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/*
* 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/gfp.h>
#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;
}
#define PN_HASHSIZE 16
#define PN_HASHMASK (PN_HASHSIZE-1)
static struct {
struct hlist_head hlist[PN_HASHSIZE];
spinlock_t lock;
} pnsocks;
void __init pn_sock_init(void)
{
unsigned i;
for (i = 0; i < PN_HASHSIZE; i++)
INIT_HLIST_HEAD(pnsocks.hlist + i);
spin_lock_init(&pnsocks.lock);
}
static struct hlist_head *pn_hash_list(u16 obj)
{
return pnsocks.hlist + (obj & PN_HASHMASK);
}
/*
* 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(struct net *net, 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;
struct hlist_head *hlist = pn_hash_list(obj);
spin_lock_bh(&pnsocks.lock);
sk_for_each(sknode, node, hlist) {
struct pn_sock *pn = pn_sk(sknode);
BUG_ON(!pn->sobject); /* unbound socket */
if (!net_eq(sock_net(sknode), net))
continue;
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;
}
/* Deliver a broadcast packet (only in bottom-half) */
void pn_deliver_sock_broadcast(struct net *net, struct sk_buff *skb)
{
struct hlist_head *hlist = pnsocks.hlist;
unsigned h;
spin_lock(&pnsocks.lock);
for (h = 0; h < PN_HASHSIZE; h++) {
struct hlist_node *node;
struct sock *sknode;
sk_for_each(sknode, node, hlist) {
struct sk_buff *clone;
if (!net_eq(sock_net(sknode), net))
continue;
if (!sock_flag(sknode, SOCK_BROADCAST))
continue;
clone = skb_clone(skb, GFP_ATOMIC);
if (clone) {
sock_hold(sknode);
sk_receive_skb(sknode, clone, 0);
}
}
hlist++;
}
spin_unlock(&pnsocks.lock);
}
void pn_sock_hash(struct sock *sk)
{
struct hlist_head *hlist = pn_hash_list(pn_sk(sk)->sobject);
spin_lock_bh(&pnsocks.lock);
sk_add_node(sk, 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 DEFINE_MUTEX(port_mutex);
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(sock_net(sk), saddr))
return -EADDRNOTAVAIL;
lock_sock(sk);
if (sk->sk_state != TCP_CLOSE || pn_port(pn->sobject)) {
err = -EINVAL; /* attempt to rebind */
goto out;
}
WARN_ON(sk_hashed(sk));
mutex_lock(&port_mutex);
err = sk->sk_prot->get_port(sk, pn_port(handle));
if (err)
goto out_port;
/* 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_port:
mutex_unlock(&port_mutex);
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
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