source: rtems-libbsd/freebsd/sys/sys/socketvar.h @ 334019d

55-freebsd-126-freebsd-12
Last change on this file since 334019d was de8a76d, checked in by Sebastian Huber <sebastian.huber@…>, on 04/04/17 at 07:36:57

Update to FreeBSD head 2017-04-04

Git mirror commit 642b174daddbd0efd9bb5f242c43f4ab4db6869f.
  • Property mode set to 100644
File size: 14.6 KB
Line 
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. 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
50struct 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 */
58typedef u_quad_t so_gen_t;
59
60struct 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 */
72struct 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        uint32_t so_max_pacing_rate;    /* (f) TX rate limit in bytes/s */
132
133        void *so_pspare[2];     /* general use */
134        int so_ispare[2];       /* general use */
135};
136
137/*
138 * Global accept mutex to serialize access to accept queues and
139 * fields associated with multiple sockets.  This allows us to
140 * avoid defining a lock order between listen and accept sockets
141 * until such time as it proves to be a good idea.
142 */
143extern struct mtx accept_mtx;
144#define ACCEPT_LOCK_ASSERT()            mtx_assert(&accept_mtx, MA_OWNED)
145#define ACCEPT_UNLOCK_ASSERT()          mtx_assert(&accept_mtx, MA_NOTOWNED)
146#define ACCEPT_LOCK()                   mtx_lock(&accept_mtx)
147#define ACCEPT_UNLOCK()                 mtx_unlock(&accept_mtx)
148
149/*
150 * Per-socket mutex: we reuse the receive socket buffer mutex for space
151 * efficiency.  This decision should probably be revisited as we optimize
152 * locking for the socket code.
153 */
154#define SOCK_MTX(_so)                   SOCKBUF_MTX(&(_so)->so_rcv)
155#define SOCK_LOCK(_so)                  SOCKBUF_LOCK(&(_so)->so_rcv)
156#define SOCK_OWNED(_so)                 SOCKBUF_OWNED(&(_so)->so_rcv)
157#define SOCK_UNLOCK(_so)                SOCKBUF_UNLOCK(&(_so)->so_rcv)
158#define SOCK_LOCK_ASSERT(_so)           SOCKBUF_LOCK_ASSERT(&(_so)->so_rcv)
159
160/*
161 * Socket state bits stored in so_qstate.
162 */
163#define SQ_INCOMP               0x0800  /* unaccepted, incomplete connection */
164#define SQ_COMP                 0x1000  /* unaccepted, complete connection */
165
166/*
167 * Externalized form of struct socket used by the sysctl(3) interface.
168 */
169struct xsocket {
170        size_t  xso_len;        /* length of this structure */
171        struct  socket *xso_so; /* makes a convenient handle sometimes */
172        short   so_type;
173        short   so_options;
174        short   so_linger;
175        short   so_state;
176        caddr_t so_pcb;         /* another convenient handle */
177        int     xso_protocol;
178        int     xso_family;
179        u_int   so_qlen;
180        u_int   so_incqlen;
181        u_int   so_qlimit;
182        short   so_timeo;
183        u_short so_error;
184        pid_t   so_pgid;
185        u_long  so_oobmark;
186        struct xsockbuf so_rcv, so_snd;
187        uid_t   so_uid;         /* XXX */
188};
189
190#ifdef _KERNEL
191
192/*
193 * Macros for sockets and socket buffering.
194 */
195
196/*
197 * Flags to sblock().
198 */
199#define SBL_WAIT        0x00000001      /* Wait if not immediately available. */
200#define SBL_NOINTR      0x00000002      /* Force non-interruptible sleep. */
201#define SBL_VALID       (SBL_WAIT | SBL_NOINTR)
202
203/*
204 * Do we need to notify the other side when I/O is possible?
205 */
206#define sb_notify(sb)   (((sb)->sb_flags & (SB_WAIT | SB_SEL | SB_ASYNC | \
207    SB_UPCALL | SB_AIO | SB_KNOTE)) != 0)
208
209/* do we have to send all at once on a socket? */
210#define sosendallatonce(so) \
211    ((so)->so_proto->pr_flags & PR_ATOMIC)
212
213/* can we read something from so? */
214#define soreadabledata(so) \
215    (sbavail(&(so)->so_rcv) >= (so)->so_rcv.sb_lowat || \
216        !TAILQ_EMPTY(&(so)->so_comp) || (so)->so_error)
217#define soreadable(so) \
218        (soreadabledata(so) || ((so)->so_rcv.sb_state & SBS_CANTRCVMORE))
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_snd.sb_state & SBS_CANTSENDMORE) || \
226     (so)->so_error)
227
228/*
229 * soref()/sorele() ref-count the socket structure.  Note that you must
230 * still explicitly close the socket, but the last ref count will free
231 * the structure.
232 */
233#define soref(so) do {                                                  \
234        SOCK_LOCK_ASSERT(so);                                           \
235        ++(so)->so_count;                                               \
236} while (0)
237
238#define sorele(so) do {                                                 \
239        ACCEPT_LOCK_ASSERT();                                           \
240        SOCK_LOCK_ASSERT(so);                                           \
241        if ((so)->so_count <= 0)                                        \
242                panic("sorele");                                        \
243        if (--(so)->so_count == 0)                                      \
244                sofree(so);                                             \
245        else {                                                          \
246                SOCK_UNLOCK(so);                                        \
247                ACCEPT_UNLOCK();                                        \
248        }                                                               \
249} while (0)
250
251/*
252 * In sorwakeup() and sowwakeup(), acquire the socket buffer lock to
253 * avoid a non-atomic test-and-wakeup.  However, sowakeup is
254 * responsible for releasing the lock if it is called.  We unlock only
255 * if we don't call into sowakeup.  If any code is introduced that
256 * directly invokes the underlying sowakeup() primitives, it must
257 * maintain the same semantics.
258 */
259#define sorwakeup_locked(so) do {                                       \
260        SOCKBUF_LOCK_ASSERT(&(so)->so_rcv);                             \
261        if (sb_notify(&(so)->so_rcv))                                   \
262                sowakeup((so), &(so)->so_rcv);                          \
263        else                                                            \
264                SOCKBUF_UNLOCK(&(so)->so_rcv);                          \
265} while (0)
266
267#define sorwakeup(so) do {                                              \
268        SOCKBUF_LOCK(&(so)->so_rcv);                                    \
269        sorwakeup_locked(so);                                           \
270} while (0)
271
272#define sowwakeup_locked(so) do {                                       \
273        SOCKBUF_LOCK_ASSERT(&(so)->so_snd);                             \
274        if (sb_notify(&(so)->so_snd))                                   \
275                sowakeup((so), &(so)->so_snd);                          \
276        else                                                            \
277                SOCKBUF_UNLOCK(&(so)->so_snd);                          \
278} while (0)
279
280#define sowwakeup(so) do {                                              \
281        SOCKBUF_LOCK(&(so)->so_snd);                                    \
282        sowwakeup_locked(so);                                           \
283} while (0)
284
285struct accept_filter {
286        char    accf_name[16];
287        int     (*accf_callback)
288                (struct socket *so, void *arg, int waitflag);
289        void *  (*accf_create)
290                (struct socket *so, char *arg);
291        void    (*accf_destroy)
292                (struct socket *so);
293        SLIST_ENTRY(accept_filter) accf_next;
294};
295
296#ifdef MALLOC_DECLARE
297MALLOC_DECLARE(M_ACCF);
298MALLOC_DECLARE(M_PCB);
299MALLOC_DECLARE(M_SONAME);
300#endif
301
302/*
303 * Socket specific helper hook point identifiers
304 * Do not leave holes in the sequence, hook registration is a loop.
305 */
306#define HHOOK_SOCKET_OPT                0
307#define HHOOK_SOCKET_CREATE             1
308#define HHOOK_SOCKET_RCV                2
309#define HHOOK_SOCKET_SND                3
310#define HHOOK_FILT_SOREAD               4
311#define HHOOK_FILT_SOWRITE              5
312#define HHOOK_SOCKET_CLOSE              6
313#define HHOOK_SOCKET_LAST               HHOOK_SOCKET_CLOSE
314
315struct socket_hhook_data {
316        struct socket   *so;
317        struct mbuf     *m;
318        void            *hctx;          /* hook point specific data*/
319        int             status;
320};
321
322extern int      maxsockets;
323extern u_long   sb_max;
324extern so_gen_t so_gencnt;
325
326struct file;
327struct filecaps;
328struct filedesc;
329struct mbuf;
330struct sockaddr;
331struct ucred;
332struct uio;
333
334/* 'which' values for socket upcalls. */
335#define SO_RCV          1
336#define SO_SND          2
337
338/* Return values for socket upcalls. */
339#define SU_OK           0
340#define SU_ISCONNECTED  1
341
342/*
343 * From uipc_socket and friends
344 */
345int     getsockaddr(struct sockaddr **namp, caddr_t uaddr, size_t len);
346int     getsock_cap(struct thread *td, int fd, cap_rights_t *rightsp,
347            struct file **fpp, u_int *fflagp, struct filecaps *havecaps);
348void    soabort(struct socket *so);
349int     soaccept(struct socket *so, struct sockaddr **nam);
350void    soaio_enqueue(struct task *task);
351void    soaio_rcv(void *context, int pending);
352void    soaio_snd(void *context, int pending);
353int     socheckuid(struct socket *so, uid_t uid);
354int     sobind(struct socket *so, struct sockaddr *nam, struct thread *td);
355int     sobindat(int fd, struct socket *so, struct sockaddr *nam,
356            struct thread *td);
357int     soclose(struct socket *so);
358int     soconnect(struct socket *so, struct sockaddr *nam, struct thread *td);
359int     soconnectat(int fd, struct socket *so, struct sockaddr *nam,
360            struct thread *td);
361int     soconnect2(struct socket *so1, struct socket *so2);
362int     socreate(int dom, struct socket **aso, int type, int proto,
363            struct ucred *cred, struct thread *td);
364int     sodisconnect(struct socket *so);
365struct  sockaddr *sodupsockaddr(const struct sockaddr *sa, int mflags);
366void    sofree(struct socket *so);
367void    sohasoutofband(struct socket *so);
368int     solisten(struct socket *so, int backlog, struct thread *td);
369void    solisten_proto(struct socket *so, int backlog);
370int     solisten_proto_check(struct socket *so);
371struct socket *
372        sonewconn(struct socket *head, int connstatus);
373
374
375int     sopoll(struct socket *so, int events, struct ucred *active_cred,
376            struct thread *td);
377int     sopoll_generic(struct socket *so, int events,
378            struct ucred *active_cred, struct thread *td);
379int     soreceive(struct socket *so, struct sockaddr **paddr, struct uio *uio,
380            struct mbuf **mp0, struct mbuf **controlp, int *flagsp);
381int     soreceive_stream(struct socket *so, struct sockaddr **paddr,
382            struct uio *uio, struct mbuf **mp0, struct mbuf **controlp,
383            int *flagsp);
384int     soreceive_dgram(struct socket *so, struct sockaddr **paddr,
385            struct uio *uio, struct mbuf **mp0, struct mbuf **controlp,
386            int *flagsp);
387int     soreceive_generic(struct socket *so, struct sockaddr **paddr,
388            struct uio *uio, struct mbuf **mp0, struct mbuf **controlp,
389            int *flagsp);
390int     soreserve(struct socket *so, u_long sndcc, u_long rcvcc);
391void    sorflush(struct socket *so);
392int     sosend(struct socket *so, struct sockaddr *addr, struct uio *uio,
393            struct mbuf *top, struct mbuf *control, int flags,
394            struct thread *td);
395int     sosend_dgram(struct socket *so, struct sockaddr *addr,
396            struct uio *uio, struct mbuf *top, struct mbuf *control,
397            int flags, struct thread *td);
398int     sosend_generic(struct socket *so, struct sockaddr *addr,
399            struct uio *uio, struct mbuf *top, struct mbuf *control,
400            int flags, struct thread *td);
401int     soshutdown(struct socket *so, int how);
402void    sotoxsocket(struct socket *so, struct xsocket *xso);
403void    soupcall_clear(struct socket *so, int which);
404void    soupcall_set(struct socket *so, int which,
405            int (*func)(struct socket *, void *, int), void *arg);
406void    sowakeup(struct socket *so, struct sockbuf *sb);
407#ifndef __rtems__
408void    sowakeup_aio(struct socket *so, struct sockbuf *sb);
409#else /* __rtems__ */
410#define sowakeup_aio(so, sb) (void)0
411#endif /* __rtems__ */
412int     selsocket(struct socket *so, int events, struct timeval *tv,
413            struct thread *td);
414
415/*
416 * Accept filter functions (duh).
417 */
418int     accept_filt_add(struct accept_filter *filt);
419int     accept_filt_del(char *name);
420struct  accept_filter *accept_filt_get(char *name);
421#ifdef ACCEPT_FILTER_MOD
422#ifdef SYSCTL_DECL
423SYSCTL_DECL(_net_inet_accf);
424#endif
425int     accept_filt_generic_mod_event(module_t mod, int event, void *data);
426#endif
427
428#endif /* _KERNEL */
429
430#endif /* !_SYS_SOCKETVAR_H_ */
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