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29 * @(#)socketvar.h 8.3 (Berkeley) 2/19/95
33 #ifndef _SYS_SOCKBUF_H_
34 #define _SYS_SOCKBUF_H_
35 #include <sys/selinfo.h> /* for struct selinfo */
36 #include <sys/_lock.h>
37 #include <sys/_mutex.h>
40 #define SB_MAX (2*1024*1024) /* default for max chars in sockbuf */
43 * Constants for sb_flags field of struct sockbuf.
45 #define SB_WAIT 0x04 /* someone is waiting for data/space */
46 #define SB_SEL 0x08 /* someone is selecting */
47 #define SB_ASYNC 0x10 /* ASYNC I/O, need signals */
48 #define SB_UPCALL 0x20 /* someone wants an upcall */
49 #define SB_NOINTR 0x40 /* operations not interruptible */
50 #define SB_AIO 0x80 /* AIO operations queued */
51 #define SB_KNOTE 0x100 /* kernel note attached */
52 #define SB_NOCOALESCE 0x200 /* don't coalesce new data into existing mbufs */
53 #define SB_IN_TOE 0x400 /* socket buffer is in the middle of an operation */
54 #define SB_AUTOSIZE 0x800 /* automatically size socket buffer */
55 #define SB_STOP 0x1000 /* backpressure indicator */
57 #define SBS_CANTSENDMORE 0x0010 /* can't send more data to peer */
58 #define SBS_CANTRCVMORE 0x0020 /* can't receive more data from peer */
59 #define SBS_RCVATMARK 0x0040 /* at mark on input */
79 * Variables for socket buffering.
82 struct selinfo sb_sel; /* process selecting read/write */
83 struct mtx sb_mtx; /* sockbuf lock */
84 struct sx sb_sx; /* prevent I/O interlacing */
85 short sb_state; /* (c/d) socket state on sockbuf */
86 #define sb_startzero sb_mb
87 struct mbuf *sb_mb; /* (c/d) the mbuf chain */
88 struct mbuf *sb_mbtail; /* (c/d) the last mbuf in the chain */
89 struct mbuf *sb_lastrecord; /* (c/d) first mbuf of last
90 * record in socket buffer */
91 struct mbuf *sb_sndptr; /* (c/d) pointer into mbuf chain */
92 u_int sb_sndptroff; /* (c/d) byte offset of ptr into chain */
93 u_int sb_cc; /* (c/d) actual chars in buffer */
94 u_int sb_hiwat; /* (c/d) max actual char count */
95 u_int sb_mbcnt; /* (c/d) chars of mbufs used */
96 u_int sb_mcnt; /* (c/d) number of mbufs in buffer */
97 u_int sb_ccnt; /* (c/d) number of clusters in buffer */
98 u_int sb_mbmax; /* (c/d) max chars of mbufs to use */
99 u_int sb_ctl; /* (c/d) non-data chars in buffer */
100 int sb_lowat; /* (c/d) low water mark */
101 sbintime_t sb_timeo; /* (c/d) timeout for read/write */
102 short sb_flags; /* (c/d) flags, see below */
103 int (*sb_upcall)(struct socket *, void *, int); /* (c/d) */
104 void *sb_upcallarg; /* (c/d) */
110 * Per-socket buffer mutex used to protect most fields in the socket
113 #define SOCKBUF_MTX(_sb) (&(_sb)->sb_mtx)
114 #define SOCKBUF_LOCK_INIT(_sb, _name) \
115 mtx_init(SOCKBUF_MTX(_sb), _name, NULL, MTX_DEF)
116 #define SOCKBUF_LOCK_DESTROY(_sb) mtx_destroy(SOCKBUF_MTX(_sb))
117 #define SOCKBUF_LOCK(_sb) mtx_lock(SOCKBUF_MTX(_sb))
118 #define SOCKBUF_OWNED(_sb) mtx_owned(SOCKBUF_MTX(_sb))
119 #define SOCKBUF_UNLOCK(_sb) mtx_unlock(SOCKBUF_MTX(_sb))
120 #define SOCKBUF_LOCK_ASSERT(_sb) mtx_assert(SOCKBUF_MTX(_sb), MA_OWNED)
121 #define SOCKBUF_UNLOCK_ASSERT(_sb) mtx_assert(SOCKBUF_MTX(_sb), MA_NOTOWNED)
123 void sbappend(struct sockbuf *sb, struct mbuf *m);
124 void sbappend_locked(struct sockbuf *sb, struct mbuf *m);
125 void sbappendstream(struct sockbuf *sb, struct mbuf *m);
126 void sbappendstream_locked(struct sockbuf *sb, struct mbuf *m);
127 int sbappendaddr(struct sockbuf *sb, const struct sockaddr *asa,
128 struct mbuf *m0, struct mbuf *control);
129 int sbappendaddr_locked(struct sockbuf *sb, const struct sockaddr *asa,
130 struct mbuf *m0, struct mbuf *control);
131 int sbappendaddr_nospacecheck_locked(struct sockbuf *sb,
132 const struct sockaddr *asa, struct mbuf *m0, struct mbuf *control);
133 int sbappendcontrol(struct sockbuf *sb, struct mbuf *m0,
134 struct mbuf *control);
135 int sbappendcontrol_locked(struct sockbuf *sb, struct mbuf *m0,
136 struct mbuf *control);
137 void sbappendrecord(struct sockbuf *sb, struct mbuf *m0);
138 void sbappendrecord_locked(struct sockbuf *sb, struct mbuf *m0);
139 void sbcheck(struct sockbuf *sb);
140 void sbcompress(struct sockbuf *sb, struct mbuf *m, struct mbuf *n);
142 sbcreatecontrol(caddr_t p, int size, int type, int level);
143 void sbdestroy(struct sockbuf *sb, struct socket *so);
144 void sbdrop(struct sockbuf *sb, int len);
145 void sbdrop_locked(struct sockbuf *sb, int len);
147 sbcut_locked(struct sockbuf *sb, int len);
148 void sbdroprecord(struct sockbuf *sb);
149 void sbdroprecord_locked(struct sockbuf *sb);
150 void sbflush(struct sockbuf *sb);
151 void sbflush_locked(struct sockbuf *sb);
152 void sbrelease(struct sockbuf *sb, struct socket *so);
153 void sbrelease_internal(struct sockbuf *sb, struct socket *so);
154 void sbrelease_locked(struct sockbuf *sb, struct socket *so);
155 int sbreserve(struct sockbuf *sb, u_long cc, struct socket *so,
157 int sbreserve_locked(struct sockbuf *sb, u_long cc, struct socket *so,
160 sbsndptr(struct sockbuf *sb, u_int off, u_int len, u_int *moff);
161 void sbtoxsockbuf(struct sockbuf *sb, struct xsockbuf *xsb);
162 int sbwait(struct sockbuf *sb);
163 int sblock(struct sockbuf *sb, int flags);
164 void sbunlock(struct sockbuf *sb);
167 * How much space is there in a socket buffer (so->so_snd or so->so_rcv)?
168 * This is problematical if the fields are unsigned, as the space might
169 * still be negative (cc > hiwat or mbcnt > mbmax). Should detect
170 * overflow and return 0. Should use "lmin" but it doesn't exist now.
174 sbspace(struct sockbuf *sb)
179 if (sb->sb_flags & SB_STOP)
181 bleft = sb->sb_hiwat - sb->sb_cc;
182 mleft = sb->sb_mbmax - sb->sb_mbcnt;
183 return((bleft < mleft) ? bleft : mleft);
186 /* adjust counters in sb reflecting allocation of m */
187 #define sballoc(sb, m) { \
188 (sb)->sb_cc += (m)->m_len; \
189 if ((m)->m_type != MT_DATA && (m)->m_type != MT_OOBDATA) \
190 (sb)->sb_ctl += (m)->m_len; \
191 (sb)->sb_mbcnt += MSIZE; \
192 (sb)->sb_mcnt += 1; \
193 if ((m)->m_flags & M_EXT) { \
194 (sb)->sb_mbcnt += (m)->m_ext.ext_size; \
195 (sb)->sb_ccnt += 1; \
199 /* adjust counters in sb reflecting freeing of m */
200 #define sbfree(sb, m) { \
201 (sb)->sb_cc -= (m)->m_len; \
202 if ((m)->m_type != MT_DATA && (m)->m_type != MT_OOBDATA) \
203 (sb)->sb_ctl -= (m)->m_len; \
204 (sb)->sb_mbcnt -= MSIZE; \
205 (sb)->sb_mcnt -= 1; \
206 if ((m)->m_flags & M_EXT) { \
207 (sb)->sb_mbcnt -= (m)->m_ext.ext_size; \
208 (sb)->sb_ccnt -= 1; \
210 if ((sb)->sb_sndptr == (m)) { \
211 (sb)->sb_sndptr = NULL; \
212 (sb)->sb_sndptroff = 0; \
214 if ((sb)->sb_sndptroff != 0) \
215 (sb)->sb_sndptroff -= (m)->m_len; \
218 #define SB_EMPTY_FIXUP(sb) do { \
219 if ((sb)->sb_mb == NULL) { \
220 (sb)->sb_mbtail = NULL; \
221 (sb)->sb_lastrecord = NULL; \
223 } while (/*CONSTCOND*/0)
226 void sblastrecordchk(struct sockbuf *, const char *, int);
227 #define SBLASTRECORDCHK(sb) sblastrecordchk((sb), __FILE__, __LINE__)
229 void sblastmbufchk(struct sockbuf *, const char *, int);
230 #define SBLASTMBUFCHK(sb) sblastmbufchk((sb), __FILE__, __LINE__)
232 #define SBLASTRECORDCHK(sb) /* nothing */
233 #define SBLASTMBUFCHK(sb) /* nothing */
234 #endif /* SOCKBUF_DEBUG */
238 #endif /* _SYS_SOCKBUF_H_ */