1 /* $NetBSD: uipc_syscalls_43.c,v 1.51 2019/01/27 02:08:39 pgoyette 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 1.51 2019/01/27 02:08:39 pgoyette Exp $"); 36 37 #if defined(_KERNEL_OPT) 38 #include "opt_compat_netbsd.h" 39 #endif 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/filedesc.h> 44 #include <sys/kernel.h> 45 #include <sys/proc.h> 46 #include <sys/file.h> 47 #include <sys/socket.h> 48 #include <sys/socketvar.h> 49 #include <sys/stat.h> 50 #include <sys/ioctl.h> 51 #include <sys/fcntl.h> 52 #include <sys/syslog.h> 53 #include <sys/unistd.h> 54 #include <sys/resourcevar.h> 55 #include <sys/mbuf.h> /* for MLEN */ 56 #include <sys/protosw.h> 57 58 #include <sys/mount.h> 59 #include <sys/syscall.h> 60 #include <sys/syscallvar.h> 61 #include <sys/syscallargs.h> 62 63 #include <net/if.h> 64 #include <net/bpf.h> 65 #include <net/route.h> 66 #include <netinet/in.h> 67 #include <netinet/in_systm.h> 68 #include <netinet/ip.h> 69 #include <net/if_gre.h> 70 #include <net/if_tap.h> 71 #include <net80211/ieee80211_ioctl.h> 72 #include <netinet6/in6_var.h> 73 #include <netinet6/nd6.h> 74 #include <compat/sys/socket.h> 75 #include <compat/sys/sockio.h> 76 77 #include <compat/common/compat_util.h> 78 #include <compat/common/compat_mod.h> 79 80 #include <uvm/uvm_extern.h> 81 82 /* 83 * Following 4.3 syscalls were not versioned, even through they should 84 * have been: 85 * connect(2), bind(2), sendto(2) 86 */ 87 88 static struct syscall_package uipc_syscalls_43_syscalls[] = { 89 { SYS_compat_43_oaccept, 0, (sy_call_t *)compat_43_sys_accept }, 90 { SYS_compat_43_ogetpeername, 0, 91 (sy_call_t *)compat_43_sys_getpeername }, 92 { SYS_compat_43_ogetsockname, 0, 93 (sy_call_t *)compat_43_sys_getsockname }, 94 { SYS_compat_43_orecv, 0, (sy_call_t *)compat_43_sys_recv }, 95 { SYS_compat_43_orecvfrom, 0, (sy_call_t *)compat_43_sys_recvfrom }, 96 { SYS_compat_43_orecvmsg, 0, (sy_call_t *)compat_43_sys_recvmsg }, 97 { SYS_compat_43_osend, 0, (sy_call_t *)compat_43_sys_send }, 98 { SYS_compat_43_osendmsg, 0, (sy_call_t *)compat_43_sys_sendmsg }, 99 { 0, 0, NULL } 100 }; 101 102 static int compat_43_sa_put(void *); 103 104 int 105 compat_43_sys_accept(struct lwp *l, const struct compat_43_sys_accept_args *uap, register_t *retval) 106 { 107 /* { 108 syscallarg(int) s; 109 syscallarg(void *) name; 110 syscallarg(int *) anamelen; 111 } */ 112 int error; 113 114 if ((error = sys_accept(l, (const struct sys_accept_args *)uap, retval)) != 0) 115 return error; 116 117 if (SCARG(uap, name) 118 && (error = compat_43_sa_put(SCARG(uap, name)))) 119 return (error); 120 121 return 0; 122 } 123 124 int 125 compat_43_sys_getpeername(struct lwp *l, const struct compat_43_sys_getpeername_args *uap, register_t *retval) 126 { 127 /* { 128 syscallarg(int) fdes; 129 syscallarg(void *) asa; 130 syscallarg(int *) alen; 131 } */ 132 133 int error; 134 135 if ((error = sys_getpeername(l, (const struct sys_getpeername_args *)uap, retval)) != 0) 136 return error; 137 138 if ((error = compat_43_sa_put(SCARG(uap, asa)))) 139 return (error); 140 141 return 0; 142 } 143 144 int 145 compat_43_sys_getsockname(struct lwp *l, const struct compat_43_sys_getsockname_args *uap, register_t *retval) 146 { 147 /* { 148 syscallarg(int) fdes; 149 syscallarg(void *) asa; 150 syscallarg(int *) alen; 151 } */ 152 int error; 153 154 if ((error = sys_getsockname(l, (const struct sys_getsockname_args *)uap, retval)) != 0) 155 return error; 156 157 if ((error = compat_43_sa_put(SCARG(uap, asa)))) 158 return (error); 159 160 return 0; 161 } 162 163 int 164 compat_43_sys_recv(struct lwp *l, const struct compat_43_sys_recv_args *uap, register_t *retval) 165 { 166 /* { 167 syscallarg(int) s; 168 syscallarg(void *) buf; 169 syscallarg(int) len; 170 syscallarg(int) flags; 171 } */ 172 struct sys_recvfrom_args bra; 173 174 SCARG(&bra, s) = SCARG(uap, s); 175 SCARG(&bra, buf) = SCARG(uap, buf); 176 SCARG(&bra, len) = (size_t) SCARG(uap, len); 177 SCARG(&bra, flags) = SCARG(uap, flags); 178 SCARG(&bra, from) = NULL; 179 SCARG(&bra, fromlenaddr) = NULL; 180 181 return (sys_recvfrom(l, &bra, retval)); 182 } 183 184 int 185 compat_43_sys_recvfrom(struct lwp *l, const struct compat_43_sys_recvfrom_args *uap, register_t *retval) 186 { 187 /* { 188 syscallarg(int) s; 189 syscallarg(void *) buf; 190 syscallarg(size_t) len; 191 syscallarg(int) flags; 192 syscallarg(void *) from; 193 syscallarg(int *) fromlenaddr; 194 } */ 195 int error; 196 197 if ((error = sys_recvfrom(l, (const struct sys_recvfrom_args *)uap, retval))) 198 return (error); 199 200 if (SCARG(uap, from) && (error = compat_43_sa_put(SCARG(uap, from)))) 201 return (error); 202 203 return (0); 204 } 205 206 /* 207 * Old recvmsg. Arrange necessary structures, calls generic code and 208 * adjusts results accordingly. 209 */ 210 int 211 compat_43_sys_recvmsg(struct lwp *l, const struct compat_43_sys_recvmsg_args *uap, register_t *retval) 212 { 213 /* { 214 syscallarg(int) s; 215 syscallarg(struct omsghdr *) msg; 216 syscallarg(int) flags; 217 } */ 218 struct omsghdr omsg; 219 struct msghdr msg; 220 struct mbuf *from, *control; 221 int error; 222 223 error = copyin(SCARG(uap, msg), &omsg, sizeof (struct omsghdr)); 224 if (error) 225 return (error); 226 227 if (omsg.msg_accrights == NULL) 228 omsg.msg_accrightslen = 0; 229 /* it was this way in 4.4BSD */ 230 if (omsg.msg_accrightslen > MLEN) 231 return EINVAL; 232 233 msg.msg_name = omsg.msg_name; 234 msg.msg_namelen = omsg.msg_namelen; 235 msg.msg_iovlen = omsg.msg_iovlen; 236 msg.msg_iov = omsg.msg_iov; 237 msg.msg_flags = (SCARG(uap, flags) & MSG_USERFLAGS) | MSG_IOVUSRSPACE; 238 239 error = do_sys_recvmsg(l, SCARG(uap, s), &msg, &from, 240 omsg.msg_accrights != NULL ? &control : NULL, retval); 241 if (error != 0) 242 return error; 243 244 /* 245 * If there is any control information and it's SCM_RIGHTS, 246 * pass it back to the program. 247 * XXX: maybe there can be more than one chunk of control data? 248 */ 249 if (omsg.msg_accrights && control != NULL) { 250 struct cmsghdr *cmsg = mtod(control, struct cmsghdr *); 251 252 if (cmsg->cmsg_level == SOL_SOCKET 253 && cmsg->cmsg_type == SCM_RIGHTS 254 && cmsg->cmsg_len < omsg.msg_accrightslen 255 && copyout(CMSG_DATA(cmsg), omsg.msg_accrights, 256 cmsg->cmsg_len) == 0) { 257 omsg.msg_accrightslen = cmsg->cmsg_len; 258 free_control_mbuf(l, control, control->m_next); 259 } else { 260 omsg.msg_accrightslen = 0; 261 free_control_mbuf(l, control, control); 262 } 263 } else 264 omsg.msg_accrightslen = 0; 265 266 if (from != NULL) 267 /* convert from sockaddr sa_family to osockaddr one here */ 268 mtod(from, struct osockaddr *)->sa_family = 269 mtod(from, struct sockaddr *)->sa_family; 270 271 error = copyout_sockname((struct sockaddr *)omsg.msg_name, &omsg.msg_namelen, 0, from); 272 if (from != NULL) 273 m_free(from); 274 275 if (error != 0) 276 error = copyout(&omsg, SCARG(uap, msg), sizeof(omsg)); 277 278 return error; 279 } 280 281 int 282 compat_43_sys_send(struct lwp *l, const struct compat_43_sys_send_args *uap, register_t *retval) 283 { 284 /* { 285 syscallarg(int) s; 286 syscallarg(void *) buf; 287 syscallarg(int) len; 288 syscallarg(int) flags; 289 } */ 290 struct sys_sendto_args bsa; 291 292 SCARG(&bsa, s) = SCARG(uap, s); 293 SCARG(&bsa, buf) = SCARG(uap, buf); 294 SCARG(&bsa, len) = SCARG(uap, len); 295 SCARG(&bsa, flags) = SCARG(uap, flags); 296 SCARG(&bsa, to) = NULL; 297 SCARG(&bsa, tolen) = 0; 298 299 return (sys_sendto(l, &bsa, retval)); 300 } 301 302 int 303 compat43_set_accrights(struct msghdr *msg, void *accrights, int accrightslen) 304 { 305 struct cmsghdr *cmsg; 306 int error; 307 struct mbuf *ctl; 308 u_int clen; 309 310 if (accrights == NULL || accrightslen == 0) { 311 msg->msg_control = NULL; 312 msg->msg_controllen = 0; 313 return 0; 314 } 315 316 clen = CMSG_SPACE(accrightslen); 317 /* it was (almost) this way in 4.4BSD */ 318 if (accrightslen < 0 || clen > MLEN) 319 return EINVAL; 320 321 ctl = m_get(M_WAIT, MT_CONTROL); 322 ctl->m_len = clen; 323 cmsg = mtod(ctl, struct cmsghdr *); 324 cmsg->cmsg_len = CMSG_SPACE(accrightslen); 325 cmsg->cmsg_level = SOL_SOCKET; 326 cmsg->cmsg_type = SCM_RIGHTS; 327 328 error = copyin(accrights, CMSG_DATA(cmsg), accrightslen); 329 if (error) { 330 m_free(ctl); 331 return error; 332 } 333 334 msg->msg_control = ctl; 335 msg->msg_controllen = clen; 336 msg->msg_flags |= MSG_CONTROLMBUF; 337 return 0; 338 } 339 340 /* 341 * Old sendmsg. Arrange necessary structures, call generic code and 342 * adjust the results accordingly for old code. 343 */ 344 int 345 compat_43_sys_sendmsg(struct lwp *l, const struct compat_43_sys_sendmsg_args *uap, register_t *retval) 346 { 347 /* { 348 syscallarg(int) s; 349 syscallarg(void *) msg; 350 syscallarg(int) flags; 351 } */ 352 struct omsghdr omsg; 353 struct msghdr msg; 354 int error; 355 struct mbuf *nam; 356 struct osockaddr *osa; 357 struct sockaddr *sa; 358 359 error = copyin(SCARG(uap, msg), &omsg, sizeof (struct omsghdr)); 360 if (error != 0) 361 return (error); 362 363 msg.msg_iovlen = omsg.msg_iovlen; 364 msg.msg_iov = omsg.msg_iov; 365 366 error = sockargs(&nam, omsg.msg_name, omsg.msg_namelen, 367 UIO_USERSPACE, MT_SONAME); 368 if (error != 0) 369 return (error); 370 371 sa = mtod(nam, struct sockaddr *); 372 osa = mtod(nam, struct osockaddr *); 373 sa->sa_family = osa->sa_family; 374 sa->sa_len = omsg.msg_namelen; 375 376 msg.msg_flags = MSG_IOVUSRSPACE | MSG_NAMEMBUF; 377 378 msg.msg_name = nam; 379 msg.msg_namelen = omsg.msg_namelen; 380 error = compat43_set_accrights(&msg, omsg.msg_accrights, 381 omsg.msg_accrightslen); 382 if (error != 0) 383 goto bad; 384 385 return do_sys_sendmsg(l, SCARG(uap, s), &msg, SCARG(uap, flags), 386 retval); 387 388 bad: 389 if (nam != NULL) 390 m_free(nam); 391 392 return (error); 393 } 394 395 static int 396 compat_43_sa_put(void *from) 397 { 398 struct osockaddr *osa = (struct osockaddr *) from; 399 struct sockaddr sa; 400 struct osockaddr *kosa; 401 int error, len; 402 403 /* 404 * Only read/write the sockaddr family and length, the rest is 405 * not changed. 406 */ 407 len = sizeof(sa.sa_len) + sizeof(sa.sa_family); 408 409 error = copyin((void *) osa, (void *) &sa, len); 410 if (error) 411 return (error); 412 413 /* Note: we convert from sockaddr sa_family to osockaddr one here */ 414 kosa = (struct osockaddr *) &sa; 415 kosa->sa_family = sa.sa_family; 416 error = copyout(kosa, osa, len); 417 if (error) 418 return (error); 419 420 return (0); 421 } 422 423 int 424 uipc_syscalls_43_init(void) 425 { 426 427 return syscall_establish(NULL, uipc_syscalls_43_syscalls); 428 } 429 430 int 431 uipc_syscalls_43_fini(void) 432 { 433 434 return syscall_disestablish(NULL, uipc_syscalls_43_syscalls); 435 } 436
Indexes created Sat Sep 20 22:09:52 GMT 2025