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DEFINITIONS
This source file includes following definitions.
- pn_socket_release
- pn_find_sock_by_sa
- pn_sock_hash
- pn_sock_unhash
- pn_socket_bind
- pn_socket_autobind
- pn_socket_accept
- pn_socket_getname
- pn_socket_poll
- pn_socket_ioctl
- pn_socket_listen
- pn_socket_sendmsg
- pn_sock_get_port
/*
* File: socket.c
*
* Phonet sockets
*
* Copyright (C) 2008 Nokia Corporation.
*
* Contact: Remi Denis-Courmont <remi.denis-courmont@nokia.com>
* Original author: Sakari Ailus <sakari.ailus@nokia.com>
*
* 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
*/
#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)
{
struct sock *sk = sock->sk;
if (sk) {
sock->sk = NULL;
sk->sk_prot->close(sk, 0);
}
return 0;
}
static struct {
struct hlist_head hlist;
spinlock_t lock;
} pnsocks = {
.hlist = HLIST_HEAD_INIT,
.lock = __SPIN_LOCK_UNLOCKED(pnsocks.lock),
};
/*
* Find address based on socket address, match only certain fields.
* Also grab sock if it was found. Remember to sock_put it later.
*/
struct sock *pn_find_sock_by_sa(const struct sockaddr_pn *spn)
{
struct hlist_node *node;
struct sock *sknode;
struct sock *rval = NULL;
u16 obj = pn_sockaddr_get_object(spn);
u8 res = spn->spn_resource;
spin_lock_bh(&pnsocks.lock);
sk_for_each(sknode, node, &pnsocks.hlist) {
struct pn_sock *pn = pn_sk(sknode);
BUG_ON(!pn->sobject); /* unbound socket */
if (pn_port(obj)) {
/* Look up socket by port */
if (pn_port(pn->sobject) != pn_port(obj))
continue;
} else {
/* If port is zero, look up by resource */
if (pn->resource != res)
continue;
}
if (pn_addr(pn->sobject)
&& pn_addr(pn->sobject) != pn_addr(obj))
continue;
rval = sknode;
sock_hold(sknode);
break;
}
spin_unlock_bh(&pnsocks.lock);
return rval;
}
void pn_sock_hash(struct sock *sk)
{
spin_lock_bh(&pnsocks.lock);
sk_add_node(sk, &pnsocks.hlist);
spin_unlock_bh(&pnsocks.lock);
}
EXPORT_SYMBOL(pn_sock_hash);
void pn_sock_unhash(struct sock *sk)
{
spin_lock_bh(&pnsocks.lock);
sk_del_node_init(sk);
spin_unlock_bh(&pnsocks.lock);
}
EXPORT_SYMBOL(pn_sock_unhash);
static int pn_socket_bind(struct socket *sock, struct sockaddr *addr, int len)
{
struct sock *sk = sock->sk;
struct pn_sock *pn = pn_sk(sk);
struct sockaddr_pn *spn = (struct sockaddr_pn *)addr;
int err;
u16 handle;
u8 saddr;
if (sk->sk_prot->bind)
return sk->sk_prot->bind(sk, addr, len);
if (len < sizeof(struct sockaddr_pn))
return -EINVAL;
if (spn->spn_family != AF_PHONET)
return -EAFNOSUPPORT;
handle = pn_sockaddr_get_object((struct sockaddr_pn *)addr);
saddr = pn_addr(handle);
if (saddr && phonet_address_lookup(saddr))
return -EADDRNOTAVAIL;
lock_sock(sk);
if (sk->sk_state != TCP_CLOSE || pn_port(pn->sobject)) {
err = -EINVAL; /* attempt to rebind */
goto out;
}
err = sk->sk_prot->get_port(sk, pn_port(handle));
if (err)
goto out;
/* get_port() sets the port, bind() sets the address if applicable */
pn->sobject = pn_object(saddr, pn_port(pn->sobject));
pn->resource = spn->spn_resource;
/* Enable RX on the socket */
sk->sk_prot->hash(sk);
out:
release_sock(sk);
return err;
}
static int pn_socket_autobind(struct socket *sock)
{
struct sockaddr_pn sa;
int err;
memset(&sa, 0, sizeof(sa));
sa.spn_family = AF_PHONET;
err = pn_socket_bind(sock, (struct sockaddr *)&sa,
sizeof(struct sockaddr_pn));
if (err != -EINVAL)
return err;
BUG_ON(!pn_port(pn_sk(sock->sk)->sobject));
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)
{
struct sock *sk = sock->sk;
struct pn_sock *pn = pn_sk(sk);
memset(addr, 0, sizeof(struct sockaddr_pn));
addr->sa_family = AF_PHONET;
if (!peer) /* Race with bind() here is userland's problem. */
pn_sockaddr_set_object((struct sockaddr_pn *)addr,
pn->sobject);
*sockaddr_len = sizeof(struct sockaddr_pn);
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;
if (!skb_queue_empty(&pn->ctrlreq_queue))
mask |= POLLPRI;
if (!mask && 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)
{
struct sock *sk = sock->sk;
struct pn_sock *pn = pn_sk(sk);
if (cmd == SIOCPNGETOBJECT) {
struct net_device *dev;
u16 handle;
u8 saddr;
if (get_user(handle, (__u16 __user *)arg))
return -EFAULT;
lock_sock(sk);
if (sk->sk_bound_dev_if)
dev = dev_get_by_index(sock_net(sk),
sk->sk_bound_dev_if);
else
dev = phonet_device_get(sock_net(sk));
if (dev && (dev->flags & IFF_UP))
saddr = phonet_address_get(dev, pn_addr(handle));
else
saddr = PN_NO_ADDR;
release_sock(sk);
if (dev)
dev_put(dev);
if (saddr == PN_NO_ADDR)
return -EHOSTUNREACH;
handle = pn_object(saddr, pn_port(pn->sobject));
return put_user(handle, (__u16 __user *)arg);
}
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)
{
struct sock *sk = sock->sk;
if (pn_socket_autobind(sock))
return -EAGAIN;
return sk->sk_prot->sendmsg(iocb, sk, m, total_len);
}
const struct proto_ops phonet_dgram_ops = {
.family = AF_PHONET,
.owner = THIS_MODULE,
.release = pn_socket_release,
.bind = pn_socket_bind,
.connect = sock_no_connect,
.socketpair = sock_no_socketpair,
.accept = sock_no_accept,
.getname = pn_socket_getname,
.poll = datagram_poll,
.ioctl = pn_socket_ioctl,
.listen = sock_no_listen,
.shutdown = sock_no_shutdown,
.setsockopt = sock_no_setsockopt,
.getsockopt = sock_no_getsockopt,
#ifdef CONFIG_COMPAT
.compat_setsockopt = sock_no_setsockopt,
.compat_getsockopt = sock_no_getsockopt,
#endif
.sendmsg = pn_socket_sendmsg,
.recvmsg = sock_common_recvmsg,
.mmap = sock_no_mmap,
.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_common_setsockopt,
.getsockopt = sock_common_getsockopt,
#ifdef CONFIG_COMPAT
.compat_setsockopt = compat_sock_common_setsockopt,
.compat_getsockopt = compat_sock_common_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 */
int pn_sock_get_port(struct sock *sk, unsigned short sport)
{
static int port_cur;
struct pn_sock *pn = pn_sk(sk);
struct sockaddr_pn try_sa;
struct sock *tmpsk;
memset(&try_sa, 0, sizeof(struct sockaddr_pn));
try_sa.spn_family = AF_PHONET;
mutex_lock(&port_mutex);
if (!sport) {
/* search free port */
int port, pmin, pmax;
phonet_get_local_port_range(&pmin, &pmax);
for (port = pmin; port <= pmax; port++) {
port_cur++;
if (port_cur < pmin || port_cur > pmax)
port_cur = pmin;
pn_sockaddr_set_port(&try_sa, port_cur);
tmpsk = pn_find_sock_by_sa(&try_sa);
if (tmpsk == NULL) {
sport = port_cur;
goto found;
} else
sock_put(tmpsk);
}
} else {
/* try to find specific port */
pn_sockaddr_set_port(&try_sa, sport);
tmpsk = pn_find_sock_by_sa(&try_sa);
if (tmpsk == NULL)
/* No sock there! We can use that port... */
goto found;
else
sock_put(tmpsk);
}
mutex_unlock(&port_mutex);
/* the port must be in use already */
return -EADDRINUSE;
found:
mutex_unlock(&port_mutex);
pn->sobject = pn_object(pn_addr(pn->sobject), sport);
return 0;
}
EXPORT_SYMBOL(pn_sock_get_port);