net: Document the kernel_recvmsg() function

[pandora-kernel.git] / net / socket.c

diff --git a/net/socket.c b/net/socket.c
index 2270b94..088fb3f 100644 (file)
--- a/net/socket.c
+++ b/net/socket.c
@@ -209,8 +209,8 @@ int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr *kaddr)
  *     specified. Zero is returned for a success.
  */
 
-int move_addr_to_user(struct sockaddr *kaddr, int klen, void __user *uaddr,
-                     int __user *ulen)
+static int move_addr_to_user(struct sockaddr *kaddr, int klen,
+                            void __user *uaddr, int __user *ulen)
 {
        int err;
        int len;
@@ -305,19 +305,17 @@ static const struct super_operations sockfs_ops = {
        .statfs         = simple_statfs,
 };
 
-static int sockfs_get_sb(struct file_system_type *fs_type,
-                        int flags, const char *dev_name, void *data,
-                        struct vfsmount *mnt)
+static struct dentry *sockfs_mount(struct file_system_type *fs_type,
+                        int flags, const char *dev_name, void *data)
 {
-       return get_sb_pseudo(fs_type, "socket:", &sockfs_ops, SOCKFS_MAGIC,
-                            mnt);
+       return mount_pseudo(fs_type, "socket:", &sockfs_ops, SOCKFS_MAGIC);
 }
 
 static struct vfsmount *sock_mnt __read_mostly;
 
 static struct file_system_type sock_fs_type = {
        .name =         "sockfs",
-       .get_sb =       sockfs_get_sb,
+       .mount =        sockfs_mount,
        .kill_sb =      kill_anon_super,
 };
 
@@ -377,7 +375,7 @@ static int sock_alloc_file(struct socket *sock, struct file **f, int flags)
                  &socket_file_ops);
        if (unlikely(!file)) {
                /* drop dentry, keep inode */
-               atomic_inc(&path.dentry->d_inode->i_count);
+               ihold(path.dentry->d_inode);
                path_put(&path);
                put_unused_fd(fd);
                return -ENFILE;
@@ -480,6 +478,7 @@ static struct socket *sock_alloc(void)
        sock = SOCKET_I(inode);
 
        kmemcheck_annotate_bitfield(sock, type);
+       inode->i_ino = get_next_ino();
        inode->i_mode = S_IFSOCK | S_IRWXUGO;
        inode->i_uid = current_fsuid();
        inode->i_gid = current_fsgid();
@@ -502,6 +501,7 @@ static int sock_no_open(struct inode *irrelevant, struct file *dontcare)
 const struct file_operations bad_sock_fops = {
        .owner = THIS_MODULE,
        .open = sock_no_open,
+       .llseek = noop_llseek,
 };
 
 /**
@@ -535,14 +535,13 @@ void sock_release(struct socket *sock)
 }
 EXPORT_SYMBOL(sock_release);
 
-int sock_tx_timestamp(struct msghdr *msg, struct sock *sk,
-                     union skb_shared_tx *shtx)
+int sock_tx_timestamp(struct sock *sk, __u8 *tx_flags)
 {
-       shtx->flags = 0;
+       *tx_flags = 0;
        if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
-               shtx->hardware = 1;
+               *tx_flags |= SKBTX_HW_TSTAMP;
        if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
-               shtx->software = 1;
+               *tx_flags |= SKBTX_SW_TSTAMP;
        return 0;
 }
 EXPORT_SYMBOL(sock_tx_timestamp);
@@ -662,7 +661,8 @@ void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
 }
 EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
 
-inline void sock_recv_drops(struct msghdr *msg, struct sock *sk, struct sk_buff *skb)
+static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
+                                  struct sk_buff *skb)
 {
        if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && skb->dropcount)
                put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
@@ -732,6 +732,21 @@ static int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
        return ret;
 }
 
+/**
+ * kernel_recvmsg - Receive a message from a socket (kernel space)
+ * @sock:       The socket to receive the message from
+ * @msg:        Received message
+ * @vec:        Input s/g array for message data
+ * @num:        Size of input s/g array
+ * @size:       Number of bytes to read
+ * @flags:      Message flags (MSG_DONTWAIT, etc...)
+ *
+ * On return the msg structure contains the scatter/gather array passed in the
+ * vec argument. The array is modified so that it consists of the unfilled
+ * portion of the original array.
+ *
+ * The returned value is the total number of bytes received, or an error.
+ */
 int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
                   struct kvec *vec, size_t num, size_t size, int flags)
 {
@@ -1144,7 +1159,7 @@ call_kill:
 }
 EXPORT_SYMBOL(sock_wake_async);
 
-static int __sock_create(struct net *net, int family, int type, int protocol,
+int __sock_create(struct net *net, int family, int type, int protocol,
                         struct socket **res, int kern)
 {
        int err;
@@ -1256,6 +1271,7 @@ out_release:
        rcu_read_unlock();
        goto out_sock_release;
 }
+EXPORT_SYMBOL(__sock_create);
 
 int sock_create(int family, int type, int protocol, struct socket **res)
 {
@@ -1651,6 +1667,8 @@ SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
        struct iovec iov;
        int fput_needed;
 
+       if (len > INT_MAX)
+               len = INT_MAX;
        sock = sockfd_lookup_light(fd, &err, &fput_needed);
        if (!sock)
                goto out;
@@ -1708,6 +1726,8 @@ SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
        int err, err2;
        int fput_needed;
 
+       if (size > INT_MAX)
+               size = INT_MAX;
        sock = sockfd_lookup_light(fd, &err, &fput_needed);
        if (!sock)
                goto out;
@@ -1919,7 +1939,8 @@ SYSCALL_DEFINE3(sendmsg, int, fd, struct msghdr __user *, msg, unsigned, flags)
                 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
                 * checking falls down on this.
                 */
-               if (copy_from_user(ctl_buf, (void __user *)msg_sys.msg_control,
+               if (copy_from_user(ctl_buf,
+                                  (void __user __force *)msg_sys.msg_control,
                                   ctl_len))
                        goto out_freectl;
                msg_sys.msg_control = ctl_buf;
@@ -3054,14 +3075,19 @@ int kernel_getsockopt(struct socket *sock, int level, int optname,
                        char *optval, int *optlen)
 {
        mm_segment_t oldfs = get_fs();
+       char __user *uoptval;
+       int __user *uoptlen;
        int err;
 
+       uoptval = (char __user __force *) optval;
+       uoptlen = (int __user __force *) optlen;
+
        set_fs(KERNEL_DS);
        if (level == SOL_SOCKET)
-               err = sock_getsockopt(sock, level, optname, optval, optlen);
+               err = sock_getsockopt(sock, level, optname, uoptval, uoptlen);
        else
-               err = sock->ops->getsockopt(sock, level, optname, optval,
-                                           optlen);
+               err = sock->ops->getsockopt(sock, level, optname, uoptval,
+                                           uoptlen);
        set_fs(oldfs);
        return err;
 }
@@ -3071,13 +3097,16 @@ int kernel_setsockopt(struct socket *sock, int level, int optname,
                        char *optval, unsigned int optlen)
 {
        mm_segment_t oldfs = get_fs();
+       char __user *uoptval;
        int err;
 
+       uoptval = (char __user __force *) optval;
+
        set_fs(KERNEL_DS);
        if (level == SOL_SOCKET)
-               err = sock_setsockopt(sock, level, optname, optval, optlen);
+               err = sock_setsockopt(sock, level, optname, uoptval, optlen);
        else
-               err = sock->ops->setsockopt(sock, level, optname, optval,
+               err = sock->ops->setsockopt(sock, level, optname, uoptval,
                                            optlen);
        set_fs(oldfs);
        return err;