forked from Minki/linux
31e6d363ab
commit 2b85a34e91
(net: No more expensive sock_hold()/sock_put() on each tx)
changed initial sk_wmem_alloc value.
We need to take into account this offset when reporting
sk_wmem_alloc to user, in PROC_FS files or various
ioctls (SIOCOUTQ/TIOCOUTQ)
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
455 lines
9.9 KiB
C
455 lines
9.9 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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#include <asm/ioctls.h>
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#include <linux/kmod.h>
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#include <net/bluetooth/bluetooth.h>
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#define VERSION "2.15"
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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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static struct lock_class_key bt_lock_key[BT_MAX_PROTO];
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static const char *bt_key_strings[BT_MAX_PROTO] = {
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"sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP",
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"sk_lock-AF_BLUETOOTH-BTPROTO_HCI",
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"sk_lock-AF_BLUETOOTH-BTPROTO_SCO",
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"sk_lock-AF_BLUETOOTH-BTPROTO_RFCOMM",
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"sk_lock-AF_BLUETOOTH-BTPROTO_BNEP",
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"sk_lock-AF_BLUETOOTH-BTPROTO_CMTP",
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"sk_lock-AF_BLUETOOTH-BTPROTO_HIDP",
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"sk_lock-AF_BLUETOOTH-BTPROTO_AVDTP",
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};
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static struct lock_class_key bt_slock_key[BT_MAX_PROTO];
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static const char *bt_slock_key_strings[BT_MAX_PROTO] = {
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"slock-AF_BLUETOOTH-BTPROTO_L2CAP",
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"slock-AF_BLUETOOTH-BTPROTO_HCI",
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"slock-AF_BLUETOOTH-BTPROTO_SCO",
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"slock-AF_BLUETOOTH-BTPROTO_RFCOMM",
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"slock-AF_BLUETOOTH-BTPROTO_BNEP",
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"slock-AF_BLUETOOTH-BTPROTO_CMTP",
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"slock-AF_BLUETOOTH-BTPROTO_HIDP",
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"slock-AF_BLUETOOTH-BTPROTO_AVDTP",
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};
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static inline void bt_sock_reclassify_lock(struct socket *sock, int proto)
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{
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struct sock *sk = sock->sk;
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if (!sk)
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return;
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BUG_ON(sock_owned_by_user(sk));
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sock_lock_init_class_and_name(sk,
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bt_slock_key_strings[proto], &bt_slock_key[proto],
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bt_key_strings[proto], &bt_lock_key[proto]);
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}
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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 (!bt_proto[proto])
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request_module("bt-proto-%d", proto);
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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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bt_sock_reclassify_lock(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_sk(parent)->defer_setup) {
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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 %zu", 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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if (err == 0)
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sock_recv_timestamp(msg, sk, skb);
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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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(bt_sk(parent)->defer_setup &&
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sk->sk_state == BT_CONNECT2))
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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_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
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{
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struct sock *sk = sock->sk;
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struct sk_buff *skb;
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long amount;
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int err;
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BT_DBG("sk %p cmd %x arg %lx", sk, cmd, arg);
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switch (cmd) {
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case TIOCOUTQ:
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if (sk->sk_state == BT_LISTEN)
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return -EINVAL;
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amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
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if (amount < 0)
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amount = 0;
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err = put_user(amount, (int __user *) arg);
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break;
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case TIOCINQ:
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if (sk->sk_state == BT_LISTEN)
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return -EINVAL;
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lock_sock(sk);
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skb = skb_peek(&sk->sk_receive_queue);
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amount = skb ? skb->len : 0;
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release_sock(sk);
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err = put_user(amount, (int __user *) arg);
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break;
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case SIOCGSTAMP:
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err = sock_get_timestamp(sk, (struct timeval __user *) arg);
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break;
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case SIOCGSTAMPNS:
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err = sock_get_timestampns(sk, (struct timespec __user *) arg);
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break;
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default:
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err = -ENOIOCTLCMD;
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break;
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}
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return err;
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}
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EXPORT_SYMBOL(bt_sock_ioctl);
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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("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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