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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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![Eric W. Biederman](/assets/img/avatar_default.png)
This patch passes in the namespace a new socket should be created in and has the socket code do the appropriate reference counting. By virtue of this all socket create methods are touched. In addition the socket create methods are modified so that they will fail if you attempt to create a socket in a non-default network namespace. Failing if we attempt to create a socket outside of the default network namespace ensures that as we incrementally make the network stack network namespace aware we will not export functionality that someone has not audited and made certain is network namespace safe. Allowing us to partially enable network namespaces before all of the exotic protocols are supported. Any protocol layers I have missed will fail to compile because I now pass an extra parameter into the socket creation code. [ Integrated AF_IUCV build fixes from Andrew Morton... -DaveM ] Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
372 lines
7.8 KiB
C
372 lines
7.8 KiB
C
/*
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BlueZ - Bluetooth protocol stack for Linux
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Copyright (C) 2000-2001 Qualcomm Incorporated
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Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License version 2 as
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published by the Free Software Foundation;
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
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IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
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CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
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COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
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SOFTWARE IS DISCLAIMED.
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*/
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/* Bluetooth address family and sockets. */
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/skbuff.h>
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#include <linux/init.h>
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#include <linux/poll.h>
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#include <net/sock.h>
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#if defined(CONFIG_KMOD)
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#include <linux/kmod.h>
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#endif
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#include <net/bluetooth/bluetooth.h>
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#ifndef CONFIG_BT_SOCK_DEBUG
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#undef BT_DBG
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#define BT_DBG(D...)
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#endif
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#define VERSION "2.11"
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/* Bluetooth sockets */
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#define BT_MAX_PROTO 8
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static struct net_proto_family *bt_proto[BT_MAX_PROTO];
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static DEFINE_RWLOCK(bt_proto_lock);
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int bt_sock_register(int proto, struct net_proto_family *ops)
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{
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int err = 0;
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if (proto < 0 || proto >= BT_MAX_PROTO)
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return -EINVAL;
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write_lock(&bt_proto_lock);
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if (bt_proto[proto])
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err = -EEXIST;
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else
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bt_proto[proto] = ops;
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write_unlock(&bt_proto_lock);
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return err;
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}
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EXPORT_SYMBOL(bt_sock_register);
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int bt_sock_unregister(int proto)
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{
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int err = 0;
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if (proto < 0 || proto >= BT_MAX_PROTO)
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return -EINVAL;
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write_lock(&bt_proto_lock);
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if (!bt_proto[proto])
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err = -ENOENT;
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else
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bt_proto[proto] = NULL;
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write_unlock(&bt_proto_lock);
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return err;
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}
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EXPORT_SYMBOL(bt_sock_unregister);
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static int bt_sock_create(struct net *net, struct socket *sock, int proto)
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{
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int err;
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if (net != &init_net)
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return -EAFNOSUPPORT;
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if (proto < 0 || proto >= BT_MAX_PROTO)
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return -EINVAL;
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#if defined(CONFIG_KMOD)
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if (!bt_proto[proto]) {
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request_module("bt-proto-%d", proto);
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}
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#endif
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err = -EPROTONOSUPPORT;
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read_lock(&bt_proto_lock);
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if (bt_proto[proto] && try_module_get(bt_proto[proto]->owner)) {
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err = bt_proto[proto]->create(net, sock, proto);
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module_put(bt_proto[proto]->owner);
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}
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read_unlock(&bt_proto_lock);
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return err;
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}
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void bt_sock_link(struct bt_sock_list *l, struct sock *sk)
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{
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write_lock_bh(&l->lock);
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sk_add_node(sk, &l->head);
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write_unlock_bh(&l->lock);
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}
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EXPORT_SYMBOL(bt_sock_link);
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void bt_sock_unlink(struct bt_sock_list *l, struct sock *sk)
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{
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write_lock_bh(&l->lock);
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sk_del_node_init(sk);
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write_unlock_bh(&l->lock);
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}
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EXPORT_SYMBOL(bt_sock_unlink);
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void bt_accept_enqueue(struct sock *parent, struct sock *sk)
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{
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BT_DBG("parent %p, sk %p", parent, sk);
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sock_hold(sk);
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list_add_tail(&bt_sk(sk)->accept_q, &bt_sk(parent)->accept_q);
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bt_sk(sk)->parent = parent;
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parent->sk_ack_backlog++;
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}
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EXPORT_SYMBOL(bt_accept_enqueue);
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void bt_accept_unlink(struct sock *sk)
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{
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BT_DBG("sk %p state %d", sk, sk->sk_state);
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list_del_init(&bt_sk(sk)->accept_q);
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bt_sk(sk)->parent->sk_ack_backlog--;
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bt_sk(sk)->parent = NULL;
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sock_put(sk);
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}
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EXPORT_SYMBOL(bt_accept_unlink);
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struct sock *bt_accept_dequeue(struct sock *parent, struct socket *newsock)
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{
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struct list_head *p, *n;
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struct sock *sk;
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BT_DBG("parent %p", parent);
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list_for_each_safe(p, n, &bt_sk(parent)->accept_q) {
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sk = (struct sock *) list_entry(p, struct bt_sock, accept_q);
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lock_sock(sk);
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/* FIXME: Is this check still needed */
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if (sk->sk_state == BT_CLOSED) {
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release_sock(sk);
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bt_accept_unlink(sk);
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continue;
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}
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if (sk->sk_state == BT_CONNECTED || !newsock) {
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bt_accept_unlink(sk);
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if (newsock)
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sock_graft(sk, newsock);
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release_sock(sk);
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return sk;
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}
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release_sock(sk);
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}
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return NULL;
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}
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EXPORT_SYMBOL(bt_accept_dequeue);
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int bt_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
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struct msghdr *msg, size_t len, int flags)
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{
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int noblock = flags & MSG_DONTWAIT;
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struct sock *sk = sock->sk;
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struct sk_buff *skb;
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size_t copied;
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int err;
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BT_DBG("sock %p sk %p len %d", sock, sk, len);
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if (flags & (MSG_OOB))
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return -EOPNOTSUPP;
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if (!(skb = skb_recv_datagram(sk, flags, noblock, &err))) {
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if (sk->sk_shutdown & RCV_SHUTDOWN)
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return 0;
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return err;
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}
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msg->msg_namelen = 0;
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copied = skb->len;
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if (len < copied) {
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msg->msg_flags |= MSG_TRUNC;
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copied = len;
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}
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skb_reset_transport_header(skb);
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err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
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skb_free_datagram(sk, skb);
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return err ? : copied;
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}
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EXPORT_SYMBOL(bt_sock_recvmsg);
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static inline unsigned int bt_accept_poll(struct sock *parent)
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{
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struct list_head *p, *n;
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struct sock *sk;
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list_for_each_safe(p, n, &bt_sk(parent)->accept_q) {
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sk = (struct sock *) list_entry(p, struct bt_sock, accept_q);
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if (sk->sk_state == BT_CONNECTED)
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return POLLIN | POLLRDNORM;
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}
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return 0;
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}
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unsigned int bt_sock_poll(struct file * file, struct socket *sock, poll_table *wait)
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{
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struct sock *sk = sock->sk;
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unsigned int mask = 0;
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BT_DBG("sock %p, sk %p", sock, sk);
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poll_wait(file, sk->sk_sleep, wait);
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if (sk->sk_state == BT_LISTEN)
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return bt_accept_poll(sk);
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if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
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mask |= POLLERR;
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if (sk->sk_shutdown & RCV_SHUTDOWN)
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mask |= POLLRDHUP;
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if (sk->sk_shutdown == SHUTDOWN_MASK)
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mask |= POLLHUP;
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if (!skb_queue_empty(&sk->sk_receive_queue) ||
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(sk->sk_shutdown & RCV_SHUTDOWN))
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mask |= POLLIN | POLLRDNORM;
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if (sk->sk_state == BT_CLOSED)
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mask |= POLLHUP;
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if (sk->sk_state == BT_CONNECT ||
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sk->sk_state == BT_CONNECT2 ||
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sk->sk_state == BT_CONFIG)
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return mask;
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if (sock_writeable(sk))
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mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
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else
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set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
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return mask;
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}
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EXPORT_SYMBOL(bt_sock_poll);
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int bt_sock_wait_state(struct sock *sk, int state, unsigned long timeo)
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{
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DECLARE_WAITQUEUE(wait, current);
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int err = 0;
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BT_DBG("sk %p", sk);
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add_wait_queue(sk->sk_sleep, &wait);
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while (sk->sk_state != state) {
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set_current_state(TASK_INTERRUPTIBLE);
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if (!timeo) {
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err = -EINPROGRESS;
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break;
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}
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if (signal_pending(current)) {
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err = sock_intr_errno(timeo);
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break;
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}
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release_sock(sk);
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timeo = schedule_timeout(timeo);
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lock_sock(sk);
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err = sock_error(sk);
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if (err)
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break;
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}
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set_current_state(TASK_RUNNING);
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remove_wait_queue(sk->sk_sleep, &wait);
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return err;
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}
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EXPORT_SYMBOL(bt_sock_wait_state);
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static struct net_proto_family bt_sock_family_ops = {
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.owner = THIS_MODULE,
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.family = PF_BLUETOOTH,
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.create = bt_sock_create,
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};
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static int __init bt_init(void)
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{
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int err;
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BT_INFO("Core ver %s", VERSION);
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err = bt_sysfs_init();
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if (err < 0)
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return err;
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err = sock_register(&bt_sock_family_ops);
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if (err < 0) {
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bt_sysfs_cleanup();
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return err;
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}
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BT_INFO("HCI device and connection manager initialized");
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hci_sock_init();
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return 0;
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}
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static void __exit bt_exit(void)
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{
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hci_sock_cleanup();
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sock_unregister(PF_BLUETOOTH);
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bt_sysfs_cleanup();
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}
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subsys_initcall(bt_init);
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module_exit(bt_exit);
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MODULE_AUTHOR("Maxim Krasnyansky <maxk@qualcomm.com>, Marcel Holtmann <marcel@holtmann.org>");
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MODULE_DESCRIPTION("Bluetooth Core ver " VERSION);
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MODULE_VERSION(VERSION);
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_NETPROTO(PF_BLUETOOTH);
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