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 | |