sys_socket.c revision 1.84
1 /* $NetBSD: sys_socket.c,v 1.84 2024/12/06 18:44:00 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 1.84 2024/12/06 18:44:00 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/sdt.h> 77 #include <sys/socket.h> 78 #include <sys/socketvar.h> 79 #include <sys/stat.h> 80 #include <sys/systm.h> 81 82 #include <net/if.h> 83 #include <net/route.h> 84 85 static int soo_fpathconf(struct file *, int, register_t *); 86 static int soo_posix_fadvise(struct file *, off_t, off_t, int); 87 88 const struct fileops socketops = { 89 .fo_name = "socket", 90 .fo_read = soo_read, 91 .fo_write = soo_write, 92 .fo_ioctl = soo_ioctl, 93 .fo_fcntl = fnullop_fcntl, 94 .fo_poll = soo_poll, 95 .fo_stat = soo_stat, 96 .fo_close = soo_close, 97 .fo_kqfilter = soo_kqfilter, 98 .fo_restart = soo_restart, 99 .fo_fpathconf = soo_fpathconf, 100 .fo_posix_fadvise = soo_posix_fadvise, 101 }; 102 103 int (*ifioctl)(struct socket *, u_long, void *, struct lwp *) = (void *)eopnotsupp; 104 105 /* ARGSUSED */ 106 int 107 soo_read(file_t *fp, off_t *offset, struct uio *uio, kauth_cred_t cred, 108 int flags) 109 { 110 struct socket *so = fp->f_socket; 111 int error; 112 113 error = (*so->so_receive)(so, NULL, uio, NULL, NULL, NULL); 114 115 return error; 116 } 117 118 /* ARGSUSED */ 119 int 120 soo_write(file_t *fp, off_t *offset, struct uio *uio, kauth_cred_t cred, 121 int flags) 122 { 123 struct socket *so = fp->f_socket; 124 int error; 125 126 error = (*so->so_send)(so, NULL, uio, NULL, NULL, 0, curlwp); 127 128 return error; 129 } 130 131 int 132 soo_ioctl(file_t *fp, u_long cmd, void *data) 133 { 134 struct socket *so = fp->f_socket; 135 int error = 0; 136 137 switch (cmd) { 138 139 case FIONBIO: 140 solock(so); 141 if (*(int *)data) 142 so->so_state |= SS_NBIO; 143 else 144 so->so_state &= ~SS_NBIO; 145 sounlock(so); 146 break; 147 148 case FIOASYNC: 149 solock(so); 150 if (*(int *)data) { 151 so->so_rcv.sb_flags |= SB_ASYNC; 152 so->so_snd.sb_flags |= SB_ASYNC; 153 } else { 154 so->so_rcv.sb_flags &= ~SB_ASYNC; 155 so->so_snd.sb_flags &= ~SB_ASYNC; 156 } 157 sounlock(so); 158 break; 159 160 case FIONREAD: 161 *(int *)data = so->so_rcv.sb_cc; 162 break; 163 164 case FIONWRITE: 165 *(int *)data = so->so_snd.sb_cc; 166 break; 167 168 case FIONSPACE: 169 /* 170 * See the comment around sbspace()'s definition 171 * in sys/socketvar.h in face of counts about maximum 172 * to understand the following test. We detect overflow 173 * and return zero. 174 */ 175 solock(so); 176 if ((so->so_snd.sb_hiwat < so->so_snd.sb_cc) 177 || (so->so_snd.sb_mbmax < so->so_snd.sb_mbcnt)) 178 *(int *)data = 0; 179 else 180 *(int *)data = sbspace(&so->so_snd); 181 sounlock(so); 182 break; 183 184 case SIOCSPGRP: 185 case FIOSETOWN: 186 case TIOCSPGRP: 187 error = fsetown(&so->so_pgid, cmd, data); 188 break; 189 190 case SIOCGPGRP: 191 case FIOGETOWN: 192 case TIOCGPGRP: 193 error = fgetown(so->so_pgid, cmd, data); 194 break; 195 196 case SIOCATMARK: 197 *(int *)data = (so->so_state&SS_RCVATMARK) != 0; 198 break; 199 200 case SIOCPEELOFF: 201 solock(so); 202 error = do_sys_peeloff(so, data); 203 sounlock(so); 204 break; 205 206 default: 207 /* 208 * Interface/routing/protocol specific ioctls: 209 * interface and routing ioctls should have a 210 * different entry since a socket's unnecessary 211 */ 212 if (IOCGROUP(cmd) == 'i') 213 /* 214 * KERNEL_LOCK will be held later if if_ioctl() of the 215 * interface isn't MP-safe. 216 */ 217 error = ifioctl(so, cmd, data, curlwp); 218 else { 219 KERNEL_LOCK(1, NULL); 220 error = (*so->so_proto->pr_usrreqs->pr_ioctl)(so, 221 cmd, data, NULL); 222 KERNEL_UNLOCK_ONE(NULL); 223 } 224 break; 225 } 226 227 228 return error; 229 } 230 231 int 232 soo_poll(file_t *fp, int events) 233 { 234 235 return sopoll(fp->f_socket, events); 236 } 237 238 int 239 soo_stat(file_t *fp, struct stat *ub) 240 { 241 struct socket *so = fp->f_socket; 242 int error; 243 244 memset(ub, 0, sizeof(*ub)); 245 ub->st_mode = S_IFSOCK; 246 247 solock(so); 248 error = (*so->so_proto->pr_usrreqs->pr_stat)(so, ub); 249 sounlock(so); 250 251 return error; 252 } 253 254 /* ARGSUSED */ 255 int 256 soo_close(file_t *fp) 257 { 258 int error = 0; 259 260 if (fp->f_socket) 261 error = soclose(fp->f_socket); 262 fp->f_socket = NULL; 263 264 return error; 265 } 266 267 void 268 soo_restart(file_t *fp) 269 { 270 271 sorestart(fp->f_socket); 272 } 273 274 static int 275 soo_fpathconf(struct file *fp, int name, register_t *retval) 276 { 277 278 switch (name) { 279 case _PC_PIPE_BUF: 280 *retval = PIPE_BUF; 281 return 0; 282 default: 283 return SET_ERROR(EINVAL); 284 } 285 } 286 287 static int 288 soo_posix_fadvise(struct file *fp, off_t offset, off_t len, int advice) 289 { 290 291 return SET_ERROR(ESPIPE); 292 } 293
Indexes created Thu Sep 25 16:09:42 GMT 2025