+/*
+ * Get a socket option on an socket.
+ *
+ * FIX: POSIX 1003.1g is very ambiguous here. It states that
+ * asynchronous errors should be reported by getsockopt. We assume
+ * this means if you specify SO_ERROR (otherwise whats the point of it).
+ */
+int sock_common_getsockopt(struct socket *sock, int level, int optname,
+ char __user *optval, int __user *optlen)
+{
+ struct sock *sk = sock->sk;
+
+ return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
+}
+
+EXPORT_SYMBOL(sock_common_getsockopt);
+
+int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
+ struct msghdr *msg, size_t size, int flags)
+{
+ struct sock *sk = sock->sk;
+ int addr_len = 0;
+ int err;
+
+ err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
+ flags & ~MSG_DONTWAIT, &addr_len);
+ if (err >= 0)
+ msg->msg_namelen = addr_len;
+ return err;
+}
+
+EXPORT_SYMBOL(sock_common_recvmsg);
+
+/*
+ * Set socket options on an inet socket.
+ */
+int sock_common_setsockopt(struct socket *sock, int level, int optname,
+ char __user *optval, int optlen)
+{
+ struct sock *sk = sock->sk;
+
+ return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
+}
+
+EXPORT_SYMBOL(sock_common_setsockopt);
+
+void sk_common_release(struct sock *sk)
+{
+ if (sk->sk_prot->destroy)
+ sk->sk_prot->destroy(sk);
+
+ /*
+ * Observation: when sock_common_release is called, processes have
+ * no access to socket. But net still has.
+ * Step one, detach it from networking:
+ *
+ * A. Remove from hash tables.
+ */
+
+ sk->sk_prot->unhash(sk);
+
+ /*
+ * In this point socket cannot receive new packets, but it is possible
+ * that some packets are in flight because some CPU runs receiver and
+ * did hash table lookup before we unhashed socket. They will achieve
+ * receive queue and will be purged by socket destructor.
+ *
+ * Also we still have packets pending on receive queue and probably,
+ * our own packets waiting in device queues. sock_destroy will drain
+ * receive queue, but transmitted packets will delay socket destruction
+ * until the last reference will be released.
+ */
+
+ sock_orphan(sk);
+
+ xfrm_sk_free_policy(sk);
+
+#ifdef INET_REFCNT_DEBUG
+ if (atomic_read(&sk->sk_refcnt) != 1)
+ printk(KERN_DEBUG "Destruction of the socket %p delayed, c=%d\n",
+ sk, atomic_read(&sk->sk_refcnt));
+#endif
+ sock_put(sk);
+}
+
+EXPORT_SYMBOL(sk_common_release);
+