/*
 * 32bit Socket syscall emulation. Based on arch/sparc64/kernel/sys_sparc32.c.
 *
 * Copyright (C) 2000           VA Linux Co
 * Copyright (C) 2000           Don Dugger <n0ano@valinux.com>
 * Copyright (C) 1999           Arun Sharma <arun.sharma@intel.com>
 * Copyright (C) 1997,1998      Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 * Copyright (C) 1997           David S. Miller (davem@caip.rutgers.edu)
 * Copyright (C) 2000           Hewlett-Packard Co.
 * Copyright (C) 2000           David Mosberger-Tang <davidm@hpl.hp.com>
 * Copyright (C) 2000,2001      Andi Kleen, SuSE Labs
 */

#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/file.h>
#include <linux/icmpv6.h>
#include <linux/socket.h>
#include <linux/syscalls.h>
#include <linux/filter.h>
#include <linux/compat.h>
#include <linux/security.h>

#include <net/scm.h>
#include <net/sock.h>
#include <net/ip.h>
#include <net/ipv6.h>
#include <asm/uaccess.h>
#include <net/compat.h>

static inline int iov_from_user_compat_to_kern(struct iovec *kiov,
                                          struct compat_iovec __user *uiov32,
                                          int niov)
{
        int tot_len = 0;

        while (niov > 0) {
                compat_uptr_t buf;
                compat_size_t len;

                if (get_user(len, &uiov32->iov_len) ||
                   get_user(buf, &uiov32->iov_base)) {
                        tot_len = -EFAULT;
                        break;
                }
                tot_len += len;
                kiov->iov_base = compat_ptr(buf);
                kiov->iov_len = (__kernel_size_t) len;
                uiov32++;
                kiov++;
                niov--;
        }
        return tot_len;
}

int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg)
{
        compat_uptr_t tmp1, tmp2, tmp3;

        if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
            __get_user(tmp1, &umsg->msg_name) ||
            __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
            __get_user(tmp2, &umsg->msg_iov) ||
            __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) ||
            __get_user(tmp3, &umsg->msg_control) ||
            __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
            __get_user(kmsg->msg_flags, &umsg->msg_flags))
                return -EFAULT;
        kmsg->msg_name = compat_ptr(tmp1);
        kmsg->msg_iov = compat_ptr(tmp2);
        kmsg->msg_control = compat_ptr(tmp3);
        return 0;
}

/* I've named the args so it is easy to tell whose space the pointers are in. */
int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov,
                   struct sockaddr *kern_address, int mode)
{
        int tot_len;

        if (kern_msg->msg_namelen) {
                if (mode==VERIFY_READ) {
                        int err = move_addr_to_kernel(kern_msg->msg_name,
                                                      kern_msg->msg_namelen,
                                                      kern_address);
                        if (err < 0)
                                return err;
                }
                kern_msg->msg_name = kern_address;
        } else
                kern_msg->msg_name = NULL;

        tot_len = iov_from_user_compat_to_kern(kern_iov,
                                          (struct compat_iovec __user *)kern_msg->msg_iov,
                                          kern_msg->msg_iovlen);
        if (tot_len >= 0)
                kern_msg->msg_iov = kern_iov;

        return tot_len;
}

/* Bleech... */
#define CMSG_COMPAT_ALIGN(len)  ALIGN((len), sizeof(s32))

#define CMSG_COMPAT_DATA(cmsg)                          \
        ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
#define CMSG_COMPAT_SPACE(len)                          \
        (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
#define CMSG_COMPAT_LEN(len)                            \
        (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))

#define CMSG_COMPAT_FIRSTHDR(msg)                       \
        (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ?     \
         (struct compat_cmsghdr __user *)((msg)->msg_control) :         \
         (struct compat_cmsghdr __user *)NULL)

#define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
        ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
         (ucmlen) <= (unsigned long) \
         ((mhdr)->msg_controllen - \
          ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))

static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
                struct compat_cmsghdr __user *cmsg, int cmsg_len)
{
        char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
        if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
                        msg->msg_controllen)
                return NULL;
        return (struct compat_cmsghdr __user *)ptr;
}

/* There is a lot of hair here because the alignment rules (and
 * thus placement) of cmsg headers and length are different for
 * 32-bit apps.  -DaveM
 */
int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
                               unsigned char *stackbuf, int stackbuf_size)
{
        struct compat_cmsghdr __user *ucmsg;
        struct cmsghdr *kcmsg, *kcmsg_base;
        compat_size_t ucmlen;
        __kernel_size_t kcmlen, tmp;
        int err = -EFAULT;

        kcmlen = 0;
        kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
        ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
        while (ucmsg != NULL) {
                if (get_user(ucmlen, &ucmsg->cmsg_len))
                        return -EFAULT;

                /* Catch bogons. */
                if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
                        return -EINVAL;

                tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
                       CMSG_ALIGN(sizeof(struct cmsghdr)));
                tmp = CMSG_ALIGN(tmp);
                kcmlen += tmp;
                ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
        }
        if (kcmlen == 0)
                return -EINVAL;

        /* The kcmlen holds the 64-bit version of the control length.
         * It may not be modified as we do not stick it into the kmsg
         * until we have successfully copied over all of the data
         * from the user.
         */
        if (kcmlen > stackbuf_size)
                kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
        if (kcmsg == NULL)
                return -ENOBUFS;

        /* Now copy them over neatly. */
        memset(kcmsg, 0, kcmlen);
        ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
        while (ucmsg != NULL) {
                if (__get_user(ucmlen, &ucmsg->cmsg_len))
                        goto Efault;
                if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
                        goto Einval;
                tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
                       CMSG_ALIGN(sizeof(struct cmsghdr)));
                if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
                        goto Einval;
                kcmsg->cmsg_len = tmp;
                tmp = CMSG_ALIGN(tmp);
                if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
                    __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
                    copy_from_user(CMSG_DATA(kcmsg),
                                   CMSG_COMPAT_DATA(ucmsg),
                                   (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
                        goto Efault;

                /* Advance. */
                kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
                ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
        }

        /* Ok, looks like we made it.  Hook it up and return success. */
        kmsg->msg_control = kcmsg_base;
        kmsg->msg_controllen = kcmlen;
        return 0;

Einval:
        err = -EINVAL;
Efault:
        if (kcmsg_base != (struct cmsghdr *)stackbuf)
                sock_kfree_s(sk, kcmsg_base, kcmlen);
        return err;
}

int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
{
        struct compat_timeval ctv;
        struct compat_timespec cts;
        struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
        struct compat_cmsghdr cmhdr;
        int cmlen;

        if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
                kmsg->msg_flags |= MSG_CTRUNC;
                return 0; /* XXX: return error? check spec. */
        }

        if (level == SOL_SOCKET && type == SO_TIMESTAMP) {
                struct timeval *tv = (struct timeval *)data;
                ctv.tv_sec = tv->tv_sec;
                ctv.tv_usec = tv->tv_usec;
                data = &ctv;
                len = sizeof(ctv);
        }
        if (level == SOL_SOCKET && type == SO_TIMESTAMPNS) {
                struct timespec *ts = (struct timespec *)data;
                cts.tv_sec = ts->tv_sec;
                cts.tv_nsec = ts->tv_nsec;
                data = &cts;
                len = sizeof(cts);
        }

        cmlen = CMSG_COMPAT_LEN(len);
        if (kmsg->msg_controllen < cmlen) {
                kmsg->msg_flags |= MSG_CTRUNC;
                cmlen = kmsg->msg_controllen;
        }
        cmhdr.cmsg_level = level;
        cmhdr.cmsg_type = type;
        cmhdr.cmsg_len = cmlen;

        if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
                return -EFAULT;
        if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
                return -EFAULT;
        cmlen = CMSG_COMPAT_SPACE(len);
        if (kmsg->msg_controllen < cmlen)
                cmlen = kmsg->msg_controllen;
        kmsg->msg_control += cmlen;
        kmsg->msg_controllen -= cmlen;
        return 0;
}

void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
{
        struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
        int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
        int fdnum = scm->fp->count;
        struct file **fp = scm->fp->fp;
        int __user *cmfptr;
        int err = 0, i;

        if (fdnum < fdmax)
                fdmax = fdnum;

        for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
                int new_fd;
                err = security_file_receive(fp[i]);
                if (err)
                        break;
                err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
                                          ? O_CLOEXEC : 0);
                if (err < 0)
                        break;
                new_fd = err;
                err = put_user(new_fd, cmfptr);
                if (err) {
                        put_unused_fd(new_fd);
                        break;
                }
                /* Bump the usage count and install the file. */
                get_file(fp[i]);
                fd_install(new_fd, fp[i]);
        }

        if (i > 0) {
                int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
                err = put_user(SOL_SOCKET, &cm->cmsg_level);
                if (!err)
                        err = put_user(SCM_RIGHTS, &cm->cmsg_type);
                if (!err)
                        err = put_user(cmlen, &cm->cmsg_len);
                if (!err) {
                        cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
                        kmsg->msg_control += cmlen;
                        kmsg->msg_controllen -= cmlen;
                }
        }
        if (i < fdnum)
                kmsg->msg_flags |= MSG_CTRUNC;

        /*
         * All of the files that fit in the message have had their
         * usage counts incremented, so we just free the list.
         */
        __scm_destroy(scm);
}

/*
 * A struct sock_filter is architecture independent.
 */
struct compat_sock_fprog {
        u16             len;
        compat_uptr_t   filter;         /* struct sock_filter * */
};

static int do_set_attach_filter(struct socket *sock, int level, int optname,
                                char __user *optval, int optlen)
{
        struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
        struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
        compat_uptr_t ptr;
        u16 len;

        if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
            !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
            __get_user(len, &fprog32->len) ||
            __get_user(ptr, &fprog32->filter) ||
            __put_user(len, &kfprog->len) ||
            __put_user(compat_ptr(ptr), &kfprog->filter))
                return -EFAULT;

        return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
                              sizeof(struct sock_fprog));
}

static int do_set_sock_timeout(struct socket *sock, int level,
                int optname, char __user *optval, int optlen)
{
        struct compat_timeval __user *up = (struct compat_timeval __user *) optval;
        struct timeval ktime;
        mm_segment_t old_fs;
        int err;

        if (optlen < sizeof(*up))
                return -EINVAL;
        if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
            __get_user(ktime.tv_sec, &up->tv_sec) ||
            __get_user(ktime.tv_usec, &up->tv_usec))
                return -EFAULT;
        old_fs = get_fs();
        set_fs(KERNEL_DS);
        err = sock_setsockopt(sock, level, optname, (char *) &ktime, sizeof(ktime));
        set_fs(old_fs);

        return err;
}

static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
                                char __user *optval, int optlen)
{
        if (optname == SO_ATTACH_FILTER)
                return do_set_attach_filter(sock, level, optname,
                                            optval, optlen);
        if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
                return do_set_sock_timeout(sock, level, optname, optval, optlen);

        return sock_setsockopt(sock, level, optname, optval, optlen);
}

asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
                                char __user *optval, int optlen)
{
        int err;
        struct socket *sock;

        if (optlen < 0)
                return -EINVAL;

        if ((sock = sockfd_lookup(fd, &err))!=NULL)
        {
                err = security_socket_setsockopt(sock,level,optname);
                if (err) {
                        sockfd_put(sock);
                        return err;
                }

                if (level == SOL_SOCKET)
                        err = compat_sock_setsockopt(sock, level,
                                        optname, optval, optlen);
                else if (sock->ops->compat_setsockopt)
                        err = sock->ops->compat_setsockopt(sock, level,
                                        optname, optval, optlen);
                else
                        err = sock->ops->setsockopt(sock, level,
                                        optname, optval, optlen);
                sockfd_put(sock);
        }
        return err;
}

static int do_get_sock_timeout(struct socket *sock, int level, int optname,
                char __user *optval, int __user *optlen)
{
        struct compat_timeval __user *up;
        struct timeval ktime;
        mm_segment_t old_fs;
        int len, err;

        up = (struct compat_timeval __user *) optval;
        if (get_user(len, optlen))
                return -EFAULT;
        if (len < sizeof(*up))
                return -EINVAL;
        len = sizeof(ktime);
        old_fs = get_fs();
        set_fs(KERNEL_DS);
        err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
        set_fs(old_fs);

        if (!err) {
                if (put_user(sizeof(*up), optlen) ||
                    !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
                    __put_user(ktime.tv_sec, &up->tv_sec) ||
                    __put_user(ktime.tv_usec, &up->tv_usec))
                        err = -EFAULT;
        }
        return err;
}

static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
                                char __user *optval, int __user *optlen)
{
        if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
                return do_get_sock_timeout(sock, level, optname, optval, optlen);
        return sock_getsockopt(sock, level, optname, optval, optlen);
}

int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
{
        struct compat_timeval __user *ctv =
                        (struct compat_timeval __user*) userstamp;
        int err = -ENOENT;
        struct timeval tv;

        if (!sock_flag(sk, SOCK_TIMESTAMP))
                sock_enable_timestamp(sk);
        tv = ktime_to_timeval(sk->sk_stamp);
        if (tv.tv_sec == -1)
                return err;
        if (tv.tv_sec == 0) {
                sk->sk_stamp = ktime_get_real();
                tv = ktime_to_timeval(sk->sk_stamp);
        }
        err = 0;
        if (put_user(tv.tv_sec, &ctv->tv_sec) ||
                        put_user(tv.tv_usec, &ctv->tv_usec))
                err = -EFAULT;
        return err;
}
EXPORT_SYMBOL(compat_sock_get_timestamp);

int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
{
        struct compat_timespec __user *ctv =
                        (struct compat_timespec __user*) userstamp;
        int err = -ENOENT;
        struct timespec ts;

        if (!sock_flag(sk, SOCK_TIMESTAMP))
                sock_enable_timestamp(sk);
        ts = ktime_to_timespec(sk->sk_stamp);
        if (ts.tv_sec == -1)
                return err;
        if (ts.tv_sec == 0) {
                sk->sk_stamp = ktime_get_real();
                ts = ktime_to_timespec(sk->sk_stamp);
        }
        err = 0;
        if (put_user(ts.tv_sec, &ctv->tv_sec) ||
                        put_user(ts.tv_nsec, &ctv->tv_nsec))
                err = -EFAULT;
        return err;
}
EXPORT_SYMBOL(compat_sock_get_timestampns);

asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
                                char __user *optval, int __user *optlen)
{
        int err;
        struct socket *sock;

        if ((sock = sockfd_lookup(fd, &err))!=NULL)
        {
                err = security_socket_getsockopt(sock, level,
                                                           optname);
                if (err) {
                        sockfd_put(sock);
                        return err;
                }

                if (level == SOL_SOCKET)
                        err = compat_sock_getsockopt(sock, level,
                                        optname, optval, optlen);
                else if (sock->ops->compat_getsockopt)
                        err = sock->ops->compat_getsockopt(sock, level,
                                        optname, optval, optlen);
                else
                        err = sock->ops->getsockopt(sock, level,
                                        optname, optval, optlen);
                sockfd_put(sock);
        }
        return err;
}

struct compat_group_req {
        __u32                            gr_interface;
        struct __kernel_sockaddr_storage gr_group
                __attribute__ ((aligned(4)));
} __attribute__ ((packed));

struct compat_group_source_req {
        __u32                            gsr_interface;
        struct __kernel_sockaddr_storage gsr_group
                __attribute__ ((aligned(4)));
        struct __kernel_sockaddr_storage gsr_source
                __attribute__ ((aligned(4)));
} __attribute__ ((packed));

struct compat_group_filter {
        __u32                            gf_interface;
        struct __kernel_sockaddr_storage gf_group
                __attribute__ ((aligned(4)));
        __u32                            gf_fmode;
        __u32                            gf_numsrc;
        struct __kernel_sockaddr_storage gf_slist[1]
                __attribute__ ((aligned(4)));
} __attribute__ ((packed));

#define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
                        sizeof(struct __kernel_sockaddr_storage))


int compat_mc_setsockopt(struct sock *sock, int level, int optname,
        char __user *optval, int optlen,
        int (*setsockopt)(struct sock *,int,int,char __user *,int))
{
        char __user     *koptval = optval;
        int             koptlen = optlen;

        switch (optname) {
        case MCAST_JOIN_GROUP:
        case MCAST_LEAVE_GROUP:
        {
                struct compat_group_req __user *gr32 = (void *)optval;
                struct group_req __user *kgr =
                        compat_alloc_user_space(sizeof(struct group_req));
                u32 interface;

                if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
                    !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
                    __get_user(interface, &gr32->gr_interface) ||
                    __put_user(interface, &kgr->gr_interface) ||
                    copy_in_user(&kgr->gr_group, &gr32->gr_group,
                                sizeof(kgr->gr_group)))
                        return -EFAULT;
                koptval = (char __user *)kgr;
                koptlen = sizeof(struct group_req);
                break;
        }
        case MCAST_JOIN_SOURCE_GROUP:
        case MCAST_LEAVE_SOURCE_GROUP:
        case MCAST_BLOCK_SOURCE:
        case MCAST_UNBLOCK_SOURCE:
        {
                struct compat_group_source_req __user *gsr32 = (void *)optval;
                struct group_source_req __user *kgsr = compat_alloc_user_space(
                        sizeof(struct group_source_req));
                u32 interface;

                if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
                    !access_ok(VERIFY_WRITE, kgsr,
                        sizeof(struct group_source_req)) ||
                    __get_user(interface, &gsr32->gsr_interface) ||
                    __put_user(interface, &kgsr->gsr_interface) ||
                    copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
                                sizeof(kgsr->gsr_group)) ||
                    copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
                                sizeof(kgsr->gsr_source)))
                        return -EFAULT;
                koptval = (char __user *)kgsr;
                koptlen = sizeof(struct group_source_req);
                break;
        }
        case MCAST_MSFILTER:
        {
                struct compat_group_filter __user *gf32 = (void *)optval;
                struct group_filter __user *kgf;
                u32 interface, fmode, numsrc;

                if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
                    __get_user(interface, &gf32->gf_interface) ||
                    __get_user(fmode, &gf32->gf_fmode) ||
                    __get_user(numsrc, &gf32->gf_numsrc))
                        return -EFAULT;
                koptlen = optlen + sizeof(struct group_filter) -
                                sizeof(struct compat_group_filter);
                if (koptlen < GROUP_FILTER_SIZE(numsrc))
                        return -EINVAL;
                kgf = compat_alloc_user_space(koptlen);
                if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
                    __put_user(interface, &kgf->gf_interface) ||
                    __put_user(fmode, &kgf->gf_fmode) ||
                    __put_user(numsrc, &kgf->gf_numsrc) ||
                    copy_in_user(&kgf->gf_group, &gf32->gf_group,
                                sizeof(kgf->gf_group)) ||
                    (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
                                numsrc * sizeof(kgf->gf_slist[0]))))
                        return -EFAULT;
                koptval = (char __user *)kgf;
                break;
        }

        default:
                break;
        }
        return setsockopt(sock, level, optname, koptval, koptlen);
}

EXPORT_SYMBOL(compat_mc_setsockopt);

int compat_mc_getsockopt(struct sock *sock, int level, int optname,
        char __user *optval, int __user *optlen,
        int (*getsockopt)(struct sock *,int,int,char __user *,int __user *))
{
        struct compat_group_filter __user *gf32 = (void *)optval;
        struct group_filter __user *kgf;
        int __user      *koptlen;
        u32 interface, fmode, numsrc;
        int klen, ulen, err;

        if (optname != MCAST_MSFILTER)
                return getsockopt(sock, level, optname, optval, optlen);

        koptlen = compat_alloc_user_space(sizeof(*koptlen));
        if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
            __get_user(ulen, optlen))
                return -EFAULT;

        /* adjust len for pad */
        klen = ulen + sizeof(*kgf) - sizeof(*gf32);

        if (klen < GROUP_FILTER_SIZE(0))
                return -EINVAL;

        if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
            __put_user(klen, koptlen))
                return -EFAULT;

        /* have to allow space for previous compat_alloc_user_space, too */
        kgf = compat_alloc_user_space(klen+sizeof(*optlen));

        if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
            __get_user(interface, &gf32->gf_interface) ||
            __get_user(fmode, &gf32->gf_fmode) ||
            __get_user(numsrc, &gf32->gf_numsrc) ||
            __put_user(interface, &kgf->gf_interface) ||
            __put_user(fmode, &kgf->gf_fmode) ||
            __put_user(numsrc, &kgf->gf_numsrc) ||
            copy_in_user(&kgf->gf_group,&gf32->gf_group,sizeof(kgf->gf_group)))
                return -EFAULT;

        err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
        if (err)
                return err;

        if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
            __get_user(klen, koptlen))
                return -EFAULT;

        ulen = klen - (sizeof(*kgf)-sizeof(*gf32));

        if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
            __put_user(ulen, optlen))
                return -EFAULT;

        if (!access_ok(VERIFY_READ, kgf, klen) ||
            !access_ok(VERIFY_WRITE, gf32, ulen) ||
            __get_user(interface, &kgf->gf_interface) ||
            __get_user(fmode, &kgf->gf_fmode) ||
            __get_user(numsrc, &kgf->gf_numsrc) ||
            __put_user(interface, &gf32->gf_interface) ||
            __put_user(fmode, &gf32->gf_fmode) ||
            __put_user(numsrc, &gf32->gf_numsrc))
                return -EFAULT;
        if (numsrc) {
                int copylen;

                klen -= GROUP_FILTER_SIZE(0);
                copylen = numsrc * sizeof(gf32->gf_slist[0]);
                if (copylen > klen)
                        copylen = klen;
                if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
                        return -EFAULT;
        }
        return err;
}

EXPORT_SYMBOL(compat_mc_getsockopt);


/* Argument list sizes for compat_sys_socketcall */
#define AL(x) ((x) * sizeof(u32))
static unsigned char nas[19]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3),
                                AL(3),AL(3),AL(4),AL(4),AL(4),AL(6),
                                AL(6),AL(2),AL(5),AL(5),AL(3),AL(3),
                                AL(6)};
#undef AL

asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags)
{
        return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
}

asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
{
        return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
}

asmlinkage long compat_sys_paccept(int fd, struct sockaddr __user *upeer_sockaddr,
                                   int __user *upeer_addrlen,
                                   const compat_sigset_t __user *sigmask,
                                   compat_size_t sigsetsize, int flags)
{
        compat_sigset_t ss32;
        sigset_t ksigmask, sigsaved;
        int ret;

        if (sigmask) {
                if (sigsetsize != sizeof(compat_sigset_t))
                        return -EINVAL;
                if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
                        return -EFAULT;
                sigset_from_compat(&ksigmask, &ss32);

                sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
                sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
        }

        ret = do_accept(fd, upeer_sockaddr, upeer_addrlen, flags);

        if (ret == -ERESTARTNOHAND) {
                /*
                 * Don't restore the signal mask yet. Let do_signal() deliver
                 * the signal on the way back to userspace, before the signal
                 * mask is restored.
                 */
                if (sigmask) {
                        memcpy(&current->saved_sigmask, &sigsaved,
                               sizeof(sigsaved));
                        set_restore_sigmask();
                }
        } else if (sigmask)
                sigprocmask(SIG_SETMASK, &sigsaved, NULL);

        return ret;
}

asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
{
        int ret;
        u32 a[6];
        u32 a0, a1;

        if (call < SYS_SOCKET || call > SYS_PACCEPT)
                return -EINVAL;
        if (copy_from_user(a, args, nas[call]))
                return -EFAULT;
        a0 = a[0];
        a1 = a[1];

        switch (call) {
        case SYS_SOCKET:
                ret = sys_socket(a0, a1, a[2]);
                break;
        case SYS_BIND:
                ret = sys_bind(a0, compat_ptr(a1), a[2]);
                break;
        case SYS_CONNECT:
                ret = sys_connect(a0, compat_ptr(a1), a[2]);
                break;
        case SYS_LISTEN:
                ret = sys_listen(a0, a1);
                break;
        case SYS_ACCEPT:
                ret = do_accept(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
                break;
        case SYS_GETSOCKNAME:
                ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
                break;
        case SYS_GETPEERNAME:
                ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
                break;
        case SYS_SOCKETPAIR:
                ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
                break;
        case SYS_SEND:
                ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
                break;
        case SYS_SENDTO:
                ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
                break;
        case SYS_RECV:
                ret = sys_recv(a0, compat_ptr(a1), a[2], a[3]);
                break;
        case SYS_RECVFROM:
                ret = sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), compat_ptr(a[5]));
                break;
        case SYS_SHUTDOWN:
                ret = sys_shutdown(a0,a1);
                break;
        case SYS_SETSOCKOPT:
                ret = compat_sys_setsockopt(a0, a1, a[2],
                                compat_ptr(a[3]), a[4]);
                break;
        case SYS_GETSOCKOPT:
                ret = compat_sys_getsockopt(a0, a1, a[2],
                                compat_ptr(a[3]), compat_ptr(a[4]));
                break;
        case SYS_SENDMSG:
                ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
                break;
        case SYS_RECVMSG:
                ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
                break;
        case SYS_PACCEPT:
                ret = compat_sys_paccept(a0, compat_ptr(a1), compat_ptr(a[2]),
                                         compat_ptr(a[3]), a[4], a[5]);
                break;
        default:
                ret = -EINVAL;
                break;
        }
        return ret;
}