FreeBSD/Linux Kernel Cross Reference
sys/sys/socketvar.h
1 /*-
2 * Copyright (c) 1982, 1986, 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)socketvar.h 8.3 (Berkeley) 2/19/95
30 *
31 * $FreeBSD: releng/8.3/sys/sys/socketvar.h 199583 2009-11-20 15:27:52Z jhb $
32 */
33
34 #ifndef _SYS_SOCKETVAR_H_
35 #define _SYS_SOCKETVAR_H_
36
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>
41 #include <sys/_sx.h>
42 #include <sys/sockbuf.h>
43 #include <sys/sockstate.h>
44 #ifdef _KERNEL
45 #include <sys/sockopt.h>
46 #endif
47
48 struct vnet;
49
50 /*
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.
55 */
56 typedef u_quad_t so_gen_t;
57
58 struct socket;
59
60 /*-
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.
70 */
71 struct socket {
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 */
81 /*
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.
91 */
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
98 connections */
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 */
106
107 struct sockbuf so_rcv, so_snd;
108
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 */
115 struct so_accf {
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 */
119 } *so_accf;
120 int so_fibnum; /* routing domain for this socket */
121 };
122
123 /*
124 * Global accept mutex to serialize access to accept queues and
125 * fields associated with multiple sockets. This allows us to
126 * avoid defining a lock order between listen and accept sockets
127 * until such time as it proves to be a good idea.
128 */
129 extern struct mtx accept_mtx;
130 #define ACCEPT_LOCK_ASSERT() mtx_assert(&accept_mtx, MA_OWNED)
131 #define ACCEPT_UNLOCK_ASSERT() mtx_assert(&accept_mtx, MA_NOTOWNED)
132 #define ACCEPT_LOCK() mtx_lock(&accept_mtx)
133 #define ACCEPT_UNLOCK() mtx_unlock(&accept_mtx)
134
135 /*
136 * Per-socket mutex: we reuse the receive socket buffer mutex for space
137 * efficiency. This decision should probably be revisited as we optimize
138 * locking for the socket code.
139 */
140 #define SOCK_MTX(_so) SOCKBUF_MTX(&(_so)->so_rcv)
141 #define SOCK_LOCK(_so) SOCKBUF_LOCK(&(_so)->so_rcv)
142 #define SOCK_OWNED(_so) SOCKBUF_OWNED(&(_so)->so_rcv)
143 #define SOCK_UNLOCK(_so) SOCKBUF_UNLOCK(&(_so)->so_rcv)
144 #define SOCK_LOCK_ASSERT(_so) SOCKBUF_LOCK_ASSERT(&(_so)->so_rcv)
145
146 /*
147 * Socket state bits stored in so_qstate.
148 */
149 #define SQ_INCOMP 0x0800 /* unaccepted, incomplete connection */
150 #define SQ_COMP 0x1000 /* unaccepted, complete connection */
151
152 /*
153 * Externalized form of struct socket used by the sysctl(3) interface.
154 */
155 struct xsocket {
156 size_t xso_len; /* length of this structure */
157 struct socket *xso_so; /* makes a convenient handle sometimes */
158 short so_type;
159 short so_options;
160 short so_linger;
161 short so_state;
162 caddr_t so_pcb; /* another convenient handle */
163 int xso_protocol;
164 int xso_family;
165 u_short so_qlen;
166 u_short so_incqlen;
167 u_short so_qlimit;
168 short so_timeo;
169 u_short so_error;
170 pid_t so_pgid;
171 u_long so_oobmark;
172 struct xsockbuf so_rcv, so_snd;
173 uid_t so_uid; /* XXX */
174 };
175
176 #ifdef _KERNEL
177
178 /*
179 * Macros for sockets and socket buffering.
180 */
181
182 /*
183 * Flags to sblock().
184 */
185 #define SBL_WAIT 0x00000001 /* Wait if not immediately available. */
186 #define SBL_NOINTR 0x00000002 /* Force non-interruptible sleep. */
187 #define SBL_VALID (SBL_WAIT | SBL_NOINTR)
188
189 /*
190 * Do we need to notify the other side when I/O is possible?
191 */
192 #define sb_notify(sb) (((sb)->sb_flags & (SB_WAIT | SB_SEL | SB_ASYNC | \
193 SB_UPCALL | SB_AIO | SB_KNOTE)) != 0)
194
195 /* do we have to send all at once on a socket? */
196 #define sosendallatonce(so) \
197 ((so)->so_proto->pr_flags & PR_ATOMIC)
198
199 /* can we read something from so? */
200 #define soreadabledata(so) \
201 ((so)->so_rcv.sb_cc >= (so)->so_rcv.sb_lowat || \
202 !TAILQ_EMPTY(&(so)->so_comp) || (so)->so_error)
203 #define soreadable(so) \
204 (soreadabledata(so) || ((so)->so_rcv.sb_state & SBS_CANTRCVMORE))
205
206 /* can we write something to so? */
207 #define sowriteable(so) \
208 ((sbspace(&(so)->so_snd) >= (so)->so_snd.sb_lowat && \
209 (((so)->so_state&SS_ISCONNECTED) || \
210 ((so)->so_proto->pr_flags&PR_CONNREQUIRED)==0)) || \
211 ((so)->so_snd.sb_state & SBS_CANTSENDMORE) || \
212 (so)->so_error)
213
214 /*
215 * soref()/sorele() ref-count the socket structure. Note that you must
216 * still explicitly close the socket, but the last ref count will free
217 * the structure.
218 */
219 #define soref(so) do { \
220 SOCK_LOCK_ASSERT(so); \
221 ++(so)->so_count; \
222 } while (0)
223
224 #define sorele(so) do { \
225 ACCEPT_LOCK_ASSERT(); \
226 SOCK_LOCK_ASSERT(so); \
227 if ((so)->so_count <= 0) \
228 panic("sorele"); \
229 if (--(so)->so_count == 0) \
230 sofree(so); \
231 else { \
232 SOCK_UNLOCK(so); \
233 ACCEPT_UNLOCK(); \
234 } \
235 } while (0)
236
237 #define sotryfree(so) do { \
238 ACCEPT_LOCK_ASSERT(); \
239 SOCK_LOCK_ASSERT(so); \
240 if ((so)->so_count == 0) \
241 sofree(so); \
242 else { \
243 SOCK_UNLOCK(so); \
244 ACCEPT_UNLOCK(); \
245 } \
246 } while(0)
247
248 /*
249 * In sorwakeup() and sowwakeup(), acquire the socket buffer lock to
250 * avoid a non-atomic test-and-wakeup. However, sowakeup is
251 * responsible for releasing the lock if it is called. We unlock only
252 * if we don't call into sowakeup. If any code is introduced that
253 * directly invokes the underlying sowakeup() primitives, it must
254 * maintain the same semantics.
255 */
256 #define sorwakeup_locked(so) do { \
257 SOCKBUF_LOCK_ASSERT(&(so)->so_rcv); \
258 if (sb_notify(&(so)->so_rcv)) \
259 sowakeup((so), &(so)->so_rcv); \
260 else \
261 SOCKBUF_UNLOCK(&(so)->so_rcv); \
262 } while (0)
263
264 #define sorwakeup(so) do { \
265 SOCKBUF_LOCK(&(so)->so_rcv); \
266 sorwakeup_locked(so); \
267 } while (0)
268
269 #define sowwakeup_locked(so) do { \
270 SOCKBUF_LOCK_ASSERT(&(so)->so_snd); \
271 if (sb_notify(&(so)->so_snd)) \
272 sowakeup((so), &(so)->so_snd); \
273 else \
274 SOCKBUF_UNLOCK(&(so)->so_snd); \
275 } while (0)
276
277 #define sowwakeup(so) do { \
278 SOCKBUF_LOCK(&(so)->so_snd); \
279 sowwakeup_locked(so); \
280 } while (0)
281
282 struct accept_filter {
283 char accf_name[16];
284 int (*accf_callback)
285 (struct socket *so, void *arg, int waitflag);
286 void * (*accf_create)
287 (struct socket *so, char *arg);
288 void (*accf_destroy)
289 (struct socket *so);
290 SLIST_ENTRY(accept_filter) accf_next;
291 };
292
293 #ifdef MALLOC_DECLARE
294 MALLOC_DECLARE(M_ACCF);
295 MALLOC_DECLARE(M_PCB);
296 MALLOC_DECLARE(M_SONAME);
297 #endif
298
299 extern int maxsockets;
300 extern u_long sb_max;
301 extern struct uma_zone *socket_zone;
302 extern so_gen_t so_gencnt;
303
304 struct mbuf;
305 struct sockaddr;
306 struct ucred;
307 struct uio;
308
309 /* 'which' values for socket upcalls. */
310 #define SO_RCV 1
311 #define SO_SND 2
312
313 /* Return values for socket upcalls. */
314 #define SU_OK 0
315 #define SU_ISCONNECTED 1
316
317 /*
318 * From uipc_socket and friends
319 */
320 int sockargs(struct mbuf **mp, caddr_t buf, int buflen, int type);
321 int getsockaddr(struct sockaddr **namp, caddr_t uaddr, size_t len);
322 void soabort(struct socket *so);
323 int soaccept(struct socket *so, struct sockaddr **nam);
324 int socheckuid(struct socket *so, uid_t uid);
325 int sobind(struct socket *so, struct sockaddr *nam, struct thread *td);
326 int soclose(struct socket *so);
327 int soconnect(struct socket *so, struct sockaddr *nam, struct thread *td);
328 int soconnect2(struct socket *so1, struct socket *so2);
329 int socow_setup(struct mbuf *m0, struct uio *uio);
330 int socreate(int dom, struct socket **aso, int type, int proto,
331 struct ucred *cred, struct thread *td);
332 int sodisconnect(struct socket *so);
333 struct sockaddr *sodupsockaddr(const struct sockaddr *sa, int mflags);
334 void sofree(struct socket *so);
335 void sohasoutofband(struct socket *so);
336 int solisten(struct socket *so, int backlog, struct thread *td);
337 void solisten_proto(struct socket *so, int backlog);
338 int solisten_proto_check(struct socket *so);
339 struct socket *
340 sonewconn(struct socket *head, int connstatus);
341
342
343 int sopoll(struct socket *so, int events, struct ucred *active_cred,
344 struct thread *td);
345 int sopoll_generic(struct socket *so, int events,
346 struct ucred *active_cred, struct thread *td);
347 int soreceive(struct socket *so, struct sockaddr **paddr, struct uio *uio,
348 struct mbuf **mp0, struct mbuf **controlp, int *flagsp);
349 int soreceive_stream(struct socket *so, struct sockaddr **paddr,
350 struct uio *uio, struct mbuf **mp0, struct mbuf **controlp,
351 int *flagsp);
352 int soreceive_dgram(struct socket *so, struct sockaddr **paddr,
353 struct uio *uio, struct mbuf **mp0, struct mbuf **controlp,
354 int *flagsp);
355 int soreceive_generic(struct socket *so, struct sockaddr **paddr,
356 struct uio *uio, struct mbuf **mp0, struct mbuf **controlp,
357 int *flagsp);
358 int soreserve(struct socket *so, u_long sndcc, u_long rcvcc);
359 void sorflush(struct socket *so);
360 int sosend(struct socket *so, struct sockaddr *addr, struct uio *uio,
361 struct mbuf *top, struct mbuf *control, int flags,
362 struct thread *td);
363 int sosend_dgram(struct socket *so, struct sockaddr *addr,
364 struct uio *uio, struct mbuf *top, struct mbuf *control,
365 int flags, struct thread *td);
366 int sosend_generic(struct socket *so, struct sockaddr *addr,
367 struct uio *uio, struct mbuf *top, struct mbuf *control,
368 int flags, struct thread *td);
369 int soshutdown(struct socket *so, int how);
370 void sotoxsocket(struct socket *so, struct xsocket *xso);
371 void soupcall_clear(struct socket *so, int which);
372 void soupcall_set(struct socket *so, int which,
373 int (*func)(struct socket *, void *, int), void *arg);
374 void sowakeup(struct socket *so, struct sockbuf *sb);
375 int selsocket(struct socket *so, int events, struct timeval *tv,
376 struct thread *td);
377
378 /*
379 * Accept filter functions (duh).
380 */
381 int accept_filt_add(struct accept_filter *filt);
382 int accept_filt_del(char *name);
383 struct accept_filter *accept_filt_get(char *name);
384 #ifdef ACCEPT_FILTER_MOD
385 #ifdef SYSCTL_DECL
386 SYSCTL_DECL(_net_inet_accf);
387 #endif
388 int accept_filt_generic_mod_event(module_t mod, int event, void *data);
389 #endif
390
391 #endif /* _KERNEL */
392
393 #endif /* !_SYS_SOCKETVAR_H_ */
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