2008-09-22 23:05:19 -04:00
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/*
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* File: socket.c
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*
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* Phonet sockets
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*
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* Copyright (C) 2008 Nokia Corporation.
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*
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* Contact: Remi Denis-Courmont <remi.denis-courmont@nokia.com>
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* Original author: Sakari Ailus <sakari.ailus@nokia.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#include <linux/kernel.h>
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#include <linux/net.h>
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2008-10-05 14:14:48 -04:00
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#include <linux/poll.h>
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2008-09-22 23:05:19 -04:00
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#include <net/sock.h>
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#include <net/tcp_states.h>
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#include <linux/phonet.h>
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#include <net/phonet/phonet.h>
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2008-10-05 14:14:48 -04:00
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#include <net/phonet/pep.h>
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2008-09-22 23:05:19 -04:00
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#include <net/phonet/pn_dev.h>
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static int pn_socket_release(struct socket *sock)
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{
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struct sock *sk = sock->sk;
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if (sk) {
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sock->sk = NULL;
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sk->sk_prot->close(sk, 0);
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}
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return 0;
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}
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static struct {
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struct hlist_head hlist;
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spinlock_t lock;
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} pnsocks = {
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.hlist = HLIST_HEAD_INIT,
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.lock = __SPIN_LOCK_UNLOCKED(pnsocks.lock),
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};
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/*
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* Find address based on socket address, match only certain fields.
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* Also grab sock if it was found. Remember to sock_put it later.
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*/
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2008-12-03 18:42:56 -05:00
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struct sock *pn_find_sock_by_sa(struct net *net, const struct sockaddr_pn *spn)
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2008-09-22 23:05:19 -04:00
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{
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struct hlist_node *node;
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struct sock *sknode;
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struct sock *rval = NULL;
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u16 obj = pn_sockaddr_get_object(spn);
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u8 res = spn->spn_resource;
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spin_lock_bh(&pnsocks.lock);
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sk_for_each(sknode, node, &pnsocks.hlist) {
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struct pn_sock *pn = pn_sk(sknode);
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BUG_ON(!pn->sobject); /* unbound socket */
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2008-12-03 18:42:56 -05:00
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if (!net_eq(sock_net(sknode), net))
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continue;
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2008-09-22 23:05:19 -04:00
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if (pn_port(obj)) {
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/* Look up socket by port */
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if (pn_port(pn->sobject) != pn_port(obj))
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continue;
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} else {
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/* If port is zero, look up by resource */
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if (pn->resource != res)
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continue;
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}
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if (pn_addr(pn->sobject)
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&& pn_addr(pn->sobject) != pn_addr(obj))
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continue;
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rval = sknode;
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sock_hold(sknode);
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break;
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}
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spin_unlock_bh(&pnsocks.lock);
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return rval;
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}
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void pn_sock_hash(struct sock *sk)
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{
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spin_lock_bh(&pnsocks.lock);
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sk_add_node(sk, &pnsocks.hlist);
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spin_unlock_bh(&pnsocks.lock);
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}
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EXPORT_SYMBOL(pn_sock_hash);
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void pn_sock_unhash(struct sock *sk)
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{
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spin_lock_bh(&pnsocks.lock);
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sk_del_node_init(sk);
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spin_unlock_bh(&pnsocks.lock);
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}
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EXPORT_SYMBOL(pn_sock_unhash);
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static int pn_socket_bind(struct socket *sock, struct sockaddr *addr, int len)
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{
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struct sock *sk = sock->sk;
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struct pn_sock *pn = pn_sk(sk);
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struct sockaddr_pn *spn = (struct sockaddr_pn *)addr;
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int err;
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u16 handle;
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u8 saddr;
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if (sk->sk_prot->bind)
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return sk->sk_prot->bind(sk, addr, len);
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if (len < sizeof(struct sockaddr_pn))
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return -EINVAL;
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if (spn->spn_family != AF_PHONET)
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return -EAFNOSUPPORT;
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handle = pn_sockaddr_get_object((struct sockaddr_pn *)addr);
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saddr = pn_addr(handle);
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2008-12-03 18:42:56 -05:00
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if (saddr && phonet_address_lookup(sock_net(sk), saddr))
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2008-09-22 23:05:19 -04:00
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return -EADDRNOTAVAIL;
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lock_sock(sk);
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if (sk->sk_state != TCP_CLOSE || pn_port(pn->sobject)) {
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err = -EINVAL; /* attempt to rebind */
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goto out;
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}
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err = sk->sk_prot->get_port(sk, pn_port(handle));
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if (err)
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goto out;
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/* get_port() sets the port, bind() sets the address if applicable */
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pn->sobject = pn_object(saddr, pn_port(pn->sobject));
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pn->resource = spn->spn_resource;
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/* Enable RX on the socket */
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sk->sk_prot->hash(sk);
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out:
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release_sock(sk);
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return err;
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}
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static int pn_socket_autobind(struct socket *sock)
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{
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struct sockaddr_pn sa;
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int err;
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memset(&sa, 0, sizeof(sa));
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sa.spn_family = AF_PHONET;
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err = pn_socket_bind(sock, (struct sockaddr *)&sa,
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sizeof(struct sockaddr_pn));
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if (err != -EINVAL)
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return err;
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BUG_ON(!pn_port(pn_sk(sock->sk)->sobject));
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return 0; /* socket was already bound */
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}
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2008-10-05 14:14:48 -04:00
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static int pn_socket_accept(struct socket *sock, struct socket *newsock,
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int flags)
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{
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struct sock *sk = sock->sk;
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struct sock *newsk;
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int err;
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newsk = sk->sk_prot->accept(sk, flags, &err);
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if (!newsk)
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return err;
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lock_sock(newsk);
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sock_graft(newsk, newsock);
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newsock->state = SS_CONNECTED;
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release_sock(newsk);
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return 0;
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}
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2008-09-22 23:05:19 -04:00
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static int pn_socket_getname(struct socket *sock, struct sockaddr *addr,
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int *sockaddr_len, int peer)
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{
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struct sock *sk = sock->sk;
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struct pn_sock *pn = pn_sk(sk);
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memset(addr, 0, sizeof(struct sockaddr_pn));
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addr->sa_family = AF_PHONET;
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if (!peer) /* Race with bind() here is userland's problem. */
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pn_sockaddr_set_object((struct sockaddr_pn *)addr,
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pn->sobject);
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*sockaddr_len = sizeof(struct sockaddr_pn);
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return 0;
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}
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2008-10-05 14:14:48 -04:00
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static unsigned int pn_socket_poll(struct file *file, struct socket *sock,
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poll_table *wait)
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{
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struct sock *sk = sock->sk;
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struct pep_sock *pn = pep_sk(sk);
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unsigned int mask = 0;
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poll_wait(file, &sock->wait, wait);
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switch (sk->sk_state) {
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case TCP_LISTEN:
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return hlist_empty(&pn->ackq) ? 0 : POLLIN;
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case TCP_CLOSE:
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return POLLERR;
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}
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if (!skb_queue_empty(&sk->sk_receive_queue))
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mask |= POLLIN | POLLRDNORM;
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2008-10-05 14:15:43 -04:00
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if (!skb_queue_empty(&pn->ctrlreq_queue))
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mask |= POLLPRI;
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if (!mask && sk->sk_state == TCP_CLOSE_WAIT)
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2008-10-05 14:14:48 -04:00
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return POLLHUP;
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2008-12-17 18:48:31 -05:00
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if (sk->sk_state == TCP_ESTABLISHED && atomic_read(&pn->tx_credits))
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2008-10-05 14:14:48 -04:00
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mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
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return mask;
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}
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2008-09-22 23:05:19 -04:00
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static int pn_socket_ioctl(struct socket *sock, unsigned int cmd,
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unsigned long arg)
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{
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struct sock *sk = sock->sk;
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struct pn_sock *pn = pn_sk(sk);
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if (cmd == SIOCPNGETOBJECT) {
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struct net_device *dev;
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u16 handle;
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u8 saddr;
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if (get_user(handle, (__u16 __user *)arg))
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return -EFAULT;
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lock_sock(sk);
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if (sk->sk_bound_dev_if)
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dev = dev_get_by_index(sock_net(sk),
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sk->sk_bound_dev_if);
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else
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dev = phonet_device_get(sock_net(sk));
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if (dev && (dev->flags & IFF_UP))
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saddr = phonet_address_get(dev, pn_addr(handle));
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else
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saddr = PN_NO_ADDR;
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release_sock(sk);
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if (dev)
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dev_put(dev);
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if (saddr == PN_NO_ADDR)
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return -EHOSTUNREACH;
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handle = pn_object(saddr, pn_port(pn->sobject));
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return put_user(handle, (__u16 __user *)arg);
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}
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return sk->sk_prot->ioctl(sk, cmd, arg);
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}
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2008-10-05 14:14:48 -04:00
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static int pn_socket_listen(struct socket *sock, int backlog)
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{
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struct sock *sk = sock->sk;
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int err = 0;
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if (sock->state != SS_UNCONNECTED)
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return -EINVAL;
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if (pn_socket_autobind(sock))
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return -ENOBUFS;
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lock_sock(sk);
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if (sk->sk_state != TCP_CLOSE) {
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err = -EINVAL;
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goto out;
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}
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sk->sk_state = TCP_LISTEN;
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sk->sk_ack_backlog = 0;
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sk->sk_max_ack_backlog = backlog;
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out:
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release_sock(sk);
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return err;
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}
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2008-09-22 23:05:19 -04:00
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static int pn_socket_sendmsg(struct kiocb *iocb, struct socket *sock,
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struct msghdr *m, size_t total_len)
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{
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struct sock *sk = sock->sk;
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if (pn_socket_autobind(sock))
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return -EAGAIN;
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return sk->sk_prot->sendmsg(iocb, sk, m, total_len);
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}
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const struct proto_ops phonet_dgram_ops = {
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.family = AF_PHONET,
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.owner = THIS_MODULE,
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.release = pn_socket_release,
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.bind = pn_socket_bind,
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.connect = sock_no_connect,
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.socketpair = sock_no_socketpair,
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.accept = sock_no_accept,
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.getname = pn_socket_getname,
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.poll = datagram_poll,
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.ioctl = pn_socket_ioctl,
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.listen = sock_no_listen,
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.shutdown = sock_no_shutdown,
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.setsockopt = sock_no_setsockopt,
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.getsockopt = sock_no_getsockopt,
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#ifdef CONFIG_COMPAT
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.compat_setsockopt = sock_no_setsockopt,
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.compat_getsockopt = sock_no_getsockopt,
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#endif
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.sendmsg = pn_socket_sendmsg,
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.recvmsg = sock_common_recvmsg,
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.mmap = sock_no_mmap,
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.sendpage = sock_no_sendpage,
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};
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2008-10-05 14:14:48 -04:00
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const struct proto_ops phonet_stream_ops = {
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.family = AF_PHONET,
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.owner = THIS_MODULE,
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.release = pn_socket_release,
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.bind = pn_socket_bind,
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.connect = sock_no_connect,
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.socketpair = sock_no_socketpair,
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.accept = pn_socket_accept,
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.getname = pn_socket_getname,
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.poll = pn_socket_poll,
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.ioctl = pn_socket_ioctl,
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.listen = pn_socket_listen,
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.shutdown = sock_no_shutdown,
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2008-10-05 14:16:16 -04:00
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.setsockopt = sock_common_setsockopt,
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.getsockopt = sock_common_getsockopt,
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2008-10-05 14:14:48 -04:00
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#ifdef CONFIG_COMPAT
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2008-10-05 14:16:16 -04:00
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.compat_setsockopt = compat_sock_common_setsockopt,
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.compat_getsockopt = compat_sock_common_getsockopt,
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2008-10-05 14:14:48 -04:00
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#endif
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.sendmsg = pn_socket_sendmsg,
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.recvmsg = sock_common_recvmsg,
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.mmap = sock_no_mmap,
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.sendpage = sock_no_sendpage,
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};
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EXPORT_SYMBOL(phonet_stream_ops);
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2008-09-22 23:05:19 -04:00
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static DEFINE_MUTEX(port_mutex);
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/* allocate port for a socket */
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int pn_sock_get_port(struct sock *sk, unsigned short sport)
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{
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static int port_cur;
|
2008-12-03 18:42:56 -05:00
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struct net *net = sock_net(sk);
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2008-09-22 23:05:19 -04:00
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struct pn_sock *pn = pn_sk(sk);
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struct sockaddr_pn try_sa;
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struct sock *tmpsk;
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memset(&try_sa, 0, sizeof(struct sockaddr_pn));
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try_sa.spn_family = AF_PHONET;
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mutex_lock(&port_mutex);
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if (!sport) {
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/* search free port */
|
2008-09-22 23:08:39 -04:00
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int port, pmin, pmax;
|
2008-09-22 23:05:19 -04:00
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|
2008-09-22 23:08:39 -04:00
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phonet_get_local_port_range(&pmin, &pmax);
|
2008-09-22 23:05:19 -04:00
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|
|
for (port = pmin; port <= pmax; port++) {
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port_cur++;
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|
if (port_cur < pmin || port_cur > pmax)
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|
port_cur = pmin;
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|
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pn_sockaddr_set_port(&try_sa, port_cur);
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2008-12-03 18:42:56 -05:00
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|
tmpsk = pn_find_sock_by_sa(net, &try_sa);
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2008-09-22 23:05:19 -04:00
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|
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if (tmpsk == NULL) {
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sport = port_cur;
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goto found;
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} else
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|
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sock_put(tmpsk);
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|
|
}
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} else {
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|
|
|
/* try to find specific port */
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|
|
|
pn_sockaddr_set_port(&try_sa, sport);
|
2008-12-03 18:42:56 -05:00
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|
|
tmpsk = pn_find_sock_by_sa(net, &try_sa);
|
2008-09-22 23:05:19 -04:00
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|
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if (tmpsk == NULL)
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|
|
/* No sock there! We can use that port... */
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goto found;
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else
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|
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sock_put(tmpsk);
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}
|
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|
|
mutex_unlock(&port_mutex);
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|
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|
|
|
|
/* the port must be in use already */
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|
|
|
return -EADDRINUSE;
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|
|
found:
|
|
|
|
mutex_unlock(&port_mutex);
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|
|
pn->sobject = pn_object(pn_addr(pn->sobject), sport);
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|
|
|
return 0;
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|
|
|
}
|
|
|
|
EXPORT_SYMBOL(pn_sock_get_port);
|