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31 * @(#)socketvar.h 8.3 (Berkeley) 2/19/95
36 #ifndef _SYS_SOCKETVAR_H_
37 #define _SYS_SOCKETVAR_H_
40 * Socket generation count type. Also used in xinpcb, xtcpcb, xunpcb.
42 typedef uint64_t so_gen_t;
44 #if defined(_KERNEL) || defined(_WANT_SOCKET)
45 #include <sys/queue.h> /* for TAILQ macros */
46 #include <sys/selinfo.h> /* for struct selinfo */
47 #include <sys/_lock.h>
48 #include <sys/_mutex.h>
51 #include <sys/sockbuf.h>
53 #include <sys/caprights.h>
54 #include <sys/sockopt.h>
60 * Kernel structure per socket.
61 * Contains send and receive buffer queues,
62 * handle on protocol and pointer to protocol
63 * private data and error information.
65 typedef int so_upcall_t(struct socket *, void *, int);
66 typedef void so_dtor_t(struct socket *);
71 * Locking key to struct socket:
72 * (a) constant after allocation, no locking required.
73 * (b) locked by SOCK_LOCK(so).
74 * (cr) locked by SOCKBUF_LOCK(&so->so_rcv).
75 * (cs) locked by SOCKBUF_LOCK(&so->so_snd).
76 * (e) locked by SOLISTEN_LOCK() of corresponding listening socket.
77 * (f) not locked since integer reads/writes are atomic.
78 * (g) used only as a sleep/wakeup address, no value.
79 * (h) locked by global mutex so_global_mtx.
81 TAILQ_HEAD(accept_queue, socket);
84 volatile u_int so_count; /* (b / refcount) */
85 struct selinfo so_rdsel; /* (b/cr) for so_rcv/so_comp */
86 struct selinfo so_wrsel; /* (b/cs) for so_snd */
87 short so_type; /* (a) generic type, see socket.h */
88 int so_options; /* (b) from socket call, see socket.h */
89 short so_linger; /* time to linger close(2) */
90 short so_state; /* (b) internal state flags SS_* */
91 void *so_pcb; /* protocol control block */
92 struct vnet *so_vnet; /* (a) network stack instance */
93 struct protosw *so_proto; /* (a) protocol handle */
94 short so_timeo; /* (g) connection timeout */
95 u_short so_error; /* (f) error affecting connection */
96 struct sigio *so_sigio; /* [sg] information for async I/O or
97 out of band data (SIGURG) */
98 struct ucred *so_cred; /* (a) user credentials */
99 struct label *so_label; /* (b) MAC label for socket */
100 /* NB: generation count must not be first. */
101 so_gen_t so_gencnt; /* (h) generation count */
102 void *so_emuldata; /* (b) private data for emulators */
103 so_dtor_t *so_dtor; /* (b) optional destructor */
104 struct osd osd; /* Object Specific extensions */
106 * so_fibnum, so_user_cookie and friends can be used to attach
107 * some user-specified metadata to a socket, which then can be
108 * used by the kernel for various actions.
109 * so_user_cookie is used by ipfw/dummynet.
111 int so_fibnum; /* routing domain for this socket */
112 uint32_t so_user_cookie;
114 int so_ts_clock; /* type of the clock used for timestamps */
115 uint32_t so_max_pacing_rate; /* (f) TX rate limit in bytes/s */
117 /* Regular (data flow) socket. */
119 /* (cr, cs) Receive and send buffers. */
120 struct sockbuf so_rcv, so_snd;
122 /* (e) Our place on accept queue. */
123 TAILQ_ENTRY(socket) so_list;
124 struct socket *so_listen; /* (b) */
127 SQ_INCOMP = 0x0800, /* on sol_incomp */
128 SQ_COMP = 0x1000, /* on sol_comp */
129 } so_qstate; /* (b) */
131 /* (b) cached MAC label for peer */
132 struct label *so_peerlabel;
133 u_long so_oobmark; /* chars to oob mark */
136 * Listening socket, where accepts occur, is so_listen in all
137 * subsidiary sockets. If so_listen is NULL, socket is not
138 * related to an accept. For a listening socket itself
139 * sol_incomp queues partially completed connections, while
140 * sol_comp is a queue of connections ready to be accepted.
141 * If a connection is aborted and it has so_listen set, then
142 * it has to be pulled out of either sol_incomp or sol_comp.
143 * We allow connections to queue up based on current queue
144 * lengths and limit on number of queued connections for this
148 /* (e) queue of partial unaccepted connections */
149 struct accept_queue sol_incomp;
150 /* (e) queue of complete unaccepted connections */
151 struct accept_queue sol_comp;
152 u_int sol_qlen; /* (e) sol_comp length */
153 u_int sol_incqlen; /* (e) sol_incomp length */
154 u_int sol_qlimit; /* (e) queue limit */
156 /* accept_filter(9) optional data */
157 struct accept_filter *sol_accept_filter;
158 void *sol_accept_filter_arg; /* saved filter args */
159 char *sol_accept_filter_str; /* saved user args */
161 /* Optional upcall, for kernel socket. */
162 so_upcall_t *sol_upcall; /* (e) */
163 void *sol_upcallarg; /* (e) */
165 /* Socket buffer parameters, to be copied to
166 * dataflow sockets, accepted from this one. */
169 u_int sol_sbrcv_hiwat;
170 u_int sol_sbsnd_hiwat;
171 short sol_sbrcv_flags;
172 short sol_sbsnd_flags;
173 sbintime_t sol_sbrcv_timeo;
174 sbintime_t sol_sbsnd_timeo;
178 #endif /* defined(_KERNEL) || defined(_WANT_SOCKET) */
183 * Historically, these bits were all kept in the so_state field.
184 * They are now split into separate, lock-specific fields.
185 * so_state maintains basic socket state protected by the socket lock.
186 * so_qstate holds information about the socket accept queues.
187 * Each socket buffer also has a state field holding information
188 * relevant to that socket buffer (can't send, rcv).
189 * Many fields will be read without locks to improve performance and avoid
190 * lock order issues. However, this approach must be used with caution.
192 #define SS_NOFDREF 0x0001 /* no file table ref any more */
193 #define SS_ISCONNECTED 0x0002 /* socket connected to a peer */
194 #define SS_ISCONNECTING 0x0004 /* in process of connecting to peer */
195 #define SS_ISDISCONNECTING 0x0008 /* in process of disconnecting */
196 #define SS_NBIO 0x0100 /* non-blocking ops */
197 #define SS_ASYNC 0x0200 /* async i/o notify */
198 #define SS_ISCONFIRMING 0x0400 /* deciding to accept connection req */
199 #define SS_ISDISCONNECTED 0x2000 /* socket disconnected from peer */
202 * Protocols can mark a socket as SS_PROTOREF to indicate that, following
203 * pru_detach, they still want the socket to persist, and will free it
204 * themselves when they are done. Protocols should only ever call sofree()
205 * following setting this flag in pru_detach(), and never otherwise, as
206 * sofree() bypasses socket reference counting.
208 #define SS_PROTOREF 0x4000 /* strong protocol reference */
212 #define SOCK_MTX(so) &(so)->so_lock
213 #define SOCK_LOCK(so) mtx_lock(&(so)->so_lock)
214 #define SOCK_OWNED(so) mtx_owned(&(so)->so_lock)
215 #define SOCK_UNLOCK(so) mtx_unlock(&(so)->so_lock)
216 #define SOCK_LOCK_ASSERT(so) mtx_assert(&(so)->so_lock, MA_OWNED)
217 #define SOCK_UNLOCK_ASSERT(so) mtx_assert(&(so)->so_lock, MA_NOTOWNED)
219 #define SOLISTENING(sol) (((sol)->so_options & SO_ACCEPTCONN) != 0)
220 #define SOLISTEN_LOCK(sol) do { \
221 mtx_lock(&(sol)->so_lock); \
222 KASSERT(SOLISTENING(sol), \
223 ("%s: %p not listening", __func__, (sol))); \
225 #define SOLISTEN_TRYLOCK(sol) mtx_trylock(&(sol)->so_lock)
226 #define SOLISTEN_UNLOCK(sol) do { \
227 KASSERT(SOLISTENING(sol), \
228 ("%s: %p not listening", __func__, (sol))); \
229 mtx_unlock(&(sol)->so_lock); \
231 #define SOLISTEN_LOCK_ASSERT(sol) do { \
232 mtx_assert(&(sol)->so_lock, MA_OWNED); \
233 KASSERT(SOLISTENING(sol), \
234 ("%s: %p not listening", __func__, (sol))); \
238 * Macros for sockets and socket buffering.
244 #define SBL_WAIT 0x00000001 /* Wait if not immediately available. */
245 #define SBL_NOINTR 0x00000002 /* Force non-interruptible sleep. */
246 #define SBL_VALID (SBL_WAIT | SBL_NOINTR)
249 * Do we need to notify the other side when I/O is possible?
251 #define sb_notify(sb) (((sb)->sb_flags & (SB_WAIT | SB_SEL | SB_ASYNC | \
252 SB_UPCALL | SB_AIO | SB_KNOTE)) != 0)
254 /* do we have to send all at once on a socket? */
255 #define sosendallatonce(so) \
256 ((so)->so_proto->pr_flags & PR_ATOMIC)
258 /* can we read something from so? */
259 #define soreadabledata(so) \
260 (sbavail(&(so)->so_rcv) >= (so)->so_rcv.sb_lowat || (so)->so_error)
261 #define soreadable(so) \
262 (soreadabledata(so) || ((so)->so_rcv.sb_state & SBS_CANTRCVMORE))
264 /* can we write something to so? */
265 #define sowriteable(so) \
266 ((sbspace(&(so)->so_snd) >= (so)->so_snd.sb_lowat && \
267 (((so)->so_state&SS_ISCONNECTED) || \
268 ((so)->so_proto->pr_flags&PR_CONNREQUIRED)==0)) || \
269 ((so)->so_snd.sb_state & SBS_CANTSENDMORE) || \
273 * soref()/sorele() ref-count the socket structure.
274 * soref() may be called without owning socket lock, but in that case a
275 * caller must own something that holds socket, and so_count must be not 0.
276 * Note that you must still explicitly close the socket, but the last ref
277 * count will free the structure.
279 #define soref(so) refcount_acquire(&(so)->so_count)
280 #define sorele(so) do { \
281 SOCK_LOCK_ASSERT(so); \
282 if (refcount_release(&(so)->so_count)) \
289 * In sorwakeup() and sowwakeup(), acquire the socket buffer lock to
290 * avoid a non-atomic test-and-wakeup. However, sowakeup is
291 * responsible for releasing the lock if it is called. We unlock only
292 * if we don't call into sowakeup. If any code is introduced that
293 * directly invokes the underlying sowakeup() primitives, it must
294 * maintain the same semantics.
296 #define sorwakeup_locked(so) do { \
297 SOCKBUF_LOCK_ASSERT(&(so)->so_rcv); \
298 if (sb_notify(&(so)->so_rcv)) \
299 sowakeup((so), &(so)->so_rcv); \
301 SOCKBUF_UNLOCK(&(so)->so_rcv); \
304 #define sorwakeup(so) do { \
305 SOCKBUF_LOCK(&(so)->so_rcv); \
306 sorwakeup_locked(so); \
309 #define sowwakeup_locked(so) do { \
310 SOCKBUF_LOCK_ASSERT(&(so)->so_snd); \
311 if (sb_notify(&(so)->so_snd)) \
312 sowakeup((so), &(so)->so_snd); \
314 SOCKBUF_UNLOCK(&(so)->so_snd); \
317 #define sowwakeup(so) do { \
318 SOCKBUF_LOCK(&(so)->so_snd); \
319 sowwakeup_locked(so); \
322 struct accept_filter {
325 (struct socket *so, void *arg, int waitflag);
326 void * (*accf_create)
327 (struct socket *so, char *arg);
330 SLIST_ENTRY(accept_filter) accf_next;
333 #ifdef MALLOC_DECLARE
334 MALLOC_DECLARE(M_ACCF);
335 MALLOC_DECLARE(M_PCB);
336 MALLOC_DECLARE(M_SONAME);
340 * Socket specific helper hook point identifiers
341 * Do not leave holes in the sequence, hook registration is a loop.
343 #define HHOOK_SOCKET_OPT 0
344 #define HHOOK_SOCKET_CREATE 1
345 #define HHOOK_SOCKET_RCV 2
346 #define HHOOK_SOCKET_SND 3
347 #define HHOOK_FILT_SOREAD 4
348 #define HHOOK_FILT_SOWRITE 5
349 #define HHOOK_SOCKET_CLOSE 6
350 #define HHOOK_SOCKET_LAST HHOOK_SOCKET_CLOSE
352 struct socket_hhook_data {
355 void *hctx; /* hook point specific data*/
359 extern int maxsockets;
360 extern u_long sb_max;
361 extern so_gen_t so_gencnt;
371 /* 'which' values for socket upcalls. */
375 /* Return values for socket upcalls. */
377 #define SU_ISCONNECTED 1
380 * From uipc_socket and friends
382 int getsockaddr(struct sockaddr **namp, const struct sockaddr *uaddr,
384 int getsock_cap(struct thread *td, int fd, cap_rights_t *rightsp,
385 struct file **fpp, u_int *fflagp, struct filecaps *havecaps);
386 void soabort(struct socket *so);
387 int soaccept(struct socket *so, struct sockaddr **nam);
388 void soaio_enqueue(struct task *task);
389 void soaio_rcv(void *context, int pending);
390 void soaio_snd(void *context, int pending);
391 int socheckuid(struct socket *so, uid_t uid);
392 int sobind(struct socket *so, struct sockaddr *nam, struct thread *td);
393 int sobindat(int fd, struct socket *so, struct sockaddr *nam,
395 int soclose(struct socket *so);
396 int soconnect(struct socket *so, struct sockaddr *nam, struct thread *td);
397 int soconnectat(int fd, struct socket *so, struct sockaddr *nam,
399 int soconnect2(struct socket *so1, struct socket *so2);
400 int socreate(int dom, struct socket **aso, int type, int proto,
401 struct ucred *cred, struct thread *td);
402 int sodisconnect(struct socket *so);
403 void sodtor_set(struct socket *, so_dtor_t *);
404 struct sockaddr *sodupsockaddr(const struct sockaddr *sa, int mflags);
405 void sofree(struct socket *so);
406 void sohasoutofband(struct socket *so);
407 int solisten(struct socket *so, int backlog, struct thread *td);
408 void solisten_proto(struct socket *so, int backlog);
409 int solisten_proto_check(struct socket *so);
410 int solisten_dequeue(struct socket *, struct socket **, int);
412 sonewconn(struct socket *head, int connstatus);
414 sopeeloff(struct socket *);
415 int sopoll(struct socket *so, int events, struct ucred *active_cred,
417 int sopoll_generic(struct socket *so, int events,
418 struct ucred *active_cred, struct thread *td);
419 int soreceive(struct socket *so, struct sockaddr **paddr, struct uio *uio,
420 struct mbuf **mp0, struct mbuf **controlp, int *flagsp);
421 int soreceive_stream(struct socket *so, struct sockaddr **paddr,
422 struct uio *uio, struct mbuf **mp0, struct mbuf **controlp,
424 int soreceive_dgram(struct socket *so, struct sockaddr **paddr,
425 struct uio *uio, struct mbuf **mp0, struct mbuf **controlp,
427 int soreceive_generic(struct socket *so, struct sockaddr **paddr,
428 struct uio *uio, struct mbuf **mp0, struct mbuf **controlp,
430 int soreserve(struct socket *so, u_long sndcc, u_long rcvcc);
431 void sorflush(struct socket *so);
432 int sosend(struct socket *so, struct sockaddr *addr, struct uio *uio,
433 struct mbuf *top, struct mbuf *control, int flags,
435 int sosend_dgram(struct socket *so, struct sockaddr *addr,
436 struct uio *uio, struct mbuf *top, struct mbuf *control,
437 int flags, struct thread *td);
438 int sosend_generic(struct socket *so, struct sockaddr *addr,
439 struct uio *uio, struct mbuf *top, struct mbuf *control,
440 int flags, struct thread *td);
441 int soshutdown(struct socket *so, int how);
442 void soupcall_clear(struct socket *, int);
443 void soupcall_set(struct socket *, int, so_upcall_t, void *);
444 void solisten_upcall_set(struct socket *, so_upcall_t, void *);
445 void sowakeup(struct socket *so, struct sockbuf *sb);
446 void sowakeup_aio(struct socket *so, struct sockbuf *sb);
447 void solisten_wakeup(struct socket *);
448 int selsocket(struct socket *so, int events, struct timeval *tv,
450 void soisconnected(struct socket *so);
451 void soisconnecting(struct socket *so);
452 void soisdisconnected(struct socket *so);
453 void soisdisconnecting(struct socket *so);
454 void socantrcvmore(struct socket *so);
455 void socantrcvmore_locked(struct socket *so);
456 void socantsendmore(struct socket *so);
457 void socantsendmore_locked(struct socket *so);
460 * Accept filter functions (duh).
462 int accept_filt_add(struct accept_filter *filt);
463 int accept_filt_del(char *name);
464 struct accept_filter *accept_filt_get(char *name);
465 #ifdef ACCEPT_FILTER_MOD
467 SYSCTL_DECL(_net_inet_accf);
469 int accept_filt_generic_mod_event(module_t mod, int event, void *data);
475 * Structure to export socket from kernel to utilities, via sysctl(3).
478 ksize_t xso_len; /* length of this structure */
479 kvaddr_t xso_so; /* kernel address of struct socket */
480 kvaddr_t so_pcb; /* kernel address of struct inpcb */
482 int64_t so_spare64[8];
483 int32_t xso_protocol;
490 int32_t so_spare32[8];
511 void sotoxsocket(struct socket *so, struct xsocket *xso);
512 void sbtoxsockbuf(struct sockbuf *sb, struct xsockbuf *xsb);
516 * Socket buffer state bits. Exported via libprocstat(3).
518 #define SBS_CANTSENDMORE 0x0010 /* can't send more data to peer */
519 #define SBS_CANTRCVMORE 0x0020 /* can't receive more data from peer */
520 #define SBS_RCVATMARK 0x0040 /* at mark on input */
522 #endif /* !_SYS_SOCKETVAR_H_ */