sockbuf.h revision 225169
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 * 4. 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: head/sys/sys/sockbuf.h 225169 2011-08-25 09:20:13Z bz $
32 */
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>
38#include <sys/_sx.h>
39
40#define	SB_MAX		(2*1024*1024)	/* default for max chars in sockbuf */
41
42/*
43 * Constants for sb_flags field of struct sockbuf.
44 */
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
56#define	SBS_CANTSENDMORE	0x0010	/* can't send more data to peer */
57#define	SBS_CANTRCVMORE		0x0020	/* can't receive more data from peer */
58#define	SBS_RCVATMARK		0x0040	/* at mark on input */
59
60struct mbuf;
61struct sockaddr;
62struct socket;
63struct thread;
64
65struct	xsockbuf {
66	u_int	sb_cc;
67	u_int	sb_hiwat;
68	u_int	sb_mbcnt;
69	u_int   sb_mcnt;
70	u_int   sb_ccnt;
71	u_int	sb_mbmax;
72	int	sb_lowat;
73	int	sb_timeo;
74	short	sb_flags;
75};
76
77/*
78 * Variables for socket buffering.
79 */
80struct	sockbuf {
81	struct	selinfo sb_sel;	/* process selecting read/write */
82	struct	mtx sb_mtx;	/* sockbuf lock */
83	struct	sx sb_sx;	/* prevent I/O interlacing */
84	short	sb_state;	/* (c/d) socket state on sockbuf */
85#define	sb_startzero	sb_mb
86	struct	mbuf *sb_mb;	/* (c/d) the mbuf chain */
87	struct	mbuf *sb_mbtail; /* (c/d) the last mbuf in the chain */
88	struct	mbuf *sb_lastrecord;	/* (c/d) first mbuf of last
89					 * record in socket buffer */
90	struct	mbuf *sb_sndptr; /* (c/d) pointer into mbuf chain */
91	u_int	sb_sndptroff;	/* (c/d) byte offset of ptr into chain */
92	u_int	sb_cc;		/* (c/d) actual chars in buffer */
93	u_int	sb_hiwat;	/* (c/d) max actual char count */
94	u_int	sb_mbcnt;	/* (c/d) chars of mbufs used */
95	u_int   sb_mcnt;        /* (c/d) number of mbufs in buffer */
96	u_int   sb_ccnt;        /* (c/d) number of clusters in buffer */
97	u_int	sb_mbmax;	/* (c/d) max chars of mbufs to use */
98	u_int	sb_ctl;		/* (c/d) non-data chars in buffer */
99	int	sb_lowat;	/* (c/d) low water mark */
100	int	sb_timeo;	/* (c/d) timeout for read/write */
101	short	sb_flags;	/* (c/d) flags, see below */
102	int	(*sb_upcall)(struct socket *, void *, int); /* (c/d) */
103	void	*sb_upcallarg;	/* (c/d) */
104};
105
106#ifdef _KERNEL
107
108/*
109 * Per-socket buffer mutex used to protect most fields in the socket
110 * buffer.
111 */
112#define	SOCKBUF_MTX(_sb)		(&(_sb)->sb_mtx)
113#define	SOCKBUF_LOCK_INIT(_sb, _name) \
114	mtx_init(SOCKBUF_MTX(_sb), _name, NULL, MTX_DEF)
115#define	SOCKBUF_LOCK_DESTROY(_sb)	mtx_destroy(SOCKBUF_MTX(_sb))
116#define	SOCKBUF_LOCK(_sb)		mtx_lock(SOCKBUF_MTX(_sb))
117#define	SOCKBUF_OWNED(_sb)		mtx_owned(SOCKBUF_MTX(_sb))
118#define	SOCKBUF_UNLOCK(_sb)		mtx_unlock(SOCKBUF_MTX(_sb))
119#define	SOCKBUF_LOCK_ASSERT(_sb)	mtx_assert(SOCKBUF_MTX(_sb), MA_OWNED)
120#define	SOCKBUF_UNLOCK_ASSERT(_sb)	mtx_assert(SOCKBUF_MTX(_sb), MA_NOTOWNED)
121
122void	sbappend(struct sockbuf *sb, struct mbuf *m);
123void	sbappend_locked(struct sockbuf *sb, struct mbuf *m);
124void	sbappendstream(struct sockbuf *sb, struct mbuf *m);
125void	sbappendstream_locked(struct sockbuf *sb, struct mbuf *m);
126int	sbappendaddr(struct sockbuf *sb, const struct sockaddr *asa,
127	    struct mbuf *m0, struct mbuf *control);
128int	sbappendaddr_locked(struct sockbuf *sb, const struct sockaddr *asa,
129	    struct mbuf *m0, struct mbuf *control);
130int	sbappendcontrol(struct sockbuf *sb, struct mbuf *m0,
131	    struct mbuf *control);
132int	sbappendcontrol_locked(struct sockbuf *sb, struct mbuf *m0,
133	    struct mbuf *control);
134void	sbappendrecord(struct sockbuf *sb, struct mbuf *m0);
135void	sbappendrecord_locked(struct sockbuf *sb, struct mbuf *m0);
136void	sbcheck(struct sockbuf *sb);
137void	sbcompress(struct sockbuf *sb, struct mbuf *m, struct mbuf *n);
138struct mbuf *
139	sbcreatecontrol(caddr_t p, int size, int type, int level);
140void	sbdestroy(struct sockbuf *sb, struct socket *so);
141void	sbdrop(struct sockbuf *sb, int len);
142void	sbdrop_locked(struct sockbuf *sb, int len);
143void	sbdroprecord(struct sockbuf *sb);
144void	sbdroprecord_locked(struct sockbuf *sb);
145void	sbflush(struct sockbuf *sb);
146void	sbflush_locked(struct sockbuf *sb);
147void	sbrelease(struct sockbuf *sb, struct socket *so);
148void	sbrelease_internal(struct sockbuf *sb, struct socket *so);
149void	sbrelease_locked(struct sockbuf *sb, struct socket *so);
150int	sbreserve(struct sockbuf *sb, u_long cc, struct socket *so,
151	    struct thread *td);
152int	sbreserve_locked(struct sockbuf *sb, u_long cc, struct socket *so,
153	    struct thread *td);
154struct mbuf *
155	sbsndptr(struct sockbuf *sb, u_int off, u_int len, u_int *moff);
156void	sbtoxsockbuf(struct sockbuf *sb, struct xsockbuf *xsb);
157int	sbwait(struct sockbuf *sb);
158int	sblock(struct sockbuf *sb, int flags);
159void	sbunlock(struct sockbuf *sb);
160
161/*
162 * How much space is there in a socket buffer (so->so_snd or so->so_rcv)?
163 * This is problematical if the fields are unsigned, as the space might
164 * still be negative (cc > hiwat or mbcnt > mbmax).  Should detect
165 * overflow and return 0.  Should use "lmin" but it doesn't exist now.
166 */
167#define	sbspace(sb) \
168    ((long) imin((int)((sb)->sb_hiwat - (sb)->sb_cc), \
169	 (int)((sb)->sb_mbmax - (sb)->sb_mbcnt)))
170
171/* adjust counters in sb reflecting allocation of m */
172#define	sballoc(sb, m) { \
173	(sb)->sb_cc += (m)->m_len; \
174	if ((m)->m_type != MT_DATA && (m)->m_type != MT_OOBDATA) \
175		(sb)->sb_ctl += (m)->m_len; \
176	(sb)->sb_mbcnt += MSIZE; \
177	(sb)->sb_mcnt += 1; \
178	if ((m)->m_flags & M_EXT) { \
179		(sb)->sb_mbcnt += (m)->m_ext.ext_size; \
180		(sb)->sb_ccnt += 1; \
181	} \
182}
183
184/* adjust counters in sb reflecting freeing of m */
185#define	sbfree(sb, m) { \
186	(sb)->sb_cc -= (m)->m_len; \
187	if ((m)->m_type != MT_DATA && (m)->m_type != MT_OOBDATA) \
188		(sb)->sb_ctl -= (m)->m_len; \
189	(sb)->sb_mbcnt -= MSIZE; \
190	(sb)->sb_mcnt -= 1; \
191	if ((m)->m_flags & M_EXT) { \
192		(sb)->sb_mbcnt -= (m)->m_ext.ext_size; \
193		(sb)->sb_ccnt -= 1; \
194	} \
195	if ((sb)->sb_sndptr == (m)) { \
196		(sb)->sb_sndptr = NULL; \
197		(sb)->sb_sndptroff = 0; \
198	} \
199	if ((sb)->sb_sndptroff != 0) \
200		(sb)->sb_sndptroff -= (m)->m_len; \
201}
202
203#define SB_EMPTY_FIXUP(sb) do {						\
204	if ((sb)->sb_mb == NULL) {					\
205		(sb)->sb_mbtail = NULL;					\
206		(sb)->sb_lastrecord = NULL;				\
207	}								\
208} while (/*CONSTCOND*/0)
209
210#ifdef SOCKBUF_DEBUG
211void	sblastrecordchk(struct sockbuf *, const char *, int);
212#define	SBLASTRECORDCHK(sb)	sblastrecordchk((sb), __FILE__, __LINE__)
213
214void	sblastmbufchk(struct sockbuf *, const char *, int);
215#define	SBLASTMBUFCHK(sb)	sblastmbufchk((sb), __FILE__, __LINE__)
216#else
217#define	SBLASTRECORDCHK(sb)      /* nothing */
218#define	SBLASTMBUFCHK(sb)        /* nothing */
219#endif /* SOCKBUF_DEBUG */
220
221#endif /* _KERNEL */
222
223#endif /* _SYS_SOCKBUF_H_ */
224