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
82static int compat_43_sa_put(void *);
83
84int
85compat_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
104int
105compat_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
124int
125compat_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
143int
144compat_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
164int
165compat_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 */
190int
191compat_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
261int
262compat_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
282int
283compat43_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 */
324int
325compat_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
374static int
375compat_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