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#include <linux/export.h>
26
27#include <net/scm.h>
28#include <net/sock.h>
29#include <net/ip.h>
30#include <net/ipv6.h>
31#include <asm/uaccess.h>
32#include <net/compat.h>
33
34static inline int iov_from_user_compat_to_kern(struct iovec *kiov,
35                      struct compat_iovec __user *uiov32,
36                      int niov)
37{
38    int tot_len = 0;
39
40    while (niov > 0) {
41        compat_uptr_t buf;
42        compat_size_t len;
43
44        if (get_user(len, &uiov32->iov_len) ||
45            get_user(buf, &uiov32->iov_base))
46            return -EFAULT;
47
48        if (len > INT_MAX - tot_len)
49            len = INT_MAX - tot_len;
50
51        tot_len += len;
52        kiov->iov_base = compat_ptr(buf);
53        kiov->iov_len = (__kernel_size_t) len;
54        uiov32++;
55        kiov++;
56        niov--;
57    }
58    return tot_len;
59}
60
61int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg)
62{
63    compat_uptr_t tmp1, tmp2, tmp3;
64
65    if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
66        __get_user(tmp1, &umsg->msg_name) ||
67        __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
68        __get_user(tmp2, &umsg->msg_iov) ||
69        __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) ||
70        __get_user(tmp3, &umsg->msg_control) ||
71        __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
72        __get_user(kmsg->msg_flags, &umsg->msg_flags))
73        return -EFAULT;
74    if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
75        kmsg->msg_namelen = sizeof(struct sockaddr_storage);
76    kmsg->msg_name = compat_ptr(tmp1);
77    kmsg->msg_iov = compat_ptr(tmp2);
78    kmsg->msg_control = compat_ptr(tmp3);
79    return 0;
80}
81
82/* I've named the args so it is easy to tell whose space the pointers are in. */
83int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov,
84           struct sockaddr_storage *kern_address, int mode)
85{
86    int tot_len;
87
88    if (kern_msg->msg_namelen) {
89        if (mode == VERIFY_READ) {
90            int err = move_addr_to_kernel(kern_msg->msg_name,
91                              kern_msg->msg_namelen,
92                              kern_address);
93            if (err < 0)
94                return err;
95        }
96        if (kern_msg->msg_name)
97            kern_msg->msg_name = kern_address;
98    } else
99        kern_msg->msg_name = NULL;
100
101    tot_len = iov_from_user_compat_to_kern(kern_iov,
102                      (struct compat_iovec __user *)kern_msg->msg_iov,
103                      kern_msg->msg_iovlen);
104    if (tot_len >= 0)
105        kern_msg->msg_iov = kern_iov;
106
107    return tot_len;
108}
109
110/* Bleech... */
111#define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32))
112
113#define CMSG_COMPAT_DATA(cmsg) \
114    ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
115#define CMSG_COMPAT_SPACE(len) \
116    (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
117#define CMSG_COMPAT_LEN(len) \
118    (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
119
120#define CMSG_COMPAT_FIRSTHDR(msg) \
121    (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \
122     (struct compat_cmsghdr __user *)((msg)->msg_control) : \
123     (struct compat_cmsghdr __user *)NULL)
124
125#define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
126    ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
127     (ucmlen) <= (unsigned long) \
128     ((mhdr)->msg_controllen - \
129      ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
130
131static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
132        struct compat_cmsghdr __user *cmsg, int cmsg_len)
133{
134    char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
135    if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
136            msg->msg_controllen)
137        return NULL;
138    return (struct compat_cmsghdr __user *)ptr;
139}
140
141/* There is a lot of hair here because the alignment rules (and
142 * thus placement) of cmsg headers and length are different for
143 * 32-bit apps. -DaveM
144 */
145int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
146                   unsigned char *stackbuf, int stackbuf_size)
147{
148    struct compat_cmsghdr __user *ucmsg;
149    struct cmsghdr *kcmsg, *kcmsg_base;
150    compat_size_t ucmlen;
151    __kernel_size_t kcmlen, tmp;
152    int err = -EFAULT;
153
154    kcmlen = 0;
155    kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
156    ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
157    while (ucmsg != NULL) {
158        if (get_user(ucmlen, &ucmsg->cmsg_len))
159            return -EFAULT;
160
161        /* Catch bogons. */
162        if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
163            return -EINVAL;
164
165        tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
166               CMSG_ALIGN(sizeof(struct cmsghdr)));
167        tmp = CMSG_ALIGN(tmp);
168        kcmlen += tmp;
169        ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
170    }
171    if (kcmlen == 0)
172        return -EINVAL;
173
174    /* The kcmlen holds the 64-bit version of the control length.
175     * It may not be modified as we do not stick it into the kmsg
176     * until we have successfully copied over all of the data
177     * from the user.
178     */
179    if (kcmlen > stackbuf_size)
180        kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
181    if (kcmsg == NULL)
182        return -ENOBUFS;
183
184    /* Now copy them over neatly. */
185    memset(kcmsg, 0, kcmlen);
186    ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
187    while (ucmsg != NULL) {
188        if (__get_user(ucmlen, &ucmsg->cmsg_len))
189            goto Efault;
190        if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
191            goto Einval;
192        tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
193               CMSG_ALIGN(sizeof(struct cmsghdr)));
194        if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
195            goto Einval;
196        kcmsg->cmsg_len = tmp;
197        tmp = CMSG_ALIGN(tmp);
198        if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
199            __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
200            copy_from_user(CMSG_DATA(kcmsg),
201                   CMSG_COMPAT_DATA(ucmsg),
202                   (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
203            goto Efault;
204
205        /* Advance. */
206        kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
207        ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
208    }
209
210    /* Ok, looks like we made it. Hook it up and return success. */
211    kmsg->msg_control = kcmsg_base;
212    kmsg->msg_controllen = kcmlen;
213    return 0;
214
215Einval:
216    err = -EINVAL;
217Efault:
218    if (kcmsg_base != (struct cmsghdr *)stackbuf)
219        sock_kfree_s(sk, kcmsg_base, kcmlen);
220    return err;
221}
222
223int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
224{
225    struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
226    struct compat_cmsghdr cmhdr;
227    struct compat_timeval ctv;
228    struct compat_timespec cts[3];
229    int cmlen;
230
231    if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
232        kmsg->msg_flags |= MSG_CTRUNC;
233        return 0; /* XXX: return error? check spec. */
234    }
235
236    if (!COMPAT_USE_64BIT_TIME) {
237        if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
238            struct timeval *tv = (struct timeval *)data;
239            ctv.tv_sec = tv->tv_sec;
240            ctv.tv_usec = tv->tv_usec;
241            data = &ctv;
242            len = sizeof(ctv);
243        }
244        if (level == SOL_SOCKET &&
245            (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
246            int count = type == SCM_TIMESTAMPNS ? 1 : 3;
247            int i;
248            struct timespec *ts = (struct timespec *)data;
249            for (i = 0; i < count; i++) {
250                cts[i].tv_sec = ts[i].tv_sec;
251                cts[i].tv_nsec = ts[i].tv_nsec;
252            }
253            data = &cts;
254            len = sizeof(cts[0]) * count;
255        }
256    }
257
258    cmlen = CMSG_COMPAT_LEN(len);
259    if (kmsg->msg_controllen < cmlen) {
260        kmsg->msg_flags |= MSG_CTRUNC;
261        cmlen = kmsg->msg_controllen;
262    }
263    cmhdr.cmsg_level = level;
264    cmhdr.cmsg_type = type;
265    cmhdr.cmsg_len = cmlen;
266
267    if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
268        return -EFAULT;
269    if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
270        return -EFAULT;
271    cmlen = CMSG_COMPAT_SPACE(len);
272    if (kmsg->msg_controllen < cmlen)
273        cmlen = kmsg->msg_controllen;
274    kmsg->msg_control += cmlen;
275    kmsg->msg_controllen -= cmlen;
276    return 0;
277}
278
279void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
280{
281    struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
282    int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
283    int fdnum = scm->fp->count;
284    struct file **fp = scm->fp->fp;
285    int __user *cmfptr;
286    int err = 0, i;
287
288    if (fdnum < fdmax)
289        fdmax = fdnum;
290
291    for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
292        int new_fd;
293        err = security_file_receive(fp[i]);
294        if (err)
295            break;
296        err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
297                      ? O_CLOEXEC : 0);
298        if (err < 0)
299            break;
300        new_fd = err;
301        err = put_user(new_fd, cmfptr);
302        if (err) {
303            put_unused_fd(new_fd);
304            break;
305        }
306        /* Bump the usage count and install the file. */
307        fd_install(new_fd, get_file(fp[i]));
308    }
309
310    if (i > 0) {
311        int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
312        err = put_user(SOL_SOCKET, &cm->cmsg_level);
313        if (!err)
314            err = put_user(SCM_RIGHTS, &cm->cmsg_type);
315        if (!err)
316            err = put_user(cmlen, &cm->cmsg_len);
317        if (!err) {
318            cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
319            kmsg->msg_control += cmlen;
320            kmsg->msg_controllen -= cmlen;
321        }
322    }
323    if (i < fdnum)
324        kmsg->msg_flags |= MSG_CTRUNC;
325
326    /*
327     * All of the files that fit in the message have had their
328     * usage counts incremented, so we just free the list.
329     */
330    __scm_destroy(scm);
331}
332
333static int do_set_attach_filter(struct socket *sock, int level, int optname,
334                char __user *optval, unsigned int optlen)
335{
336    struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
337    struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
338    compat_uptr_t ptr;
339    u16 len;
340
341    if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
342        !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
343        __get_user(len, &fprog32->len) ||
344        __get_user(ptr, &fprog32->filter) ||
345        __put_user(len, &kfprog->len) ||
346        __put_user(compat_ptr(ptr), &kfprog->filter))
347        return -EFAULT;
348
349    return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
350                  sizeof(struct sock_fprog));
351}
352
353static int do_set_sock_timeout(struct socket *sock, int level,
354        int optname, char __user *optval, unsigned int optlen)
355{
356    struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
357    struct timeval ktime;
358    mm_segment_t old_fs;
359    int err;
360
361    if (optlen < sizeof(*up))
362        return -EINVAL;
363    if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
364        __get_user(ktime.tv_sec, &up->tv_sec) ||
365        __get_user(ktime.tv_usec, &up->tv_usec))
366        return -EFAULT;
367    old_fs = get_fs();
368    set_fs(KERNEL_DS);
369    err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
370    set_fs(old_fs);
371
372    return err;
373}
374
375static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
376                char __user *optval, unsigned int optlen)
377{
378    if (optname == SO_ATTACH_FILTER)
379        return do_set_attach_filter(sock, level, optname,
380                        optval, optlen);
381    if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
382        return do_set_sock_timeout(sock, level, optname, optval, optlen);
383
384    return sock_setsockopt(sock, level, optname, optval, optlen);
385}
386
387COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
388               char __user *, optval, unsigned int, optlen)
389{
390    int err;
391    struct socket *sock = sockfd_lookup(fd, &err);
392
393    if (sock) {
394        err = security_socket_setsockopt(sock, level, optname);
395        if (err) {
396            sockfd_put(sock);
397            return err;
398        }
399
400        if (level == SOL_SOCKET)
401            err = compat_sock_setsockopt(sock, level,
402                    optname, optval, optlen);
403        else if (sock->ops->compat_setsockopt)
404            err = sock->ops->compat_setsockopt(sock, level,
405                    optname, optval, optlen);
406        else
407            err = sock->ops->setsockopt(sock, level,
408                    optname, optval, optlen);
409        sockfd_put(sock);
410    }
411    return err;
412}
413
414static int do_get_sock_timeout(struct socket *sock, int level, int optname,
415        char __user *optval, int __user *optlen)
416{
417    struct compat_timeval __user *up;
418    struct timeval ktime;
419    mm_segment_t old_fs;
420    int len, err;
421
422    up = (struct compat_timeval __user *) optval;
423    if (get_user(len, optlen))
424        return -EFAULT;
425    if (len < sizeof(*up))
426        return -EINVAL;
427    len = sizeof(ktime);
428    old_fs = get_fs();
429    set_fs(KERNEL_DS);
430    err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
431    set_fs(old_fs);
432
433    if (!err) {
434        if (put_user(sizeof(*up), optlen) ||
435            !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
436            __put_user(ktime.tv_sec, &up->tv_sec) ||
437            __put_user(ktime.tv_usec, &up->tv_usec))
438            err = -EFAULT;
439    }
440    return err;
441}
442
443static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
444                char __user *optval, int __user *optlen)
445{
446    if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
447        return do_get_sock_timeout(sock, level, optname, optval, optlen);
448    return sock_getsockopt(sock, level, optname, optval, optlen);
449}
450
451int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
452{
453    struct compat_timeval __user *ctv;
454    int err;
455    struct timeval tv;
456
457    if (COMPAT_USE_64BIT_TIME)
458        return sock_get_timestamp(sk, userstamp);
459
460    ctv = (struct compat_timeval __user *) userstamp;
461    err = -ENOENT;
462    if (!sock_flag(sk, SOCK_TIMESTAMP))
463        sock_enable_timestamp(sk, SOCK_TIMESTAMP);
464    tv = ktime_to_timeval(sk->sk_stamp);
465    if (tv.tv_sec == -1)
466        return err;
467    if (tv.tv_sec == 0) {
468        sk->sk_stamp = ktime_get_real();
469        tv = ktime_to_timeval(sk->sk_stamp);
470    }
471    err = 0;
472    if (put_user(tv.tv_sec, &ctv->tv_sec) ||
473            put_user(tv.tv_usec, &ctv->tv_usec))
474        err = -EFAULT;
475    return err;
476}
477EXPORT_SYMBOL(compat_sock_get_timestamp);
478
479int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
480{
481    struct compat_timespec __user *ctv;
482    int err;
483    struct timespec ts;
484
485    if (COMPAT_USE_64BIT_TIME)
486        return sock_get_timestampns (sk, userstamp);
487
488    ctv = (struct compat_timespec __user *) userstamp;
489    err = -ENOENT;
490    if (!sock_flag(sk, SOCK_TIMESTAMP))
491        sock_enable_timestamp(sk, SOCK_TIMESTAMP);
492    ts = ktime_to_timespec(sk->sk_stamp);
493    if (ts.tv_sec == -1)
494        return err;
495    if (ts.tv_sec == 0) {
496        sk->sk_stamp = ktime_get_real();
497        ts = ktime_to_timespec(sk->sk_stamp);
498    }
499    err = 0;
500    if (put_user(ts.tv_sec, &ctv->tv_sec) ||
501            put_user(ts.tv_nsec, &ctv->tv_nsec))
502        err = -EFAULT;
503    return err;
504}
505EXPORT_SYMBOL(compat_sock_get_timestampns);
506
507COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
508               char __user *, optval, int __user *, optlen)
509{
510    int err;
511    struct socket *sock = sockfd_lookup(fd, &err);
512
513    if (sock) {
514        err = security_socket_getsockopt(sock, level, optname);
515        if (err) {
516            sockfd_put(sock);
517            return err;
518        }
519
520        if (level == SOL_SOCKET)
521            err = compat_sock_getsockopt(sock, level,
522                    optname, optval, optlen);
523        else if (sock->ops->compat_getsockopt)
524            err = sock->ops->compat_getsockopt(sock, level,
525                    optname, optval, optlen);
526        else
527            err = sock->ops->getsockopt(sock, level,
528                    optname, optval, optlen);
529        sockfd_put(sock);
530    }
531    return err;
532}
533
534struct compat_group_req {
535    __u32 gr_interface;
536    struct __kernel_sockaddr_storage gr_group
537        __attribute__ ((aligned(4)));
538} __packed;
539
540struct compat_group_source_req {
541    __u32 gsr_interface;
542    struct __kernel_sockaddr_storage gsr_group
543        __attribute__ ((aligned(4)));
544    struct __kernel_sockaddr_storage gsr_source
545        __attribute__ ((aligned(4)));
546} __packed;
547
548struct compat_group_filter {
549    __u32 gf_interface;
550    struct __kernel_sockaddr_storage gf_group
551        __attribute__ ((aligned(4)));
552    __u32 gf_fmode;
553    __u32 gf_numsrc;
554    struct __kernel_sockaddr_storage gf_slist[1]
555        __attribute__ ((aligned(4)));
556} __packed;
557
558#define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
559            sizeof(struct __kernel_sockaddr_storage))
560
561
562int compat_mc_setsockopt(struct sock *sock, int level, int optname,
563    char __user *optval, unsigned int optlen,
564    int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
565{
566    char __user *koptval = optval;
567    int koptlen = optlen;
568
569    switch (optname) {
570    case MCAST_JOIN_GROUP:
571    case MCAST_LEAVE_GROUP:
572    {
573        struct compat_group_req __user *gr32 = (void *)optval;
574        struct group_req __user *kgr =
575            compat_alloc_user_space(sizeof(struct group_req));
576        u32 interface;
577
578        if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
579            !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
580            __get_user(interface, &gr32->gr_interface) ||
581            __put_user(interface, &kgr->gr_interface) ||
582            copy_in_user(&kgr->gr_group, &gr32->gr_group,
583                sizeof(kgr->gr_group)))
584            return -EFAULT;
585        koptval = (char __user *)kgr;
586        koptlen = sizeof(struct group_req);
587        break;
588    }
589    case MCAST_JOIN_SOURCE_GROUP:
590    case MCAST_LEAVE_SOURCE_GROUP:
591    case MCAST_BLOCK_SOURCE:
592    case MCAST_UNBLOCK_SOURCE:
593    {
594        struct compat_group_source_req __user *gsr32 = (void *)optval;
595        struct group_source_req __user *kgsr = compat_alloc_user_space(
596            sizeof(struct group_source_req));
597        u32 interface;
598
599        if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
600            !access_ok(VERIFY_WRITE, kgsr,
601            sizeof(struct group_source_req)) ||
602            __get_user(interface, &gsr32->gsr_interface) ||
603            __put_user(interface, &kgsr->gsr_interface) ||
604            copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
605                sizeof(kgsr->gsr_group)) ||
606            copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
607                sizeof(kgsr->gsr_source)))
608            return -EFAULT;
609        koptval = (char __user *)kgsr;
610        koptlen = sizeof(struct group_source_req);
611        break;
612    }
613    case MCAST_MSFILTER:
614    {
615        struct compat_group_filter __user *gf32 = (void *)optval;
616        struct group_filter __user *kgf;
617        u32 interface, fmode, numsrc;
618
619        if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
620            __get_user(interface, &gf32->gf_interface) ||
621            __get_user(fmode, &gf32->gf_fmode) ||
622            __get_user(numsrc, &gf32->gf_numsrc))
623            return -EFAULT;
624        koptlen = optlen + sizeof(struct group_filter) -
625                sizeof(struct compat_group_filter);
626        if (koptlen < GROUP_FILTER_SIZE(numsrc))
627            return -EINVAL;
628        kgf = compat_alloc_user_space(koptlen);
629        if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
630            __put_user(interface, &kgf->gf_interface) ||
631            __put_user(fmode, &kgf->gf_fmode) ||
632            __put_user(numsrc, &kgf->gf_numsrc) ||
633            copy_in_user(&kgf->gf_group, &gf32->gf_group,
634                sizeof(kgf->gf_group)) ||
635            (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
636                numsrc * sizeof(kgf->gf_slist[0]))))
637            return -EFAULT;
638        koptval = (char __user *)kgf;
639        break;
640    }
641
642    default:
643        break;
644    }
645    return setsockopt(sock, level, optname, koptval, koptlen);
646}
647EXPORT_SYMBOL(compat_mc_setsockopt);
648
649int compat_mc_getsockopt(struct sock *sock, int level, int optname,
650    char __user *optval, int __user *optlen,
651    int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
652{
653    struct compat_group_filter __user *gf32 = (void *)optval;
654    struct group_filter __user *kgf;
655    int __user *koptlen;
656    u32 interface, fmode, numsrc;
657    int klen, ulen, err;
658
659    if (optname != MCAST_MSFILTER)
660        return getsockopt(sock, level, optname, optval, optlen);
661
662    koptlen = compat_alloc_user_space(sizeof(*koptlen));
663    if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
664        __get_user(ulen, optlen))
665        return -EFAULT;
666
667    /* adjust len for pad */
668    klen = ulen + sizeof(*kgf) - sizeof(*gf32);
669
670    if (klen < GROUP_FILTER_SIZE(0))
671        return -EINVAL;
672
673    if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
674        __put_user(klen, koptlen))
675        return -EFAULT;
676
677    /* have to allow space for previous compat_alloc_user_space, too */
678    kgf = compat_alloc_user_space(klen+sizeof(*optlen));
679
680    if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
681        __get_user(interface, &gf32->gf_interface) ||
682        __get_user(fmode, &gf32->gf_fmode) ||
683        __get_user(numsrc, &gf32->gf_numsrc) ||
684        __put_user(interface, &kgf->gf_interface) ||
685        __put_user(fmode, &kgf->gf_fmode) ||
686        __put_user(numsrc, &kgf->gf_numsrc) ||
687        copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
688        return -EFAULT;
689
690    err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
691    if (err)
692        return err;
693
694    if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
695        __get_user(klen, koptlen))
696        return -EFAULT;
697
698    ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
699
700    if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
701        __put_user(ulen, optlen))
702        return -EFAULT;
703
704    if (!access_ok(VERIFY_READ, kgf, klen) ||
705        !access_ok(VERIFY_WRITE, gf32, ulen) ||
706        __get_user(interface, &kgf->gf_interface) ||
707        __get_user(fmode, &kgf->gf_fmode) ||
708        __get_user(numsrc, &kgf->gf_numsrc) ||
709        __put_user(interface, &gf32->gf_interface) ||
710        __put_user(fmode, &gf32->gf_fmode) ||
711        __put_user(numsrc, &gf32->gf_numsrc))
712        return -EFAULT;
713    if (numsrc) {
714        int copylen;
715
716        klen -= GROUP_FILTER_SIZE(0);
717        copylen = numsrc * sizeof(gf32->gf_slist[0]);
718        if (copylen > klen)
719            copylen = klen;
720        if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
721            return -EFAULT;
722    }
723    return err;
724}
725EXPORT_SYMBOL(compat_mc_getsockopt);
726
727
728/* Argument list sizes for compat_sys_socketcall */
729#define AL(x) ((x) * sizeof(u32))
730static unsigned char nas[21] = {
731    AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
732    AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
733    AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
734    AL(4), AL(5), AL(4)
735};
736#undef AL
737
738COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
739{
740    if (flags & MSG_CMSG_COMPAT)
741        return -EINVAL;
742    return __sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
743}
744
745COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
746               unsigned int, vlen, unsigned int, flags)
747{
748    if (flags & MSG_CMSG_COMPAT)
749        return -EINVAL;
750    return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
751                  flags | MSG_CMSG_COMPAT);
752}
753
754COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
755{
756    if (flags & MSG_CMSG_COMPAT)
757        return -EINVAL;
758    return __sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
759}
760
761COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags)
762{
763    return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
764}
765
766COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len,
767               unsigned int, flags, struct sockaddr __user *, addr,
768               int __user *, addrlen)
769{
770    return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
771}
772
773COMPAT_SYSCALL_DEFINE5(recvmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
774               unsigned int, vlen, unsigned int, flags,
775               struct compat_timespec __user *, timeout)
776{
777    int datagrams;
778    struct timespec ktspec;
779
780    if (flags & MSG_CMSG_COMPAT)
781        return -EINVAL;
782
783    if (timeout == NULL)
784        return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
785                      flags | MSG_CMSG_COMPAT, NULL);
786
787    if (compat_get_timespec(&ktspec, timeout))
788        return -EFAULT;
789
790    datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
791                   flags | MSG_CMSG_COMPAT, &ktspec);
792    if (datagrams > 0 && compat_put_timespec(&ktspec, timeout))
793        datagrams = -EFAULT;
794
795    return datagrams;
796}
797
798COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
799{
800    int ret;
801    u32 a[6];
802    u32 a0, a1;
803
804    if (call < SYS_SOCKET || call > SYS_SENDMMSG)
805        return -EINVAL;
806    if (copy_from_user(a, args, nas[call]))
807        return -EFAULT;
808    a0 = a[0];
809    a1 = a[1];
810
811    switch (call) {
812    case SYS_SOCKET:
813        ret = sys_socket(a0, a1, a[2]);
814        break;
815    case SYS_BIND:
816        ret = sys_bind(a0, compat_ptr(a1), a[2]);
817        break;
818    case SYS_CONNECT:
819        ret = sys_connect(a0, compat_ptr(a1), a[2]);
820        break;
821    case SYS_LISTEN:
822        ret = sys_listen(a0, a1);
823        break;
824    case SYS_ACCEPT:
825        ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
826        break;
827    case SYS_GETSOCKNAME:
828        ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
829        break;
830    case SYS_GETPEERNAME:
831        ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
832        break;
833    case SYS_SOCKETPAIR:
834        ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
835        break;
836    case SYS_SEND:
837        ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
838        break;
839    case SYS_SENDTO:
840        ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
841        break;
842    case SYS_RECV:
843        ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
844        break;
845    case SYS_RECVFROM:
846        ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
847                      compat_ptr(a[4]), compat_ptr(a[5]));
848        break;
849    case SYS_SHUTDOWN:
850        ret = sys_shutdown(a0, a1);
851        break;
852    case SYS_SETSOCKOPT:
853        ret = compat_sys_setsockopt(a0, a1, a[2],
854                compat_ptr(a[3]), a[4]);
855        break;
856    case SYS_GETSOCKOPT:
857        ret = compat_sys_getsockopt(a0, a1, a[2],
858                compat_ptr(a[3]), compat_ptr(a[4]));
859        break;
860    case SYS_SENDMSG:
861        ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
862        break;
863    case SYS_SENDMMSG:
864        ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
865        break;
866    case SYS_RECVMSG:
867        ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
868        break;
869    case SYS_RECVMMSG:
870        ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
871                      compat_ptr(a[4]));
872        break;
873    case SYS_ACCEPT4:
874        ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
875        break;
876    default:
877        ret = -EINVAL;
878        break;
879    }
880    return ret;
881}
882

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