sys_socket.c revision 1.63
1 /* $NetBSD: sys_socket.c,v 1.63 2009/12/20 09:36:06 dsl Exp $ */ 2 3 /*- 4 * Copyright (c) 2008, 2009 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Andrew Doran. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 1982, 1986, 1990, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 3. Neither the name of the University nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 * 60 * @(#)sys_socket.c 8.3 (Berkeley) 2/14/95 61 */ 62 63 #include <sys/cdefs.h> 64 __KERNEL_RCSID(0, "$NetBSD: sys_socket.c,v 1.63 2009/12/20 09:36:06 dsl Exp $"); 65 66 #include <sys/param.h> 67 #include <sys/systm.h> 68 #include <sys/systm.h> 69 #include <sys/file.h> 70 #include <sys/mbuf.h> 71 #include <sys/protosw.h> 72 #include <sys/socket.h> 73 #include <sys/socketvar.h> 74 #include <sys/ioctl.h> 75 #include <sys/stat.h> 76 #include <sys/poll.h> 77 #include <sys/proc.h> 78 #include <sys/kauth.h> 79 80 #include <net/if.h> 81 #include <net/route.h> 82 83 const struct fileops socketops = { 84 .fo_read = soo_read, 85 .fo_write = soo_write, 86 .fo_ioctl = soo_ioctl, 87 .fo_fcntl = soo_fcntl, 88 .fo_poll = soo_poll, 89 .fo_stat = soo_stat, 90 .fo_close = soo_close, 91 .fo_kqfilter = soo_kqfilter, 92 .fo_restart = soo_restart, 93 }; 94 95 /* ARGSUSED */ 96 int 97 soo_read(file_t *fp, off_t *offset, struct uio *uio, kauth_cred_t cred, 98 int flags) 99 { 100 struct socket *so = fp->f_data; 101 int error; 102 103 error = (*so->so_receive)(so, (struct mbuf **)0, 104 uio, (struct mbuf **)0, (struct mbuf **)0, (int *)0); 105 106 return error; 107 } 108 109 /* ARGSUSED */ 110 int 111 soo_write(file_t *fp, off_t *offset, struct uio *uio, kauth_cred_t cred, 112 int flags) 113 { 114 struct socket *so = fp->f_data; 115 int error; 116 117 error = (*so->so_send)(so, (struct mbuf *)0, 118 uio, (struct mbuf *)0, (struct mbuf *)0, 0, curlwp); 119 120 return error; 121 } 122 123 int 124 soo_ioctl(file_t *fp, u_long cmd, void *data) 125 { 126 struct socket *so = fp->f_data; 127 int error = 0; 128 129 switch (cmd) { 130 131 case FIONBIO: 132 /* No reason to lock and this call is made very often. */ 133 so->so_nbio = *(int *)data; 134 break; 135 136 case FIOASYNC: 137 solock(so); 138 if (*(int *)data) { 139 so->so_state |= SS_ASYNC; 140 so->so_rcv.sb_flags |= SB_ASYNC; 141 so->so_snd.sb_flags |= SB_ASYNC; 142 } else { 143 so->so_state &= ~SS_ASYNC; 144 so->so_rcv.sb_flags &= ~SB_ASYNC; 145 so->so_snd.sb_flags &= ~SB_ASYNC; 146 } 147 sounlock(so); 148 break; 149 150 case FIONREAD: 151 *(int *)data = so->so_rcv.sb_cc; 152 break; 153 154 case FIONWRITE: 155 *(int *)data = so->so_snd.sb_cc; 156 break; 157 158 case FIONSPACE: 159 /* 160 * See the comment around sbspace()'s definition 161 * in sys/socketvar.h in face of counts about maximum 162 * to understand the following test. We detect overflow 163 * and return zero. 164 */ 165 solock(so); 166 if ((so->so_snd.sb_hiwat < so->so_snd.sb_cc) 167 || (so->so_snd.sb_mbmax < so->so_snd.sb_mbcnt)) 168 *(int *)data = 0; 169 else 170 *(int *)data = sbspace(&so->so_snd); 171 sounlock(so); 172 break; 173 174 case SIOCSPGRP: 175 case FIOSETOWN: 176 case TIOCSPGRP: 177 error = fsetown(&so->so_pgid, cmd, data); 178 break; 179 180 case SIOCGPGRP: 181 case FIOGETOWN: 182 case TIOCGPGRP: 183 error = fgetown(so->so_pgid, cmd, data); 184 break; 185 186 case SIOCATMARK: 187 *(int *)data = (so->so_state&SS_RCVATMARK) != 0; 188 break; 189 190 default: 191 /* 192 * Interface/routing/protocol specific ioctls: 193 * interface and routing ioctls should have a 194 * different entry since a socket's unnecessary 195 */ 196 KERNEL_LOCK(1, NULL); 197 if (IOCGROUP(cmd) == 'i') 198 error = ifioctl(so, cmd, data, curlwp); 199 else if (IOCGROUP(cmd) == 'r') 200 error = rtioctl(cmd, data, curlwp); 201 else { 202 error = (*so->so_proto->pr_usrreq)(so, PRU_CONTROL, 203 (struct mbuf *)cmd, (struct mbuf *)data, NULL, 204 curlwp); 205 } 206 KERNEL_UNLOCK_ONE(NULL); 207 break; 208 } 209 210 211 return error; 212 } 213 214 int 215 soo_fcntl(file_t *fp, u_int cmd, void *data) 216 { 217 218 if (cmd == F_SETFL) 219 return 0; 220 else 221 return EOPNOTSUPP; 222 } 223 224 int 225 soo_poll(file_t *fp, int events) 226 { 227 228 return sopoll(fp->f_data, events); 229 } 230 231 int 232 soo_stat(file_t *fp, struct stat *ub) 233 { 234 struct socket *so = fp->f_data; 235 int error; 236 237 memset((void *)ub, 0, sizeof(*ub)); 238 ub->st_mode = S_IFSOCK; 239 240 solock(so); 241 error = (*so->so_proto->pr_usrreq)(so, PRU_SENSE, 242 (struct mbuf *)ub, (struct mbuf *)0, (struct mbuf *)0, 243 curlwp); 244 sounlock(so); 245 246 return error; 247 } 248 249 /* ARGSUSED */ 250 int 251 soo_close(file_t *fp) 252 { 253 int error = 0; 254 255 if (fp->f_data) 256 error = soclose(fp->f_data); 257 fp->f_data = 0; 258 259 return error; 260 } 261 262 void 263 soo_restart(file_t *fp) 264 { 265 266 sorestart(fp->f_data); 267 } 268
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