sys_socket.c revision 1.76
1 /* $NetBSD: sys_socket.c,v 1.76 2017/11/30 20:25:55 christos 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 1.76 2017/11/30 20:25:55 christos 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_name = "socket", 85 .fo_read = soo_read, 86 .fo_write = soo_write, 87 .fo_ioctl = soo_ioctl, 88 .fo_fcntl = soo_fcntl, 89 .fo_poll = soo_poll, 90 .fo_stat = soo_stat, 91 .fo_close = soo_close, 92 .fo_kqfilter = soo_kqfilter, 93 .fo_restart = soo_restart, 94 }; 95 96 int (*ifioctl)(struct socket *, u_long, void *, struct lwp *) = (void *)eopnotsupp; 97 98 /* ARGSUSED */ 99 int 100 soo_read(file_t *fp, off_t *offset, struct uio *uio, kauth_cred_t cred, 101 int flags) 102 { 103 struct socket *so = fp->f_socket; 104 int error; 105 106 error = (*so->so_receive)(so, NULL, uio, NULL, NULL, NULL); 107 108 return error; 109 } 110 111 /* ARGSUSED */ 112 int 113 soo_write(file_t *fp, off_t *offset, struct uio *uio, kauth_cred_t cred, 114 int flags) 115 { 116 struct socket *so = fp->f_socket; 117 int error; 118 119 error = (*so->so_send)(so, NULL, uio, NULL, NULL, 0, curlwp); 120 121 return error; 122 } 123 124 int 125 soo_ioctl(file_t *fp, u_long cmd, void *data) 126 { 127 struct socket *so = fp->f_socket; 128 int error = 0; 129 130 switch (cmd) { 131 132 case FIONBIO: 133 solock(so); 134 if (*(int *)data) 135 so->so_state |= SS_NBIO; 136 else 137 so->so_state &= ~SS_NBIO; 138 sounlock(so); 139 break; 140 141 case FIOASYNC: 142 solock(so); 143 if (*(int *)data) { 144 so->so_state |= SS_ASYNC; 145 so->so_rcv.sb_flags |= SB_ASYNC; 146 so->so_snd.sb_flags |= SB_ASYNC; 147 } else { 148 so->so_state &= ~SS_ASYNC; 149 so->so_rcv.sb_flags &= ~SB_ASYNC; 150 so->so_snd.sb_flags &= ~SB_ASYNC; 151 } 152 sounlock(so); 153 break; 154 155 case FIONREAD: 156 *(int *)data = so->so_rcv.sb_cc; 157 break; 158 159 case FIONWRITE: 160 *(int *)data = so->so_snd.sb_cc; 161 break; 162 163 case FIONSPACE: 164 /* 165 * See the comment around sbspace()'s definition 166 * in sys/socketvar.h in face of counts about maximum 167 * to understand the following test. We detect overflow 168 * and return zero. 169 */ 170 solock(so); 171 if ((so->so_snd.sb_hiwat < so->so_snd.sb_cc) 172 || (so->so_snd.sb_mbmax < so->so_snd.sb_mbcnt)) 173 *(int *)data = 0; 174 else 175 *(int *)data = sbspace(&so->so_snd); 176 sounlock(so); 177 break; 178 179 case SIOCSPGRP: 180 case FIOSETOWN: 181 case TIOCSPGRP: 182 error = fsetown(&so->so_pgid, cmd, data); 183 break; 184 185 case SIOCGPGRP: 186 case FIOGETOWN: 187 case TIOCGPGRP: 188 error = fgetown(so->so_pgid, cmd, data); 189 break; 190 191 case SIOCATMARK: 192 *(int *)data = (so->so_state&SS_RCVATMARK) != 0; 193 break; 194 195 default: 196 /* 197 * Interface/routing/protocol specific ioctls: 198 * interface and routing ioctls should have a 199 * different entry since a socket's unnecessary 200 */ 201 if (IOCGROUP(cmd) == 'i') 202 /* 203 * KERNEL_LOCK will be held later if if_ioctl() of the 204 * interface isn't MP-safe. 205 */ 206 error = ifioctl(so, cmd, data, curlwp); 207 else { 208 KERNEL_LOCK(1, NULL); 209 error = (*so->so_proto->pr_usrreqs->pr_ioctl)(so, 210 cmd, data, NULL); 211 KERNEL_UNLOCK_ONE(NULL); 212 } 213 break; 214 } 215 216 217 return error; 218 } 219 220 int 221 soo_fcntl(file_t *fp, u_int cmd, void *data) 222 { 223 224 if (cmd == F_SETFL) 225 return 0; 226 else 227 return EOPNOTSUPP; 228 } 229 230 int 231 soo_poll(file_t *fp, int events) 232 { 233 234 return sopoll(fp->f_socket, events); 235 } 236 237 int 238 soo_stat(file_t *fp, struct stat *ub) 239 { 240 struct socket *so = fp->f_socket; 241 int error; 242 243 memset(ub, 0, sizeof(*ub)); 244 ub->st_mode = S_IFSOCK; 245 246 solock(so); 247 error = (*so->so_proto->pr_usrreqs->pr_stat)(so, ub); 248 sounlock(so); 249 250 return error; 251 } 252 253 /* ARGSUSED */ 254 int 255 soo_close(file_t *fp) 256 { 257 int error = 0; 258 259 if (fp->f_socket) 260 error = soclose(fp->f_socket); 261 fp->f_socket = NULL; 262 263 return error; 264 } 265 266 void 267 soo_restart(file_t *fp) 268 { 269 270 sorestart(fp->f_socket); 271 } 272
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