1 /* $NetBSD: sys_socket.c,v 1.81 2023/04/22 13:53:02 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 1.81 2023/04/22 13:53:02 riastradh 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 static int soo_fpathconf(struct file *, int, register_t *); 84 static int soo_posix_fadvise(struct file *, off_t, off_t, int); 85 86 const struct fileops socketops = { 87 .fo_name = "socket", 88 .fo_read = soo_read, 89 .fo_write = soo_write, 90 .fo_ioctl = soo_ioctl, 91 .fo_fcntl = fnullop_fcntl, 92 .fo_poll = soo_poll, 93 .fo_stat = soo_stat, 94 .fo_close = soo_close, 95 .fo_kqfilter = soo_kqfilter, 96 .fo_restart = soo_restart, 97 .fo_fpathconf = soo_fpathconf, 98 .fo_posix_fadvise = soo_posix_fadvise, 99 }; 100 101 int (*ifioctl)(struct socket *, u_long, void *, struct lwp *) = (void *)eopnotsupp; 102 103 /* ARGSUSED */ 104 int 105 soo_read(file_t *fp, off_t *offset, struct uio *uio, kauth_cred_t cred, 106 int flags) 107 { 108 struct socket *so = fp->f_socket; 109 int error; 110 111 error = (*so->so_receive)(so, NULL, uio, NULL, NULL, NULL); 112 113 return error; 114 } 115 116 /* ARGSUSED */ 117 int 118 soo_write(file_t *fp, off_t *offset, struct uio *uio, kauth_cred_t cred, 119 int flags) 120 { 121 struct socket *so = fp->f_socket; 122 int error; 123 124 error = (*so->so_send)(so, NULL, uio, NULL, NULL, 0, curlwp); 125 126 return error; 127 } 128 129 int 130 soo_ioctl(file_t *fp, u_long cmd, void *data) 131 { 132 struct socket *so = fp->f_socket; 133 int error = 0; 134 135 switch (cmd) { 136 137 case FIONBIO: 138 solock(so); 139 if (*(int *)data) 140 so->so_state |= SS_NBIO; 141 else 142 so->so_state &= ~SS_NBIO; 143 sounlock(so); 144 break; 145 146 case FIOASYNC: 147 solock(so); 148 if (*(int *)data) { 149 so->so_rcv.sb_flags |= SB_ASYNC; 150 so->so_snd.sb_flags |= SB_ASYNC; 151 } else { 152 so->so_rcv.sb_flags &= ~SB_ASYNC; 153 so->so_snd.sb_flags &= ~SB_ASYNC; 154 } 155 sounlock(so); 156 break; 157 158 case FIONREAD: 159 *(int *)data = so->so_rcv.sb_cc; 160 break; 161 162 case FIONWRITE: 163 *(int *)data = so->so_snd.sb_cc; 164 break; 165 166 case FIONSPACE: 167 /* 168 * See the comment around sbspace()'s definition 169 * in sys/socketvar.h in face of counts about maximum 170 * to understand the following test. We detect overflow 171 * and return zero. 172 */ 173 solock(so); 174 if ((so->so_snd.sb_hiwat < so->so_snd.sb_cc) 175 || (so->so_snd.sb_mbmax < so->so_snd.sb_mbcnt)) 176 *(int *)data = 0; 177 else 178 *(int *)data = sbspace(&so->so_snd); 179 sounlock(so); 180 break; 181 182 case SIOCSPGRP: 183 case FIOSETOWN: 184 case TIOCSPGRP: 185 error = fsetown(&so->so_pgid, cmd, data); 186 break; 187 188 case SIOCGPGRP: 189 case FIOGETOWN: 190 case TIOCGPGRP: 191 error = fgetown(so->so_pgid, cmd, data); 192 break; 193 194 case SIOCATMARK: 195 *(int *)data = (so->so_state&SS_RCVATMARK) != 0; 196 break; 197 198 case SIOCPEELOFF: 199 solock(so); 200 error = do_sys_peeloff(so, data); 201 sounlock(so); 202 break; 203 204 default: 205 /* 206 * Interface/routing/protocol specific ioctls: 207 * interface and routing ioctls should have a 208 * different entry since a socket's unnecessary 209 */ 210 if (IOCGROUP(cmd) == 'i') 211 /* 212 * KERNEL_LOCK will be held later if if_ioctl() of the 213 * interface isn't MP-safe. 214 */ 215 error = ifioctl(so, cmd, data, curlwp); 216 else { 217 KERNEL_LOCK(1, NULL); 218 error = (*so->so_proto->pr_usrreqs->pr_ioctl)(so, 219 cmd, data, NULL); 220 KERNEL_UNLOCK_ONE(NULL); 221 } 222 break; 223 } 224 225 226 return error; 227 } 228 229 int 230 soo_poll(file_t *fp, int events) 231 { 232 233 return sopoll(fp->f_socket, events); 234 } 235 236 int 237 soo_stat(file_t *fp, struct stat *ub) 238 { 239 struct socket *so = fp->f_socket; 240 int error; 241 242 memset(ub, 0, sizeof(*ub)); 243 ub->st_mode = S_IFSOCK; 244 245 solock(so); 246 error = (*so->so_proto->pr_usrreqs->pr_stat)(so, ub); 247 sounlock(so); 248 249 return error; 250 } 251 252 /* ARGSUSED */ 253 int 254 soo_close(file_t *fp) 255 { 256 int error = 0; 257 258 if (fp->f_socket) 259 error = soclose(fp->f_socket); 260 fp->f_socket = NULL; 261 262 return error; 263 } 264 265 void 266 soo_restart(file_t *fp) 267 { 268 269 sorestart(fp->f_socket); 270 } 271 272 static int 273 soo_fpathconf(struct file *fp, int name, register_t *retval) 274 { 275 276 switch (name) { 277 case _PC_PIPE_BUF: 278 *retval = PIPE_BUF; 279 return 0; 280 default: 281 return EINVAL; 282 } 283 } 284 285 static int 286 soo_posix_fadvise(struct file *fp, off_t offset, off_t len, int advice) 287 { 288 289 return ESPIPE; 290 } 291