1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 28 /* All Rights Reserved */ 29 30 /* 31 * This module establishes a unique connection on 32 * a STREAMS-based pipe. 33 */ 34 #include <sys/types.h> 35 #include <sys/sysmacros.h> 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/errno.h> 39 #include <sys/signal.h> 40 #include <sys/user.h> 41 #include <sys/fstyp.h> 42 #include <sys/stropts.h> 43 #include <sys/stream.h> 44 #include <sys/strsubr.h> 45 #include <sys/vnode.h> 46 #include <sys/file.h> 47 #include <sys/fs/fifonode.h> 48 #include <sys/debug.h> 49 #include <sys/ddi.h> 50 51 /* 52 * This is the loadable module wrapper. 53 */ 54 #include <sys/conf.h> 55 #include <sys/modctl.h> 56 57 extern struct streamtab conninfo; 58 59 static struct fmodsw fsw = { 60 "connld", 61 &conninfo, 62 D_NEW | D_MP 63 }; 64 65 /* 66 * Module linkage information for the kernel. 67 */ 68 69 static struct modlstrmod modlstrmod = { 70 &mod_strmodops, "Streams-based pipes", &fsw 71 }; 72 73 static struct modlinkage modlinkage = { 74 MODREV_1, (void *)&modlstrmod, NULL 75 }; 76 77 int 78 _init() 79 { 80 return (mod_install(&modlinkage)); 81 } 82 83 int 84 _fini() 85 { 86 return (mod_remove(&modlinkage)); 87 } 88 89 int 90 _info(struct modinfo *modinfop) 91 { 92 return (mod_info(&modlinkage, modinfop)); 93 } 94 95 /* 96 * Define local and external routines. 97 */ 98 int connopen(queue_t *, dev_t *, int, int, cred_t *); 99 int connclose(queue_t *, int, cred_t *); 100 int connput(queue_t *, mblk_t *); 101 102 /* 103 * Define STREAMS header information. 104 */ 105 static struct module_info conn_info = { 106 1003, 107 "connld", 108 0, 109 INFPSZ, 110 STRHIGH, 111 STRLOW 112 }; 113 static struct qinit connrinit = { 114 connput, 115 NULL, 116 connopen, 117 connclose, 118 NULL, 119 &conn_info, 120 NULL 121 }; 122 static struct qinit connwinit = { 123 connput, 124 NULL, 125 NULL, 126 NULL, 127 NULL, 128 &conn_info, 129 NULL 130 }; 131 struct streamtab conninfo = { 132 &connrinit, 133 &connwinit 134 }; 135 136 /* 137 * For each invocation of connopen(), create a new pipe. One end of the pipe 138 * is sent to the process on the other end of this STREAM. The vnode for 139 * the other end is returned to the open() system call as the vnode for 140 * the opened object. 141 * 142 * On the first invocation of connopen(), a flag is set and the routine 143 * returns 0, since the first open corresponds to the pushing of the module. 144 */ 145 /*ARGSUSED*/ 146 int 147 connopen(queue_t *rqp, dev_t *devp, int flag, int sflag, cred_t *crp) 148 { 149 int error = 0; 150 vnode_t *streamvp; 151 fifonode_t *streamfnp; 152 153 if ((streamvp = strq2vp(rqp)) == NULL) { 154 return (EINVAL); 155 } 156 157 /* 158 * CONNLD is only allowed to be pushed onto a "pipe" that has both 159 * of its ends open. 160 */ 161 if (streamvp->v_type != VFIFO) { 162 error = EINVAL; 163 goto out; 164 } 165 166 streamfnp = VTOF(streamvp); 167 168 if (!(streamfnp->fn_flag & ISPIPE) || 169 streamfnp->fn_dest->fn_open == 0) { 170 error = EPIPE; 171 goto out; 172 } 173 174 /* 175 * If this is the first time CONNLD was opened while on this stream, 176 * it is being pushed. Therefore, set a flag and return 0. 177 */ 178 if (rqp->q_ptr == 0) { 179 if (streamfnp->fn_flag & FIFOCONNLD) { 180 error = ENXIO; 181 goto out; 182 } 183 rqp->q_ptr = (caddr_t)1; 184 streamfnp->fn_flag |= FIFOCONNLD; 185 qprocson(rqp); 186 } 187 out: 188 VN_RELE(streamvp); 189 return (error); 190 } 191 192 /*ARGSUSED*/ 193 int 194 connclose(queue_t *q, int cflag, cred_t *crp) 195 { 196 vnode_t *streamvp; 197 fifonode_t *streamfnp; 198 199 qprocsoff(q); 200 streamvp = strq2vp(q); 201 202 ASSERT(streamvp != NULL); 203 ASSERT(streamvp->v_type == VFIFO); 204 205 streamfnp = VTOF(streamvp); 206 streamfnp->fn_flag &= ~FIFOCONNLD; 207 VN_RELE(streamvp); 208 return (0); 209 } 210 211 /* 212 * Use same put procedure for write and read queues. 213 */ 214 int 215 connput(queue_t *q, mblk_t *bp) 216 { 217 putnext(q, bp); 218 return (0); 219 } 220