuf *sb, struct socket *so));
347 int sbreserve __P((struct sockbuf *sb, u_long cc, struct socket *so,
349 void sbtoxsockbuf __P((struct sockbuf *sb, struct xsockbuf *xsb));
350 int sbwait __P((struct sockbuf *sb));
351 int sb_lock __P((struct sockbuf *sb));
354 void sf_buf_free(caddr_t addr, u_int size);
355 void sf_buf_ref(caddr_t addr, u_int size);
356 int soabort __P((struct socket *so));
357 int soaccept __P((struct socket *so, struct sockaddr **nam));
358 struct socket *soalloc __P((int waitok));
359 int sobind __P((struct socket *so, struct sockaddr *nam, struct proc *p));
360 void socantrcvmore __P((struct socket *so));
361 void socantsendmore __P((struct socket *so));
362 int soclose __P((struct socket *so));
363 int soconnect __P((struct socket *so, struct sockaddr *nam, struct proc *p));
364 int soconnect2 __P((struct socket *so1, struct socket *so2));
365 int socreate __P((int dom, struct socket **aso, int type, int proto,
367 void sodealloc __P((struct socket *so));
368 int sodisconnect __P((struct socket *so));
369 void sofree __P((struct socket *so));
370 int sogetopt __P((struct socket *so, struct sockopt *sopt));
371 void sohasoutofband __P((struct socket *so));
372 void soisconnected __P((struct socket *so));
373 void soisconnecting __P((struct socket *so));
374 void soisdisconnected __P((struct socket *so));
375 void soisdisconnecting __P((struct socket *so));
376 int solisten __P((struct socket *so, int backlog, struct proc *p));
378 sonewconn __P((struct socket *head, int connstatus));
380 sonewconn3 __P((struct socket *head, int connstatus, struct proc *p));
381 int sooptcopyin __P((struct sockopt *sopt, void *buf, size_t len,
383 int sooptcopyout __P((struct sockopt *sopt, void *buf, size_t len));
385 /* XXX; prepare mbuf for (__FreeBSD__ < 3) routines. */
386 int soopt_getm __P((struct sockopt *sopt, struct mbuf **mp));
387 int soopt_mcopyin __P((struct sockopt *sopt, struct mbuf *m));
388 int soopt_mcopyout __P((struct sockopt *sopt, struct mbuf *m));
390 int sopoll __P((struct socket *so, int events, struct ucred *cred,
392 int soreceive __P((struct socket *so, struct sockaddr **paddr,
393 struct uio *uio, struct mbuf **mp0,
394 struct mbuf **controlp, int *flagsp));
395 int soreserve __P((struct socket *so, u_long sndcc, u_long rcvcc));
396 void sorflush __P((struct socket *so));
397 int sosend __P((struct socket *so, struct sockaddr *addr, struct uio *uio,
398 struct mbuf *top, struct mbuf *control, int flags,
400 int sosetopt __P((struct socket *so, struct sockopt *sopt));
401 int soshutdown __P((struct socket *so, int how));
402 void sotoxsocket __P((struct socket *so, struct xsocket *xso));
403 void sowakeup __P((struct socket *so, struct sockbuf *sb));
405 /* accept filter functions */
406 int accept_filt_add __P((struct accept_filter *filt));
407 int accept_filt_del __P((char *name));
408 struct accept_filter * accept_filt_get __P((char *name));
409 #ifdef ACCEPT_FILTER_MOD
410 int accept_filt_generic_mod_event __P((module_t mod, int event, void *data));
411 SYSCTL_DECL(_net_inet_accf);
412 #endif /* ACCEPT_FILTER_MOD */
416 #endif /* !_SYS_SOCKETVAR_H_ */