| 1 | /* $NetBSD: uipc_syscalls_43.c,v 1.47 2016/09/13 07:01:07 martin Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 1982, 1986, 1989, 1990, 1993 |
| 5 | * The Regents of the University of California. All rights reserved. |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * 1. Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * 2. Redistributions in binary form must reproduce the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer in the |
| 14 | * documentation and/or other materials provided with the distribution. |
| 15 | * 3. Neither the name of the University nor the names of its contributors |
| 16 | * may be used to endorse or promote products derived from this software |
| 17 | * without specific prior written permission. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 29 | * SUCH DAMAGE. |
| 30 | * |
| 31 | * @(#)uipc_syscalls.c 8.4 (Berkeley) 2/21/94 |
| 32 | */ |
| 33 | |
| 34 | #include <sys/cdefs.h> |
| 35 | __KERNEL_RCSID(0, "$NetBSD: uipc_syscalls_43.c,v 1.47 2016/09/13 07:01:07 martin Exp $" ); |
| 36 | |
| 37 | #include <sys/param.h> |
| 38 | #include <sys/systm.h> |
| 39 | #include <sys/filedesc.h> |
| 40 | #include <sys/kernel.h> |
| 41 | #include <sys/proc.h> |
| 42 | #include <sys/file.h> |
| 43 | #include <sys/socket.h> |
| 44 | #include <sys/socketvar.h> |
| 45 | #include <sys/stat.h> |
| 46 | #include <sys/ioctl.h> |
| 47 | #include <sys/fcntl.h> |
| 48 | #include <sys/syslog.h> |
| 49 | #include <sys/unistd.h> |
| 50 | #include <sys/resourcevar.h> |
| 51 | #include <sys/mbuf.h> /* for MLEN */ |
| 52 | #include <sys/protosw.h> |
| 53 | |
| 54 | #include <sys/mount.h> |
| 55 | #include <sys/syscallargs.h> |
| 56 | |
| 57 | #include <net/if.h> |
| 58 | #include <net/bpf.h> |
| 59 | #include <net/route.h> |
| 60 | #include <netinet/in.h> |
| 61 | #include <netinet/in_systm.h> |
| 62 | #include <netinet/ip.h> |
| 63 | #include <net/if_gre.h> |
| 64 | #include <net/if_atm.h> |
| 65 | #include <net/if_tap.h> |
| 66 | #include <net80211/ieee80211_ioctl.h> |
| 67 | #include <netinet6/in6_var.h> |
| 68 | #include <netinet6/nd6.h> |
| 69 | #include <compat/sys/socket.h> |
| 70 | #include <compat/sys/sockio.h> |
| 71 | |
| 72 | #include <compat/common/compat_util.h> |
| 73 | |
| 74 | #include <uvm/uvm_extern.h> |
| 75 | |
| 76 | /* |
| 77 | * Following 4.3 syscalls were not versioned, even through they should |
| 78 | * have been: |
| 79 | * connect(2), bind(2), sendto(2) |
| 80 | */ |
| 81 | |
| 82 | static int compat_43_sa_put(void *); |
| 83 | |
| 84 | int |
| 85 | compat_43_sys_accept(struct lwp *l, const struct compat_43_sys_accept_args *uap, register_t *retval) |
| 86 | { |
| 87 | /* { |
| 88 | syscallarg(int) s; |
| 89 | syscallarg(void *) name; |
| 90 | syscallarg(int *) anamelen; |
| 91 | } */ |
| 92 | int error; |
| 93 | |
| 94 | if ((error = sys_accept(l, (const struct sys_accept_args *)uap, retval)) != 0) |
| 95 | return error; |
| 96 | |
| 97 | if (SCARG(uap, name) |
| 98 | && (error = compat_43_sa_put(SCARG(uap, name)))) |
| 99 | return (error); |
| 100 | |
| 101 | return 0; |
| 102 | } |
| 103 | |
| 104 | int |
| 105 | compat_43_sys_getpeername(struct lwp *l, const struct compat_43_sys_getpeername_args *uap, register_t *retval) |
| 106 | { |
| 107 | /* { |
| 108 | syscallarg(int) fdes; |
| 109 | syscallarg(void *) asa; |
| 110 | syscallarg(int *) alen; |
| 111 | } */ |
| 112 | |
| 113 | int error; |
| 114 | |
| 115 | if ((error = sys_getpeername(l, (const struct sys_getpeername_args *)uap, retval)) != 0) |
| 116 | return error; |
| 117 | |
| 118 | if ((error = compat_43_sa_put(SCARG(uap, asa)))) |
| 119 | return (error); |
| 120 | |
| 121 | return 0; |
| 122 | } |
| 123 | |
| 124 | int |
| 125 | compat_43_sys_getsockname(struct lwp *l, const struct compat_43_sys_getsockname_args *uap, register_t *retval) |
| 126 | { |
| 127 | /* { |
| 128 | syscallarg(int) fdes; |
| 129 | syscallarg(void *) asa; |
| 130 | syscallarg(int *) alen; |
| 131 | } */ |
| 132 | int error; |
| 133 | |
| 134 | if ((error = sys_getsockname(l, (const struct sys_getsockname_args *)uap, retval)) != 0) |
| 135 | return error; |
| 136 | |
| 137 | if ((error = compat_43_sa_put(SCARG(uap, asa)))) |
| 138 | return (error); |
| 139 | |
| 140 | return 0; |
| 141 | } |
| 142 | |
| 143 | int |
| 144 | compat_43_sys_recv(struct lwp *l, const struct compat_43_sys_recv_args *uap, register_t *retval) |
| 145 | { |
| 146 | /* { |
| 147 | syscallarg(int) s; |
| 148 | syscallarg(void *) buf; |
| 149 | syscallarg(int) len; |
| 150 | syscallarg(int) flags; |
| 151 | } */ |
| 152 | struct sys_recvfrom_args bra; |
| 153 | |
| 154 | SCARG(&bra, s) = SCARG(uap, s); |
| 155 | SCARG(&bra, buf) = SCARG(uap, buf); |
| 156 | SCARG(&bra, len) = (size_t) SCARG(uap, len); |
| 157 | SCARG(&bra, flags) = SCARG(uap, flags); |
| 158 | SCARG(&bra, from) = NULL; |
| 159 | SCARG(&bra, fromlenaddr) = NULL; |
| 160 | |
| 161 | return (sys_recvfrom(l, &bra, retval)); |
| 162 | } |
| 163 | |
| 164 | int |
| 165 | compat_43_sys_recvfrom(struct lwp *l, const struct compat_43_sys_recvfrom_args *uap, register_t *retval) |
| 166 | { |
| 167 | /* { |
| 168 | syscallarg(int) s; |
| 169 | syscallarg(void *) buf; |
| 170 | syscallarg(size_t) len; |
| 171 | syscallarg(int) flags; |
| 172 | syscallarg(void *) from; |
| 173 | syscallarg(int *) fromlenaddr; |
| 174 | } */ |
| 175 | int error; |
| 176 | |
| 177 | if ((error = sys_recvfrom(l, (const struct sys_recvfrom_args *)uap, retval))) |
| 178 | return (error); |
| 179 | |
| 180 | if (SCARG(uap, from) && (error = compat_43_sa_put(SCARG(uap, from)))) |
| 181 | return (error); |
| 182 | |
| 183 | return (0); |
| 184 | } |
| 185 | |
| 186 | /* |
| 187 | * Old recvmsg. Arrange necessary structures, calls generic code and |
| 188 | * adjusts results accordingly. |
| 189 | */ |
| 190 | int |
| 191 | compat_43_sys_recvmsg(struct lwp *l, const struct compat_43_sys_recvmsg_args *uap, register_t *retval) |
| 192 | { |
| 193 | /* { |
| 194 | syscallarg(int) s; |
| 195 | syscallarg(struct omsghdr *) msg; |
| 196 | syscallarg(int) flags; |
| 197 | } */ |
| 198 | struct omsghdr omsg; |
| 199 | struct msghdr msg; |
| 200 | struct mbuf *from, *control; |
| 201 | int error; |
| 202 | |
| 203 | error = copyin(SCARG(uap, msg), &omsg, sizeof (struct omsghdr)); |
| 204 | if (error) |
| 205 | return (error); |
| 206 | |
| 207 | if (omsg.msg_accrights == NULL) |
| 208 | omsg.msg_accrightslen = 0; |
| 209 | /* it was this way in 4.4BSD */ |
| 210 | if (omsg.msg_accrightslen > MLEN) |
| 211 | return EINVAL; |
| 212 | |
| 213 | msg.msg_name = omsg.msg_name; |
| 214 | msg.msg_namelen = omsg.msg_namelen; |
| 215 | msg.msg_iovlen = omsg.msg_iovlen; |
| 216 | msg.msg_iov = omsg.msg_iov; |
| 217 | msg.msg_flags = (SCARG(uap, flags) & MSG_USERFLAGS) | MSG_IOVUSRSPACE; |
| 218 | |
| 219 | error = do_sys_recvmsg(l, SCARG(uap, s), &msg, NULL, 0, &from, |
| 220 | omsg.msg_accrights != NULL ? &control : NULL, retval); |
| 221 | if (error != 0) |
| 222 | return error; |
| 223 | |
| 224 | /* |
| 225 | * If there is any control information and it's SCM_RIGHTS, |
| 226 | * pass it back to the program. |
| 227 | * XXX: maybe there can be more than one chunk of control data? |
| 228 | */ |
| 229 | if (omsg.msg_accrights && control != NULL) { |
| 230 | struct cmsghdr *cmsg = mtod(control, struct cmsghdr *); |
| 231 | |
| 232 | if (cmsg->cmsg_level == SOL_SOCKET |
| 233 | && cmsg->cmsg_type == SCM_RIGHTS |
| 234 | && cmsg->cmsg_len < omsg.msg_accrightslen |
| 235 | && copyout(CMSG_DATA(cmsg), omsg.msg_accrights, |
| 236 | cmsg->cmsg_len) == 0) { |
| 237 | omsg.msg_accrightslen = cmsg->cmsg_len; |
| 238 | free_control_mbuf(l, control, control->m_next); |
| 239 | } else { |
| 240 | omsg.msg_accrightslen = 0; |
| 241 | free_control_mbuf(l, control, control); |
| 242 | } |
| 243 | } else |
| 244 | omsg.msg_accrightslen = 0; |
| 245 | |
| 246 | if (from != NULL) |
| 247 | /* convert from sockaddr sa_family to osockaddr one here */ |
| 248 | mtod(from, struct osockaddr *)->sa_family = |
| 249 | mtod(from, struct sockaddr *)->sa_family; |
| 250 | |
| 251 | error = copyout_sockname((struct sockaddr *)omsg.msg_name, &omsg.msg_namelen, 0, from); |
| 252 | if (from != NULL) |
| 253 | m_free(from); |
| 254 | |
| 255 | if (error != 0) |
| 256 | error = copyout(&omsg, SCARG(uap, msg), sizeof(omsg)); |
| 257 | |
| 258 | return error; |
| 259 | } |
| 260 | |
| 261 | int |
| 262 | compat_43_sys_send(struct lwp *l, const struct compat_43_sys_send_args *uap, register_t *retval) |
| 263 | { |
| 264 | /* { |
| 265 | syscallarg(int) s; |
| 266 | syscallarg(void *) buf; |
| 267 | syscallarg(int) len; |
| 268 | syscallarg(int) flags; |
| 269 | } */ |
| 270 | struct sys_sendto_args bsa; |
| 271 | |
| 272 | SCARG(&bsa, s) = SCARG(uap, s); |
| 273 | SCARG(&bsa, buf) = SCARG(uap, buf); |
| 274 | SCARG(&bsa, len) = SCARG(uap, len); |
| 275 | SCARG(&bsa, flags) = SCARG(uap, flags); |
| 276 | SCARG(&bsa, to) = NULL; |
| 277 | SCARG(&bsa, tolen) = 0; |
| 278 | |
| 279 | return (sys_sendto(l, &bsa, retval)); |
| 280 | } |
| 281 | |
| 282 | int |
| 283 | compat43_set_accrights(struct msghdr *msg, void *accrights, int accrightslen) |
| 284 | { |
| 285 | struct cmsghdr *cmsg; |
| 286 | int error; |
| 287 | struct mbuf *ctl; |
| 288 | u_int clen; |
| 289 | |
| 290 | if (accrights == NULL || accrightslen == 0) { |
| 291 | msg->msg_control = NULL; |
| 292 | msg->msg_controllen = 0; |
| 293 | return 0; |
| 294 | } |
| 295 | |
| 296 | clen = CMSG_SPACE(accrightslen); |
| 297 | /* it was (almost) this way in 4.4BSD */ |
| 298 | if (accrightslen < 0 || clen > MLEN) |
| 299 | return EINVAL; |
| 300 | |
| 301 | ctl = m_get(M_WAIT, MT_CONTROL); |
| 302 | ctl->m_len = clen; |
| 303 | cmsg = mtod(ctl, struct cmsghdr *); |
| 304 | cmsg->cmsg_len = CMSG_SPACE(accrightslen); |
| 305 | cmsg->cmsg_level = SOL_SOCKET; |
| 306 | cmsg->cmsg_type = SCM_RIGHTS; |
| 307 | |
| 308 | error = copyin(accrights, CMSG_DATA(cmsg), accrightslen); |
| 309 | if (error) { |
| 310 | m_free(ctl); |
| 311 | return error; |
| 312 | } |
| 313 | |
| 314 | msg->msg_control = ctl; |
| 315 | msg->msg_controllen = clen; |
| 316 | msg->msg_flags |= MSG_CONTROLMBUF; |
| 317 | return 0; |
| 318 | } |
| 319 | |
| 320 | /* |
| 321 | * Old sendmsg. Arrange necessary structures, call generic code and |
| 322 | * adjust the results accordingly for old code. |
| 323 | */ |
| 324 | int |
| 325 | compat_43_sys_sendmsg(struct lwp *l, const struct compat_43_sys_sendmsg_args *uap, register_t *retval) |
| 326 | { |
| 327 | /* { |
| 328 | syscallarg(int) s; |
| 329 | syscallarg(void *) msg; |
| 330 | syscallarg(int) flags; |
| 331 | } */ |
| 332 | struct omsghdr omsg; |
| 333 | struct msghdr msg; |
| 334 | int error; |
| 335 | struct mbuf *nam; |
| 336 | struct osockaddr *osa; |
| 337 | struct sockaddr *sa; |
| 338 | |
| 339 | error = copyin(SCARG(uap, msg), &omsg, sizeof (struct omsghdr)); |
| 340 | if (error != 0) |
| 341 | return (error); |
| 342 | |
| 343 | msg.msg_iovlen = omsg.msg_iovlen; |
| 344 | msg.msg_iov = omsg.msg_iov; |
| 345 | |
| 346 | error = sockargs(&nam, omsg.msg_name, omsg.msg_namelen, MT_SONAME); |
| 347 | if (error != 0) |
| 348 | return (error); |
| 349 | |
| 350 | sa = mtod(nam, struct sockaddr *); |
| 351 | osa = mtod(nam, struct osockaddr *); |
| 352 | sa->sa_family = osa->sa_family; |
| 353 | sa->sa_len = omsg.msg_namelen; |
| 354 | |
| 355 | msg.msg_flags = MSG_IOVUSRSPACE | MSG_NAMEMBUF; |
| 356 | |
| 357 | msg.msg_name = nam; |
| 358 | msg.msg_namelen = omsg.msg_namelen; |
| 359 | error = compat43_set_accrights(&msg, omsg.msg_accrights, |
| 360 | omsg.msg_accrightslen); |
| 361 | if (error != 0) |
| 362 | goto bad; |
| 363 | |
| 364 | return do_sys_sendmsg(l, SCARG(uap, s), &msg, SCARG(uap, flags), |
| 365 | NULL, 0, retval); |
| 366 | |
| 367 | bad: |
| 368 | if (nam != NULL) |
| 369 | m_free(nam); |
| 370 | |
| 371 | return (error); |
| 372 | } |
| 373 | |
| 374 | static int |
| 375 | compat_43_sa_put(void *from) |
| 376 | { |
| 377 | struct osockaddr *osa = (struct osockaddr *) from; |
| 378 | struct sockaddr sa; |
| 379 | struct osockaddr *kosa; |
| 380 | int error, len; |
| 381 | |
| 382 | /* |
| 383 | * Only read/write the sockaddr family and length, the rest is |
| 384 | * not changed. |
| 385 | */ |
| 386 | len = sizeof(sa.sa_len) + sizeof(sa.sa_family); |
| 387 | |
| 388 | error = copyin((void *) osa, (void *) &sa, len); |
| 389 | if (error) |
| 390 | return (error); |
| 391 | |
| 392 | /* Note: we convert from sockaddr sa_family to osockaddr one here */ |
| 393 | kosa = (struct osockaddr *) &sa; |
| 394 | kosa->sa_family = sa.sa_family; |
| 395 | error = copyout(kosa, osa, len); |
| 396 | if (error) |
| 397 | return (error); |
| 398 | |
| 399 | return (0); |
| 400 | } |
| 401 | |