socketvar.h revision 1541
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 * 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 8.1 (Berkeley) 6/2/93 34 */ 35 36#include <sys/select.h> /* for struct selinfo */ 37 38/* 39 * Kernel structure per socket. 40 * Contains send and receive buffer queues, 41 * handle on protocol and pointer to protocol 42 * private data and error information. 43 */ 44struct socket { 45 short so_type; /* generic type, see socket.h */ 46 short so_options; /* from socket call, see socket.h */ 47 short so_linger; /* time to linger while closing */ 48 short so_state; /* internal state flags SS_*, below */ 49 caddr_t so_pcb; /* protocol control block */ 50 struct protosw *so_proto; /* protocol handle */ 51/* 52 * Variables for connection queueing. 53 * Socket where accepts occur is so_head in all subsidiary sockets. 54 * If so_head is 0, socket is not related to an accept. 55 * For head socket so_q0 queues partially completed connections, 56 * while so_q is a queue of connections ready to be accepted. 57 * If a connection is aborted and it has so_head set, then 58 * it has to be pulled out of either so_q0 or so_q. 59 * We allow connections to queue up based on current queue lengths 60 * and limit on number of queued connections for this socket. 61 */ 62 struct socket *so_head; /* back pointer to accept socket */ 63 struct socket *so_q0; /* queue of partial connections */ 64 struct socket *so_q; /* queue of incoming connections */ 65 short so_q0len; /* partials on so_q0 */ 66 short so_qlen; /* number of connections on so_q */ 67 short so_qlimit; /* max number queued connections */ 68 short so_timeo; /* connection timeout */ 69 u_short so_error; /* error affecting connection */ 70 pid_t so_pgid; /* pgid for signals */ 71 u_long so_oobmark; /* chars to oob mark */ 72/* 73 * Variables for socket buffering. 74 */ 75 struct sockbuf { 76 u_long sb_cc; /* actual chars in buffer */ 77 u_long sb_hiwat; /* max actual char count */ 78 u_long sb_mbcnt; /* chars of mbufs used */ 79 u_long sb_mbmax; /* max chars of mbufs to use */ 80 long sb_lowat; /* low water mark */ 81 struct mbuf *sb_mb; /* the mbuf chain */ 82 struct selinfo sb_sel; /* process selecting read/write */ 83 short sb_flags; /* flags, see below */ 84 short sb_timeo; /* timeout for read/write */ 85 } so_rcv, so_snd; 86#define SB_MAX (256*1024) /* default for max chars in sockbuf */ 87#define SB_LOCK 0x01 /* lock on data queue */ 88#define SB_WANT 0x02 /* someone is waiting to lock */ 89#define SB_WAIT 0x04 /* someone is waiting for data/space */ 90#define SB_SEL 0x08 /* someone is selecting */ 91#define SB_ASYNC 0x10 /* ASYNC I/O, need signals */ 92#define SB_NOTIFY (SB_WAIT|SB_SEL|SB_ASYNC) 93#define SB_NOINTR 0x40 /* operations not interruptible */ 94 95 caddr_t so_tpcb; /* Wisc. protocol control block XXX */ 96 void (*so_upcall) __P((struct socket *so, caddr_t arg, int waitf)); 97 caddr_t so_upcallarg; /* Arg for above */ 98}; 99 100/* 101 * Socket state bits. 102 */ 103#define SS_NOFDREF 0x001 /* no file table ref any more */ 104#define SS_ISCONNECTED 0x002 /* socket connected to a peer */ 105#define SS_ISCONNECTING 0x004 /* in process of connecting to peer */ 106#define SS_ISDISCONNECTING 0x008 /* in process of disconnecting */ 107#define SS_CANTSENDMORE 0x010 /* can't send more data to peer */ 108#define SS_CANTRCVMORE 0x020 /* can't receive more data from peer */ 109#define SS_RCVATMARK 0x040 /* at mark on input */ 110 111#define SS_PRIV 0x080 /* privileged for broadcast, raw... */ 112#define SS_NBIO 0x100 /* non-blocking ops */ 113#define SS_ASYNC 0x200 /* async i/o notify */ 114#define SS_ISCONFIRMING 0x400 /* deciding to accept connection req */ 115 116 117/* 118 * Macros for sockets and socket buffering. 119 */ 120 121/* 122 * How much space is there in a socket buffer (so->so_snd or so->so_rcv)? 123 * This is problematical if the fields are unsigned, as the space might 124 * still be negative (cc > hiwat or mbcnt > mbmax). Should detect 125 * overflow and return 0. Should use "lmin" but it doesn't exist now. 126 */ 127#define sbspace(sb) \ 128 ((long) imin((int)((sb)->sb_hiwat - (sb)->sb_cc), \ 129 (int)((sb)->sb_mbmax - (sb)->sb_mbcnt))) 130 131/* do we have to send all at once on a socket? */ 132#define sosendallatonce(so) \ 133 ((so)->so_proto->pr_flags & PR_ATOMIC) 134 135/* can we read something from so? */ 136#define soreadable(so) \ 137 ((so)->so_rcv.sb_cc >= (so)->so_rcv.sb_lowat || \ 138 ((so)->so_state & SS_CANTRCVMORE) || \ 139 (so)->so_qlen || (so)->so_error) 140 141/* can we write something to so? */ 142#define sowriteable(so) \ 143 (sbspace(&(so)->so_snd) >= (so)->so_snd.sb_lowat && \ 144 (((so)->so_state&SS_ISCONNECTED) || \ 145 ((so)->so_proto->pr_flags&PR_CONNREQUIRED)==0) || \ 146 ((so)->so_state & SS_CANTSENDMORE) || \ 147 (so)->so_error) 148 149/* adjust counters in sb reflecting allocation of m */ 150#define sballoc(sb, m) { \ 151 (sb)->sb_cc += (m)->m_len; \ 152 (sb)->sb_mbcnt += MSIZE; \ 153 if ((m)->m_flags & M_EXT) \ 154 (sb)->sb_mbcnt += (m)->m_ext.ext_size; \ 155} 156 157/* adjust counters in sb reflecting freeing of m */ 158#define sbfree(sb, m) { \ 159 (sb)->sb_cc -= (m)->m_len; \ 160 (sb)->sb_mbcnt -= MSIZE; \ 161 if ((m)->m_flags & M_EXT) \ 162 (sb)->sb_mbcnt -= (m)->m_ext.ext_size; \ 163} 164 165/* 166 * Set lock on sockbuf sb; sleep if lock is already held. 167 * Unless SB_NOINTR is set on sockbuf, sleep is interruptible. 168 * Returns error without lock if sleep is interrupted. 169 */ 170#define sblock(sb, wf) ((sb)->sb_flags & SB_LOCK ? \ 171 (((wf) == M_WAITOK) ? sb_lock(sb) : EWOULDBLOCK) : \ 172 ((sb)->sb_flags |= SB_LOCK), 0) 173 174/* release lock on sockbuf sb */ 175#define sbunlock(sb) { \ 176 (sb)->sb_flags &= ~SB_LOCK; \ 177 if ((sb)->sb_flags & SB_WANT) { \ 178 (sb)->sb_flags &= ~SB_WANT; \ 179 wakeup((caddr_t)&(sb)->sb_flags); \ 180 } \ 181} 182 183#define sorwakeup(so) { sowakeup((so), &(so)->so_rcv); \ 184 if ((so)->so_upcall) \ 185 (*((so)->so_upcall))((so), (so)->so_upcallarg, M_DONTWAIT); \ 186 } 187 188#define sowwakeup(so) sowakeup((so), &(so)->so_snd) 189 190#ifdef KERNEL 191u_long sb_max; 192/* to catch callers missing new second argument to sonewconn: */ 193#define sonewconn(head, connstatus) sonewconn1((head), (connstatus)) 194struct socket *sonewconn1 __P((struct socket *head, int connstatus)); 195 196/* strings for sleep message: */ 197extern char netio[], netcon[], netcls[]; 198 199/* 200 * File operations on sockets. 201 */ 202int soo_read __P((struct file *fp, struct uio *uio, struct ucred *cred)); 203int soo_write __P((struct file *fp, struct uio *uio, struct ucred *cred)); 204int soo_ioctl __P((struct file *fp, int com, caddr_t data, struct proc *p)); 205int soo_select __P((struct file *fp, int which, struct proc *p)); 206int soo_close __P((struct file *fp, struct proc *p)); 207#endif 208