Root/net/compat.c

1/*
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/gfp.h>
16#include <linux/fs.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/security.h>
25
26#include <net/scm.h>
27#include <net/sock.h>
28#include <net/ip.h>
29#include <net/ipv6.h>
30#include <asm/uaccess.h>
31#include <net/compat.h>
32
33static inline int iov_from_user_compat_to_kern(struct iovec *kiov,
34                      struct compat_iovec __user *uiov32,
35                      int niov)
36{
37    int tot_len = 0;
38
39    while (niov > 0) {
40        compat_uptr_t buf;
41        compat_size_t len;
42
43        if (get_user(len, &uiov32->iov_len) ||
44           get_user(buf, &uiov32->iov_base)) {
45            tot_len = -EFAULT;
46            break;
47        }
48        tot_len += len;
49        kiov->iov_base = compat_ptr(buf);
50        kiov->iov_len = (__kernel_size_t) len;
51        uiov32++;
52        kiov++;
53        niov--;
54    }
55    return tot_len;
56}
57
58int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg)
59{
60    compat_uptr_t tmp1, tmp2, tmp3;
61
62    if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
63        __get_user(tmp1, &umsg->msg_name) ||
64        __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
65        __get_user(tmp2, &umsg->msg_iov) ||
66        __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) ||
67        __get_user(tmp3, &umsg->msg_control) ||
68        __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
69        __get_user(kmsg->msg_flags, &umsg->msg_flags))
70        return -EFAULT;
71    kmsg->msg_name = compat_ptr(tmp1);
72    kmsg->msg_iov = compat_ptr(tmp2);
73    kmsg->msg_control = compat_ptr(tmp3);
74    return 0;
75}
76
77/* I've named the args so it is easy to tell whose space the pointers are in. */
78int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov,
79           struct sockaddr *kern_address, int mode)
80{
81    int tot_len;
82
83    if (kern_msg->msg_namelen) {
84        if (mode == VERIFY_READ) {
85            int err = move_addr_to_kernel(kern_msg->msg_name,
86                              kern_msg->msg_namelen,
87                              kern_address);
88            if (err < 0)
89                return err;
90        }
91        kern_msg->msg_name = kern_address;
92    } else
93        kern_msg->msg_name = NULL;
94
95    tot_len = iov_from_user_compat_to_kern(kern_iov,
96                      (struct compat_iovec __user *)kern_msg->msg_iov,
97                      kern_msg->msg_iovlen);
98    if (tot_len >= 0)
99        kern_msg->msg_iov = kern_iov;
100
101    return tot_len;
102}
103
104/* Bleech... */
105#define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32))
106
107#define CMSG_COMPAT_DATA(cmsg) \
108    ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
109#define CMSG_COMPAT_SPACE(len) \
110    (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
111#define CMSG_COMPAT_LEN(len) \
112    (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
113
114#define CMSG_COMPAT_FIRSTHDR(msg) \
115    (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \
116     (struct compat_cmsghdr __user *)((msg)->msg_control) : \
117     (struct compat_cmsghdr __user *)NULL)
118
119#define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
120    ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
121     (ucmlen) <= (unsigned long) \
122     ((mhdr)->msg_controllen - \
123      ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
124
125static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
126        struct compat_cmsghdr __user *cmsg, int cmsg_len)
127{
128    char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
129    if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
130            msg->msg_controllen)
131        return NULL;
132    return (struct compat_cmsghdr __user *)ptr;
133}
134
135/* There is a lot of hair here because the alignment rules (and
136 * thus placement) of cmsg headers and length are different for
137 * 32-bit apps. -DaveM
138 */
139int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
140                   unsigned char *stackbuf, int stackbuf_size)
141{
142    struct compat_cmsghdr __user *ucmsg;
143    struct cmsghdr *kcmsg, *kcmsg_base;
144    compat_size_t ucmlen;
145    __kernel_size_t kcmlen, tmp;
146    int err = -EFAULT;
147
148    kcmlen = 0;
149    kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
150    ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
151    while (ucmsg != NULL) {
152        if (get_user(ucmlen, &ucmsg->cmsg_len))
153            return -EFAULT;
154
155        /* Catch bogons. */
156        if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
157            return -EINVAL;
158
159        tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
160               CMSG_ALIGN(sizeof(struct cmsghdr)));
161        tmp = CMSG_ALIGN(tmp);
162        kcmlen += tmp;
163        ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
164    }
165    if (kcmlen == 0)
166        return -EINVAL;
167
168    /* The kcmlen holds the 64-bit version of the control length.
169     * It may not be modified as we do not stick it into the kmsg
170     * until we have successfully copied over all of the data
171     * from the user.
172     */
173    if (kcmlen > stackbuf_size)
174        kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
175    if (kcmsg == NULL)
176        return -ENOBUFS;
177
178    /* Now copy them over neatly. */
179    memset(kcmsg, 0, kcmlen);
180    ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
181    while (ucmsg != NULL) {
182        if (__get_user(ucmlen, &ucmsg->cmsg_len))
183            goto Efault;
184        if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
185            goto Einval;
186        tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
187               CMSG_ALIGN(sizeof(struct cmsghdr)));
188        if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
189            goto Einval;
190        kcmsg->cmsg_len = tmp;
191        tmp = CMSG_ALIGN(tmp);
192        if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
193            __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
194            copy_from_user(CMSG_DATA(kcmsg),
195                   CMSG_COMPAT_DATA(ucmsg),
196                   (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
197            goto Efault;
198
199        /* Advance. */
200        kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
201        ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
202    }
203
204    /* Ok, looks like we made it. Hook it up and return success. */
205    kmsg->msg_control = kcmsg_base;
206    kmsg->msg_controllen = kcmlen;
207    return 0;
208
209Einval:
210    err = -EINVAL;
211Efault:
212    if (kcmsg_base != (struct cmsghdr *)stackbuf)
213        sock_kfree_s(sk, kcmsg_base, kcmlen);
214    return err;
215}
216
217int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
218{
219    struct compat_timeval ctv;
220    struct compat_timespec cts[3];
221    struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
222    struct compat_cmsghdr cmhdr;
223    int cmlen;
224
225    if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
226        kmsg->msg_flags |= MSG_CTRUNC;
227        return 0; /* XXX: return error? check spec. */
228    }
229
230    if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
231        struct timeval *tv = (struct timeval *)data;
232        ctv.tv_sec = tv->tv_sec;
233        ctv.tv_usec = tv->tv_usec;
234        data = &ctv;
235        len = sizeof(ctv);
236    }
237    if (level == SOL_SOCKET &&
238        (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
239        int count = type == SCM_TIMESTAMPNS ? 1 : 3;
240        int i;
241        struct timespec *ts = (struct timespec *)data;
242        for (i = 0; i < count; i++) {
243            cts[i].tv_sec = ts[i].tv_sec;
244            cts[i].tv_nsec = ts[i].tv_nsec;
245        }
246        data = &cts;
247        len = sizeof(cts[0]) * count;
248    }
249
250    cmlen = CMSG_COMPAT_LEN(len);
251    if (kmsg->msg_controllen < cmlen) {
252        kmsg->msg_flags |= MSG_CTRUNC;
253        cmlen = kmsg->msg_controllen;
254    }
255    cmhdr.cmsg_level = level;
256    cmhdr.cmsg_type = type;
257    cmhdr.cmsg_len = cmlen;
258
259    if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
260        return -EFAULT;
261    if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
262        return -EFAULT;
263    cmlen = CMSG_COMPAT_SPACE(len);
264    if (kmsg->msg_controllen < cmlen)
265        cmlen = kmsg->msg_controllen;
266    kmsg->msg_control += cmlen;
267    kmsg->msg_controllen -= cmlen;
268    return 0;
269}
270
271void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
272{
273    struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
274    int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
275    int fdnum = scm->fp->count;
276    struct file **fp = scm->fp->fp;
277    int __user *cmfptr;
278    int err = 0, i;
279
280    if (fdnum < fdmax)
281        fdmax = fdnum;
282
283    for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
284        int new_fd;
285        err = security_file_receive(fp[i]);
286        if (err)
287            break;
288        err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
289                      ? O_CLOEXEC : 0);
290        if (err < 0)
291            break;
292        new_fd = err;
293        err = put_user(new_fd, cmfptr);
294        if (err) {
295            put_unused_fd(new_fd);
296            break;
297        }
298        /* Bump the usage count and install the file. */
299        get_file(fp[i]);
300        fd_install(new_fd, fp[i]);
301    }
302
303    if (i > 0) {
304        int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
305        err = put_user(SOL_SOCKET, &cm->cmsg_level);
306        if (!err)
307            err = put_user(SCM_RIGHTS, &cm->cmsg_type);
308        if (!err)
309            err = put_user(cmlen, &cm->cmsg_len);
310        if (!err) {
311            cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
312            kmsg->msg_control += cmlen;
313            kmsg->msg_controllen -= cmlen;
314        }
315    }
316    if (i < fdnum)
317        kmsg->msg_flags |= MSG_CTRUNC;
318
319    /*
320     * All of the files that fit in the message have had their
321     * usage counts incremented, so we just free the list.
322     */
323    __scm_destroy(scm);
324}
325
326/*
327 * A struct sock_filter is architecture independent.
328 */
329struct compat_sock_fprog {
330    u16 len;
331    compat_uptr_t filter; /* struct sock_filter * */
332};
333
334static int do_set_attach_filter(struct socket *sock, int level, int optname,
335                char __user *optval, unsigned int optlen)
336{
337    struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
338    struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
339    compat_uptr_t ptr;
340    u16 len;
341
342    if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
343        !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
344        __get_user(len, &fprog32->len) ||
345        __get_user(ptr, &fprog32->filter) ||
346        __put_user(len, &kfprog->len) ||
347        __put_user(compat_ptr(ptr), &kfprog->filter))
348        return -EFAULT;
349
350    return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
351                  sizeof(struct sock_fprog));
352}
353
354static int do_set_sock_timeout(struct socket *sock, int level,
355        int optname, char __user *optval, unsigned int optlen)
356{
357    struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
358    struct timeval ktime;
359    mm_segment_t old_fs;
360    int err;
361
362    if (optlen < sizeof(*up))
363        return -EINVAL;
364    if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
365        __get_user(ktime.tv_sec, &up->tv_sec) ||
366        __get_user(ktime.tv_usec, &up->tv_usec))
367        return -EFAULT;
368    old_fs = get_fs();
369    set_fs(KERNEL_DS);
370    err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
371    set_fs(old_fs);
372
373    return err;
374}
375
376static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
377                char __user *optval, unsigned int optlen)
378{
379    if (optname == SO_ATTACH_FILTER)
380        return do_set_attach_filter(sock, level, optname,
381                        optval, optlen);
382    if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
383        return do_set_sock_timeout(sock, level, optname, optval, optlen);
384
385    return sock_setsockopt(sock, level, optname, optval, optlen);
386}
387
388asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
389                char __user *optval, unsigned int optlen)
390{
391    int err;
392    struct socket *sock = sockfd_lookup(fd, &err);
393
394    if (sock) {
395        err = security_socket_setsockopt(sock, level, optname);
396        if (err) {
397            sockfd_put(sock);
398            return err;
399        }
400
401        if (level == SOL_SOCKET)
402            err = compat_sock_setsockopt(sock, level,
403                    optname, optval, optlen);
404        else if (sock->ops->compat_setsockopt)
405            err = sock->ops->compat_setsockopt(sock, level,
406                    optname, optval, optlen);
407        else
408            err = sock->ops->setsockopt(sock, level,
409                    optname, optval, optlen);
410        sockfd_put(sock);
411    }
412    return err;
413}
414
415static int do_get_sock_timeout(struct socket *sock, int level, int optname,
416        char __user *optval, int __user *optlen)
417{
418    struct compat_timeval __user *up;
419    struct timeval ktime;
420    mm_segment_t old_fs;
421    int len, err;
422
423    up = (struct compat_timeval __user *) optval;
424    if (get_user(len, optlen))
425        return -EFAULT;
426    if (len < sizeof(*up))
427        return -EINVAL;
428    len = sizeof(ktime);
429    old_fs = get_fs();
430    set_fs(KERNEL_DS);
431    err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
432    set_fs(old_fs);
433
434    if (!err) {
435        if (put_user(sizeof(*up), optlen) ||
436            !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
437            __put_user(ktime.tv_sec, &up->tv_sec) ||
438            __put_user(ktime.tv_usec, &up->tv_usec))
439            err = -EFAULT;
440    }
441    return err;
442}
443
444static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
445                char __user *optval, int __user *optlen)
446{
447    if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
448        return do_get_sock_timeout(sock, level, optname, optval, optlen);
449    return sock_getsockopt(sock, level, optname, optval, optlen);
450}
451
452int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
453{
454    struct compat_timeval __user *ctv =
455            (struct compat_timeval __user *) userstamp;
456    int err = -ENOENT;
457    struct timeval tv;
458
459    if (!sock_flag(sk, SOCK_TIMESTAMP))
460        sock_enable_timestamp(sk, SOCK_TIMESTAMP);
461    tv = ktime_to_timeval(sk->sk_stamp);
462    if (tv.tv_sec == -1)
463        return err;
464    if (tv.tv_sec == 0) {
465        sk->sk_stamp = ktime_get_real();
466        tv = ktime_to_timeval(sk->sk_stamp);
467    }
468    err = 0;
469    if (put_user(tv.tv_sec, &ctv->tv_sec) ||
470            put_user(tv.tv_usec, &ctv->tv_usec))
471        err = -EFAULT;
472    return err;
473}
474EXPORT_SYMBOL(compat_sock_get_timestamp);
475
476int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
477{
478    struct compat_timespec __user *ctv =
479            (struct compat_timespec __user *) userstamp;
480    int err = -ENOENT;
481    struct timespec ts;
482
483    if (!sock_flag(sk, SOCK_TIMESTAMP))
484        sock_enable_timestamp(sk, SOCK_TIMESTAMP);
485    ts = ktime_to_timespec(sk->sk_stamp);
486    if (ts.tv_sec == -1)
487        return err;
488    if (ts.tv_sec == 0) {
489        sk->sk_stamp = ktime_get_real();
490        ts = ktime_to_timespec(sk->sk_stamp);
491    }
492    err = 0;
493    if (put_user(ts.tv_sec, &ctv->tv_sec) ||
494            put_user(ts.tv_nsec, &ctv->tv_nsec))
495        err = -EFAULT;
496    return err;
497}
498EXPORT_SYMBOL(compat_sock_get_timestampns);
499
500asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
501                char __user *optval, int __user *optlen)
502{
503    int err;
504    struct socket *sock = sockfd_lookup(fd, &err);
505
506    if (sock) {
507        err = security_socket_getsockopt(sock, level, optname);
508        if (err) {
509            sockfd_put(sock);
510            return err;
511        }
512
513        if (level == SOL_SOCKET)
514            err = compat_sock_getsockopt(sock, level,
515                    optname, optval, optlen);
516        else if (sock->ops->compat_getsockopt)
517            err = sock->ops->compat_getsockopt(sock, level,
518                    optname, optval, optlen);
519        else
520            err = sock->ops->getsockopt(sock, level,
521                    optname, optval, optlen);
522        sockfd_put(sock);
523    }
524    return err;
525}
526
527struct compat_group_req {
528    __u32 gr_interface;
529    struct __kernel_sockaddr_storage gr_group
530        __attribute__ ((aligned(4)));
531} __packed;
532
533struct compat_group_source_req {
534    __u32 gsr_interface;
535    struct __kernel_sockaddr_storage gsr_group
536        __attribute__ ((aligned(4)));
537    struct __kernel_sockaddr_storage gsr_source
538        __attribute__ ((aligned(4)));
539} __packed;
540
541struct compat_group_filter {
542    __u32 gf_interface;
543    struct __kernel_sockaddr_storage gf_group
544        __attribute__ ((aligned(4)));
545    __u32 gf_fmode;
546    __u32 gf_numsrc;
547    struct __kernel_sockaddr_storage gf_slist[1]
548        __attribute__ ((aligned(4)));
549} __packed;
550
551#define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
552            sizeof(struct __kernel_sockaddr_storage))
553
554
555int compat_mc_setsockopt(struct sock *sock, int level, int optname,
556    char __user *optval, unsigned int optlen,
557    int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
558{
559    char __user *koptval = optval;
560    int koptlen = optlen;
561
562    switch (optname) {
563    case MCAST_JOIN_GROUP:
564    case MCAST_LEAVE_GROUP:
565    {
566        struct compat_group_req __user *gr32 = (void *)optval;
567        struct group_req __user *kgr =
568            compat_alloc_user_space(sizeof(struct group_req));
569        u32 interface;
570
571        if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
572            !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
573            __get_user(interface, &gr32->gr_interface) ||
574            __put_user(interface, &kgr->gr_interface) ||
575            copy_in_user(&kgr->gr_group, &gr32->gr_group,
576                sizeof(kgr->gr_group)))
577            return -EFAULT;
578        koptval = (char __user *)kgr;
579        koptlen = sizeof(struct group_req);
580        break;
581    }
582    case MCAST_JOIN_SOURCE_GROUP:
583    case MCAST_LEAVE_SOURCE_GROUP:
584    case MCAST_BLOCK_SOURCE:
585    case MCAST_UNBLOCK_SOURCE:
586    {
587        struct compat_group_source_req __user *gsr32 = (void *)optval;
588        struct group_source_req __user *kgsr = compat_alloc_user_space(
589            sizeof(struct group_source_req));
590        u32 interface;
591
592        if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
593            !access_ok(VERIFY_WRITE, kgsr,
594            sizeof(struct group_source_req)) ||
595            __get_user(interface, &gsr32->gsr_interface) ||
596            __put_user(interface, &kgsr->gsr_interface) ||
597            copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
598                sizeof(kgsr->gsr_group)) ||
599            copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
600                sizeof(kgsr->gsr_source)))
601            return -EFAULT;
602        koptval = (char __user *)kgsr;
603        koptlen = sizeof(struct group_source_req);
604        break;
605    }
606    case MCAST_MSFILTER:
607    {
608        struct compat_group_filter __user *gf32 = (void *)optval;
609        struct group_filter __user *kgf;
610        u32 interface, fmode, numsrc;
611
612        if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
613            __get_user(interface, &gf32->gf_interface) ||
614            __get_user(fmode, &gf32->gf_fmode) ||
615            __get_user(numsrc, &gf32->gf_numsrc))
616            return -EFAULT;
617        koptlen = optlen + sizeof(struct group_filter) -
618                sizeof(struct compat_group_filter);
619        if (koptlen < GROUP_FILTER_SIZE(numsrc))
620            return -EINVAL;
621        kgf = compat_alloc_user_space(koptlen);
622        if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
623            __put_user(interface, &kgf->gf_interface) ||
624            __put_user(fmode, &kgf->gf_fmode) ||
625            __put_user(numsrc, &kgf->gf_numsrc) ||
626            copy_in_user(&kgf->gf_group, &gf32->gf_group,
627                sizeof(kgf->gf_group)) ||
628            (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
629                numsrc * sizeof(kgf->gf_slist[0]))))
630            return -EFAULT;
631        koptval = (char __user *)kgf;
632        break;
633    }
634
635    default:
636        break;
637    }
638    return setsockopt(sock, level, optname, koptval, koptlen);
639}
640EXPORT_SYMBOL(compat_mc_setsockopt);
641
642int compat_mc_getsockopt(struct sock *sock, int level, int optname,
643    char __user *optval, int __user *optlen,
644    int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
645{
646    struct compat_group_filter __user *gf32 = (void *)optval;
647    struct group_filter __user *kgf;
648    int __user *koptlen;
649    u32 interface, fmode, numsrc;
650    int klen, ulen, err;
651
652    if (optname != MCAST_MSFILTER)
653        return getsockopt(sock, level, optname, optval, optlen);
654
655    koptlen = compat_alloc_user_space(sizeof(*koptlen));
656    if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
657        __get_user(ulen, optlen))
658        return -EFAULT;
659
660    /* adjust len for pad */
661    klen = ulen + sizeof(*kgf) - sizeof(*gf32);
662
663    if (klen < GROUP_FILTER_SIZE(0))
664        return -EINVAL;
665
666    if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
667        __put_user(klen, koptlen))
668        return -EFAULT;
669
670    /* have to allow space for previous compat_alloc_user_space, too */
671    kgf = compat_alloc_user_space(klen+sizeof(*optlen));
672
673    if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
674        __get_user(interface, &gf32->gf_interface) ||
675        __get_user(fmode, &gf32->gf_fmode) ||
676        __get_user(numsrc, &gf32->gf_numsrc) ||
677        __put_user(interface, &kgf->gf_interface) ||
678        __put_user(fmode, &kgf->gf_fmode) ||
679        __put_user(numsrc, &kgf->gf_numsrc) ||
680        copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
681        return -EFAULT;
682
683    err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
684    if (err)
685        return err;
686
687    if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
688        __get_user(klen, koptlen))
689        return -EFAULT;
690
691    ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
692
693    if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
694        __put_user(ulen, optlen))
695        return -EFAULT;
696
697    if (!access_ok(VERIFY_READ, kgf, klen) ||
698        !access_ok(VERIFY_WRITE, gf32, ulen) ||
699        __get_user(interface, &kgf->gf_interface) ||
700        __get_user(fmode, &kgf->gf_fmode) ||
701        __get_user(numsrc, &kgf->gf_numsrc) ||
702        __put_user(interface, &gf32->gf_interface) ||
703        __put_user(fmode, &gf32->gf_fmode) ||
704        __put_user(numsrc, &gf32->gf_numsrc))
705        return -EFAULT;
706    if (numsrc) {
707        int copylen;
708
709        klen -= GROUP_FILTER_SIZE(0);
710        copylen = numsrc * sizeof(gf32->gf_slist[0]);
711        if (copylen > klen)
712            copylen = klen;
713        if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
714            return -EFAULT;
715    }
716    return err;
717}
718EXPORT_SYMBOL(compat_mc_getsockopt);
719
720
721/* Argument list sizes for compat_sys_socketcall */
722#define AL(x) ((x) * sizeof(u32))
723static unsigned char nas[20] = {
724    AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
725    AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
726    AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
727    AL(4), AL(5)
728};
729#undef AL
730
731asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags)
732{
733    return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
734}
735
736asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
737{
738    return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
739}
740
741asmlinkage long compat_sys_recv(int fd, void __user *buf, size_t len, unsigned flags)
742{
743    return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
744}
745
746asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, size_t len,
747                    unsigned flags, struct sockaddr __user *addr,
748                    int __user *addrlen)
749{
750    return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
751}
752
753asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
754                    unsigned vlen, unsigned int flags,
755                    struct compat_timespec __user *timeout)
756{
757    int datagrams;
758    struct timespec ktspec;
759
760    if (timeout == NULL)
761        return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
762                      flags | MSG_CMSG_COMPAT, NULL);
763
764    if (get_compat_timespec(&ktspec, timeout))
765        return -EFAULT;
766
767    datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
768                   flags | MSG_CMSG_COMPAT, &ktspec);
769    if (datagrams > 0 && put_compat_timespec(&ktspec, timeout))
770        datagrams = -EFAULT;
771
772    return datagrams;
773}
774
775asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
776{
777    int ret;
778    u32 a[6];
779    u32 a0, a1;
780
781    if (call < SYS_SOCKET || call > SYS_RECVMMSG)
782        return -EINVAL;
783    if (copy_from_user(a, args, nas[call]))
784        return -EFAULT;
785    a0 = a[0];
786    a1 = a[1];
787
788    switch (call) {
789    case SYS_SOCKET:
790        ret = sys_socket(a0, a1, a[2]);
791        break;
792    case SYS_BIND:
793        ret = sys_bind(a0, compat_ptr(a1), a[2]);
794        break;
795    case SYS_CONNECT:
796        ret = sys_connect(a0, compat_ptr(a1), a[2]);
797        break;
798    case SYS_LISTEN:
799        ret = sys_listen(a0, a1);
800        break;
801    case SYS_ACCEPT:
802        ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
803        break;
804    case SYS_GETSOCKNAME:
805        ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
806        break;
807    case SYS_GETPEERNAME:
808        ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
809        break;
810    case SYS_SOCKETPAIR:
811        ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
812        break;
813    case SYS_SEND:
814        ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
815        break;
816    case SYS_SENDTO:
817        ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
818        break;
819    case SYS_RECV:
820        ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
821        break;
822    case SYS_RECVFROM:
823        ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
824                      compat_ptr(a[4]), compat_ptr(a[5]));
825        break;
826    case SYS_SHUTDOWN:
827        ret = sys_shutdown(a0, a1);
828        break;
829    case SYS_SETSOCKOPT:
830        ret = compat_sys_setsockopt(a0, a1, a[2],
831                compat_ptr(a[3]), a[4]);
832        break;
833    case SYS_GETSOCKOPT:
834        ret = compat_sys_getsockopt(a0, a1, a[2],
835                compat_ptr(a[3]), compat_ptr(a[4]));
836        break;
837    case SYS_SENDMSG:
838        ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
839        break;
840    case SYS_RECVMSG:
841        ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
842        break;
843    case SYS_RECVMMSG:
844        ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
845                      compat_ptr(a[4]));
846        break;
847    case SYS_ACCEPT4:
848        ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
849        break;
850    default:
851        ret = -EINVAL;
852        break;
853    }
854    return ret;
855}
856

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