1 /* $NetBSD: uipc_syscalls_43.c,v 1.53 2026/09/20 13:45:00 riastradh 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 1.53 2026/09/20 13:45:00 riastradh 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 memset(&bra, 0, sizeof(bra)); 175 SCARG(&bra, s) = SCARG(uap, s); 176 SCARG(&bra, buf) = SCARG(uap, buf); 177 SCARG(&bra, len) = (size_t) SCARG(uap, len); 178 SCARG(&bra, flags) = SCARG(uap, flags); 179 SCARG(&bra, from) = NULL; 180 SCARG(&bra, fromlenaddr) = NULL; 181 182 return (sys_recvfrom(l, &bra, retval)); 183 } 184 185 int 186 compat_43_sys_recvfrom(struct lwp *l, const struct compat_43_sys_recvfrom_args *uap, register_t *retval) 187 { 188 /* { 189 syscallarg(int) s; 190 syscallarg(void *) buf; 191 syscallarg(size_t) len; 192 syscallarg(int) flags; 193 syscallarg(void *) from; 194 syscallarg(int *) fromlenaddr; 195 } */ 196 int error; 197 198 if ((error = sys_recvfrom(l, (const struct sys_recvfrom_args *)uap, retval))) 199 return (error); 200 201 if (SCARG(uap, from) && (error = compat_43_sa_put(SCARG(uap, from)))) 202 return (error); 203 204 return (0); 205 } 206 207 /* 208 * Old recvmsg. Arrange necessary structures, calls generic code and 209 * adjusts results accordingly. 210 */ 211 int 212 compat_43_sys_recvmsg(struct lwp *l, const struct compat_43_sys_recvmsg_args *uap, register_t *retval) 213 { 214 /* { 215 syscallarg(int) s; 216 syscallarg(struct omsghdr *) msg; 217 syscallarg(int) flags; 218 } */ 219 struct omsghdr omsg; 220 struct msghdr msg; 221 struct mbuf *from, *control; 222 int error; 223 224 error = copyin(SCARG(uap, msg), &omsg, sizeof (struct omsghdr)); 225 if (error) 226 return (error); 227 228 if (omsg.msg_accrights == NULL) 229 omsg.msg_accrightslen = 0; 230 /* it was this way in 4.4BSD */ 231 if (omsg.msg_accrightslen > MLEN) 232 return EINVAL; 233 234 msg.msg_name = omsg.msg_name; 235 msg.msg_namelen = omsg.msg_namelen; 236 msg.msg_iovlen = omsg.msg_iovlen; 237 msg.msg_iov = omsg.msg_iov; 238 msg.msg_flags = (SCARG(uap, flags) & MSG_USERFLAGS) | MSG_IOVUSRSPACE; 239 240 error = do_sys_recvmsg(l, SCARG(uap, s), &msg, &from, 241 omsg.msg_accrights != NULL ? &control : NULL, retval); 242 if (error != 0) 243 return error; 244 245 /* 246 * If there is any control information and it's SCM_RIGHTS, 247 * pass it back to the program. 248 * XXX: maybe there can be more than one chunk of control data? 249 */ 250 if (omsg.msg_accrights && control != NULL) { 251 struct cmsghdr *cmsg = mtod(control, struct cmsghdr *); 252 253 if (cmsg->cmsg_level == SOL_SOCKET 254 && cmsg->cmsg_type == SCM_RIGHTS 255 && cmsg->cmsg_len < omsg.msg_accrightslen 256 && copyout(CMSG_DATA(cmsg), omsg.msg_accrights, 257 cmsg->cmsg_len) == 0) { 258 omsg.msg_accrightslen = cmsg->cmsg_len; 259 free_control_mbuf(l, control, control->m_next); 260 } else { 261 omsg.msg_accrightslen = 0; 262 free_control_mbuf(l, control, control); 263 } 264 } else 265 omsg.msg_accrightslen = 0; 266 267 if (from != NULL) 268 /* convert from sockaddr sa_family to osockaddr one here */ 269 mtod(from, struct osockaddr *)->sa_family = 270 mtod(from, struct sockaddr *)->sa_family; 271 272 error = copyout_sockname((struct sockaddr *)omsg.msg_name, &omsg.msg_namelen, 0, from); 273 if (from != NULL) 274 m_free(from); 275 276 if (error != 0) 277 return error; 278 return copyout(&omsg, SCARG(uap, msg), sizeof(omsg)); 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 memset(&bsa, 0, sizeof(bsa)); 293 SCARG(&bsa, s) = SCARG(uap, s); 294 SCARG(&bsa, buf) = SCARG(uap, buf); 295 SCARG(&bsa, len) = SCARG(uap, len); 296 SCARG(&bsa, flags) = SCARG(uap, flags); 297 SCARG(&bsa, to) = NULL; 298 SCARG(&bsa, tolen) = 0; 299 300 return (sys_sendto(l, &bsa, retval)); 301 } 302 303 int 304 compat43_set_accrights(struct msghdr *msg, void *accrights, int accrightslen) 305 { 306 struct cmsghdr *cmsg; 307 int error; 308 struct mbuf *ctl; 309 u_int clen; 310 311 if (accrights == NULL || accrightslen == 0) { 312 msg->msg_control = NULL; 313 msg->msg_controllen = 0; 314 return 0; 315 } 316 317 clen = CMSG_SPACE(accrightslen); 318 /* it was (almost) this way in 4.4BSD */ 319 if (accrightslen < 0 || clen > MLEN) 320 return EINVAL; 321 322 ctl = m_get(M_WAIT, MT_CONTROL); 323 ctl->m_len = clen; 324 cmsg = mtod(ctl, struct cmsghdr *); 325 cmsg->cmsg_len = CMSG_SPACE(accrightslen); 326 cmsg->cmsg_level = SOL_SOCKET; 327 cmsg->cmsg_type = SCM_RIGHTS; 328 329 error = copyin(accrights, CMSG_DATA(cmsg), accrightslen); 330 if (error) { 331 m_free(ctl); 332 return error; 333 } 334 335 msg->msg_control = ctl; 336 msg->msg_controllen = clen; 337 msg->msg_flags |= MSG_CONTROLMBUF; 338 return 0; 339 } 340 341 /* 342 * Old sendmsg. Arrange necessary structures, call generic code and 343 * adjust the results accordingly for old code. 344 */ 345 int 346 compat_43_sys_sendmsg(struct lwp *l, const struct compat_43_sys_sendmsg_args *uap, register_t *retval) 347 { 348 /* { 349 syscallarg(int) s; 350 syscallarg(void *) msg; 351 syscallarg(int) flags; 352 } */ 353 struct omsghdr omsg; 354 struct msghdr msg; 355 int error; 356 struct mbuf *nam; 357 struct osockaddr *osa; 358 struct sockaddr *sa; 359 360 error = copyin(SCARG(uap, msg), &omsg, sizeof (struct omsghdr)); 361 if (error != 0) 362 return (error); 363 364 msg.msg_iovlen = omsg.msg_iovlen; 365 msg.msg_iov = omsg.msg_iov; 366 367 error = sockargs(&nam, omsg.msg_name, omsg.msg_namelen, 368 UIO_USERSPACE, MT_SONAME); 369 if (error != 0) 370 return (error); 371 372 sa = mtod(nam, struct sockaddr *); 373 osa = mtod(nam, struct osockaddr *); 374 sa->sa_family = osa->sa_family; 375 sa->sa_len = omsg.msg_namelen; 376 377 msg.msg_flags = MSG_IOVUSRSPACE | MSG_NAMEMBUF; 378 379 msg.msg_name = nam; 380 msg.msg_namelen = omsg.msg_namelen; 381 error = compat43_set_accrights(&msg, omsg.msg_accrights, 382 omsg.msg_accrightslen); 383 if (error != 0) 384 goto bad; 385 386 return do_sys_sendmsg(l, SCARG(uap, s), &msg, SCARG(uap, flags), 387 retval); 388 389 bad: 390 if (nam != NULL) 391 m_free(nam); 392 393 return (error); 394 } 395 396 static int 397 compat_43_sa_put(void *from) 398 { 399 struct osockaddr *osa = (struct osockaddr *) from; 400 struct sockaddr sa; 401 struct osockaddr *kosa; 402 int error, len; 403 404 /* 405 * Only read/write the sockaddr family and length, the rest is 406 * not changed. 407 */ 408 len = sizeof(sa.sa_len) + sizeof(sa.sa_family); 409 410 error = copyin((void *) osa, (void *) &sa, len); 411 if (error) 412 return (error); 413 414 /* Note: we convert from sockaddr sa_family to osockaddr one here */ 415 kosa = (struct osockaddr *) &sa; 416 kosa->sa_family = sa.sa_family; 417 error = copyout(kosa, osa, len); 418 if (error) 419 return (error); 420 421 return (0); 422 } 423 424 int 425 uipc_syscalls_43_init(void) 426 { 427 428 return syscall_establish(NULL, uipc_syscalls_43_syscalls); 429 } 430 431 int 432 uipc_syscalls_43_fini(void) 433 { 434 435 return syscall_disestablish(NULL, uipc_syscalls_43_syscalls); 436 } 437
Indexes created Wed Oct 07 00:25:59 UTC 2026