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
compat_43_sys_accept(struct lwp * l,const struct compat_43_sys_accept_args * uap,register_t * retval)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
compat_43_sys_getpeername(struct lwp * l,const struct compat_43_sys_getpeername_args * uap,register_t * retval)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
compat_43_sys_getsockname(struct lwp * l,const struct compat_43_sys_getsockname_args * uap,register_t * retval)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
compat_43_sys_recv(struct lwp * l,const struct compat_43_sys_recv_args * uap,register_t * retval)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
compat_43_sys_recvfrom(struct lwp * l,const struct compat_43_sys_recvfrom_args * uap,register_t * retval)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
compat_43_sys_recvmsg(struct lwp * l,const struct compat_43_sys_recvmsg_args * uap,register_t * retval)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
compat_43_sys_send(struct lwp * l,const struct compat_43_sys_send_args * uap,register_t * retval)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
compat43_set_accrights(struct msghdr * msg,void * accrights,int accrightslen)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
compat_43_sys_sendmsg(struct lwp * l,const struct compat_43_sys_sendmsg_args * uap,register_t * retval)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
compat_43_sa_put(void * from)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
uipc_syscalls_43_init(void)424 uipc_syscalls_43_init(void)
425 {
426
427 return syscall_establish(NULL, uipc_syscalls_43_syscalls);
428 }
429
430 int
uipc_syscalls_43_fini(void)431 uipc_syscalls_43_fini(void)
432 {
433
434 return syscall_disestablish(NULL, uipc_syscalls_43_syscalls);
435 }
436