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29 * @(#)socketvar.h 8.3 (Berkeley) 2/19/95
33 #ifndef _SYS_SOCKETVAR_H_
34 #define _SYS_SOCKETVAR_H_
36 #include <sys/queue.h> /* for TAILQ macros */
37 #include <sys/selinfo.h> /* for struct selinfo */
38 #include <sys/_lock.h>
39 #include <sys/_mutex.h>
43 * Kernel structure per socket.
44 * Contains send and receive buffer queues,
45 * handle on protocol and pointer to protocol
46 * private data and error information.
48 typedef u_quad_t so_gen_t;
51 * Locking key to struct socket:
52 * (a) constant after allocation, no locking required.
53 * (b) locked by SOCK_LOCK(so).
54 * (c) locked by SOCKBUF_LOCK(&so->so_rcv).
55 * (d) locked by SOCKBUF_LOCK(&so->so_snd).
56 * (e) locked by ACCEPT_LOCK().
57 * (f) not locked since integer reads/writes are atomic.
58 * (g) used only as a sleep/wakeup address, no value.
59 * (h) locked by global mutex so_global_mtx.
62 int so_count; /* (b) reference count */
63 short so_type; /* (a) generic type, see socket.h */
64 short so_options; /* from socket call, see socket.h */
65 short so_linger; /* time to linger while closing */
66 short so_state; /* (b) internal state flags SS_* */
67 int so_qstate; /* (e) internal state flags SQ_* */
68 void *so_pcb; /* protocol control block */
69 struct protosw *so_proto; /* (a) protocol handle */
71 * Variables for connection queuing.
72 * Socket where accepts occur is so_head in all subsidiary sockets.
73 * If so_head is 0, socket is not related to an accept.
74 * For head socket so_incomp queues partially completed connections,
75 * while so_comp is a queue of connections ready to be accepted.
76 * If a connection is aborted and it has so_head set, then
77 * it has to be pulled out of either so_incomp or so_comp.
78 * We allow connections to queue up based on current queue lengths
79 * and limit on number of queued connections for this socket.
81 struct socket *so_head; /* (e) back pointer to listen socket */
82 TAILQ_HEAD(, socket) so_incomp; /* (e) queue of partial unaccepted connections */
83 TAILQ_HEAD(, socket) so_comp; /* (e) queue of complete unaccepted connections */
84 TAILQ_ENTRY(socket) so_list; /* (e) list of unaccepted connections */
85 u_short so_qlen; /* (e) number of unaccepted connections */
86 u_short so_incqlen; /* (e) number of unaccepted incomplete
88 u_short so_qlimit; /* (e) max number queued connections */
89 short so_timeo; /* (g) connection timeout */
90 u_short so_error; /* (f) error affecting connection */
91 struct sigio *so_sigio; /* [sg] information for async I/O or
92 out of band data (SIGURG) */
93 u_long so_oobmark; /* (c) chars to oob mark */
94 TAILQ_HEAD(, aiocblist) so_aiojobq; /* AIO ops waiting on socket */
96 * Variables for socket buffering.
99 struct selinfo sb_sel; /* process selecting read/write */
100 struct mtx sb_mtx; /* sockbuf lock */
101 struct sx sb_sx; /* prevent I/O interlacing */
102 short sb_state; /* (c/d) socket state on sockbuf */
103 #define sb_startzero sb_mb
104 struct mbuf *sb_mb; /* (c/d) the mbuf chain */
105 struct mbuf *sb_mbtail; /* (c/d) the last mbuf in the chain */
106 struct mbuf *sb_lastrecord; /* (c/d) first mbuf of last
107 * record in socket buffer */
108 struct mbuf *sb_sndptr; /* (c/d) pointer into mbuf chain */
109 u_int sb_sndptroff; /* (c/d) byte offset of ptr into chain */
110 u_int sb_cc; /* (c/d) actual chars in buffer */
111 u_int sb_hiwat; /* (c/d) max actual char count */
112 u_int sb_mbcnt; /* (c/d) chars of mbufs used */
113 u_int sb_mcnt; /* (c/d) number of mbufs in buffer */
114 u_int sb_ccnt; /* (c/d) number of clusters in buffer */
115 u_int sb_mbmax; /* (c/d) max chars of mbufs to use */
116 u_int sb_ctl; /* (c/d) non-data chars in buffer */
117 int sb_lowat; /* (c/d) low water mark */
118 int sb_timeo; /* (c/d) timeout for read/write */
119 short sb_flags; /* (c/d) flags, see below */
122 * Constants for sb_flags field of struct sockbuf.
124 #define SB_MAX (256*1024) /* default for max chars in sockbuf */
126 * Constants for sb_flags field of struct sockbuf.
128 #define SB_WAIT 0x04 /* someone is waiting for data/space */
129 #define SB_SEL 0x08 /* someone is selecting */
130 #define SB_ASYNC 0x10 /* ASYNC I/O, need signals */
131 #define SB_UPCALL 0x20 /* someone wants an upcall */
132 #define SB_NOINTR 0x40 /* operations not interruptible */
133 #define SB_AIO 0x80 /* AIO operations queued */
134 #define SB_KNOTE 0x100 /* kernel note attached */
135 #define SB_NOCOALESCE 0x200 /* don't coalesce new data into existing mbufs */
136 #define SB_AUTOSIZE 0x800 /* automatically size socket buffer */
138 void (*so_upcall)(struct socket *, void *, int);
140 struct ucred *so_cred; /* (a) user credentials */
141 struct label *so_label; /* (b) MAC label for socket */
142 struct label *so_peerlabel; /* (b) cached MAC label for peer */
143 /* NB: generation count must not be first. */
144 so_gen_t so_gencnt; /* (h) generation count */
145 void *so_emuldata; /* (b) private data for emulators */
147 struct accept_filter *so_accept_filter;
148 void *so_accept_filter_arg; /* saved filter args */
149 char *so_accept_filter_str; /* saved user args */
151 int so_fibnum; /* routing domain for this socket */
154 #define SB_EMPTY_FIXUP(sb) do { \
155 if ((sb)->sb_mb == NULL) { \
156 (sb)->sb_mbtail = NULL; \
157 (sb)->sb_lastrecord = NULL; \
159 } while (/*CONSTCOND*/0)
162 * Global accept mutex to serialize access to accept queues and
163 * fields associated with multiple sockets. This allows us to
164 * avoid defining a lock order between listen and accept sockets
165 * until such time as it proves to be a good idea.
167 extern struct mtx accept_mtx;
168 #define ACCEPT_LOCK_ASSERT() mtx_assert(&accept_mtx, MA_OWNED)
169 #define ACCEPT_UNLOCK_ASSERT() mtx_assert(&accept_mtx, MA_NOTOWNED)
170 #define ACCEPT_LOCK() mtx_lock(&accept_mtx)
171 #define ACCEPT_UNLOCK() mtx_unlock(&accept_mtx)
174 * Per-socket buffer mutex used to protect most fields in the socket
177 #define SOCKBUF_MTX(_sb) (&(_sb)->sb_mtx)
178 #define SOCKBUF_LOCK_INIT(_sb, _name) \
179 mtx_init(SOCKBUF_MTX(_sb), _name, NULL, MTX_DEF)
180 #define SOCKBUF_LOCK_DESTROY(_sb) mtx_destroy(SOCKBUF_MTX(_sb))
181 #define SOCKBUF_LOCK(_sb) mtx_lock(SOCKBUF_MTX(_sb))
182 #define SOCKBUF_OWNED(_sb) mtx_owned(SOCKBUF_MTX(_sb))
183 #define SOCKBUF_UNLOCK(_sb) mtx_unlock(SOCKBUF_MTX(_sb))
184 #define SOCKBUF_LOCK_ASSERT(_sb) mtx_assert(SOCKBUF_MTX(_sb), MA_OWNED)
185 #define SOCKBUF_UNLOCK_ASSERT(_sb) mtx_assert(SOCKBUF_MTX(_sb), MA_NOTOWNED)
188 * Per-socket mutex: we reuse the receive socket buffer mutex for space
189 * efficiency. This decision should probably be revisited as we optimize
190 * locking for the socket code.
192 #define SOCK_MTX(_so) SOCKBUF_MTX(&(_so)->so_rcv)
193 #define SOCK_LOCK(_so) SOCKBUF_LOCK(&(_so)->so_rcv)
194 #define SOCK_OWNED(_so) SOCKBUF_OWNED(&(_so)->so_rcv)
195 #define SOCK_UNLOCK(_so) SOCKBUF_UNLOCK(&(_so)->so_rcv)
196 #define SOCK_LOCK_ASSERT(_so) SOCKBUF_LOCK_ASSERT(&(_so)->so_rcv)
201 * Historically, this bits were all kept in the so_state field. For
202 * locking reasons, they are now in multiple fields, as they are
203 * locked differently. so_state maintains basic socket state protected
204 * by the socket lock. so_qstate holds information about the socket
205 * accept queues. Each socket buffer also has a state field holding
206 * information relevant to that socket buffer (can't send, rcv). Many
207 * fields will be read without locks to improve performance and avoid
208 * lock order issues. However, this approach must be used with caution.
210 #define SS_NOFDREF 0x0001 /* no file table ref any more */
211 #define SS_ISCONNECTED 0x0002 /* socket connected to a peer */
212 #define SS_ISCONNECTING 0x0004 /* in process of connecting to peer */
213 #define SS_ISDISCONNECTING 0x0008 /* in process of disconnecting */
214 #define SS_NBIO 0x0100 /* non-blocking ops */
215 #define SS_ASYNC 0x0200 /* async i/o notify */
216 #define SS_ISCONFIRMING 0x0400 /* deciding to accept connection req */
217 #define SS_ISDISCONNECTED 0x2000 /* socket disconnected from peer */
219 * Protocols can mark a socket as SS_PROTOREF to indicate that, following
220 * pru_detach, they still want the socket to persist, and will free it
221 * themselves when they are done. Protocols should only ever call sofree()
222 * following setting this flag in pru_detach(), and never otherwise, as
223 * sofree() bypasses socket reference counting.
225 #define SS_PROTOREF 0x4000 /* strong protocol reference */
228 * Socket state bits now stored in the socket buffer state field.
230 #define SBS_CANTSENDMORE 0x0010 /* can't send more data to peer */
231 #define SBS_CANTRCVMORE 0x0020 /* can't receive more data from peer */
232 #define SBS_RCVATMARK 0x0040 /* at mark on input */
235 * Socket state bits stored in so_qstate.
237 #define SQ_INCOMP 0x0800 /* unaccepted, incomplete connection */
238 #define SQ_COMP 0x1000 /* unaccepted, complete connection */
241 * Externalized form of struct socket used by the sysctl(3) interface.
244 size_t xso_len; /* length of this structure */
245 struct socket *xso_so; /* makes a convenient handle sometimes */
250 caddr_t so_pcb; /* another convenient handle */
271 uid_t so_uid; /* XXX */
277 * Macros for sockets and socket buffering.
283 #define SBL_WAIT 0x00000001 /* Wait if not immediately available. */
284 #define SBL_NOINTR 0x00000002 /* Force non-interruptible sleep. */
285 #define SBL_VALID (SBL_WAIT | SBL_NOINTR)
288 * Do we need to notify the other side when I/O is possible?
290 #define sb_notify(sb) (((sb)->sb_flags & (SB_WAIT | SB_SEL | SB_ASYNC | \
291 SB_UPCALL | SB_AIO | SB_KNOTE)) != 0)
294 * How much space is there in a socket buffer (so->so_snd or so->so_rcv)?
295 * This is problematical if the fields are unsigned, as the space might
296 * still be negative (cc > hiwat or mbcnt > mbmax). Should detect
297 * overflow and return 0. Should use "lmin" but it doesn't exist now.
299 #define sbspace(sb) \
300 ((long) imin((int)((sb)->sb_hiwat - (sb)->sb_cc), \
301 (int)((sb)->sb_mbmax - (sb)->sb_mbcnt)))
303 /* do we have to send all at once on a socket? */
304 #define sosendallatonce(so) \
305 ((so)->so_proto->pr_flags & PR_ATOMIC)
307 /* can we read something from so? */
308 #define soreadable(so) \
309 ((so)->so_rcv.sb_cc >= (so)->so_rcv.sb_lowat || \
310 ((so)->so_rcv.sb_state & SBS_CANTRCVMORE) || \
311 !TAILQ_EMPTY(&(so)->so_comp) || (so)->so_error)
313 /* can we write something to so? */
314 #define sowriteable(so) \
315 ((sbspace(&(so)->so_snd) >= (so)->so_snd.sb_lowat && \
316 (((so)->so_state&SS_ISCONNECTED) || \
317 ((so)->so_proto->pr_flags&PR_CONNREQUIRED)==0)) || \
318 ((so)->so_snd.sb_state & SBS_CANTSENDMORE) || \
321 /* adjust counters in sb reflecting allocation of m */
322 #define sballoc(sb, m) { \
323 (sb)->sb_cc += (m)->m_len; \
324 if ((m)->m_type != MT_DATA && (m)->m_type != MT_OOBDATA) \
325 (sb)->sb_ctl += (m)->m_len; \
326 (sb)->sb_mbcnt += MSIZE; \
327 (sb)->sb_mcnt += 1; \
328 if ((m)->m_flags & M_EXT) { \
329 (sb)->sb_mbcnt += (m)->m_ext.ext_size; \
330 (sb)->sb_ccnt += 1; \
334 /* adjust counters in sb reflecting freeing of m */
335 #define sbfree(sb, m) { \
336 (sb)->sb_cc -= (m)->m_len; \
337 if ((m)->m_type != MT_DATA && (m)->m_type != MT_OOBDATA) \
338 (sb)->sb_ctl -= (m)->m_len; \
339 (sb)->sb_mbcnt -= MSIZE; \
340 (sb)->sb_mcnt -= 1; \
341 if ((m)->m_flags & M_EXT) { \
342 (sb)->sb_mbcnt -= (m)->m_ext.ext_size; \
343 (sb)->sb_ccnt -= 1; \
345 if ((sb)->sb_sndptr == (m)) { \
346 (sb)->sb_sndptr = NULL; \
347 (sb)->sb_sndptroff = 0; \
349 if ((sb)->sb_sndptroff != 0) \
350 (sb)->sb_sndptroff -= (m)->m_len; \
354 * soref()/sorele() ref-count the socket structure. Note that you must
355 * still explicitly close the socket, but the last ref count will free
358 #define soref(so) do { \
359 SOCK_LOCK_ASSERT(so); \
363 #define sorele(so) do { \
364 ACCEPT_LOCK_ASSERT(); \
365 SOCK_LOCK_ASSERT(so); \
366 if ((so)->so_count <= 0) \
368 if (--(so)->so_count == 0) \
376 #define sotryfree(so) do { \
377 ACCEPT_LOCK_ASSERT(); \
378 SOCK_LOCK_ASSERT(so); \
379 if ((so)->so_count == 0) \
388 * In sorwakeup() and sowwakeup(), acquire the socket buffer lock to
389 * avoid a non-atomic test-and-wakeup. However, sowakeup is
390 * responsible for releasing the lock if it is called. We unlock only
391 * if we don't call into sowakeup. If any code is introduced that
392 * directly invokes the underlying sowakeup() primitives, it must
393 * maintain the same semantics.
395 #define sorwakeup_locked(so) do { \
396 SOCKBUF_LOCK_ASSERT(&(so)->so_rcv); \
397 if (sb_notify(&(so)->so_rcv)) \
398 sowakeup((so), &(so)->so_rcv); \
400 SOCKBUF_UNLOCK(&(so)->so_rcv); \
403 #define sorwakeup(so) do { \
404 SOCKBUF_LOCK(&(so)->so_rcv); \
405 sorwakeup_locked(so); \
408 #define sowwakeup_locked(so) do { \
409 SOCKBUF_LOCK_ASSERT(&(so)->so_snd); \
410 if (sb_notify(&(so)->so_snd)) \
411 sowakeup((so), &(so)->so_snd); \
413 SOCKBUF_UNLOCK(&(so)->so_snd); \
416 #define sowwakeup(so) do { \
417 SOCKBUF_LOCK(&(so)->so_snd); \
418 sowwakeup_locked(so); \
422 * Argument structure for sosetopt et seq. This is in the KERNEL
423 * section because it will never be visible to user code.
425 enum sopt_dir { SOPT_GET, SOPT_SET };
427 enum sopt_dir sopt_dir; /* is this a get or a set? */
428 int sopt_level; /* second arg of [gs]etsockopt */
429 int sopt_name; /* third arg of [gs]etsockopt */
430 void *sopt_val; /* fourth arg of [gs]etsockopt */
431 size_t sopt_valsize; /* (almost) fifth arg of [gs]etsockopt */
432 struct thread *sopt_td; /* calling thread or null if kernel */
435 struct accept_filter {
437 void (*accf_callback)
438 (struct socket *so, void *arg, int waitflag);
439 void * (*accf_create)
440 (struct socket *so, char *arg);
443 SLIST_ENTRY(accept_filter) accf_next;
446 #ifdef MALLOC_DECLARE
447 MALLOC_DECLARE(M_ACCF);
448 MALLOC_DECLARE(M_PCB);
449 MALLOC_DECLARE(M_SONAME);
452 extern int maxsockets;
453 extern u_long sb_max;
454 extern struct uma_zone *socket_zone;
455 extern so_gen_t so_gencnt;
463 * From uipc_socket and friends
465 int do_getopt_accept_filter(struct socket *so, struct sockopt *sopt);
466 int do_setopt_accept_filter(struct socket *so, struct sockopt *sopt);
467 int so_setsockopt(struct socket *so, int level, int optname,
468 void *optval, size_t optlen);
469 int sockargs(struct mbuf **mp, caddr_t buf, int buflen, int type);
470 int getsockaddr(struct sockaddr **namp, caddr_t uaddr, size_t len);
471 void sbappend(struct sockbuf *sb, struct mbuf *m);
472 void sbappend_locked(struct sockbuf *sb, struct mbuf *m);
473 void sbappendstream(struct sockbuf *sb, struct mbuf *m);
474 void sbappendstream_locked(struct sockbuf *sb, struct mbuf *m);
475 int sbappendaddr(struct sockbuf *sb, const struct sockaddr *asa,
476 struct mbuf *m0, struct mbuf *control);
477 int sbappendaddr_locked(struct sockbuf *sb, const struct sockaddr *asa,
478 struct mbuf *m0, struct mbuf *control);
479 int sbappendcontrol(struct sockbuf *sb, struct mbuf *m0,
480 struct mbuf *control);
481 int sbappendcontrol_locked(struct sockbuf *sb, struct mbuf *m0,
482 struct mbuf *control);
483 void sbappendrecord(struct sockbuf *sb, struct mbuf *m0);
484 void sbappendrecord_locked(struct sockbuf *sb, struct mbuf *m0);
485 void sbcheck(struct sockbuf *sb);
486 void sbcompress(struct sockbuf *sb, struct mbuf *m, struct mbuf *n);
488 sbcreatecontrol(caddr_t p, int size, int type, int level);
489 void sbdestroy(struct sockbuf *sb, struct socket *so);
490 void sbdrop(struct sockbuf *sb, int len);
491 void sbdrop_locked(struct sockbuf *sb, int len);
492 void sbdroprecord(struct sockbuf *sb);
493 void sbdroprecord_locked(struct sockbuf *sb);
494 void sbflush(struct sockbuf *sb);
495 void sbflush_locked(struct sockbuf *sb);
496 void sbrelease(struct sockbuf *sb, struct socket *so);
497 void sbrelease_internal(struct sockbuf *sb, struct socket *so);
498 void sbrelease_locked(struct sockbuf *sb, struct socket *so);
499 int sbreserve(struct sockbuf *sb, u_long cc, struct socket *so,
501 int sbreserve_locked(struct sockbuf *sb, u_long cc, struct socket *so,
504 sbsndptr(struct sockbuf *sb, u_int off, u_int len, u_int *moff);
505 void sbtoxsockbuf(struct sockbuf *sb, struct xsockbuf *xsb);
506 int sbwait(struct sockbuf *sb);
507 int sblock(struct sockbuf *sb, int flags);
508 void sbunlock(struct sockbuf *sb);
509 void soabort(struct socket *so);
510 int soaccept(struct socket *so, struct sockaddr **nam);
511 int socheckuid(struct socket *so, uid_t uid);
512 int sobind(struct socket *so, struct sockaddr *nam, struct thread *td);
513 void socantrcvmore(struct socket *so);
514 void socantrcvmore_locked(struct socket *so);
515 void socantsendmore(struct socket *so);
516 void socantsendmore_locked(struct socket *so);
517 int soclose(struct socket *so);
518 int soconnect(struct socket *so, struct sockaddr *nam, struct thread *td);
519 int soconnect2(struct socket *so1, struct socket *so2);
520 int socow_setup(struct mbuf *m0, struct uio *uio);
521 int socreate(int dom, struct socket **aso, int type, int proto,
522 struct ucred *cred, struct thread *td);
523 int sodisconnect(struct socket *so);
524 struct sockaddr *sodupsockaddr(const struct sockaddr *sa, int mflags);
525 void sofree(struct socket *so);
526 int sogetopt(struct socket *so, struct sockopt *sopt);
527 void sohasoutofband(struct socket *so);
528 void soisconnected(struct socket *so);
529 void soisconnecting(struct socket *so);
530 void soisdisconnected(struct socket *so);
531 void soisdisconnecting(struct socket *so);
532 int solisten(struct socket *so, int backlog, struct thread *td);
533 void solisten_proto(struct socket *so, int backlog);
534 int solisten_proto_check(struct socket *so);
536 sonewconn(struct socket *head, int connstatus);
537 int sooptcopyin(struct sockopt *sopt, void *buf, size_t len, size_t minlen);
538 int sooptcopyout(struct sockopt *sopt, const void *buf, size_t len);
540 /* XXX; prepare mbuf for (__FreeBSD__ < 3) routines. */
541 int soopt_getm(struct sockopt *sopt, struct mbuf **mp);
542 int soopt_mcopyin(struct sockopt *sopt, struct mbuf *m);
543 int soopt_mcopyout(struct sockopt *sopt, struct mbuf *m);
545 int sopoll(struct socket *so, int events, struct ucred *active_cred,
547 int sopoll_generic(struct socket *so, int events,
548 struct ucred *active_cred, struct thread *td);
549 int soreceive(struct socket *so, struct sockaddr **paddr, struct uio *uio,
550 struct mbuf **mp0, struct mbuf **controlp, int *flagsp);
551 int soreceive_generic(struct socket *so, struct sockaddr **paddr,
552 struct uio *uio, struct mbuf **mp0, struct mbuf **controlp,
554 int soreserve(struct socket *so, u_long sndcc, u_long rcvcc);
555 void sorflush(struct socket *so);
556 int sosend(struct socket *so, struct sockaddr *addr, struct uio *uio,
557 struct mbuf *top, struct mbuf *control, int flags,
559 int sosend_dgram(struct socket *so, struct sockaddr *addr,
560 struct uio *uio, struct mbuf *top, struct mbuf *control,
561 int flags, struct thread *td);
562 int sosend_generic(struct socket *so, struct sockaddr *addr,
563 struct uio *uio, struct mbuf *top, struct mbuf *control,
564 int flags, struct thread *td);
565 int sosetopt(struct socket *so, struct sockopt *sopt);
566 int soshutdown(struct socket *so, int how);
567 void sotoxsocket(struct socket *so, struct xsocket *xso);
568 void sowakeup(struct socket *so, struct sockbuf *sb);
569 int selsocket(struct socket *so, int events, struct timeval *tv,
573 void sblastrecordchk(struct sockbuf *, const char *, int);
574 #define SBLASTRECORDCHK(sb) sblastrecordchk((sb), __FILE__, __LINE__)
576 void sblastmbufchk(struct sockbuf *, const char *, int);
577 #define SBLASTMBUFCHK(sb) sblastmbufchk((sb), __FILE__, __LINE__)
579 #define SBLASTRECORDCHK(sb) /* nothing */
580 #define SBLASTMBUFCHK(sb) /* nothing */
581 #endif /* SOCKBUF_DEBUG */
584 * Accept filter functions (duh).
586 int accept_filt_add(struct accept_filter *filt);
587 int accept_filt_del(char *name);
588 struct accept_filter *accept_filt_get(char *name);
589 #ifdef ACCEPT_FILTER_MOD
591 SYSCTL_DECL(_net_inet_accf);
593 int accept_filt_generic_mod_event(module_t mod, int event, void *data);
598 #endif /* !_SYS_SOCKETVAR_H_ */