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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 $
35 * $DragonFly: src/sys/sys/socketvar.h,v 1.2 2003/06/17 04:28:58 dillon 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 caddr_t 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 selinfo sb_sel; /* process selecting read/write */
97 short sb_flags; /* flags, see below */
98 short sb_timeo; /* timeout for read/write */
100 #define SB_MAX (256*1024) /* default for max chars in sockbuf */
101 #define SB_LOCK 0x01 /* lock on data queue */
102 #define SB_WANT 0x02 /* someone is waiting to lock */
103 #define SB_WAIT 0x04 /* someone is waiting for data/space */
104 #define SB_SEL 0x08 /* someone is selecting */
105 #define SB_ASYNC 0x10 /* ASYNC I/O, need signals */
106 #define SB_UPCALL 0x20 /* someone wants an upcall */
107 #define SB_NOINTR 0x40 /* operations not interruptible */
108 #define SB_AIO 0x80 /* AIO operations queued */
109 #define SB_KNOTE 0x100 /* kernel note attached */
111 void (*so_upcall) __P((struct socket *, void *, int));
113 struct ucred *so_cred; /* user credentials */
114 /* NB: generation count must not be first; easiest to make it last. */
115 so_gen_t so_gencnt; /* generation count */
116 void *so_emuldata; /* private data for emulators */
118 struct accept_filter *so_accept_filter;
119 void *so_accept_filter_arg; /* saved filter args */
120 char *so_accept_filter_str; /* saved user args */
127 #define SS_NOFDREF 0x0001 /* no file table ref any more */
128 #define SS_ISCONNECTED 0x0002 /* socket connected to a peer */
129 #define SS_ISCONNECTING 0x0004 /* in process of connecting to peer */
130 #define SS_ISDISCONNECTING 0x0008 /* in process of disconnecting */
131 #define SS_CANTSENDMORE 0x0010 /* can't send more data to peer */
132 #define SS_CANTRCVMORE 0x0020 /* can't receive more data from peer */
133 #define SS_RCVATMARK 0x0040 /* at mark on input */
135 #define SS_NBIO 0x0100 /* non-blocking ops */
136 #define SS_ASYNC 0x0200 /* async i/o notify */
137 #define SS_ISCONFIRMING 0x0400 /* deciding to accept connection req */
139 #define SS_INCOMP 0x0800 /* unaccepted, incomplete connection */
140 #define SS_COMP 0x1000 /* unaccepted, complete connection */
141 #define SS_ISDISCONNECTED 0x2000 /* socket disconnected from peer */
144 * Externalized form of struct socket used by the sysctl(3) interface.
147 size_t xso_len; /* length of this structure */
148 struct socket *xso_so; /* makes a convenient handle sometimes */
153 caddr_t so_pcb; /* another convenient handle */
172 uid_t so_uid; /* XXX */
176 * Macros for sockets and socket buffering.
180 * Do we need to notify the other side when I/O is possible?
182 #define sb_notify(sb) (((sb)->sb_flags & (SB_WAIT | SB_SEL | SB_ASYNC | \
183 SB_UPCALL | SB_AIO | SB_KNOTE)) != 0)
186 * How much space is there in a socket buffer (so->so_snd or so->so_rcv)?
187 * This is problematical if the fields are unsigned, as the space might
188 * still be negative (cc > hiwat or mbcnt > mbmax). Should detect
189 * overflow and return 0. Should use "lmin" but it doesn't exist now.
191 #define sbspace(sb) \
192 ((long) imin((int)((sb)->sb_hiwat - (sb)->sb_cc), \
193 (int)((sb)->sb_mbmax - (sb)->sb_mbcnt)))
195 /* do we have to send all at once on a socket? */
196 #define sosendallatonce(so) \
197 ((so)->so_proto->pr_flags & PR_ATOMIC)
199 /* can we read something from so? */
200 #define soreadable(so) \
201 ((so)->so_rcv.sb_cc >= (so)->so_rcv.sb_lowat || \
202 ((so)->so_state & SS_CANTRCVMORE) || \
203 (so)->so_comp.tqh_first || (so)->so_error)
205 /* can we write something to so? */
206 #define sowriteable(so) \
207 ((sbspace(&(so)->so_snd) >= (so)->so_snd.sb_lowat && \
208 (((so)->so_state&SS_ISCONNECTED) || \
209 ((so)->so_proto->pr_flags&PR_CONNREQUIRED)==0)) || \
210 ((so)->so_state & SS_CANTSENDMORE) || \
213 /* adjust counters in sb reflecting allocation of m */
214 #define sballoc(sb, m) { \
215 (sb)->sb_cc += (m)->m_len; \
216 (sb)->sb_mbcnt += MSIZE; \
217 if ((m)->m_flags & M_EXT) \
218 (sb)->sb_mbcnt += (m)->m_ext.ext_size; \
221 /* adjust counters in sb reflecting freeing of m */
222 #define sbfree(sb, m) { \
223 (sb)->sb_cc -= (m)->m_len; \
224 (sb)->sb_mbcnt -= MSIZE; \
225 if ((m)->m_flags & M_EXT) \
226 (sb)->sb_mbcnt -= (m)->m_ext.ext_size; \
230 * Set lock on sockbuf sb; sleep if lock is already held.
231 * Unless SB_NOINTR is set on sockbuf, sleep is interruptible.
232 * Returns error without lock if sleep is interrupted.
234 #define sblock(sb, wf) ((sb)->sb_flags & SB_LOCK ? \
235 (((wf) == M_WAITOK) ? sb_lock(sb) : EWOULDBLOCK) : \
236 ((sb)->sb_flags |= SB_LOCK), 0)
238 /* release lock on sockbuf sb */
239 #define sbunlock(sb) { \
240 (sb)->sb_flags &= ~SB_LOCK; \
241 if ((sb)->sb_flags & SB_WANT) { \
242 (sb)->sb_flags &= ~SB_WANT; \
243 wakeup((caddr_t)&(sb)->sb_flags); \
247 #define sorwakeup(so) do { \
248 if (sb_notify(&(so)->so_rcv)) \
249 sowakeup((so), &(so)->so_rcv); \
252 #define sowwakeup(so) do { \
253 if (sb_notify(&(so)->so_snd)) \
254 sowakeup((so), &(so)->so_snd); \
260 * Argument structure for sosetopt et seq. This is in the KERNEL
261 * section because it will never be visible to user code.
263 enum sopt_dir { SOPT_GET, SOPT_SET };
265 enum sopt_dir sopt_dir; /* is this a get or a set? */
266 int sopt_level; /* second arg of [gs]etsockopt */
267 int sopt_name; /* third arg of [gs]etsockopt */
268 void *sopt_val; /* fourth arg of [gs]etsockopt */
269 size_t sopt_valsize; /* (almost) fifth arg of [gs]etsockopt */
270 struct proc *sopt_p; /* calling process or null if kernel */
274 SLIST_ENTRY(sf_buf) free_list; /* list of free buffer slots */
275 int refcnt; /* reference count */
276 struct vm_page *m; /* currently mapped page */
277 vm_offset_t kva; /* va of mapping */
280 struct accept_filter {
282 void (*accf_callback)
283 __P((struct socket *so, void *arg, int waitflag));
284 void * (*accf_create)
285 __P((struct socket *so, char *arg));
287 __P((struct socket *so));
288 SLIST_ENTRY(accept_filter) accf_next; /* next on the list */
291 #ifdef MALLOC_DECLARE
292 MALLOC_DECLARE(M_PCB);
293 MALLOC_DECLARE(M_SONAME);
294 MALLOC_DECLARE(M_ACCF);
297 extern int maxsockets;
298 extern u_long sb_max;
299 extern struct vm_zone *socket_zone;
300 extern so_gen_t so_gencnt;
312 * File operations on sockets.
314 int soo_read __P((struct file *fp, struct uio *uio, struct ucred *cred,
315 int flags, struct proc *p));
316 int soo_write __P((struct file *fp, struct uio *uio, struct ucred *cred,
317 int flags, struct proc *p));
318 int soo_close __P((struct file *fp, struct proc *p));
319 int soo_ioctl __P((struct file *fp, u_long cmd, caddr_t data,
321 int soo_poll __P((struct file *fp, int events, struct ucred *cred,
323 int soo_stat __P((struct file *fp, struct stat *ub, struct proc *p));
324 int sokqfilter __P((struct file *fp, struct knote *kn));
327 * From uipc_socket and friends
329 struct sockaddr *dup_sockaddr __P((struct sockaddr *sa, int canwait));
330 int holdsock __P((struct filedesc *fdp, int fdes, struct file **fpp));
331 int sockargs __P((struct mbuf **mp, caddr_t buf, int buflen, int type));
332 int getsockaddr __P((struct sockaddr **namp, caddr_t uaddr, size_t len));
333 void sbappend __P((struct sockbuf *sb, struct mbuf *m));
334 int sbappendaddr __P((struct sockbuf *sb, struct sockaddr *asa,
335 struct mbuf *m0, struct mbuf *control));
336 int sbappendcontrol __P((struct sockbuf *sb, struct mbuf *m0,
337 struct mbuf *control));
338 void sbappendrecord __P((struct sockbuf *sb, struct mbuf *m0));
339 void sbcheck __P((struct sockbuf *sb));
340 void sbcompress __P((struct sockbuf *sb, struct mbuf *m, struct mbuf *n));
342 sbcreatecontrol __P((caddr_t p, int size, int type, int level));
343 void sbdrop __P((struct sockbuf *sb, int len));
344 void sbdroprecord __P((struct sockbuf *sb));
345 void sbflush __P((struct sockbuf *sb));
346 void sbinsertoob __P((struct sockbuf *sb, struct mbuf *m0));
347 void sbrelease __P((struct sockbuf *sb, struct socket *so));
348 int sbreserve __P((struct sockbuf *sb, u_long cc, struct socket *so,
350 void sbtoxsockbuf __P((struct sockbuf *sb, struct xsockbuf *xsb));
351 int sbwait __P((struct sockbuf *sb));
352 int sb_lock __P((struct sockbuf *sb));
355 void sf_buf_free(caddr_t addr, u_int size);
356 void sf_buf_ref(caddr_t addr, u_int size);
357 int soabort __P((struct socket *so));
358 int soaccept __P((struct socket *so, struct sockaddr **nam));
359 struct socket *soalloc __P((int waitok));
360 int sobind __P((struct socket *so, struct sockaddr *nam, struct proc *p));
361 void socantrcvmore __P((struct socket *so));
362 void socantsendmore __P((struct socket *so));
363 int soclose __P((struct socket *so));
364 int soconnect __P((struct socket *so, struct sockaddr *nam, struct proc *p));
365 int soconnect2 __P((struct socket *so1, struct socket *so2));
366 int socreate __P((int dom, struct socket **aso, int type, int proto,
368 void sodealloc __P((struct socket *so));
369 int sodisconnect __P((struct socket *so));
370 void sofree __P((struct socket *so));
371 int sogetopt __P((struct socket *so, struct sockopt *sopt));
372 void sohasoutofband __P((struct socket *so));
373 void soisconnected __P((struct socket *so));
374 void soisconnecting __P((struct socket *so));
375 void soisdisconnected __P((struct socket *so));
376 void soisdisconnecting __P((struct socket *so));
377 int solisten __P((struct socket *so, int backlog, struct proc *p));
379 sonewconn __P((struct socket *head, int connstatus));
381 sonewconn3 __P((struct socket *head, int connstatus, struct proc *p));
382 int sooptcopyin __P((struct sockopt *sopt, void *buf, size_t len,
384 int sooptcopyout __P((struct sockopt *sopt, void *buf, size_t len));
386 /* XXX; prepare mbuf for (__FreeBSD__ < 3) routines. */
387 int soopt_getm __P((struct sockopt *sopt, struct mbuf **mp));
388 int soopt_mcopyin __P((struct sockopt *sopt, struct mbuf *m));
389 int soopt_mcopyout __P((struct sockopt *sopt, struct mbuf *m));
391 int sopoll __P((struct socket *so, int events, struct ucred *cred,
393 int soreceive __P((struct socket *so, struct sockaddr **paddr,
394 struct uio *uio, struct mbuf **mp0,
395 struct mbuf **controlp, int *flagsp));
396 int soreserve __P((struct socket *so, u_long sndcc, u_long rcvcc));
397 void sorflush __P((struct socket *so));
398 int sosend __P((struct socket *so, struct sockaddr *addr, struct uio *uio,
399 struct mbuf *top, struct mbuf *control, int flags,
401 int sosetopt __P((struct socket *so, struct sockopt *sopt));
402 int soshutdown __P((struct socket *so, int how));
403 void sotoxsocket __P((struct socket *so, struct xsocket *xso));
404 void sowakeup __P((struct socket *so, struct sockbuf *sb));
406 /* accept filter functions */
407 int accept_filt_add __P((struct accept_filter *filt));
408 int accept_filt_del __P((char *name));
409 struct accept_filter * accept_filt_get __P((char *name));
410 #ifdef ACCEPT_FILTER_MOD
411 int accept_filt_generic_mod_event __P((module_t mod, int event, void *data));
412 SYSCTL_DECL(_net_inet_accf);
413 #endif /* ACCEPT_FILTER_MOD */
417 #endif /* !_SYS_SOCKETVAR_H_ */