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 * $FreeBSD$
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/osd.h>
42 #include <sys/_sx.h>
43 #include <sys/sockbuf.h>
44 #include <sys/sockstate.h>
45 #ifdef _KERNEL
46 #include <sys/caprights.h>
47 #include <sys/sockopt.h>
48 #endif
49
50 struct vnet;
51
52 /*
53 * Kernel structure per socket.
54 * Contains send and receive buffer queues,
55 * handle on protocol and pointer to protocol
56 * private data and error information.
57 */
58 typedef u_quad_t so_gen_t;
59
60 struct socket;
61
62 /*-
63 * Locking key to struct socket:
64 * (a) constant after allocation, no locking required.
65 * (b) locked by SOCK_LOCK(so).
66 * (c) locked by SOCKBUF_LOCK(&so->so_rcv).
67 * (e) locked by ACCEPT_LOCK().
68 * (f) not locked since integer reads/writes are atomic.
69 * (g) used only as a sleep/wakeup address, no value.
70 * (h) locked by global mutex so_global_mtx.
71 */
72 struct socket {
73 int so_count; /* (b) reference count */
74 short so_type; /* (a) generic type, see socket.h */
75 short so_options; /* from socket call, see socket.h */
76 short so_linger; /* time to linger while closing */
77 short so_state; /* (b) internal state flags SS_* */
78 int so_qstate; /* (e) internal state flags SQ_* */
79 void *so_pcb; /* protocol control block */
80 struct vnet *so_vnet; /* (a) network stack instance */
81 struct protosw *so_proto; /* (a) protocol handle */
82 /*
83 * Variables for connection queuing.
84 * Socket where accepts occur is so_head in all subsidiary sockets.
85 * If so_head is 0, socket is not related to an accept.
86 * For head socket so_incomp queues partially completed connections,
87 * while so_comp is a queue of connections ready to be accepted.
88 * If a connection is aborted and it has so_head set, then
89 * it has to be pulled out of either so_incomp or so_comp.
90 * We allow connections to queue up based on current queue lengths
91 * and limit on number of queued connections for this socket.
92 */
93 struct socket *so_head; /* (e) back pointer to listen socket */
94 TAILQ_HEAD(, socket) so_incomp; /* (e) queue of partial unaccepted connections */
95 TAILQ_HEAD(, socket) so_comp; /* (e) queue of complete unaccepted connections */
96 TAILQ_ENTRY(socket) so_list; /* (e) list of unaccepted connections */
97 u_int so_qlen; /* (e) number of unaccepted connections */
98 u_int so_incqlen; /* (e) number of unaccepted incomplete
99 connections */
100 u_int so_qlimit; /* (e) max number queued connections */
101 short so_timeo; /* (g) connection timeout */
102 u_short so_error; /* (f) error affecting connection */
103 struct sigio *so_sigio; /* [sg] information for async I/O or
104 out of band data (SIGURG) */
105 u_long so_oobmark; /* (c) chars to oob mark */
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 struct osd osd; /* Object Specific extensions */
121 /*
122 * so_fibnum, so_user_cookie and friends can be used to attach
123 * some user-specified metadata to a socket, which then can be
124 * used by the kernel for various actions.
125 * so_user_cookie is used by ipfw/dummynet.
126 */
127 int so_fibnum; /* routing domain for this socket */
128 uint32_t so_user_cookie;
129
130 int so_ts_clock; /* type of the clock used for timestamps */
131
132 void *so_pspare[2]; /* packet pacing / general use */
133 int so_ispare[2]; /* packet pacing / general use */
134 };
135
136 /*
137 * Global accept mutex to serialize access to accept queues and
138 * fields associated with multiple sockets. This allows us to
139 * avoid defining a lock order between listen and accept sockets
140 * until such time as it proves to be a good idea.
141 */
142 extern struct mtx accept_mtx;
143 #define ACCEPT_LOCK_ASSERT() mtx_assert(&accept_mtx, MA_OWNED)
144 #define ACCEPT_UNLOCK_ASSERT() mtx_assert(&accept_mtx, MA_NOTOWNED)
145 #define ACCEPT_LOCK() mtx_lock(&accept_mtx)
146 #define ACCEPT_UNLOCK() mtx_unlock(&accept_mtx)
147
148 /*
149 * Per-socket mutex: we reuse the receive socket buffer mutex for space
150 * efficiency. This decision should probably be revisited as we optimize
151 * locking for the socket code.
152 */
153 #define SOCK_MTX(_so) SOCKBUF_MTX(&(_so)->so_rcv)
154 #define SOCK_LOCK(_so) SOCKBUF_LOCK(&(_so)->so_rcv)
155 #define SOCK_OWNED(_so) SOCKBUF_OWNED(&(_so)->so_rcv)
156 #define SOCK_UNLOCK(_so) SOCKBUF_UNLOCK(&(_so)->so_rcv)
157 #define SOCK_LOCK_ASSERT(_so) SOCKBUF_LOCK_ASSERT(&(_so)->so_rcv)
158
159 /*
160 * Socket state bits stored in so_qstate.
161 */
162 #define SQ_INCOMP 0x0800 /* unaccepted, incomplete connection */
163 #define SQ_COMP 0x1000 /* unaccepted, complete connection */
164
165 /*
166 * Externalized form of struct socket used by the sysctl(3) interface.
167 */
168 struct xsocket {
169 size_t xso_len; /* length of this structure */
170 struct socket *xso_so; /* makes a convenient handle sometimes */
171 short so_type;
172 short so_options;
173 short so_linger;
174 short so_state;
175 caddr_t so_pcb; /* another convenient handle */
176 int xso_protocol;
177 int xso_family;
178 u_int so_qlen;
179 u_int so_incqlen;
180 u_int so_qlimit;
181 short so_timeo;
182 u_short so_error;
183 pid_t so_pgid;
184 u_long so_oobmark;
185 struct xsockbuf so_rcv, so_snd;
186 uid_t so_uid; /* XXX */
187 };
188
189 #ifdef _KERNEL
190
191 /*
192 * Macros for sockets and socket buffering.
193 */
194
195 /*
196 * Flags to sblock().
197 */
198 #define SBL_WAIT 0x00000001 /* Wait if not immediately available. */
199 #define SBL_NOINTR 0x00000002 /* Force non-interruptible sleep. */
200 #define SBL_VALID (SBL_WAIT | SBL_NOINTR)
201
202 /*
203 * Do we need to notify the other side when I/O is possible?
204 */
205 #define sb_notify(sb) (((sb)->sb_flags & (SB_WAIT | SB_SEL | SB_ASYNC | \
206 SB_UPCALL | SB_AIO | SB_KNOTE)) != 0)
207
208 /* do we have to send all at once on a socket? */
209 #define sosendallatonce(so) \
210 ((so)->so_proto->pr_flags & PR_ATOMIC)
211
212 /* can we read something from so? */
213 #define soreadabledata(so) \
214 (sbavail(&(so)->so_rcv) >= (so)->so_rcv.sb_lowat || \
215 !TAILQ_EMPTY(&(so)->so_comp) || (so)->so_error)
216 #define soreadable(so) \
217 (soreadabledata(so) || ((so)->so_rcv.sb_state & SBS_CANTRCVMORE))
218
219 /* can we write something to so? */
220 #define sowriteable(so) \
221 ((sbspace(&(so)->so_snd) >= (so)->so_snd.sb_lowat && \
222 (((so)->so_state&SS_ISCONNECTED) || \
223 ((so)->so_proto->pr_flags&PR_CONNREQUIRED)==0)) || \
224 ((so)->so_snd.sb_state & SBS_CANTSENDMORE) || \
225 (so)->so_error)
226
227 /*
228 * soref()/sorele() ref-count the socket structure. Note that you must
229 * still explicitly close the socket, but the last ref count will free
230 * the structure.
231 */
232 #define soref(so) do { \
233 SOCK_LOCK_ASSERT(so); \
234 ++(so)->so_count; \
235 } while (0)
236
237 #define sorele(so) do { \
238 ACCEPT_LOCK_ASSERT(); \
239 SOCK_LOCK_ASSERT(so); \
240 if ((so)->so_count <= 0) \
241 panic("sorele"); \
242 if (--(so)->so_count == 0) \
243 sofree(so); \
244 else { \
245 SOCK_UNLOCK(so); \
246 ACCEPT_UNLOCK(); \
247 } \
248 } while (0)
249
250 /*
251 * In sorwakeup() and sowwakeup(), acquire the socket buffer lock to
252 * avoid a non-atomic test-and-wakeup. However, sowakeup is
253 * responsible for releasing the lock if it is called. We unlock only
254 * if we don't call into sowakeup. If any code is introduced that
255 * directly invokes the underlying sowakeup() primitives, it must
256 * maintain the same semantics.
257 */
258 #define sorwakeup_locked(so) do { \
259 SOCKBUF_LOCK_ASSERT(&(so)->so_rcv); \
260 if (sb_notify(&(so)->so_rcv)) \
261 sowakeup((so), &(so)->so_rcv); \
262 else \
263 SOCKBUF_UNLOCK(&(so)->so_rcv); \
264 } while (0)
265
266 #define sorwakeup(so) do { \
267 SOCKBUF_LOCK(&(so)->so_rcv); \
268 sorwakeup_locked(so); \
269 } while (0)
270
271 #define sowwakeup_locked(so) do { \
272 SOCKBUF_LOCK_ASSERT(&(so)->so_snd); \
273 if (sb_notify(&(so)->so_snd)) \
274 sowakeup((so), &(so)->so_snd); \
275 else \
276 SOCKBUF_UNLOCK(&(so)->so_snd); \
277 } while (0)
278
279 #define sowwakeup(so) do { \
280 SOCKBUF_LOCK(&(so)->so_snd); \
281 sowwakeup_locked(so); \
282 } while (0)
283
284 struct accept_filter {
285 char accf_name[16];
286 int (*accf_callback)
287 (struct socket *so, void *arg, int waitflag);
288 void * (*accf_create)
289 (struct socket *so, char *arg);
290 void (*accf_destroy)
291 (struct socket *so);
292 SLIST_ENTRY(accept_filter) accf_next;
293 };
294
295 #ifdef MALLOC_DECLARE
296 MALLOC_DECLARE(M_ACCF);
297 MALLOC_DECLARE(M_PCB);
298 MALLOC_DECLARE(M_SONAME);
299 #endif
300
301 /*
302 * Socket specific helper hook point identifiers
303 * Do not leave holes in the sequence, hook registration is a loop.
304 */
305 #define HHOOK_SOCKET_OPT 0
306 #define HHOOK_SOCKET_CREATE 1
307 #define HHOOK_SOCKET_RCV 2
308 #define HHOOK_SOCKET_SND 3
309 #define HHOOK_FILT_SOREAD 4
310 #define HHOOK_FILT_SOWRITE 5
311 #define HHOOK_SOCKET_CLOSE 6
312 #define HHOOK_SOCKET_LAST HHOOK_SOCKET_CLOSE
313
314 struct socket_hhook_data {
315 struct socket *so;
316 struct mbuf *m;
317 void *hctx; /* hook point specific data*/
318 int status;
319 };
320
321 extern int maxsockets;
322 extern u_long sb_max;
323 extern so_gen_t so_gencnt;
324
325 struct file;
326 struct filecaps;
327 struct filedesc;
328 struct mbuf;
329 struct sockaddr;
330 struct ucred;
331 struct uio;
332
333 /* 'which' values for socket upcalls. */
334 #define SO_RCV 1
335 #define SO_SND 2
336
337 /* Return values for socket upcalls. */
338 #define SU_OK 0
339 #define SU_ISCONNECTED 1
340
341 /*
342 * From uipc_socket and friends
343 */
344 int getsockaddr(struct sockaddr **namp, caddr_t uaddr, size_t len);
345 int getsock_cap(struct thread *td, int fd, cap_rights_t *rightsp,
346 struct file **fpp, u_int *fflagp, struct filecaps *havecaps);
347 void soabort(struct socket *so);
348 int soaccept(struct socket *so, struct sockaddr **nam);
349 void soaio_enqueue(struct task *task);
350 void soaio_rcv(void *context, int pending);
351 void soaio_snd(void *context, int pending);
352 int socheckuid(struct socket *so, uid_t uid);
353 int sobind(struct socket *so, struct sockaddr *nam, struct thread *td);
354 int sobindat(int fd, struct socket *so, struct sockaddr *nam,
355 struct thread *td);
356 int soclose(struct socket *so);
357 int soconnect(struct socket *so, struct sockaddr *nam, struct thread *td);
358 int soconnectat(int fd, struct socket *so, struct sockaddr *nam,
359 struct thread *td);
360 int soconnect2(struct socket *so1, struct socket *so2);
361 int socreate(int dom, struct socket **aso, int type, int proto,
362 struct ucred *cred, struct thread *td);
363 int sodisconnect(struct socket *so);
364 struct sockaddr *sodupsockaddr(const struct sockaddr *sa, int mflags);
365 void sofree(struct socket *so);
366 void sohasoutofband(struct socket *so);
367 int solisten(struct socket *so, int backlog, struct thread *td);
368 void solisten_proto(struct socket *so, int backlog);
369 int solisten_proto_check(struct socket *so);
370 struct socket *
371 sonewconn(struct socket *head, int connstatus);
372
373
374 int sopoll(struct socket *so, int events, struct ucred *active_cred,
375 struct thread *td);
376 int sopoll_generic(struct socket *so, int events,
377 struct ucred *active_cred, struct thread *td);
378 int soreceive(struct socket *so, struct sockaddr **paddr, struct uio *uio,
379 struct mbuf **mp0, struct mbuf **controlp, int *flagsp);
380 int soreceive_stream(struct socket *so, struct sockaddr **paddr,
381 struct uio *uio, struct mbuf **mp0, struct mbuf **controlp,
382 int *flagsp);
383 int soreceive_dgram(struct socket *so, struct sockaddr **paddr,
384 struct uio *uio, struct mbuf **mp0, struct mbuf **controlp,
385 int *flagsp);
386 int soreceive_generic(struct socket *so, struct sockaddr **paddr,
387 struct uio *uio, struct mbuf **mp0, struct mbuf **controlp,
388 int *flagsp);
389 int soreserve(struct socket *so, u_long sndcc, u_long rcvcc);
390 void sorflush(struct socket *so);
391 int sosend(struct socket *so, struct sockaddr *addr, struct uio *uio,
392 struct mbuf *top, struct mbuf *control, int flags,
393 struct thread *td);
394 int sosend_dgram(struct socket *so, struct sockaddr *addr,
395 struct uio *uio, struct mbuf *top, struct mbuf *control,
396 int flags, struct thread *td);
397 int sosend_generic(struct socket *so, struct sockaddr *addr,
398 struct uio *uio, struct mbuf *top, struct mbuf *control,
399 int flags, struct thread *td);
400 int soshutdown(struct socket *so, int how);
401 void sotoxsocket(struct socket *so, struct xsocket *xso);
402 void soupcall_clear(struct socket *so, int which);
403 void soupcall_set(struct socket *so, int which,
404 int (*func)(struct socket *, void *, int), void *arg);
405 void sowakeup(struct socket *so, struct sockbuf *sb);
406 void sowakeup_aio(struct socket *so, struct sockbuf *sb);
407 int selsocket(struct socket *so, int events, struct timeval *tv,
408 struct thread *td);
409
410 /*
411 * Accept filter functions (duh).
412 */
413 int accept_filt_add(struct accept_filter *filt);
414 int accept_filt_del(char *name);
415 struct accept_filter *accept_filt_get(char *name);
416 #ifdef ACCEPT_FILTER_MOD
417 #ifdef SYSCTL_DECL
418 SYSCTL_DECL(_net_inet_accf);
419 #endif
420 int accept_filt_generic_mod_event(module_t mod, int event, void *data);
421 #endif
422
423 #endif /* _KERNEL */
424
425 #endif /* !_SYS_SOCKETVAR_H_ */
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