2 * 32bit Socket syscall emulation. Based on arch/sparc64/kernel/sys_sparc32.c.
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
14 #include <linux/kernel.h>
16 #include <linux/types.h>
17 #include <linux/file.h>
18 #include <linux/icmpv6.h>
19 #include <linux/socket.h>
20 #include <linux/syscalls.h>
21 #include <linux/filter.h>
22 #include <linux/compat.h>
23 #include <linux/netfilter_ipv4/ip_tables.h>
24 #include <linux/security.h>
28 #include <asm/uaccess.h>
29 #include <net/compat.h>
31 static inline int iov_from_user_compat_to_kern(struct iovec *kiov,
32 struct compat_iovec __user *uiov32,
41 if (get_user(len, &uiov32->iov_len) ||
42 get_user(buf, &uiov32->iov_base)) {
47 kiov->iov_base = compat_ptr(buf);
48 kiov->iov_len = (__kernel_size_t) len;
56 int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg)
58 compat_uptr_t tmp1, tmp2, tmp3;
60 if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
61 __get_user(tmp1, &umsg->msg_name) ||
62 __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
63 __get_user(tmp2, &umsg->msg_iov) ||
64 __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) ||
65 __get_user(tmp3, &umsg->msg_control) ||
66 __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
67 __get_user(kmsg->msg_flags, &umsg->msg_flags))
69 kmsg->msg_name = compat_ptr(tmp1);
70 kmsg->msg_iov = compat_ptr(tmp2);
71 kmsg->msg_control = compat_ptr(tmp3);
75 /* I've named the args so it is easy to tell whose space the pointers are in. */
76 int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov,
77 char *kern_address, int mode)
81 if (kern_msg->msg_namelen) {
82 if (mode==VERIFY_READ) {
83 int err = move_addr_to_kernel(kern_msg->msg_name,
84 kern_msg->msg_namelen,
89 kern_msg->msg_name = kern_address;
91 kern_msg->msg_name = NULL;
93 tot_len = iov_from_user_compat_to_kern(kern_iov,
94 (struct compat_iovec __user *)kern_msg->msg_iov,
95 kern_msg->msg_iovlen);
97 kern_msg->msg_iov = kern_iov;
103 #define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32))
105 #define CMSG_COMPAT_DATA(cmsg) \
106 ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
107 #define CMSG_COMPAT_SPACE(len) \
108 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
109 #define CMSG_COMPAT_LEN(len) \
110 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
112 #define CMSG_COMPAT_FIRSTHDR(msg) \
113 (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \
114 (struct compat_cmsghdr __user *)((msg)->msg_control) : \
115 (struct compat_cmsghdr __user *)NULL)
117 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
118 ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
119 (ucmlen) <= (unsigned long) \
120 ((mhdr)->msg_controllen - \
121 ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
123 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
124 struct compat_cmsghdr __user *cmsg, int cmsg_len)
126 char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
127 if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
130 return (struct compat_cmsghdr __user *)ptr;
133 /* There is a lot of hair here because the alignment rules (and
134 * thus placement) of cmsg headers and length are different for
135 * 32-bit apps. -DaveM
137 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
138 unsigned char *stackbuf, int stackbuf_size)
140 struct compat_cmsghdr __user *ucmsg;
141 struct cmsghdr *kcmsg, *kcmsg_base;
142 compat_size_t ucmlen;
143 __kernel_size_t kcmlen, tmp;
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))
154 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
157 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
158 CMSG_ALIGN(sizeof(struct cmsghdr)));
159 tmp = CMSG_ALIGN(tmp);
161 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
166 /* The kcmlen holds the 64-bit version of the control length.
167 * It may not be modified as we do not stick it into the kmsg
168 * until we have successfully copied over all of the data
171 if (kcmlen > stackbuf_size)
172 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
176 /* Now copy them over neatly. */
177 memset(kcmsg, 0, kcmlen);
178 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
179 while (ucmsg != NULL) {
180 if (__get_user(ucmlen, &ucmsg->cmsg_len))
182 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
184 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
185 CMSG_ALIGN(sizeof(struct cmsghdr)));
186 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
188 kcmsg->cmsg_len = tmp;
189 tmp = CMSG_ALIGN(tmp);
190 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
191 __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
192 copy_from_user(CMSG_DATA(kcmsg),
193 CMSG_COMPAT_DATA(ucmsg),
194 (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
198 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
199 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
202 /* Ok, looks like we made it. Hook it up and return success. */
203 kmsg->msg_control = kcmsg_base;
204 kmsg->msg_controllen = kcmlen;
210 if (kcmsg_base != (struct cmsghdr *)stackbuf)
211 sock_kfree_s(sk, kcmsg_base, kcmlen);
215 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
217 struct compat_timeval ctv;
218 struct compat_timespec cts;
219 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
220 struct compat_cmsghdr cmhdr;
223 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
224 kmsg->msg_flags |= MSG_CTRUNC;
225 return 0; /* XXX: return error? check spec. */
228 if (level == SOL_SOCKET && type == SO_TIMESTAMP) {
229 struct timeval *tv = (struct timeval *)data;
230 ctv.tv_sec = tv->tv_sec;
231 ctv.tv_usec = tv->tv_usec;
235 if (level == SOL_SOCKET && type == SO_TIMESTAMPNS) {
236 struct timespec *ts = (struct timespec *)data;
237 cts.tv_sec = ts->tv_sec;
238 cts.tv_nsec = ts->tv_nsec;
243 cmlen = CMSG_COMPAT_LEN(len);
244 if (kmsg->msg_controllen < cmlen) {
245 kmsg->msg_flags |= MSG_CTRUNC;
246 cmlen = kmsg->msg_controllen;
248 cmhdr.cmsg_level = level;
249 cmhdr.cmsg_type = type;
250 cmhdr.cmsg_len = cmlen;
252 if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
254 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
256 cmlen = CMSG_COMPAT_SPACE(len);
257 if (kmsg->msg_controllen < cmlen)
258 cmlen = kmsg->msg_controllen;
259 kmsg->msg_control += cmlen;
260 kmsg->msg_controllen -= cmlen;
264 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
266 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
267 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
268 int fdnum = scm->fp->count;
269 struct file **fp = scm->fp->fp;
276 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
278 err = security_file_receive(fp[i]);
281 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
286 err = put_user(new_fd, cmfptr);
288 put_unused_fd(new_fd);
291 /* Bump the usage count and install the file. */
293 fd_install(new_fd, fp[i]);
297 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
298 err = put_user(SOL_SOCKET, &cm->cmsg_level);
300 err = put_user(SCM_RIGHTS, &cm->cmsg_type);
302 err = put_user(cmlen, &cm->cmsg_len);
304 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
305 kmsg->msg_control += cmlen;
306 kmsg->msg_controllen -= cmlen;
310 kmsg->msg_flags |= MSG_CTRUNC;
313 * All of the files that fit in the message have had their
314 * usage counts incremented, so we just free the list.
320 * For now, we assume that the compatibility and native version
321 * of struct ipt_entry are the same - sfr. FIXME
323 struct compat_ipt_replace {
324 char name[IPT_TABLE_MAXNAMELEN];
328 u32 hook_entry[NF_IP_NUMHOOKS];
329 u32 underflow[NF_IP_NUMHOOKS];
331 compat_uptr_t counters; /* struct ipt_counters * */
332 struct ipt_entry entries[0];
335 static int do_netfilter_replace(int fd, int level, int optname,
336 char __user *optval, int optlen)
338 struct compat_ipt_replace __user *urepl;
339 struct ipt_replace __user *repl_nat;
340 char name[IPT_TABLE_MAXNAMELEN];
341 u32 origsize, tmp32, num_counters;
342 unsigned int repl_nat_size;
345 compat_uptr_t ucntrs;
347 urepl = (struct compat_ipt_replace __user *)optval;
348 if (get_user(origsize, &urepl->size))
351 /* Hack: Causes ipchains to give correct error msg --RR */
352 if (optlen != sizeof(*urepl) + origsize)
355 /* XXX Assumes that size of ipt_entry is the same both in
356 * native and compat environments.
358 repl_nat_size = sizeof(*repl_nat) + origsize;
359 repl_nat = compat_alloc_user_space(repl_nat_size);
362 if (put_user(origsize, &repl_nat->size))
365 if (!access_ok(VERIFY_READ, urepl, optlen) ||
366 !access_ok(VERIFY_WRITE, repl_nat, optlen))
369 if (__copy_from_user(name, urepl->name, sizeof(urepl->name)) ||
370 __copy_to_user(repl_nat->name, name, sizeof(repl_nat->name)))
373 if (__get_user(tmp32, &urepl->valid_hooks) ||
374 __put_user(tmp32, &repl_nat->valid_hooks))
377 if (__get_user(tmp32, &urepl->num_entries) ||
378 __put_user(tmp32, &repl_nat->num_entries))
381 if (__get_user(num_counters, &urepl->num_counters) ||
382 __put_user(num_counters, &repl_nat->num_counters))
385 if (__get_user(ucntrs, &urepl->counters) ||
386 __put_user(compat_ptr(ucntrs), &repl_nat->counters))
389 if (__copy_in_user(&repl_nat->entries[0],
394 for (i = 0; i < NF_IP_NUMHOOKS; i++) {
395 if (__get_user(tmp32, &urepl->hook_entry[i]) ||
396 __put_user(tmp32, &repl_nat->hook_entry[i]) ||
397 __get_user(tmp32, &urepl->underflow[i]) ||
398 __put_user(tmp32, &repl_nat->underflow[i]))
403 * Since struct ipt_counters just contains two u_int64_t members
404 * we can just do the access_ok check here and pass the (converted)
405 * pointer into the standard syscall. We hope that the pointer is
408 if (!access_ok(VERIFY_WRITE, compat_ptr(ucntrs),
409 num_counters * sizeof(struct ipt_counters)))
413 ret = sys_setsockopt(fd, level, optname,
414 (char __user *)repl_nat, repl_nat_size);
421 * A struct sock_filter is architecture independent.
423 struct compat_sock_fprog {
425 compat_uptr_t filter; /* struct sock_filter * */
428 static int do_set_attach_filter(struct socket *sock, int level, int optname,
429 char __user *optval, int optlen)
431 struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
432 struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
436 if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
437 !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
438 __get_user(len, &fprog32->len) ||
439 __get_user(ptr, &fprog32->filter) ||
440 __put_user(len, &kfprog->len) ||
441 __put_user(compat_ptr(ptr), &kfprog->filter))
444 return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
445 sizeof(struct sock_fprog));
448 static int do_set_sock_timeout(struct socket *sock, int level,
449 int optname, char __user *optval, int optlen)
451 struct compat_timeval __user *up = (struct compat_timeval __user *) optval;
452 struct timeval ktime;
456 if (optlen < sizeof(*up))
458 if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
459 __get_user(ktime.tv_sec, &up->tv_sec) ||
460 __get_user(ktime.tv_usec, &up->tv_usec))
464 err = sock_setsockopt(sock, level, optname, (char *) &ktime, sizeof(ktime));
470 static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
471 char __user *optval, int optlen)
473 if (optname == SO_ATTACH_FILTER)
474 return do_set_attach_filter(sock, level, optname,
476 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
477 return do_set_sock_timeout(sock, level, optname, optval, optlen);
479 return sock_setsockopt(sock, level, optname, optval, optlen);
482 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
483 char __user *optval, int optlen)
488 if (level == SOL_IPV6 && optname == IPT_SO_SET_REPLACE)
489 return do_netfilter_replace(fd, level, optname,
495 if ((sock = sockfd_lookup(fd, &err))!=NULL)
497 err = security_socket_setsockopt(sock,level,optname);
503 if (level == SOL_SOCKET)
504 err = compat_sock_setsockopt(sock, level,
505 optname, optval, optlen);
506 else if (sock->ops->compat_setsockopt)
507 err = sock->ops->compat_setsockopt(sock, level,
508 optname, optval, optlen);
510 err = sock->ops->setsockopt(sock, level,
511 optname, optval, optlen);
517 static int do_get_sock_timeout(struct socket *sock, int level, int optname,
518 char __user *optval, int __user *optlen)
520 struct compat_timeval __user *up;
521 struct timeval ktime;
525 up = (struct compat_timeval __user *) optval;
526 if (get_user(len, optlen))
528 if (len < sizeof(*up))
533 err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
537 if (put_user(sizeof(*up), optlen) ||
538 !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
539 __put_user(ktime.tv_sec, &up->tv_sec) ||
540 __put_user(ktime.tv_usec, &up->tv_usec))
546 static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
547 char __user *optval, int __user *optlen)
549 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
550 return do_get_sock_timeout(sock, level, optname, optval, optlen);
551 return sock_getsockopt(sock, level, optname, optval, optlen);
554 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
556 struct compat_timeval __user *ctv =
557 (struct compat_timeval __user*) userstamp;
561 if (!sock_flag(sk, SOCK_TIMESTAMP))
562 sock_enable_timestamp(sk);
563 tv = ktime_to_timeval(sk->sk_stamp);
566 if (tv.tv_sec == 0) {
567 sk->sk_stamp = ktime_get_real();
568 tv = ktime_to_timeval(sk->sk_stamp);
571 if (put_user(tv.tv_sec, &ctv->tv_sec) ||
572 put_user(tv.tv_usec, &ctv->tv_usec))
576 EXPORT_SYMBOL(compat_sock_get_timestamp);
578 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
580 struct compat_timespec __user *ctv =
581 (struct compat_timespec __user*) userstamp;
585 if (!sock_flag(sk, SOCK_TIMESTAMP))
586 sock_enable_timestamp(sk);
587 ts = ktime_to_timespec(sk->sk_stamp);
590 if (ts.tv_sec == 0) {
591 sk->sk_stamp = ktime_get_real();
592 ts = ktime_to_timespec(sk->sk_stamp);
595 if (put_user(ts.tv_sec, &ctv->tv_sec) ||
596 put_user(ts.tv_nsec, &ctv->tv_nsec))
600 EXPORT_SYMBOL(compat_sock_get_timestampns);
602 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
603 char __user *optval, int __user *optlen)
608 if ((sock = sockfd_lookup(fd, &err))!=NULL)
610 err = security_socket_getsockopt(sock, level,
617 if (level == SOL_SOCKET)
618 err = compat_sock_getsockopt(sock, level,
619 optname, optval, optlen);
620 else if (sock->ops->compat_getsockopt)
621 err = sock->ops->compat_getsockopt(sock, level,
622 optname, optval, optlen);
624 err = sock->ops->getsockopt(sock, level,
625 optname, optval, optlen);
630 /* Argument list sizes for compat_sys_socketcall */
631 #define AL(x) ((x) * sizeof(u32))
632 static unsigned char nas[18]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3),
633 AL(3),AL(3),AL(4),AL(4),AL(4),AL(6),
634 AL(6),AL(2),AL(5),AL(5),AL(3),AL(3)};
637 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags)
639 return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
642 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
644 return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
647 asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
653 if (call < SYS_SOCKET || call > SYS_RECVMSG)
655 if (copy_from_user(a, args, nas[call]))
662 ret = sys_socket(a0, a1, a[2]);
665 ret = sys_bind(a0, compat_ptr(a1), a[2]);
668 ret = sys_connect(a0, compat_ptr(a1), a[2]);
671 ret = sys_listen(a0, a1);
674 ret = sys_accept(a0, compat_ptr(a1), compat_ptr(a[2]));
676 case SYS_GETSOCKNAME:
677 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
679 case SYS_GETPEERNAME:
680 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
683 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
686 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
689 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
692 ret = sys_recv(a0, compat_ptr(a1), a[2], a[3]);
695 ret = sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), compat_ptr(a[5]));
698 ret = sys_shutdown(a0,a1);
701 ret = compat_sys_setsockopt(a0, a1, a[2],
702 compat_ptr(a[3]), a[4]);
705 ret = compat_sys_getsockopt(a0, a1, a[2],
706 compat_ptr(a[3]), compat_ptr(a[4]));
709 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
712 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);