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31 * @(#)socketvar.h 8.3 (Berkeley) 2/19/95
35 #ifndef _SYS_SOCKBUF_H_
36 #define _SYS_SOCKBUF_H_
39 * Constants for sb_flags field of struct sockbuf/xsockbuf.
41 #define SB_WAIT 0x04 /* someone is waiting for data/space */
42 #define SB_SEL 0x08 /* someone is selecting */
43 #define SB_ASYNC 0x10 /* ASYNC I/O, need signals */
44 #define SB_UPCALL 0x20 /* someone wants an upcall */
45 #define SB_NOINTR 0x40 /* operations not interruptible */
46 #define SB_AIO 0x80 /* AIO operations queued */
47 #define SB_KNOTE 0x100 /* kernel note attached */
48 #define SB_NOCOALESCE 0x200 /* don't coalesce new data into existing mbufs */
49 #define SB_IN_TOE 0x400 /* socket buffer is in the middle of an operation */
50 #define SB_AUTOSIZE 0x800 /* automatically size socket buffer */
51 #define SB_STOP 0x1000 /* backpressure indicator */
52 #define SB_AIO_RUNNING 0x2000 /* AIO operation running */
54 #define SBS_CANTSENDMORE 0x0010 /* can't send more data to peer */
55 #define SBS_CANTRCVMORE 0x0020 /* can't receive more data from peer */
56 #define SBS_RCVATMARK 0x0040 /* at mark on input */
58 #if defined(_KERNEL) || defined(_WANT_SOCKET)
59 #include <sys/_lock.h>
60 #include <sys/_mutex.h>
62 #include <sys/_task.h>
64 #define SB_MAX (2*1024*1024) /* default for max chars in sockbuf */
73 * Variables for socket buffering.
75 * Locking key to struct sockbuf:
76 * (a) locked by SOCKBUF_LOCK().
79 struct mtx sb_mtx; /* sockbuf lock */
80 struct sx sb_sx; /* prevent I/O interlacing */
81 struct selinfo *sb_sel; /* process selecting read/write */
82 short sb_state; /* (a) socket state on sockbuf */
83 #define sb_startzero sb_mb
84 struct mbuf *sb_mb; /* (a) the mbuf chain */
85 struct mbuf *sb_mbtail; /* (a) the last mbuf in the chain */
86 struct mbuf *sb_lastrecord; /* (a) first mbuf of last
87 * record in socket buffer */
88 struct mbuf *sb_sndptr; /* (a) pointer into mbuf chain */
89 struct mbuf *sb_fnrdy; /* (a) pointer to first not ready buffer */
90 u_int sb_sndptroff; /* (a) byte offset of ptr into chain */
91 u_int sb_acc; /* (a) available chars in buffer */
92 u_int sb_ccc; /* (a) claimed chars in buffer */
93 u_int sb_hiwat; /* (a) max actual char count */
94 u_int sb_mbcnt; /* (a) chars of mbufs used */
95 u_int sb_mcnt; /* (a) number of mbufs in buffer */
96 u_int sb_ccnt; /* (a) number of clusters in buffer */
97 u_int sb_mbmax; /* (a) max chars of mbufs to use */
98 u_int sb_ctl; /* (a) non-data chars in buffer */
99 int sb_lowat; /* (a) low water mark */
100 sbintime_t sb_timeo; /* (a) timeout for read/write */
101 short sb_flags; /* (a) flags, see below */
102 int (*sb_upcall)(struct socket *, void *, int); /* (a) */
103 void *sb_upcallarg; /* (a) */
104 TAILQ_HEAD(, kaiocb) sb_aiojobq; /* (a) pending AIO ops */
105 struct task sb_aiotask; /* AIO task */
108 #endif /* defined(_KERNEL) || defined(_WANT_SOCKET) */
112 * Per-socket buffer mutex used to protect most fields in the socket
115 #define SOCKBUF_MTX(_sb) (&(_sb)->sb_mtx)
116 #define SOCKBUF_LOCK_INIT(_sb, _name) \
117 mtx_init(SOCKBUF_MTX(_sb), _name, NULL, MTX_DEF)
118 #define SOCKBUF_LOCK_DESTROY(_sb) mtx_destroy(SOCKBUF_MTX(_sb))
119 #define SOCKBUF_LOCK(_sb) mtx_lock(SOCKBUF_MTX(_sb))
120 #define SOCKBUF_OWNED(_sb) mtx_owned(SOCKBUF_MTX(_sb))
121 #define SOCKBUF_UNLOCK(_sb) mtx_unlock(SOCKBUF_MTX(_sb))
122 #define SOCKBUF_LOCK_ASSERT(_sb) mtx_assert(SOCKBUF_MTX(_sb), MA_OWNED)
123 #define SOCKBUF_UNLOCK_ASSERT(_sb) mtx_assert(SOCKBUF_MTX(_sb), MA_NOTOWNED)
126 * Socket buffer private mbuf(9) flags.
128 #define M_NOTREADY M_PROTO1 /* m_data not populated yet */
129 #define M_BLOCKED M_PROTO2 /* M_NOTREADY in front of m */
130 #define M_NOTAVAIL (M_NOTREADY | M_BLOCKED)
132 void sbappend(struct sockbuf *sb, struct mbuf *m, int flags);
133 void sbappend_locked(struct sockbuf *sb, struct mbuf *m, int flags);
134 void sbappendstream(struct sockbuf *sb, struct mbuf *m, int flags);
135 void sbappendstream_locked(struct sockbuf *sb, struct mbuf *m, int flags);
136 int sbappendaddr(struct sockbuf *sb, const struct sockaddr *asa,
137 struct mbuf *m0, struct mbuf *control);
138 int sbappendaddr_locked(struct sockbuf *sb, const struct sockaddr *asa,
139 struct mbuf *m0, struct mbuf *control);
140 int sbappendaddr_nospacecheck_locked(struct sockbuf *sb,
141 const struct sockaddr *asa, struct mbuf *m0, struct mbuf *control);
142 void sbappendcontrol(struct sockbuf *sb, struct mbuf *m0,
143 struct mbuf *control, int flags);
144 void sbappendcontrol_locked(struct sockbuf *sb, struct mbuf *m0,
145 struct mbuf *control, int flags);
146 void sbappendrecord(struct sockbuf *sb, struct mbuf *m0);
147 void sbappendrecord_locked(struct sockbuf *sb, struct mbuf *m0);
148 void sbcompress(struct sockbuf *sb, struct mbuf *m, struct mbuf *n);
150 sbcreatecontrol(caddr_t p, int size, int type, int level);
151 void sbdestroy(struct sockbuf *sb, struct socket *so);
152 void sbdrop(struct sockbuf *sb, int len);
153 void sbdrop_locked(struct sockbuf *sb, int len);
155 sbcut_locked(struct sockbuf *sb, int len);
156 void sbdroprecord(struct sockbuf *sb);
157 void sbdroprecord_locked(struct sockbuf *sb);
158 void sbflush(struct sockbuf *sb);
159 void sbflush_locked(struct sockbuf *sb);
160 void sbrelease(struct sockbuf *sb, struct socket *so);
161 void sbrelease_internal(struct sockbuf *sb, struct socket *so);
162 void sbrelease_locked(struct sockbuf *sb, struct socket *so);
163 int sbsetopt(struct socket *so, int cmd, u_long cc);
164 int sbreserve_locked(struct sockbuf *sb, u_long cc, struct socket *so,
167 sbsndptr(struct sockbuf *sb, u_int off, u_int len, u_int *moff);
169 sbsndptr_noadv(struct sockbuf *sb, u_int off, u_int *moff);
171 sbsndptr_adv(struct sockbuf *sb, struct mbuf *mb, u_int len);
173 sbsndmbuf(struct sockbuf *sb, u_int off, u_int *moff);
174 int sbwait(struct sockbuf *sb);
175 int sblock(struct sockbuf *sb, int flags);
176 void sbunlock(struct sockbuf *sb);
177 void sballoc(struct sockbuf *, struct mbuf *);
178 void sbfree(struct sockbuf *, struct mbuf *);
179 int sbready(struct sockbuf *, struct mbuf *, int);
182 * Return how much data is available to be taken out of socket
186 sbavail(struct sockbuf *sb)
190 SOCKBUF_LOCK_ASSERT(sb);
196 * Return how much data sits there in the socket buffer
197 * It might be that some data is not yet ready to be read.
200 sbused(struct sockbuf *sb)
204 SOCKBUF_LOCK_ASSERT(sb);
210 * How much space is there in a socket buffer (so->so_snd or so->so_rcv)?
211 * This is problematical if the fields are unsigned, as the space might
212 * still be negative (ccc > hiwat or mbcnt > mbmax).
215 sbspace(struct sockbuf *sb)
217 int bleft, mleft; /* size should match sockbuf fields */
220 SOCKBUF_LOCK_ASSERT(sb);
223 if (sb->sb_flags & SB_STOP)
226 bleft = sb->sb_hiwat - sb->sb_ccc;
227 mleft = sb->sb_mbmax - sb->sb_mbcnt;
229 return ((bleft < mleft) ? bleft : mleft);
232 #define SB_EMPTY_FIXUP(sb) do { \
233 if ((sb)->sb_mb == NULL) { \
234 (sb)->sb_mbtail = NULL; \
235 (sb)->sb_lastrecord = NULL; \
237 } while (/*CONSTCOND*/0)
240 void sblastrecordchk(struct sockbuf *, const char *, int);
241 void sblastmbufchk(struct sockbuf *, const char *, int);
242 void sbcheck(struct sockbuf *, const char *, int);
243 #define SBLASTRECORDCHK(sb) sblastrecordchk((sb), __FILE__, __LINE__)
244 #define SBLASTMBUFCHK(sb) sblastmbufchk((sb), __FILE__, __LINE__)
245 #define SBCHECK(sb) sbcheck((sb), __FILE__, __LINE__)
247 #define SBLASTRECORDCHK(sb) do {} while (0)
248 #define SBLASTMBUFCHK(sb) do {} while (0)
249 #define SBCHECK(sb) do {} while (0)
250 #endif /* SOCKBUF_DEBUG */
254 #endif /* _SYS_SOCKBUF_H_ */