1 /* $NetBSD: sys_socket.c,v 1.64 2011/06/30 22:38:50 dyoung 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 1.64 2011/06/30 22:38:50 dyoung 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, NULL, uio, NULL, NULL, NULL); 104 105 return error; 106 } 107 108 /* ARGSUSED */ 109 int 110 soo_write(file_t *fp, off_t *offset, struct uio *uio, kauth_cred_t cred, 111 int flags) 112 { 113 struct socket *so = fp->f_data; 114 int error; 115 116 error = (*so->so_send)(so, NULL, uio, NULL, NULL, 0, curlwp); 117 118 return error; 119 } 120 121 int 122 soo_ioctl(file_t *fp, u_long cmd, void *data) 123 { 124 struct socket *so = fp->f_data; 125 int error = 0; 126 127 switch (cmd) { 128 129 case FIONBIO: 130 /* No reason to lock and this call is made very often. */ 131 so->so_nbio = *(int *)data; 132 break; 133 134 case FIOASYNC: 135 solock(so); 136 if (*(int *)data) { 137 so->so_state |= SS_ASYNC; 138 so->so_rcv.sb_flags |= SB_ASYNC; 139 so->so_snd.sb_flags |= SB_ASYNC; 140 } else { 141 so->so_state &= ~SS_ASYNC; 142 so->so_rcv.sb_flags &= ~SB_ASYNC; 143 so->so_snd.sb_flags &= ~SB_ASYNC; 144 } 145 sounlock(so); 146 break; 147 148 case FIONREAD: 149 *(int *)data = so->so_rcv.sb_cc; 150 break; 151 152 case FIONWRITE: 153 *(int *)data = so->so_snd.sb_cc; 154 break; 155 156 case FIONSPACE: 157 /* 158 * See the comment around sbspace()'s definition 159 * in sys/socketvar.h in face of counts about maximum 160 * to understand the following test. We detect overflow 161 * and return zero. 162 */ 163 solock(so); 164 if ((so->so_snd.sb_hiwat < so->so_snd.sb_cc) 165 || (so->so_snd.sb_mbmax < so->so_snd.sb_mbcnt)) 166 *(int *)data = 0; 167 else 168 *(int *)data = sbspace(&so->so_snd); 169 sounlock(so); 170 break; 171 172 case SIOCSPGRP: 173 case FIOSETOWN: 174 case TIOCSPGRP: 175 error = fsetown(&so->so_pgid, cmd, data); 176 break; 177 178 case SIOCGPGRP: 179 case FIOGETOWN: 180 case TIOCGPGRP: 181 error = fgetown(so->so_pgid, cmd, data); 182 break; 183 184 case SIOCATMARK: 185 *(int *)data = (so->so_state&SS_RCVATMARK) != 0; 186 break; 187 188 default: 189 /* 190 * Interface/routing/protocol specific ioctls: 191 * interface and routing ioctls should have a 192 * different entry since a socket's unnecessary 193 */ 194 KERNEL_LOCK(1, NULL); 195 if (IOCGROUP(cmd) == 'i') 196 error = ifioctl(so, cmd, data, curlwp); 197 else if (IOCGROUP(cmd) == 'r') 198 error = rtioctl(cmd, data, curlwp); 199 else { 200 error = (*so->so_proto->pr_usrreq)(so, PRU_CONTROL, 201 (struct mbuf *)cmd, (struct mbuf *)data, NULL, 202 curlwp); 203 } 204 KERNEL_UNLOCK_ONE(NULL); 205 break; 206 } 207 208 209 return error; 210 } 211 212 int 213 soo_fcntl(file_t *fp, u_int cmd, void *data) 214 { 215 216 if (cmd == F_SETFL) 217 return 0; 218 else 219 return EOPNOTSUPP; 220 } 221 222 int 223 soo_poll(file_t *fp, int events) 224 { 225 226 return sopoll(fp->f_data, events); 227 } 228 229 int 230 soo_stat(file_t *fp, struct stat *ub) 231 { 232 struct socket *so = fp->f_data; 233 int error; 234 235 memset(ub, 0, sizeof(*ub)); 236 ub->st_mode = S_IFSOCK; 237 238 solock(so); 239 error = (*so->so_proto->pr_usrreq)(so, PRU_SENSE, 240 (struct mbuf *)ub, NULL, NULL, curlwp); 241 sounlock(so); 242 243 return error; 244 } 245 246 /* ARGSUSED */ 247 int 248 soo_close(file_t *fp) 249 { 250 int error = 0; 251 252 if (fp->f_data) 253 error = soclose(fp->f_data); 254 fp->f_data = 0; 255 256 return error; 257 } 258 259 void 260 soo_restart(file_t *fp) 261 { 262 263 sorestart(fp->f_data); 264 } 265