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 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)socketvar.h 8.3 (Berkeley) 2/19/95
34 * $FreeBSD: releng/5.1/sys/sys/socketvar.h 112778 2003-03-29 06:14:14Z alc $
35 */
36
37 #ifndef _SYS_SOCKETVAR_H_
38 #define _SYS_SOCKETVAR_H_
39
40 #include <sys/_label.h> /* for struct label */
41 #include <sys/queue.h> /* for TAILQ macros */
42 #include <sys/selinfo.h> /* for struct selinfo */
43
44 /*
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.
49 */
50 typedef u_quad_t so_gen_t;
51
52 /*
53 * List of locks:
54 * (c) const, inited in either socreate() or sonewconn()
55 * (m) sb_mtx mutex
56 * (mr) so_rcv.sb_mtx mutex
57 * (sg) sigio_lock sx
58 * (sh) sohead_lock sx
59 *
60 * Lock of so_rcv.sb_mtx can duplicate, provided that sohead_lock
61 * is exclusively locked.
62 *
63 * Brackets mean that this data is not protected yet.
64 */
65 struct socket {
66 int so_count; /* reference count */
67 short so_type; /* generic type, see socket.h */
68 short so_options; /* from socket call, see socket.h */
69 short so_linger; /* time to linger while closing */
70 short so_state; /* internal state flags SS_*, below */
71 void *so_pcb; /* protocol control block */
72 struct protosw *so_proto; /* protocol handle */
73 /*
74 * Variables for connection queuing.
75 * Socket where accepts occur is so_head in all subsidiary sockets.
76 * If so_head is 0, socket is not related to an accept.
77 * For head socket so_incomp queues partially completed connections,
78 * while so_comp is a queue of connections ready to be accepted.
79 * If a connection is aborted and it has so_head set, then
80 * it has to be pulled out of either so_incomp or so_comp.
81 * We allow connections to queue up based on current queue lengths
82 * and limit on number of queued connections for this socket.
83 */
84 struct socket *so_head; /* back pointer to accept socket */
85 TAILQ_HEAD(, socket) so_incomp; /* queue of partial unaccepted connections */
86 TAILQ_HEAD(, socket) so_comp; /* queue of complete unaccepted connections */
87 TAILQ_ENTRY(socket) so_list; /* list of unaccepted connections */
88 short so_qlen; /* number of unaccepted connections */
89 short so_incqlen; /* number of unaccepted incomplete
90 connections */
91 short so_qlimit; /* max number queued connections */
92 short so_timeo; /* connection timeout */
93 u_short so_error; /* error affecting connection */
94 struct sigio *so_sigio; /* [sg] information for async I/O or
95 out of band data (SIGURG) */
96 u_long so_oobmark; /* chars to oob mark */
97 TAILQ_HEAD(, aiocblist) so_aiojobq; /* AIO ops waiting on socket */
98 /*
99 * Variables for socket buffering.
100 */
101 struct sockbuf {
102 struct selinfo sb_sel; /* process selecting read/write */
103 struct mbuf *sb_mb; /* the mbuf chain */
104 u_int sb_cc; /* actual chars in buffer */
105 u_int sb_hiwat; /* max actual char count */
106 u_int sb_mbcnt; /* chars of mbufs used */
107 u_int sb_mbmax; /* max chars of mbufs to use */
108 u_int sb_ctl; /* non-data chars in buffer */
109 int sb_lowat; /* low water mark */
110 int sb_timeo; /* timeout for read/write */
111 short sb_flags; /* flags, see below */
112 } so_rcv, so_snd;
113 #define SB_MAX (256*1024) /* default for max chars in sockbuf */
114 #define SB_LOCK 0x01 /* lock on data queue */
115 #define SB_WANT 0x02 /* someone is waiting to lock */
116 #define SB_WAIT 0x04 /* someone is waiting for data/space */
117 #define SB_SEL 0x08 /* someone is selecting */
118 #define SB_ASYNC 0x10 /* ASYNC I/O, need signals */
119 #define SB_UPCALL 0x20 /* someone wants an upcall */
120 #define SB_NOINTR 0x40 /* operations not interruptible */
121 #define SB_AIO 0x80 /* AIO operations queued */
122 #define SB_KNOTE 0x100 /* kernel note attached */
123
124 void (*so_upcall)(struct socket *, void *, int);
125 void *so_upcallarg;
126 struct ucred *so_cred; /* user credentials */
127 struct label so_label; /* MAC label for socket */
128 struct label so_peerlabel; /* cached MAC label for socket peer */
129 /* NB: generation count must not be first; easiest to make it last. */
130 so_gen_t so_gencnt; /* generation count */
131 void *so_emuldata; /* private data for emulators */
132 struct so_accf {
133 struct accept_filter *so_accept_filter;
134 void *so_accept_filter_arg; /* saved filter args */
135 char *so_accept_filter_str; /* saved user args */
136 } *so_accf;
137 };
138
139 /*
140 * Socket state bits.
141 */
142 #define SS_NOFDREF 0x0001 /* no file table ref any more */
143 #define SS_ISCONNECTED 0x0002 /* socket connected to a peer */
144 #define SS_ISCONNECTING 0x0004 /* in process of connecting to peer */
145 #define SS_ISDISCONNECTING 0x0008 /* in process of disconnecting */
146 #define SS_CANTSENDMORE 0x0010 /* can't send more data to peer */
147 #define SS_CANTRCVMORE 0x0020 /* can't receive more data from peer */
148 #define SS_RCVATMARK 0x0040 /* at mark on input */
149
150 #define SS_NBIO 0x0100 /* non-blocking ops */
151 #define SS_ASYNC 0x0200 /* async i/o notify */
152 #define SS_ISCONFIRMING 0x0400 /* deciding to accept connection req */
153
154 #define SS_INCOMP 0x0800 /* unaccepted, incomplete connection */
155 #define SS_COMP 0x1000 /* unaccepted, complete connection */
156 #define SS_ISDISCONNECTED 0x2000 /* socket disconnected from peer */
157
158 /*
159 * Externalized form of struct socket used by the sysctl(3) interface.
160 */
161 struct xsocket {
162 size_t xso_len; /* length of this structure */
163 struct socket *xso_so; /* makes a convenient handle sometimes */
164 short so_type;
165 short so_options;
166 short so_linger;
167 short so_state;
168 caddr_t so_pcb; /* another convenient handle */
169 int xso_protocol;
170 int xso_family;
171 short so_qlen;
172 short so_incqlen;
173 short so_qlimit;
174 short so_timeo;
175 u_short so_error;
176 pid_t so_pgid;
177 u_long so_oobmark;
178 struct xsockbuf {
179 u_int sb_cc;
180 u_int sb_hiwat;
181 u_int sb_mbcnt;
182 u_int sb_mbmax;
183 int sb_lowat;
184 int sb_timeo;
185 short sb_flags;
186 } so_rcv, so_snd;
187 uid_t so_uid; /* XXX */
188 };
189
190 /*
191 * Macros for sockets and socket buffering.
192 */
193
194 /*
195 * Do we need to notify the other side when I/O is possible?
196 */
197 #define sb_notify(sb) (((sb)->sb_flags & (SB_WAIT | SB_SEL | SB_ASYNC | \
198 SB_UPCALL | SB_AIO | SB_KNOTE)) != 0)
199
200 /*
201 * How much space is there in a socket buffer (so->so_snd or so->so_rcv)?
202 * This is problematical if the fields are unsigned, as the space might
203 * still be negative (cc > hiwat or mbcnt > mbmax). Should detect
204 * overflow and return 0. Should use "lmin" but it doesn't exist now.
205 */
206 #define sbspace(sb) \
207 ((long) imin((int)((sb)->sb_hiwat - (sb)->sb_cc), \
208 (int)((sb)->sb_mbmax - (sb)->sb_mbcnt)))
209
210 /* do we have to send all at once on a socket? */
211 #define sosendallatonce(so) \
212 ((so)->so_proto->pr_flags & PR_ATOMIC)
213
214 /* can we read something from so? */
215 #define soreadable(so) \
216 ((so)->so_rcv.sb_cc >= (so)->so_rcv.sb_lowat || \
217 ((so)->so_state & SS_CANTRCVMORE) || \
218 !TAILQ_EMPTY(&(so)->so_comp) || (so)->so_error)
219
220 /* can we write something to so? */
221 #define sowriteable(so) \
222 ((sbspace(&(so)->so_snd) >= (so)->so_snd.sb_lowat && \
223 (((so)->so_state&SS_ISCONNECTED) || \
224 ((so)->so_proto->pr_flags&PR_CONNREQUIRED)==0)) || \
225 ((so)->so_state & SS_CANTSENDMORE) || \
226 (so)->so_error)
227
228 /* adjust counters in sb reflecting allocation of m */
229 #define sballoc(sb, m) { \
230 (sb)->sb_cc += (m)->m_len; \
231 if ((m)->m_type != MT_DATA && (m)->m_type != MT_HEADER && \
232 (m)->m_type != MT_OOBDATA) \
233 (sb)->sb_ctl += (m)->m_len; \
234 (sb)->sb_mbcnt += MSIZE; \
235 if ((m)->m_flags & M_EXT) \
236 (sb)->sb_mbcnt += (m)->m_ext.ext_size; \
237 }
238
239 /* adjust counters in sb reflecting freeing of m */
240 #define sbfree(sb, m) { \
241 (sb)->sb_cc -= (m)->m_len; \
242 if ((m)->m_type != MT_DATA && (m)->m_type != MT_HEADER && \
243 (m)->m_type != MT_OOBDATA) \
244 (sb)->sb_ctl -= (m)->m_len; \
245 (sb)->sb_mbcnt -= MSIZE; \
246 if ((m)->m_flags & M_EXT) \
247 (sb)->sb_mbcnt -= (m)->m_ext.ext_size; \
248 }
249
250 /*
251 * Set lock on sockbuf sb; sleep if lock is already held.
252 * Unless SB_NOINTR is set on sockbuf, sleep is interruptible.
253 * Returns error without lock if sleep is interrupted.
254 */
255 #define sblock(sb, wf) ((sb)->sb_flags & SB_LOCK ? \
256 (((wf) == M_WAITOK) ? sb_lock(sb) : EWOULDBLOCK) : \
257 ((sb)->sb_flags |= SB_LOCK), 0)
258
259 /* release lock on sockbuf sb */
260 #define sbunlock(sb) { \
261 (sb)->sb_flags &= ~SB_LOCK; \
262 if ((sb)->sb_flags & SB_WANT) { \
263 (sb)->sb_flags &= ~SB_WANT; \
264 wakeup(&(sb)->sb_flags); \
265 } \
266 }
267
268 /*
269 * soref()/sorele() ref-count the socket structure. Note that you must
270 * still explicitly close the socket, but the last ref count will free
271 * the structure.
272 */
273 #define soref(so) do { \
274 ++(so)->so_count; \
275 } while (0)
276
277 #define sorele(so) do { \
278 if ((so)->so_count <= 0) \
279 panic("sorele");\
280 if (--(so)->so_count == 0)\
281 sofree(so); \
282 } while (0)
283
284 #define sotryfree(so) do { \
285 if ((so)->so_count == 0) \
286 sofree(so); \
287 } while(0)
288
289 #define sorwakeup(so) do { \
290 if (sb_notify(&(so)->so_rcv)) \
291 sowakeup((so), &(so)->so_rcv); \
292 } while (0)
293
294 #define sowwakeup(so) do { \
295 if (sb_notify(&(so)->so_snd)) \
296 sowakeup((so), &(so)->so_snd); \
297 } while (0)
298
299 #ifdef _KERNEL
300
301 /*
302 * Argument structure for sosetopt et seq. This is in the KERNEL
303 * section because it will never be visible to user code.
304 */
305 enum sopt_dir { SOPT_GET, SOPT_SET };
306 struct sockopt {
307 enum sopt_dir sopt_dir; /* is this a get or a set? */
308 int sopt_level; /* second arg of [gs]etsockopt */
309 int sopt_name; /* third arg of [gs]etsockopt */
310 void *sopt_val; /* fourth arg of [gs]etsockopt */
311 size_t sopt_valsize; /* (almost) fifth arg of [gs]etsockopt */
312 struct thread *sopt_td; /* calling thread or null if kernel */
313 };
314
315 struct sf_buf {
316 SLIST_ENTRY(sf_buf) free_list; /* list of free buffer slots */
317 struct vm_page *m; /* currently mapped page */
318 vm_offset_t kva; /* va of mapping */
319 };
320
321 struct accept_filter {
322 char accf_name[16];
323 void (*accf_callback)
324 (struct socket *so, void *arg, int waitflag);
325 void * (*accf_create)
326 (struct socket *so, char *arg);
327 void (*accf_destroy)
328 (struct socket *so);
329 SLIST_ENTRY(accept_filter) accf_next;
330 };
331
332 #ifdef MALLOC_DECLARE
333 MALLOC_DECLARE(M_ACCF);
334 MALLOC_DECLARE(M_PCB);
335 MALLOC_DECLARE(M_SONAME);
336 #endif
337
338 extern int maxsockets;
339 extern u_long sb_max;
340 extern struct uma_zone *socket_zone;
341 extern so_gen_t so_gencnt;
342
343 struct mbuf;
344 struct sockaddr;
345 struct ucred;
346 struct uio;
347
348 /*
349 * From uipc_socket and friends
350 */
351 struct sockaddr *dup_sockaddr(struct sockaddr *sa, int canwait);
352 int sockargs(struct mbuf **mp, caddr_t buf, int buflen, int type);
353 int getsockaddr(struct sockaddr **namp, caddr_t uaddr, size_t len);
354 void sbappend(struct sockbuf *sb, struct mbuf *m);
355 int sbappendaddr(struct sockbuf *sb, struct sockaddr *asa,
356 struct mbuf *m0, struct mbuf *control);
357 int sbappendcontrol(struct sockbuf *sb, struct mbuf *m0,
358 struct mbuf *control);
359 void sbappendrecord(struct sockbuf *sb, struct mbuf *m0);
360 void sbcheck(struct sockbuf *sb);
361 void sbcompress(struct sockbuf *sb, struct mbuf *m, struct mbuf *n);
362 struct mbuf *
363 sbcreatecontrol(caddr_t p, int size, int type, int level);
364 void sbdrop(struct sockbuf *sb, int len);
365 void sbdroprecord(struct sockbuf *sb);
366 void sbflush(struct sockbuf *sb);
367 void sbinsertoob(struct sockbuf *sb, struct mbuf *m0);
368 void sbrelease(struct sockbuf *sb, struct socket *so);
369 int sbreserve(struct sockbuf *sb, u_long cc, struct socket *so,
370 struct thread *td);
371 void sbtoxsockbuf(struct sockbuf *sb, struct xsockbuf *xsb);
372 int sbwait(struct sockbuf *sb);
373 struct sf_buf *
374 sf_buf_alloc(struct vm_page *m);
375 void sf_buf_free(void *addr, void *args);
376 int sb_lock(struct sockbuf *sb);
377 int soabort(struct socket *so);
378 int soaccept(struct socket *so, struct sockaddr **nam);
379 int socheckuid(struct socket *so, uid_t uid);
380 struct socket *soalloc(int waitok);
381 int sobind(struct socket *so, struct sockaddr *nam, struct thread *td);
382 void socantrcvmore(struct socket *so);
383 void socantsendmore(struct socket *so);
384 int soclose(struct socket *so);
385 int soconnect(struct socket *so, struct sockaddr *nam, struct thread *td);
386 int soconnect2(struct socket *so1, struct socket *so2);
387 int socow_setup(struct mbuf *m0, struct uio *uio);
388 int socreate(int dom, struct socket **aso, int type, int proto,
389 struct ucred *cred, struct thread *td);
390 void sodealloc(struct socket *so);
391 int sodisconnect(struct socket *so);
392 void sofree(struct socket *so);
393 int sogetopt(struct socket *so, struct sockopt *sopt);
394 void sohasoutofband(struct socket *so);
395 void soisconnected(struct socket *so);
396 void soisconnecting(struct socket *so);
397 void soisdisconnected(struct socket *so);
398 void soisdisconnecting(struct socket *so);
399 int solisten(struct socket *so, int backlog, struct thread *td);
400 struct socket *
401 sonewconn(struct socket *head, int connstatus);
402 int sooptcopyin(struct sockopt *sopt, void *buf, size_t len, size_t minlen);
403 int sooptcopyout(struct sockopt *sopt, void *buf, size_t len);
404
405 /* XXX; prepare mbuf for (__FreeBSD__ < 3) routines. */
406 int soopt_getm(struct sockopt *sopt, struct mbuf **mp);
407 int soopt_mcopyin(struct sockopt *sopt, struct mbuf *m);
408 int soopt_mcopyout(struct sockopt *sopt, struct mbuf *m);
409
410 int sopoll(struct socket *so, int events, struct ucred *active_cred,
411 struct thread *td);
412 int soreceive(struct socket *so, struct sockaddr **paddr, struct uio *uio,
413 struct mbuf **mp0, struct mbuf **controlp, int *flagsp);
414 int soreserve(struct socket *so, u_long sndcc, u_long rcvcc);
415 void sorflush(struct socket *so);
416 int sosend(struct socket *so, struct sockaddr *addr, struct uio *uio,
417 struct mbuf *top, struct mbuf *control, int flags,
418 struct thread *td);
419 int sosetopt(struct socket *so, struct sockopt *sopt);
420 int soshutdown(struct socket *so, int how);
421 void sotoxsocket(struct socket *so, struct xsocket *xso);
422 void sowakeup(struct socket *so, struct sockbuf *sb);
423
424 /*
425 * Accept filter functions (duh).
426 */
427 int accept_filt_add(struct accept_filter *filt);
428 int accept_filt_del(char *name);
429 struct accept_filter *accept_filt_get(char *name);
430 #ifdef ACCEPT_FILTER_MOD
431 #ifdef SYSCTL_DECL
432 SYSCTL_DECL(_net_inet_accf);
433 #endif
434 int accept_filt_generic_mod_event(module_t mod, int event, void *data);
435 #endif
436
437 #endif /* _KERNEL */
438
439 #endif /* !_SYS_SOCKETVAR_H_ */
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