Phonet: connected sockets glue
Rémi Denis-Courmont [Sun, 5 Oct 2008 18:14:48 +0000 (11:14 -0700)]
Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/phonet/pep.h [new file with mode: 0644]
net/phonet/socket.c

diff --git a/include/net/phonet/pep.h b/include/net/phonet/pep.h
new file mode 100644 (file)
index 0000000..b2f8c54
--- /dev/null
@@ -0,0 +1,43 @@
+/*
+ * File: pep.h
+ *
+ * Phonet Pipe End Point sockets definitions
+ *
+ * Copyright (C) 2008 Nokia Corporation.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#ifndef NET_PHONET_PEP_H
+#define NET_PHONET_PEP_H
+
+struct pep_sock {
+       struct pn_sock          pn_sk;
+
+       /* Listening socket stuff: */
+       struct hlist_head       ackq;
+
+       /* Connected socket stuff: */
+       u8                      tx_credits;
+};
+
+static inline struct pep_sock *pep_sk(struct sock *sk)
+{
+       return (struct pep_sock *)sk;
+}
+
+extern const struct proto_ops phonet_stream_ops;
+
+#endif
index dfd4061..cea1136 100644 (file)
 
 #include <linux/kernel.h>
 #include <linux/net.h>
+#include <linux/poll.h>
 #include <net/sock.h>
 #include <net/tcp_states.h>
 
 #include <linux/phonet.h>
 #include <net/phonet/phonet.h>
+#include <net/phonet/pep.h>
 #include <net/phonet/pn_dev.h>
 
 static int pn_socket_release(struct socket *sock)
@@ -166,6 +168,24 @@ static int pn_socket_autobind(struct socket *sock)
        return 0; /* socket was already bound */
 }
 
+static int pn_socket_accept(struct socket *sock, struct socket *newsock,
+                               int flags)
+{
+       struct sock *sk = sock->sk;
+       struct sock *newsk;
+       int err;
+
+       newsk = sk->sk_prot->accept(sk, flags, &err);
+       if (!newsk)
+               return err;
+
+       lock_sock(newsk);
+       sock_graft(newsk, newsock);
+       newsock->state = SS_CONNECTED;
+       release_sock(newsk);
+       return 0;
+}
+
 static int pn_socket_getname(struct socket *sock, struct sockaddr *addr,
                                int *sockaddr_len, int peer)
 {
@@ -182,6 +202,33 @@ static int pn_socket_getname(struct socket *sock, struct sockaddr *addr,
        return 0;
 }
 
+static unsigned int pn_socket_poll(struct file *file, struct socket *sock,
+                                       poll_table *wait)
+{
+       struct sock *sk = sock->sk;
+       struct pep_sock *pn = pep_sk(sk);
+       unsigned int mask = 0;
+
+       poll_wait(file, &sock->wait, wait);
+
+       switch (sk->sk_state) {
+       case TCP_LISTEN:
+               return hlist_empty(&pn->ackq) ? 0 : POLLIN;
+       case TCP_CLOSE:
+               return POLLERR;
+       }
+
+       if (!skb_queue_empty(&sk->sk_receive_queue))
+               mask |= POLLIN | POLLRDNORM;
+       else if (sk->sk_state == TCP_CLOSE_WAIT)
+               return POLLHUP;
+
+       if (sk->sk_state == TCP_ESTABLISHED && pn->tx_credits)
+               mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
+
+       return mask;
+}
+
 static int pn_socket_ioctl(struct socket *sock, unsigned int cmd,
                                unsigned long arg)
 {
@@ -220,6 +267,30 @@ static int pn_socket_ioctl(struct socket *sock, unsigned int cmd,
        return sk->sk_prot->ioctl(sk, cmd, arg);
 }
 
+static int pn_socket_listen(struct socket *sock, int backlog)
+{
+       struct sock *sk = sock->sk;
+       int err = 0;
+
+       if (sock->state != SS_UNCONNECTED)
+               return -EINVAL;
+       if (pn_socket_autobind(sock))
+               return -ENOBUFS;
+
+       lock_sock(sk);
+       if (sk->sk_state != TCP_CLOSE) {
+               err = -EINVAL;
+               goto out;
+       }
+
+       sk->sk_state = TCP_LISTEN;
+       sk->sk_ack_backlog = 0;
+       sk->sk_max_ack_backlog = backlog;
+out:
+       release_sock(sk);
+       return err;
+}
+
 static int pn_socket_sendmsg(struct kiocb *iocb, struct socket *sock,
                                struct msghdr *m, size_t total_len)
 {
@@ -256,6 +327,32 @@ const struct proto_ops phonet_dgram_ops = {
        .sendpage       = sock_no_sendpage,
 };
 
+const struct proto_ops phonet_stream_ops = {
+       .family         = AF_PHONET,
+       .owner          = THIS_MODULE,
+       .release        = pn_socket_release,
+       .bind           = pn_socket_bind,
+       .connect        = sock_no_connect,
+       .socketpair     = sock_no_socketpair,
+       .accept         = pn_socket_accept,
+       .getname        = pn_socket_getname,
+       .poll           = pn_socket_poll,
+       .ioctl          = pn_socket_ioctl,
+       .listen         = pn_socket_listen,
+       .shutdown       = sock_no_shutdown,
+       .setsockopt     = sock_no_setsockopt,
+       .getsockopt     = sock_no_getsockopt,
+#ifdef CONFIG_COMPAT
+       .compat_setsockopt = sock_no_setsockopt,
+       .compat_getsockopt = compat_sock_no_getsockopt,
+#endif
+       .sendmsg        = pn_socket_sendmsg,
+       .recvmsg        = sock_common_recvmsg,
+       .mmap           = sock_no_mmap,
+       .sendpage       = sock_no_sendpage,
+};
+EXPORT_SYMBOL(phonet_stream_ops);
+
 static DEFINE_MUTEX(port_mutex);
 
 /* allocate port for a socket */