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1.1 root 1: /*-
2: * Copyright (c) 1982, 1986, 1990 The Regents of the University of California.
3: * 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. All advertising materials mentioning features or use of this software
14: * must display the following acknowledgement:
15: * This product includes software developed by the University of
16: * California, Berkeley and its contributors.
17: * 4. Neither the name of the University nor the names of its contributors
18: * may be used to endorse or promote products derived from this software
19: * without specific prior written permission.
20: *
21: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31: * SUCH DAMAGE.
32: *
33: * @(#)socketvar.h 7.17 (Berkeley) 5/5/91
34: */
35:
36: /*
37: * Kernel structure per socket.
38: * Contains send and receive buffer queues,
39: * handle on protocol and pointer to protocol
40: * private data and error information.
41: */
42: struct socket {
43: short so_type; /* generic type, see socket.h */
44: short so_options; /* from socket call, see socket.h */
45: short so_linger; /* time to linger while closing */
46: short so_state; /* internal state flags SS_*, below */
47: caddr_t so_pcb; /* protocol control block */
48: struct protosw *so_proto; /* protocol handle */
49: /*
50: * Variables for connection queueing.
51: * Socket where accepts occur is so_head in all subsidiary sockets.
52: * If so_head is 0, socket is not related to an accept.
53: * For head socket so_q0 queues partially completed connections,
54: * while so_q is a queue of connections ready to be accepted.
55: * If a connection is aborted and it has so_head set, then
56: * it has to be pulled out of either so_q0 or so_q.
57: * We allow connections to queue up based on current queue lengths
58: * and limit on number of queued connections for this socket.
59: */
60: struct socket *so_head; /* back pointer to accept socket */
61: struct socket *so_q0; /* queue of partial connections */
62: struct socket *so_q; /* queue of incoming connections */
63: short so_q0len; /* partials on so_q0 */
64: short so_qlen; /* number of connections on so_q */
65: short so_qlimit; /* max number queued connections */
66: short so_timeo; /* connection timeout */
67: u_short so_error; /* error affecting connection */
68: pid_t so_pgid; /* pgid for signals */
69: u_long so_oobmark; /* chars to oob mark */
70: /*
71: * Variables for socket buffering.
72: */
73: struct sockbuf {
74: u_long sb_cc; /* actual chars in buffer */
75: u_long sb_hiwat; /* max actual char count */
76: u_long sb_mbcnt; /* chars of mbufs used */
77: u_long sb_mbmax; /* max chars of mbufs to use */
78: long sb_lowat; /* low water mark */
79: struct mbuf *sb_mb; /* the mbuf chain */
80: struct proc *sb_sel; /* process selecting read/write */
81: short sb_flags; /* flags, see below */
82: short sb_timeo; /* timeout for read/write */
83: } so_rcv, so_snd;
84: #define SB_MAX (64*1024) /* default for max chars in sockbuf */
85: #define SB_LOCK 0x01 /* lock on data queue */
86: #define SB_WANT 0x02 /* someone is waiting to lock */
87: #define SB_WAIT 0x04 /* someone is waiting for data/space */
88: #define SB_SEL 0x08 /* someone is selecting */
89: #define SB_ASYNC 0x10 /* ASYNC I/O, need signals */
90: #define SB_NOTIFY (SB_WAIT|SB_SEL|SB_ASYNC)
91: #define SB_COLL 0x20 /* collision selecting */
92: #define SB_NOINTR 0x40 /* operations not interruptible */
93:
94: caddr_t so_tpcb; /* Wisc. protocol control block XXX */
95: };
96:
97: /*
98: * Socket state bits.
99: */
100: #define SS_NOFDREF 0x001 /* no file table ref any more */
101: #define SS_ISCONNECTED 0x002 /* socket connected to a peer */
102: #define SS_ISCONNECTING 0x004 /* in process of connecting to peer */
103: #define SS_ISDISCONNECTING 0x008 /* in process of disconnecting */
104: #define SS_CANTSENDMORE 0x010 /* can't send more data to peer */
105: #define SS_CANTRCVMORE 0x020 /* can't receive more data from peer */
106: #define SS_RCVATMARK 0x040 /* at mark on input */
107:
108: #define SS_PRIV 0x080 /* privileged for broadcast, raw... */
109: #define SS_NBIO 0x100 /* non-blocking ops */
110: #define SS_ASYNC 0x200 /* async i/o notify */
111: #define SS_ISCONFIRMING 0x400 /* deciding to accept connection req */
112:
113:
114: /*
115: * Macros for sockets and socket buffering.
116: */
117:
118: /*
119: * How much space is there in a socket buffer (so->so_snd or so->so_rcv)?
120: * This is problematical if the fields are unsigned, as the space might
121: * still be negative (cc > hiwat or mbcnt > mbmax). Should detect
122: * overflow and return 0. Should use "lmin" but it doesn't exist now.
123: */
124: #define sbspace(sb) \
125: ((long) imin((int)((sb)->sb_hiwat - (sb)->sb_cc), \
126: (int)((sb)->sb_mbmax - (sb)->sb_mbcnt)))
127:
128: /* do we have to send all at once on a socket? */
129: #define sosendallatonce(so) \
130: ((so)->so_proto->pr_flags & PR_ATOMIC)
131:
132: /* can we read something from so? */
133: #define soreadable(so) \
134: ((so)->so_rcv.sb_cc >= (so)->so_rcv.sb_lowat || \
135: ((so)->so_state & SS_CANTRCVMORE) || \
136: (so)->so_qlen || (so)->so_error)
137:
138: /* can we write something to so? */
139: #define sowriteable(so) \
140: (sbspace(&(so)->so_snd) >= (so)->so_snd.sb_lowat && \
141: (((so)->so_state&SS_ISCONNECTED) || \
142: ((so)->so_proto->pr_flags&PR_CONNREQUIRED)==0) || \
143: ((so)->so_state & SS_CANTSENDMORE) || \
144: (so)->so_error)
145:
146: /* adjust counters in sb reflecting allocation of m */
147: #define sballoc(sb, m) { \
148: (sb)->sb_cc += (m)->m_len; \
149: (sb)->sb_mbcnt += MSIZE; \
150: if ((m)->m_flags & M_EXT) \
151: (sb)->sb_mbcnt += (m)->m_ext.ext_size; \
152: }
153:
154: /* adjust counters in sb reflecting freeing of m */
155: #define sbfree(sb, m) { \
156: (sb)->sb_cc -= (m)->m_len; \
157: (sb)->sb_mbcnt -= MSIZE; \
158: if ((m)->m_flags & M_EXT) \
159: (sb)->sb_mbcnt -= (m)->m_ext.ext_size; \
160: }
161:
162: /*
163: * Set lock on sockbuf sb; sleep if lock is already held.
164: * Unless SB_NOINTR is set on sockbuf, sleep is interruptible.
165: * Returns error without lock if sleep is interrupted.
166: */
167: #define sblock(sb) ((sb)->sb_flags & SB_LOCK ? sb_lock(sb) : \
168: ((sb)->sb_flags |= SB_LOCK, 0))
169:
170: /* release lock on sockbuf sb */
171: #define sbunlock(sb) { \
172: (sb)->sb_flags &= ~SB_LOCK; \
173: if ((sb)->sb_flags & SB_WANT) { \
174: (sb)->sb_flags &= ~SB_WANT; \
175: wakeup((caddr_t)&(sb)->sb_flags); \
176: } \
177: }
178:
179: #define sorwakeup(so) sowakeup((so), &(so)->so_rcv)
180: #define sowwakeup(so) sowakeup((so), &(so)->so_snd)
181:
182: #ifdef KERNEL
183: u_long sb_max;
184: /* to catch callers missing new second argument to sonewconn: */
185: #define sonewconn(head, connstatus) sonewconn1((head), (connstatus))
186: struct socket *sonewconn1 __P((struct socket *head, int connstatus));
187:
188: /* strings for sleep message: */
189: extern char netio[], netcon[], netcls[];
190:
191: /*
192: * File operations on sockets.
193: */
194: int soo_read __P((struct file *fp, struct uio *uio, struct ucred *cred));
195: int soo_write __P((struct file *fp, struct uio *uio, struct ucred *cred));
196: int soo_ioctl __P((struct file *fp, int com, caddr_t data, struct proc *p));
197: int soo_select __P((struct file *fp, int which, struct proc *p));
198: int soo_close __P((struct file *fp, struct proc *p));
199: #endif
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