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29 * @(#)socketvar.h 8.3 (Berkeley) 2/19/95
34 #ifndef _SYS_SOCKETVAR_H_
35 #define _SYS_SOCKETVAR_H_
37 #include <sys/queue.h> /* for TAILQ macros */
38 #include <sys/selinfo.h> /* for struct selinfo */
39 #include <sys/_lock.h>
40 #include <sys/_mutex.h>
42 #include <sys/sockbuf.h>
43 #include <sys/sockstate.h>
45 #include <sys/sockopt.h>
51 * Kernel structure per socket.
52 * Contains send and receive buffer queues,
53 * handle on protocol and pointer to protocol
54 * private data and error information.
56 typedef u_quad_t so_gen_t;
61 * Locking key to struct socket:
62 * (a) constant after allocation, no locking required.
63 * (b) locked by SOCK_LOCK(so).
64 * (c) locked by SOCKBUF_LOCK(&so->so_rcv).
65 * (d) locked by SOCKBUF_LOCK(&so->so_snd).
66 * (e) locked by ACCEPT_LOCK().
67 * (f) not locked since integer reads/writes are atomic.
68 * (g) used only as a sleep/wakeup address, no value.
69 * (h) locked by global mutex so_global_mtx.
72 int so_count; /* (b) reference count */
73 short so_type; /* (a) generic type, see socket.h */
74 short so_options; /* from socket call, see socket.h */
75 short so_linger; /* time to linger while closing */
76 short so_state; /* (b) internal state flags SS_* */
77 int so_qstate; /* (e) internal state flags SQ_* */
78 void *so_pcb; /* protocol control block */
79 struct vnet *so_vnet; /* network stack instance */
80 struct protosw *so_proto; /* (a) protocol handle */
82 * Variables for connection queuing.
83 * Socket where accepts occur is so_head in all subsidiary sockets.
84 * If so_head is 0, socket is not related to an accept.
85 * For head socket so_incomp queues partially completed connections,
86 * while so_comp is a queue of connections ready to be accepted.
87 * If a connection is aborted and it has so_head set, then
88 * it has to be pulled out of either so_incomp or so_comp.
89 * We allow connections to queue up based on current queue lengths
90 * and limit on number of queued connections for this socket.
92 struct socket *so_head; /* (e) back pointer to listen socket */
93 TAILQ_HEAD(, socket) so_incomp; /* (e) queue of partial unaccepted connections */
94 TAILQ_HEAD(, socket) so_comp; /* (e) queue of complete unaccepted connections */
95 TAILQ_ENTRY(socket) so_list; /* (e) list of unaccepted connections */
96 u_short so_qlen; /* (e) number of unaccepted connections */
97 u_short so_incqlen; /* (e) number of unaccepted incomplete
99 u_short so_qlimit; /* (e) max number queued connections */
100 short so_timeo; /* (g) connection timeout */
101 u_short so_error; /* (f) error affecting connection */
102 struct sigio *so_sigio; /* [sg] information for async I/O or
103 out of band data (SIGURG) */
104 u_long so_oobmark; /* (c) chars to oob mark */
105 TAILQ_HEAD(, aiocblist) so_aiojobq; /* AIO ops waiting on socket */
107 struct sockbuf so_rcv, so_snd;
109 struct ucred *so_cred; /* (a) user credentials */
110 struct label *so_label; /* (b) MAC label for socket */
111 struct label *so_peerlabel; /* (b) cached MAC label for peer */
112 /* NB: generation count must not be first. */
113 so_gen_t so_gencnt; /* (h) generation count */
114 void *so_emuldata; /* (b) private data for emulators */
116 struct accept_filter *so_accept_filter;
117 void *so_accept_filter_arg; /* saved filter args */
118 char *so_accept_filter_str; /* saved user args */
121 * so_fibnum, so_user_cookie and friends can be used to attach
122 * some user-specified metadata to a socket, which then can be
123 * used by the kernel for various actions.
124 * so_user_cookie is used by ipfw/dummynet.
126 int so_fibnum; /* routing domain for this socket */
127 uint32_t so_user_cookie;
131 * Global accept mutex to serialize access to accept queues and
132 * fields associated with multiple sockets. This allows us to
133 * avoid defining a lock order between listen and accept sockets
134 * until such time as it proves to be a good idea.
136 extern struct mtx accept_mtx;
137 #define ACCEPT_LOCK_ASSERT() mtx_assert(&accept_mtx, MA_OWNED)
138 #define ACCEPT_UNLOCK_ASSERT() mtx_assert(&accept_mtx, MA_NOTOWNED)
139 #define ACCEPT_LOCK() mtx_lock(&accept_mtx)
140 #define ACCEPT_UNLOCK() mtx_unlock(&accept_mtx)
143 * Per-socket mutex: we reuse the receive socket buffer mutex for space
144 * efficiency. This decision should probably be revisited as we optimize
145 * locking for the socket code.
147 #define SOCK_MTX(_so) SOCKBUF_MTX(&(_so)->so_rcv)
148 #define SOCK_LOCK(_so) SOCKBUF_LOCK(&(_so)->so_rcv)
149 #define SOCK_OWNED(_so) SOCKBUF_OWNED(&(_so)->so_rcv)
150 #define SOCK_UNLOCK(_so) SOCKBUF_UNLOCK(&(_so)->so_rcv)
151 #define SOCK_LOCK_ASSERT(_so) SOCKBUF_LOCK_ASSERT(&(_so)->so_rcv)
154 * Socket state bits stored in so_qstate.
156 #define SQ_INCOMP 0x0800 /* unaccepted, incomplete connection */
157 #define SQ_COMP 0x1000 /* unaccepted, complete connection */
160 * Externalized form of struct socket used by the sysctl(3) interface.
163 size_t xso_len; /* length of this structure */
164 struct socket *xso_so; /* makes a convenient handle sometimes */
169 caddr_t so_pcb; /* another convenient handle */
179 struct xsockbuf so_rcv, so_snd;
180 uid_t so_uid; /* XXX */
186 * Macros for sockets and socket buffering.
192 #define SBL_WAIT 0x00000001 /* Wait if not immediately available. */
193 #define SBL_NOINTR 0x00000002 /* Force non-interruptible sleep. */
194 #define SBL_VALID (SBL_WAIT | SBL_NOINTR)
197 * Do we need to notify the other side when I/O is possible?
199 #define sb_notify(sb) (((sb)->sb_flags & (SB_WAIT | SB_SEL | SB_ASYNC | \
200 SB_UPCALL | SB_AIO | SB_KNOTE)) != 0)
202 /* do we have to send all at once on a socket? */
203 #define sosendallatonce(so) \
204 ((so)->so_proto->pr_flags & PR_ATOMIC)
206 /* can we read something from so? */
207 #define soreadabledata(so) \
208 ((so)->so_rcv.sb_cc >= (so)->so_rcv.sb_lowat || \
209 !TAILQ_EMPTY(&(so)->so_comp) || (so)->so_error)
210 #define soreadable(so) \
211 (soreadabledata(so) || ((so)->so_rcv.sb_state & SBS_CANTRCVMORE))
213 /* can we write something to so? */
214 #define sowriteable(so) \
215 ((sbspace(&(so)->so_snd) >= (so)->so_snd.sb_lowat && \
216 (((so)->so_state&SS_ISCONNECTED) || \
217 ((so)->so_proto->pr_flags&PR_CONNREQUIRED)==0)) || \
218 ((so)->so_snd.sb_state & SBS_CANTSENDMORE) || \
222 * soref()/sorele() ref-count the socket structure. Note that you must
223 * still explicitly close the socket, but the last ref count will free
226 #define soref(so) do { \
227 SOCK_LOCK_ASSERT(so); \
231 #define sorele(so) do { \
232 ACCEPT_LOCK_ASSERT(); \
233 SOCK_LOCK_ASSERT(so); \
234 if ((so)->so_count <= 0) \
236 if (--(so)->so_count == 0) \
245 * In sorwakeup() and sowwakeup(), acquire the socket buffer lock to
246 * avoid a non-atomic test-and-wakeup. However, sowakeup is
247 * responsible for releasing the lock if it is called. We unlock only
248 * if we don't call into sowakeup. If any code is introduced that
249 * directly invokes the underlying sowakeup() primitives, it must
250 * maintain the same semantics.
252 #define sorwakeup_locked(so) do { \
253 SOCKBUF_LOCK_ASSERT(&(so)->so_rcv); \
254 if (sb_notify(&(so)->so_rcv)) \
255 sowakeup((so), &(so)->so_rcv); \
257 SOCKBUF_UNLOCK(&(so)->so_rcv); \
260 #define sorwakeup(so) do { \
261 SOCKBUF_LOCK(&(so)->so_rcv); \
262 sorwakeup_locked(so); \
265 #define sowwakeup_locked(so) do { \
266 SOCKBUF_LOCK_ASSERT(&(so)->so_snd); \
267 if (sb_notify(&(so)->so_snd)) \
268 sowakeup((so), &(so)->so_snd); \
270 SOCKBUF_UNLOCK(&(so)->so_snd); \
273 #define sowwakeup(so) do { \
274 SOCKBUF_LOCK(&(so)->so_snd); \
275 sowwakeup_locked(so); \
278 struct accept_filter {
281 (struct socket *so, void *arg, int waitflag);
282 void * (*accf_create)
283 (struct socket *so, char *arg);
286 SLIST_ENTRY(accept_filter) accf_next;
289 #ifdef MALLOC_DECLARE
290 MALLOC_DECLARE(M_ACCF);
291 MALLOC_DECLARE(M_PCB);
292 MALLOC_DECLARE(M_SONAME);
295 extern int maxsockets;
296 extern u_long sb_max;
297 extern struct uma_zone *socket_zone;
298 extern so_gen_t so_gencnt;
305 /* 'which' values for socket upcalls. */
309 /* Return values for socket upcalls. */
311 #define SU_ISCONNECTED 1
314 * From uipc_socket and friends
316 int sockargs(struct mbuf **mp, caddr_t buf, int buflen, int type);
317 int getsockaddr(struct sockaddr **namp, caddr_t uaddr, size_t len);
318 void soabort(struct socket *so);
319 int soaccept(struct socket *so, struct sockaddr **nam);
320 int socheckuid(struct socket *so, uid_t uid);
321 int sobind(struct socket *so, struct sockaddr *nam, struct thread *td);
322 int soclose(struct socket *so);
323 int soconnect(struct socket *so, struct sockaddr *nam, struct thread *td);
324 int soconnect2(struct socket *so1, struct socket *so2);
325 int socow_setup(struct mbuf *m0, struct uio *uio);
326 int socreate(int dom, struct socket **aso, int type, int proto,
327 struct ucred *cred, struct thread *td);
328 int sodisconnect(struct socket *so);
329 struct sockaddr *sodupsockaddr(const struct sockaddr *sa, int mflags);
330 void sofree(struct socket *so);
331 void sohasoutofband(struct socket *so);
332 int solisten(struct socket *so, int backlog, struct thread *td);
333 void solisten_proto(struct socket *so, int backlog);
334 int solisten_proto_check(struct socket *so);
336 sonewconn(struct socket *head, int connstatus);
339 int sopoll(struct socket *so, int events, struct ucred *active_cred,
341 int sopoll_generic(struct socket *so, int events,
342 struct ucred *active_cred, struct thread *td);
343 int soreceive(struct socket *so, struct sockaddr **paddr, struct uio *uio,
344 struct mbuf **mp0, struct mbuf **controlp, int *flagsp);
345 int soreceive_stream(struct socket *so, struct sockaddr **paddr,
346 struct uio *uio, struct mbuf **mp0, struct mbuf **controlp,
348 int soreceive_dgram(struct socket *so, struct sockaddr **paddr,
349 struct uio *uio, struct mbuf **mp0, struct mbuf **controlp,
351 int soreceive_generic(struct socket *so, struct sockaddr **paddr,
352 struct uio *uio, struct mbuf **mp0, struct mbuf **controlp,
354 int soreserve(struct socket *so, u_long sndcc, u_long rcvcc);
355 void sorflush(struct socket *so);
356 int sosend(struct socket *so, struct sockaddr *addr, struct uio *uio,
357 struct mbuf *top, struct mbuf *control, int flags,
359 int sosend_dgram(struct socket *so, struct sockaddr *addr,
360 struct uio *uio, struct mbuf *top, struct mbuf *control,
361 int flags, struct thread *td);
362 int sosend_generic(struct socket *so, struct sockaddr *addr,
363 struct uio *uio, struct mbuf *top, struct mbuf *control,
364 int flags, struct thread *td);
365 int soshutdown(struct socket *so, int how);
366 void sotoxsocket(struct socket *so, struct xsocket *xso);
367 void soupcall_clear(struct socket *so, int which);
368 void soupcall_set(struct socket *so, int which,
369 int (*func)(struct socket *, void *, int), void *arg);
370 void sowakeup(struct socket *so, struct sockbuf *sb);
371 int selsocket(struct socket *so, int events, struct timeval *tv,
375 * Accept filter functions (duh).
377 int accept_filt_add(struct accept_filter *filt);
378 int accept_filt_del(char *name);
379 struct accept_filter *accept_filt_get(char *name);
380 #ifdef ACCEPT_FILTER_MOD
382 SYSCTL_DECL(_net_inet_accf);
384 int accept_filt_generic_mod_event(module_t mod, int event, void *data);
389 #endif /* !_SYS_SOCKETVAR_H_ */