| 1 | /* $NetBSD: sys_socket.c,v 1.74 2016/07/07 06:55:43 msaitoh 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 1.74 2016/07/07 06:55:43 msaitoh 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 | int (*ifioctl)(struct socket *, u_long, void *, struct lwp *) = (void *)eopnotsupp; |
| 96 | |
| 97 | /* ARGSUSED */ |
| 98 | int |
| 99 | soo_read(file_t *fp, off_t *offset, struct uio *uio, kauth_cred_t cred, |
| 100 | int flags) |
| 101 | { |
| 102 | struct socket *so = fp->f_socket; |
| 103 | int error; |
| 104 | |
| 105 | error = (*so->so_receive)(so, NULL, uio, NULL, NULL, NULL); |
| 106 | |
| 107 | return error; |
| 108 | } |
| 109 | |
| 110 | /* ARGSUSED */ |
| 111 | int |
| 112 | soo_write(file_t *fp, off_t *offset, struct uio *uio, kauth_cred_t cred, |
| 113 | int flags) |
| 114 | { |
| 115 | struct socket *so = fp->f_socket; |
| 116 | int error; |
| 117 | |
| 118 | error = (*so->so_send)(so, NULL, uio, NULL, NULL, 0, curlwp); |
| 119 | |
| 120 | return error; |
| 121 | } |
| 122 | |
| 123 | int |
| 124 | soo_ioctl(file_t *fp, u_long cmd, void *data) |
| 125 | { |
| 126 | struct socket *so = fp->f_socket; |
| 127 | int error = 0; |
| 128 | |
| 129 | switch (cmd) { |
| 130 | |
| 131 | case FIONBIO: |
| 132 | solock(so); |
| 133 | if (*(int *)data) |
| 134 | so->so_state |= SS_NBIO; |
| 135 | else |
| 136 | so->so_state &= ~SS_NBIO; |
| 137 | sounlock(so); |
| 138 | break; |
| 139 | |
| 140 | case FIOASYNC: |
| 141 | solock(so); |
| 142 | if (*(int *)data) { |
| 143 | so->so_state |= SS_ASYNC; |
| 144 | so->so_rcv.sb_flags |= SB_ASYNC; |
| 145 | so->so_snd.sb_flags |= SB_ASYNC; |
| 146 | } else { |
| 147 | so->so_state &= ~SS_ASYNC; |
| 148 | so->so_rcv.sb_flags &= ~SB_ASYNC; |
| 149 | so->so_snd.sb_flags &= ~SB_ASYNC; |
| 150 | } |
| 151 | sounlock(so); |
| 152 | break; |
| 153 | |
| 154 | case FIONREAD: |
| 155 | *(int *)data = so->so_rcv.sb_cc; |
| 156 | break; |
| 157 | |
| 158 | case FIONWRITE: |
| 159 | *(int *)data = so->so_snd.sb_cc; |
| 160 | break; |
| 161 | |
| 162 | case FIONSPACE: |
| 163 | /* |
| 164 | * See the comment around sbspace()'s definition |
| 165 | * in sys/socketvar.h in face of counts about maximum |
| 166 | * to understand the following test. We detect overflow |
| 167 | * and return zero. |
| 168 | */ |
| 169 | solock(so); |
| 170 | if ((so->so_snd.sb_hiwat < so->so_snd.sb_cc) |
| 171 | || (so->so_snd.sb_mbmax < so->so_snd.sb_mbcnt)) |
| 172 | *(int *)data = 0; |
| 173 | else |
| 174 | *(int *)data = sbspace(&so->so_snd); |
| 175 | sounlock(so); |
| 176 | break; |
| 177 | |
| 178 | case SIOCSPGRP: |
| 179 | case FIOSETOWN: |
| 180 | case TIOCSPGRP: |
| 181 | error = fsetown(&so->so_pgid, cmd, data); |
| 182 | break; |
| 183 | |
| 184 | case SIOCGPGRP: |
| 185 | case FIOGETOWN: |
| 186 | case TIOCGPGRP: |
| 187 | error = fgetown(so->so_pgid, cmd, data); |
| 188 | break; |
| 189 | |
| 190 | case SIOCATMARK: |
| 191 | *(int *)data = (so->so_state&SS_RCVATMARK) != 0; |
| 192 | break; |
| 193 | |
| 194 | default: |
| 195 | /* |
| 196 | * Interface/routing/protocol specific ioctls: |
| 197 | * interface and routing ioctls should have a |
| 198 | * different entry since a socket's unnecessary |
| 199 | */ |
| 200 | KERNEL_LOCK(1, NULL); |
| 201 | if (IOCGROUP(cmd) == 'i') |
| 202 | error = ifioctl(so, cmd, data, curlwp); |
| 203 | else { |
| 204 | error = (*so->so_proto->pr_usrreqs->pr_ioctl)(so, |
| 205 | cmd, data, NULL); |
| 206 | } |
| 207 | KERNEL_UNLOCK_ONE(NULL); |
| 208 | break; |
| 209 | } |
| 210 | |
| 211 | |
| 212 | return error; |
| 213 | } |
| 214 | |
| 215 | int |
| 216 | soo_fcntl(file_t *fp, u_int cmd, void *data) |
| 217 | { |
| 218 | |
| 219 | if (cmd == F_SETFL) |
| 220 | return 0; |
| 221 | else |
| 222 | return EOPNOTSUPP; |
| 223 | } |
| 224 | |
| 225 | int |
| 226 | soo_poll(file_t *fp, int events) |
| 227 | { |
| 228 | |
| 229 | return sopoll(fp->f_socket, events); |
| 230 | } |
| 231 | |
| 232 | int |
| 233 | soo_stat(file_t *fp, struct stat *ub) |
| 234 | { |
| 235 | struct socket *so = fp->f_socket; |
| 236 | int error; |
| 237 | |
| 238 | memset(ub, 0, sizeof(*ub)); |
| 239 | ub->st_mode = S_IFSOCK; |
| 240 | |
| 241 | solock(so); |
| 242 | error = (*so->so_proto->pr_usrreqs->pr_stat)(so, ub); |
| 243 | sounlock(so); |
| 244 | |
| 245 | return error; |
| 246 | } |
| 247 | |
| 248 | /* ARGSUSED */ |
| 249 | int |
| 250 | soo_close(file_t *fp) |
| 251 | { |
| 252 | int error = 0; |
| 253 | |
| 254 | if (fp->f_socket) |
| 255 | error = soclose(fp->f_socket); |
| 256 | fp->f_socket = NULL; |
| 257 | |
| 258 | return error; |
| 259 | } |
| 260 | |
| 261 | void |
| 262 | soo_restart(file_t *fp) |
| 263 | { |
| 264 | |
| 265 | sorestart(fp->f_socket); |
| 266 | } |
| 267 | |