sys_socket.c revision 1.82
1 /* $NetBSD: sys_socket.c,v 1.82 2024/12/06 18:36:31 riastradh 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 1.82 2024/12/06 18:36:31 riastradh Exp $"); 65 66 #include <sys/param.h> 67 #include <sys/types.h> 68 69 #include <sys/file.h> 70 #include <sys/ioctl.h> 71 #include <sys/kauth.h> 72 #include <sys/mbuf.h> 73 #include <sys/poll.h> 74 #include <sys/proc.h> 75 #include <sys/protosw.h> 76 #include <sys/socket.h> 77 #include <sys/socketvar.h> 78 #include <sys/stat.h> 79 #include <sys/systm.h> 80 81 #include <net/if.h> 82 #include <net/route.h> 83 84 static int soo_fpathconf(struct file *, int, register_t *); 85 static int soo_posix_fadvise(struct file *, off_t, off_t, int); 86 87 const struct fileops socketops = { 88 .fo_name = "socket", 89 .fo_read = soo_read, 90 .fo_write = soo_write, 91 .fo_ioctl = soo_ioctl, 92 .fo_fcntl = fnullop_fcntl, 93 .fo_poll = soo_poll, 94 .fo_stat = soo_stat, 95 .fo_close = soo_close, 96 .fo_kqfilter = soo_kqfilter, 97 .fo_restart = soo_restart, 98 .fo_fpathconf = soo_fpathconf, 99 .fo_posix_fadvise = soo_posix_fadvise, 100 }; 101 102 int (*ifioctl)(struct socket *, u_long, void *, struct lwp *) = (void *)eopnotsupp; 103 104 /* ARGSUSED */ 105 int 106 soo_read(file_t *fp, off_t *offset, struct uio *uio, kauth_cred_t cred, 107 int flags) 108 { 109 struct socket *so = fp->f_socket; 110 int error; 111 112 error = (*so->so_receive)(so, NULL, uio, NULL, NULL, NULL); 113 114 return error; 115 } 116 117 /* ARGSUSED */ 118 int 119 soo_write(file_t *fp, off_t *offset, struct uio *uio, kauth_cred_t cred, 120 int flags) 121 { 122 struct socket *so = fp->f_socket; 123 int error; 124 125 error = (*so->so_send)(so, NULL, uio, NULL, NULL, 0, curlwp); 126 127 return error; 128 } 129 130 int 131 soo_ioctl(file_t *fp, u_long cmd, void *data) 132 { 133 struct socket *so = fp->f_socket; 134 int error = 0; 135 136 switch (cmd) { 137 138 case FIONBIO: 139 solock(so); 140 if (*(int *)data) 141 so->so_state |= SS_NBIO; 142 else 143 so->so_state &= ~SS_NBIO; 144 sounlock(so); 145 break; 146 147 case FIOASYNC: 148 solock(so); 149 if (*(int *)data) { 150 so->so_rcv.sb_flags |= SB_ASYNC; 151 so->so_snd.sb_flags |= SB_ASYNC; 152 } else { 153 so->so_rcv.sb_flags &= ~SB_ASYNC; 154 so->so_snd.sb_flags &= ~SB_ASYNC; 155 } 156 sounlock(so); 157 break; 158 159 case FIONREAD: 160 *(int *)data = so->so_rcv.sb_cc; 161 break; 162 163 case FIONWRITE: 164 *(int *)data = so->so_snd.sb_cc; 165 break; 166 167 case FIONSPACE: 168 /* 169 * See the comment around sbspace()'s definition 170 * in sys/socketvar.h in face of counts about maximum 171 * to understand the following test. We detect overflow 172 * and return zero. 173 */ 174 solock(so); 175 if ((so->so_snd.sb_hiwat < so->so_snd.sb_cc) 176 || (so->so_snd.sb_mbmax < so->so_snd.sb_mbcnt)) 177 *(int *)data = 0; 178 else 179 *(int *)data = sbspace(&so->so_snd); 180 sounlock(so); 181 break; 182 183 case SIOCSPGRP: 184 case FIOSETOWN: 185 case TIOCSPGRP: 186 error = fsetown(&so->so_pgid, cmd, data); 187 break; 188 189 case SIOCGPGRP: 190 case FIOGETOWN: 191 case TIOCGPGRP: 192 error = fgetown(so->so_pgid, cmd, data); 193 break; 194 195 case SIOCATMARK: 196 *(int *)data = (so->so_state&SS_RCVATMARK) != 0; 197 break; 198 199 case SIOCPEELOFF: 200 solock(so); 201 error = do_sys_peeloff(so, data); 202 sounlock(so); 203 break; 204 205 default: 206 /* 207 * Interface/routing/protocol specific ioctls: 208 * interface and routing ioctls should have a 209 * different entry since a socket's unnecessary 210 */ 211 if (IOCGROUP(cmd) == 'i') 212 /* 213 * KERNEL_LOCK will be held later if if_ioctl() of the 214 * interface isn't MP-safe. 215 */ 216 error = ifioctl(so, cmd, data, curlwp); 217 else { 218 KERNEL_LOCK(1, NULL); 219 error = (*so->so_proto->pr_usrreqs->pr_ioctl)(so, 220 cmd, data, NULL); 221 KERNEL_UNLOCK_ONE(NULL); 222 } 223 break; 224 } 225 226 227 return error; 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 } 272 273 static int 274 soo_fpathconf(struct file *fp, int name, register_t *retval) 275 { 276 277 switch (name) { 278 case _PC_PIPE_BUF: 279 *retval = PIPE_BUF; 280 return 0; 281 default: 282 return EINVAL; 283 } 284 } 285 286 static int 287 soo_posix_fadvise(struct file *fp, off_t offset, off_t len, int advice) 288 { 289 290 return ESPIPE; 291 } 292
Indexes created Sun Sep 21 19:09:51 GMT 2025