blob: d99ab969589397f9cc844db57aac0b7ab2f9711f [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * 32bit Socket syscall emulation. Based on arch/sparc64/kernel/sys_sparc32.c.
3 *
4 * Copyright (C) 2000 VA Linux Co
5 * Copyright (C) 2000 Don Dugger <n0ano@valinux.com>
6 * Copyright (C) 1999 Arun Sharma <arun.sharma@intel.com>
7 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
8 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
9 * Copyright (C) 2000 Hewlett-Packard Co.
10 * Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com>
11 * Copyright (C) 2000,2001 Andi Kleen, SuSE Labs
12 */
13
14#include <linux/kernel.h>
15#include <linux/fs.h>
16#include <linux/sched.h>
17#include <linux/types.h>
18#include <linux/file.h>
19#include <linux/icmpv6.h>
20#include <linux/socket.h>
21#include <linux/syscalls.h>
22#include <linux/filter.h>
23#include <linux/compat.h>
24#include <linux/netfilter_ipv4/ip_tables.h>
25#include <linux/security.h>
26
27#include <net/scm.h>
28#include <net/sock.h>
29#include <asm/uaccess.h>
30#include <net/compat.h>
31
32static inline int iov_from_user_compat_to_kern(struct iovec *kiov,
33 struct compat_iovec __user *uiov32,
34 int niov)
35{
36 int tot_len = 0;
37
38 while(niov > 0) {
39 compat_uptr_t buf;
40 compat_size_t len;
41
42 if(get_user(len, &uiov32->iov_len) ||
43 get_user(buf, &uiov32->iov_base)) {
44 tot_len = -EFAULT;
45 break;
46 }
47 tot_len += len;
48 kiov->iov_base = compat_ptr(buf);
49 kiov->iov_len = (__kernel_size_t) len;
50 uiov32++;
51 kiov++;
52 niov--;
53 }
54 return tot_len;
55}
56
57int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg)
58{
59 compat_uptr_t tmp1, tmp2, tmp3;
60
61 if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
62 __get_user(tmp1, &umsg->msg_name) ||
63 __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
64 __get_user(tmp2, &umsg->msg_iov) ||
65 __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) ||
66 __get_user(tmp3, &umsg->msg_control) ||
67 __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
68 __get_user(kmsg->msg_flags, &umsg->msg_flags))
69 return -EFAULT;
70 kmsg->msg_name = compat_ptr(tmp1);
71 kmsg->msg_iov = compat_ptr(tmp2);
72 kmsg->msg_control = compat_ptr(tmp3);
73 return 0;
74}
75
76/* I've named the args so it is easy to tell whose space the pointers are in. */
77int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov,
78 char *kern_address, int mode)
79{
80 int tot_len;
81
82 if(kern_msg->msg_namelen) {
83 if(mode==VERIFY_READ) {
84 int err = move_addr_to_kernel(kern_msg->msg_name,
85 kern_msg->msg_namelen,
86 kern_address);
87 if(err < 0)
88 return err;
89 }
90 kern_msg->msg_name = kern_address;
91 } else
92 kern_msg->msg_name = NULL;
93
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 tot_len = iov_from_user_compat_to_kern(kern_iov,
95 (struct compat_iovec __user *)kern_msg->msg_iov,
96 kern_msg->msg_iovlen);
97 if(tot_len >= 0)
98 kern_msg->msg_iov = kern_iov;
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
100 return tot_len;
101}
102
103/* Bleech... */
104#define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32))
105
106#define CMSG_COMPAT_DATA(cmsg) \
107 ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
108#define CMSG_COMPAT_SPACE(len) \
109 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
110#define CMSG_COMPAT_LEN(len) \
111 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
112
113#define CMSG_COMPAT_FIRSTHDR(msg) \
114 (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \
115 (struct compat_cmsghdr __user *)((msg)->msg_control) : \
116 (struct compat_cmsghdr __user *)NULL)
117
118#define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
119 ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
120 (ucmlen) <= (unsigned long) \
121 ((mhdr)->msg_controllen - \
122 ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
123
124static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
125 struct compat_cmsghdr __user *cmsg, int cmsg_len)
126{
127 char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
128 if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
129 msg->msg_controllen)
130 return NULL;
131 return (struct compat_cmsghdr __user *)ptr;
132}
133
134/* There is a lot of hair here because the alignment rules (and
135 * thus placement) of cmsg headers and length are different for
136 * 32-bit apps. -DaveM
137 */
138int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg,
139 unsigned char *stackbuf, int stackbuf_size)
140{
141 struct compat_cmsghdr __user *ucmsg;
142 struct cmsghdr *kcmsg, *kcmsg_base;
143 compat_size_t ucmlen;
144 __kernel_size_t kcmlen, tmp;
145
146 kcmlen = 0;
147 kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
148 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
149 while(ucmsg != NULL) {
150 if(get_user(ucmlen, &ucmsg->cmsg_len))
151 return -EFAULT;
152
153 /* Catch bogons. */
154 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
155 return -EINVAL;
156
157 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
158 CMSG_ALIGN(sizeof(struct cmsghdr)));
159 kcmlen += tmp;
160 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
161 }
162 if(kcmlen == 0)
163 return -EINVAL;
164
165 /* The kcmlen holds the 64-bit version of the control length.
166 * It may not be modified as we do not stick it into the kmsg
167 * until we have successfully copied over all of the data
168 * from the user.
169 */
170 if(kcmlen > stackbuf_size)
171 kcmsg_base = kcmsg = kmalloc(kcmlen, GFP_KERNEL);
172 if(kcmsg == NULL)
173 return -ENOBUFS;
174
175 /* Now copy them over neatly. */
176 memset(kcmsg, 0, kcmlen);
177 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
178 while(ucmsg != NULL) {
179 __get_user(ucmlen, &ucmsg->cmsg_len);
180 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
181 CMSG_ALIGN(sizeof(struct cmsghdr)));
182 kcmsg->cmsg_len = tmp;
183 __get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level);
184 __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type);
185
186 /* Copy over the data. */
187 if(copy_from_user(CMSG_DATA(kcmsg),
188 CMSG_COMPAT_DATA(ucmsg),
189 (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
190 goto out_free_efault;
191
192 /* Advance. */
193 kcmsg = (struct cmsghdr *)((char *)kcmsg + CMSG_ALIGN(tmp));
194 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
195 }
196
197 /* Ok, looks like we made it. Hook it up and return success. */
198 kmsg->msg_control = kcmsg_base;
199 kmsg->msg_controllen = kcmlen;
200 return 0;
201
202out_free_efault:
203 if(kcmsg_base != (struct cmsghdr *)stackbuf)
204 kfree(kcmsg_base);
205 return -EFAULT;
206}
207
208int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
209{
210 struct compat_timeval ctv;
211 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
212 struct compat_cmsghdr cmhdr;
213 int cmlen;
214
215 if(cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
216 kmsg->msg_flags |= MSG_CTRUNC;
217 return 0; /* XXX: return error? check spec. */
218 }
219
220 if (level == SOL_SOCKET && type == SO_TIMESTAMP) {
221 struct timeval *tv = (struct timeval *)data;
222 ctv.tv_sec = tv->tv_sec;
223 ctv.tv_usec = tv->tv_usec;
224 data = &ctv;
225 len = sizeof(struct compat_timeval);
226 }
227
228 cmlen = CMSG_COMPAT_LEN(len);
229 if(kmsg->msg_controllen < cmlen) {
230 kmsg->msg_flags |= MSG_CTRUNC;
231 cmlen = kmsg->msg_controllen;
232 }
233 cmhdr.cmsg_level = level;
234 cmhdr.cmsg_type = type;
235 cmhdr.cmsg_len = cmlen;
236
237 if(copy_to_user(cm, &cmhdr, sizeof cmhdr))
238 return -EFAULT;
239 if(copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
240 return -EFAULT;
241 cmlen = CMSG_COMPAT_SPACE(len);
242 kmsg->msg_control += cmlen;
243 kmsg->msg_controllen -= cmlen;
244 return 0;
245}
246
247void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
248{
249 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
250 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
251 int fdnum = scm->fp->count;
252 struct file **fp = scm->fp->fp;
253 int __user *cmfptr;
254 int err = 0, i;
255
256 if (fdnum < fdmax)
257 fdmax = fdnum;
258
259 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
260 int new_fd;
261 err = security_file_receive(fp[i]);
262 if (err)
263 break;
264 err = get_unused_fd();
265 if (err < 0)
266 break;
267 new_fd = err;
268 err = put_user(new_fd, cmfptr);
269 if (err) {
270 put_unused_fd(new_fd);
271 break;
272 }
273 /* Bump the usage count and install the file. */
274 get_file(fp[i]);
275 fd_install(new_fd, fp[i]);
276 }
277
278 if (i > 0) {
279 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
280 if (!err)
281 err = put_user(SOL_SOCKET, &cm->cmsg_level);
282 if (!err)
283 err = put_user(SCM_RIGHTS, &cm->cmsg_type);
284 if (!err)
285 err = put_user(cmlen, &cm->cmsg_len);
286 if (!err) {
287 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
288 kmsg->msg_control += cmlen;
289 kmsg->msg_controllen -= cmlen;
290 }
291 }
292 if (i < fdnum)
293 kmsg->msg_flags |= MSG_CTRUNC;
294
295 /*
296 * All of the files that fit in the message have had their
297 * usage counts incremented, so we just free the list.
298 */
299 __scm_destroy(scm);
300}
301
302/*
303 * For now, we assume that the compatibility and native version
304 * of struct ipt_entry are the same - sfr. FIXME
305 */
306struct compat_ipt_replace {
307 char name[IPT_TABLE_MAXNAMELEN];
308 u32 valid_hooks;
309 u32 num_entries;
310 u32 size;
311 u32 hook_entry[NF_IP_NUMHOOKS];
312 u32 underflow[NF_IP_NUMHOOKS];
313 u32 num_counters;
314 compat_uptr_t counters; /* struct ipt_counters * */
315 struct ipt_entry entries[0];
316};
317
318static int do_netfilter_replace(int fd, int level, int optname,
319 char __user *optval, int optlen)
320{
321 struct compat_ipt_replace __user *urepl;
322 struct ipt_replace __user *repl_nat;
323 char name[IPT_TABLE_MAXNAMELEN];
324 u32 origsize, tmp32, num_counters;
325 unsigned int repl_nat_size;
326 int ret;
327 int i;
328 compat_uptr_t ucntrs;
329
330 urepl = (struct compat_ipt_replace __user *)optval;
331 if (get_user(origsize, &urepl->size))
332 return -EFAULT;
333
334 /* Hack: Causes ipchains to give correct error msg --RR */
335 if (optlen != sizeof(*urepl) + origsize)
336 return -ENOPROTOOPT;
337
338 /* XXX Assumes that size of ipt_entry is the same both in
339 * native and compat environments.
340 */
341 repl_nat_size = sizeof(*repl_nat) + origsize;
342 repl_nat = compat_alloc_user_space(repl_nat_size);
343
344 ret = -EFAULT;
345 if (put_user(origsize, &repl_nat->size))
346 goto out;
347
348 if (!access_ok(VERIFY_READ, urepl, optlen) ||
349 !access_ok(VERIFY_WRITE, repl_nat, optlen))
350 goto out;
351
352 if (__copy_from_user(name, urepl->name, sizeof(urepl->name)) ||
353 __copy_to_user(repl_nat->name, name, sizeof(repl_nat->name)))
354 goto out;
355
356 if (__get_user(tmp32, &urepl->valid_hooks) ||
357 __put_user(tmp32, &repl_nat->valid_hooks))
358 goto out;
359
360 if (__get_user(tmp32, &urepl->num_entries) ||
361 __put_user(tmp32, &repl_nat->num_entries))
362 goto out;
363
364 if (__get_user(num_counters, &urepl->num_counters) ||
365 __put_user(num_counters, &repl_nat->num_counters))
366 goto out;
367
368 if (__get_user(ucntrs, &urepl->counters) ||
369 __put_user(compat_ptr(ucntrs), &repl_nat->counters))
370 goto out;
371
372 if (__copy_in_user(&repl_nat->entries[0],
373 &urepl->entries[0],
374 origsize))
375 goto out;
376
377 for (i = 0; i < NF_IP_NUMHOOKS; i++) {
378 if (__get_user(tmp32, &urepl->hook_entry[i]) ||
379 __put_user(tmp32, &repl_nat->hook_entry[i]) ||
380 __get_user(tmp32, &urepl->underflow[i]) ||
381 __put_user(tmp32, &repl_nat->underflow[i]))
382 goto out;
383 }
384
385 /*
386 * Since struct ipt_counters just contains two u_int64_t members
387 * we can just do the access_ok check here and pass the (converted)
388 * pointer into the standard syscall. We hope that the pointer is
389 * not misaligned ...
390 */
391 if (!access_ok(VERIFY_WRITE, compat_ptr(ucntrs),
392 num_counters * sizeof(struct ipt_counters)))
393 goto out;
394
395
396 ret = sys_setsockopt(fd, level, optname,
397 (char __user *)repl_nat, repl_nat_size);
398
399out:
400 return ret;
401}
402
403/*
404 * A struct sock_filter is architecture independent.
405 */
406struct compat_sock_fprog {
407 u16 len;
408 compat_uptr_t filter; /* struct sock_filter * */
409};
410
411static int do_set_attach_filter(int fd, int level, int optname,
412 char __user *optval, int optlen)
413{
414 struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
415 struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
416 compat_uptr_t ptr;
417 u16 len;
418
419 if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
420 !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
421 __get_user(len, &fprog32->len) ||
422 __get_user(ptr, &fprog32->filter) ||
423 __put_user(len, &kfprog->len) ||
424 __put_user(compat_ptr(ptr), &kfprog->filter))
425 return -EFAULT;
426
427 return sys_setsockopt(fd, level, optname, (char __user *)kfprog,
428 sizeof(struct sock_fprog));
429}
430
431static int do_set_sock_timeout(int fd, int level, int optname, char __user *optval, int optlen)
432{
433 struct compat_timeval __user *up = (struct compat_timeval __user *) optval;
434 struct timeval ktime;
435 mm_segment_t old_fs;
436 int err;
437
438 if (optlen < sizeof(*up))
439 return -EINVAL;
440 if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
441 __get_user(ktime.tv_sec, &up->tv_sec) ||
442 __get_user(ktime.tv_usec, &up->tv_usec))
443 return -EFAULT;
444 old_fs = get_fs();
445 set_fs(KERNEL_DS);
446 err = sys_setsockopt(fd, level, optname, (char *) &ktime, sizeof(ktime));
447 set_fs(old_fs);
448
449 return err;
450}
451
452asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
453 char __user *optval, int optlen)
454{
455 /* SO_SET_REPLACE seems to be the same in all levels */
456 if (optname == IPT_SO_SET_REPLACE)
457 return do_netfilter_replace(fd, level, optname,
458 optval, optlen);
459 if (level == SOL_SOCKET && optname == SO_ATTACH_FILTER)
460 return do_set_attach_filter(fd, level, optname,
461 optval, optlen);
462 if (level == SOL_SOCKET &&
463 (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO))
464 return do_set_sock_timeout(fd, level, optname, optval, optlen);
465
466 return sys_setsockopt(fd, level, optname, optval, optlen);
467}
468
469static int do_get_sock_timeout(int fd, int level, int optname,
470 char __user *optval, int __user *optlen)
471{
472 struct compat_timeval __user *up;
473 struct timeval ktime;
474 mm_segment_t old_fs;
475 int len, err;
476
477 up = (struct compat_timeval __user *) optval;
478 if (get_user(len, optlen))
479 return -EFAULT;
480 if (len < sizeof(*up))
481 return -EINVAL;
482 len = sizeof(ktime);
483 old_fs = get_fs();
484 set_fs(KERNEL_DS);
485 err = sys_getsockopt(fd, level, optname, (char *) &ktime, &len);
486 set_fs(old_fs);
487
488 if (!err) {
489 if (put_user(sizeof(*up), optlen) ||
490 !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
491 __put_user(ktime.tv_sec, &up->tv_sec) ||
492 __put_user(ktime.tv_usec, &up->tv_usec))
493 err = -EFAULT;
494 }
495 return err;
496}
497
498asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
499 char __user *optval, int __user *optlen)
500{
501 if (level == SOL_SOCKET &&
502 (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO))
503 return do_get_sock_timeout(fd, level, optname, optval, optlen);
504 return sys_getsockopt(fd, level, optname, optval, optlen);
505}
506
507/* Argument list sizes for compat_sys_socketcall */
508#define AL(x) ((x) * sizeof(u32))
509static unsigned char nas[18]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3),
510 AL(3),AL(3),AL(4),AL(4),AL(4),AL(6),
511 AL(6),AL(2),AL(5),AL(5),AL(3),AL(3)};
512#undef AL
513
514asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags)
515{
516 return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
517}
518
519asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
520{
521 return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
522}
523
524asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
525{
526 int ret;
527 u32 a[6];
528 u32 a0, a1;
529
530 if (call < SYS_SOCKET || call > SYS_RECVMSG)
531 return -EINVAL;
532 if (copy_from_user(a, args, nas[call]))
533 return -EFAULT;
534 a0 = a[0];
535 a1 = a[1];
536
537 switch(call) {
538 case SYS_SOCKET:
539 ret = sys_socket(a0, a1, a[2]);
540 break;
541 case SYS_BIND:
542 ret = sys_bind(a0, compat_ptr(a1), a[2]);
543 break;
544 case SYS_CONNECT:
545 ret = sys_connect(a0, compat_ptr(a1), a[2]);
546 break;
547 case SYS_LISTEN:
548 ret = sys_listen(a0, a1);
549 break;
550 case SYS_ACCEPT:
551 ret = sys_accept(a0, compat_ptr(a1), compat_ptr(a[2]));
552 break;
553 case SYS_GETSOCKNAME:
554 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
555 break;
556 case SYS_GETPEERNAME:
557 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
558 break;
559 case SYS_SOCKETPAIR:
560 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
561 break;
562 case SYS_SEND:
563 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
564 break;
565 case SYS_SENDTO:
566 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
567 break;
568 case SYS_RECV:
569 ret = sys_recv(a0, compat_ptr(a1), a[2], a[3]);
570 break;
571 case SYS_RECVFROM:
572 ret = sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), compat_ptr(a[5]));
573 break;
574 case SYS_SHUTDOWN:
575 ret = sys_shutdown(a0,a1);
576 break;
577 case SYS_SETSOCKOPT:
578 ret = compat_sys_setsockopt(a0, a1, a[2],
579 compat_ptr(a[3]), a[4]);
580 break;
581 case SYS_GETSOCKOPT:
582 ret = compat_sys_getsockopt(a0, a1, a[2],
583 compat_ptr(a[3]), compat_ptr(a[4]));
584 break;
585 case SYS_SENDMSG:
586 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
587 break;
588 case SYS_RECVMSG:
589 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
590 break;
591 default:
592 ret = -EINVAL;
593 break;
594 }
595 return ret;
596}