mirror of
https://github.com/AetherDroid/android_kernel_samsung_on5xelte.git
synced 2025-09-10 01:12:45 -04:00
Fixed MTP to work with TWRP
This commit is contained in:
awab228
commit
f6dfaef42e
50820 changed files with 20846062 additions and 0 deletions
310
net/rxrpc/ar-local.c
Normal file
310
net/rxrpc/ar-local.c
Normal file
|
|
@ -0,0 +1,310 @@
|
|||
/* AF_RXRPC local endpoint management
|
||||
*
|
||||
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
|
||||
* Written by David Howells (dhowells@redhat.com)
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU General Public License
|
||||
* as published by the Free Software Foundation; either version
|
||||
* 2 of the License, or (at your option) any later version.
|
||||
*/
|
||||
|
||||
#include <linux/module.h>
|
||||
#include <linux/net.h>
|
||||
#include <linux/skbuff.h>
|
||||
#include <linux/slab.h>
|
||||
#include <net/sock.h>
|
||||
#include <net/af_rxrpc.h>
|
||||
#include "ar-internal.h"
|
||||
|
||||
static LIST_HEAD(rxrpc_locals);
|
||||
DEFINE_RWLOCK(rxrpc_local_lock);
|
||||
static DECLARE_RWSEM(rxrpc_local_sem);
|
||||
static DECLARE_WAIT_QUEUE_HEAD(rxrpc_local_wq);
|
||||
|
||||
static void rxrpc_destroy_local(struct work_struct *work);
|
||||
|
||||
/*
|
||||
* allocate a new local
|
||||
*/
|
||||
static
|
||||
struct rxrpc_local *rxrpc_alloc_local(struct sockaddr_rxrpc *srx)
|
||||
{
|
||||
struct rxrpc_local *local;
|
||||
|
||||
local = kzalloc(sizeof(struct rxrpc_local), GFP_KERNEL);
|
||||
if (local) {
|
||||
INIT_WORK(&local->destroyer, &rxrpc_destroy_local);
|
||||
INIT_WORK(&local->acceptor, &rxrpc_accept_incoming_calls);
|
||||
INIT_WORK(&local->rejecter, &rxrpc_reject_packets);
|
||||
INIT_LIST_HEAD(&local->services);
|
||||
INIT_LIST_HEAD(&local->link);
|
||||
init_rwsem(&local->defrag_sem);
|
||||
skb_queue_head_init(&local->accept_queue);
|
||||
skb_queue_head_init(&local->reject_queue);
|
||||
spin_lock_init(&local->lock);
|
||||
rwlock_init(&local->services_lock);
|
||||
atomic_set(&local->usage, 1);
|
||||
local->debug_id = atomic_inc_return(&rxrpc_debug_id);
|
||||
memcpy(&local->srx, srx, sizeof(*srx));
|
||||
}
|
||||
|
||||
_leave(" = %p", local);
|
||||
return local;
|
||||
}
|
||||
|
||||
/*
|
||||
* create the local socket
|
||||
* - must be called with rxrpc_local_sem writelocked
|
||||
*/
|
||||
static int rxrpc_create_local(struct rxrpc_local *local)
|
||||
{
|
||||
struct sock *sock;
|
||||
int ret, opt;
|
||||
|
||||
_enter("%p{%d}", local, local->srx.transport_type);
|
||||
|
||||
/* create a socket to represent the local endpoint */
|
||||
ret = sock_create_kern(PF_INET, local->srx.transport_type, IPPROTO_UDP,
|
||||
&local->socket);
|
||||
if (ret < 0) {
|
||||
_leave(" = %d [socket]", ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* if a local address was supplied then bind it */
|
||||
if (local->srx.transport_len > sizeof(sa_family_t)) {
|
||||
_debug("bind");
|
||||
ret = kernel_bind(local->socket,
|
||||
(struct sockaddr *) &local->srx.transport,
|
||||
local->srx.transport_len);
|
||||
if (ret < 0) {
|
||||
_debug("bind failed");
|
||||
goto error;
|
||||
}
|
||||
}
|
||||
|
||||
/* we want to receive ICMP errors */
|
||||
opt = 1;
|
||||
ret = kernel_setsockopt(local->socket, SOL_IP, IP_RECVERR,
|
||||
(char *) &opt, sizeof(opt));
|
||||
if (ret < 0) {
|
||||
_debug("setsockopt failed");
|
||||
goto error;
|
||||
}
|
||||
|
||||
/* we want to set the don't fragment bit */
|
||||
opt = IP_PMTUDISC_DO;
|
||||
ret = kernel_setsockopt(local->socket, SOL_IP, IP_MTU_DISCOVER,
|
||||
(char *) &opt, sizeof(opt));
|
||||
if (ret < 0) {
|
||||
_debug("setsockopt failed");
|
||||
goto error;
|
||||
}
|
||||
|
||||
write_lock_bh(&rxrpc_local_lock);
|
||||
list_add(&local->link, &rxrpc_locals);
|
||||
write_unlock_bh(&rxrpc_local_lock);
|
||||
|
||||
/* set the socket up */
|
||||
sock = local->socket->sk;
|
||||
sock->sk_user_data = local;
|
||||
sock->sk_data_ready = rxrpc_data_ready;
|
||||
sock->sk_error_report = rxrpc_UDP_error_report;
|
||||
_leave(" = 0");
|
||||
return 0;
|
||||
|
||||
error:
|
||||
kernel_sock_shutdown(local->socket, SHUT_RDWR);
|
||||
local->socket->sk->sk_user_data = NULL;
|
||||
sock_release(local->socket);
|
||||
local->socket = NULL;
|
||||
|
||||
_leave(" = %d", ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/*
|
||||
* create a new local endpoint using the specified UDP address
|
||||
*/
|
||||
struct rxrpc_local *rxrpc_lookup_local(struct sockaddr_rxrpc *srx)
|
||||
{
|
||||
struct rxrpc_local *local;
|
||||
int ret;
|
||||
|
||||
_enter("{%d,%u,%pI4+%hu}",
|
||||
srx->transport_type,
|
||||
srx->transport.family,
|
||||
&srx->transport.sin.sin_addr,
|
||||
ntohs(srx->transport.sin.sin_port));
|
||||
|
||||
down_write(&rxrpc_local_sem);
|
||||
|
||||
/* see if we have a suitable local local endpoint already */
|
||||
read_lock_bh(&rxrpc_local_lock);
|
||||
|
||||
list_for_each_entry(local, &rxrpc_locals, link) {
|
||||
_debug("CMP {%d,%u,%pI4+%hu}",
|
||||
local->srx.transport_type,
|
||||
local->srx.transport.family,
|
||||
&local->srx.transport.sin.sin_addr,
|
||||
ntohs(local->srx.transport.sin.sin_port));
|
||||
|
||||
if (local->srx.transport_type != srx->transport_type ||
|
||||
local->srx.transport.family != srx->transport.family)
|
||||
continue;
|
||||
|
||||
switch (srx->transport.family) {
|
||||
case AF_INET:
|
||||
if (local->srx.transport.sin.sin_port !=
|
||||
srx->transport.sin.sin_port)
|
||||
continue;
|
||||
if (memcmp(&local->srx.transport.sin.sin_addr,
|
||||
&srx->transport.sin.sin_addr,
|
||||
sizeof(struct in_addr)) != 0)
|
||||
continue;
|
||||
goto found_local;
|
||||
|
||||
default:
|
||||
BUG();
|
||||
}
|
||||
}
|
||||
|
||||
read_unlock_bh(&rxrpc_local_lock);
|
||||
|
||||
/* we didn't find one, so we need to create one */
|
||||
local = rxrpc_alloc_local(srx);
|
||||
if (!local) {
|
||||
up_write(&rxrpc_local_sem);
|
||||
return ERR_PTR(-ENOMEM);
|
||||
}
|
||||
|
||||
ret = rxrpc_create_local(local);
|
||||
if (ret < 0) {
|
||||
up_write(&rxrpc_local_sem);
|
||||
kfree(local);
|
||||
_leave(" = %d", ret);
|
||||
return ERR_PTR(ret);
|
||||
}
|
||||
|
||||
up_write(&rxrpc_local_sem);
|
||||
|
||||
_net("LOCAL new %d {%d,%u,%pI4+%hu}",
|
||||
local->debug_id,
|
||||
local->srx.transport_type,
|
||||
local->srx.transport.family,
|
||||
&local->srx.transport.sin.sin_addr,
|
||||
ntohs(local->srx.transport.sin.sin_port));
|
||||
|
||||
_leave(" = %p [new]", local);
|
||||
return local;
|
||||
|
||||
found_local:
|
||||
rxrpc_get_local(local);
|
||||
read_unlock_bh(&rxrpc_local_lock);
|
||||
up_write(&rxrpc_local_sem);
|
||||
|
||||
_net("LOCAL old %d {%d,%u,%pI4+%hu}",
|
||||
local->debug_id,
|
||||
local->srx.transport_type,
|
||||
local->srx.transport.family,
|
||||
&local->srx.transport.sin.sin_addr,
|
||||
ntohs(local->srx.transport.sin.sin_port));
|
||||
|
||||
_leave(" = %p [reuse]", local);
|
||||
return local;
|
||||
}
|
||||
|
||||
/*
|
||||
* release a local endpoint
|
||||
*/
|
||||
void rxrpc_put_local(struct rxrpc_local *local)
|
||||
{
|
||||
_enter("%p{u=%d}", local, atomic_read(&local->usage));
|
||||
|
||||
ASSERTCMP(atomic_read(&local->usage), >, 0);
|
||||
|
||||
/* to prevent a race, the decrement and the dequeue must be effectively
|
||||
* atomic */
|
||||
write_lock_bh(&rxrpc_local_lock);
|
||||
if (unlikely(atomic_dec_and_test(&local->usage))) {
|
||||
_debug("destroy local");
|
||||
rxrpc_queue_work(&local->destroyer);
|
||||
}
|
||||
write_unlock_bh(&rxrpc_local_lock);
|
||||
_leave("");
|
||||
}
|
||||
|
||||
/*
|
||||
* destroy a local endpoint
|
||||
*/
|
||||
static void rxrpc_destroy_local(struct work_struct *work)
|
||||
{
|
||||
struct rxrpc_local *local =
|
||||
container_of(work, struct rxrpc_local, destroyer);
|
||||
|
||||
_enter("%p{%d}", local, atomic_read(&local->usage));
|
||||
|
||||
down_write(&rxrpc_local_sem);
|
||||
|
||||
write_lock_bh(&rxrpc_local_lock);
|
||||
if (atomic_read(&local->usage) > 0) {
|
||||
write_unlock_bh(&rxrpc_local_lock);
|
||||
up_read(&rxrpc_local_sem);
|
||||
_leave(" [resurrected]");
|
||||
return;
|
||||
}
|
||||
|
||||
list_del(&local->link);
|
||||
local->socket->sk->sk_user_data = NULL;
|
||||
write_unlock_bh(&rxrpc_local_lock);
|
||||
|
||||
downgrade_write(&rxrpc_local_sem);
|
||||
|
||||
ASSERT(list_empty(&local->services));
|
||||
ASSERT(!work_pending(&local->acceptor));
|
||||
ASSERT(!work_pending(&local->rejecter));
|
||||
|
||||
/* finish cleaning up the local descriptor */
|
||||
rxrpc_purge_queue(&local->accept_queue);
|
||||
rxrpc_purge_queue(&local->reject_queue);
|
||||
kernel_sock_shutdown(local->socket, SHUT_RDWR);
|
||||
sock_release(local->socket);
|
||||
|
||||
up_read(&rxrpc_local_sem);
|
||||
|
||||
_net("DESTROY LOCAL %d", local->debug_id);
|
||||
kfree(local);
|
||||
|
||||
if (list_empty(&rxrpc_locals))
|
||||
wake_up_all(&rxrpc_local_wq);
|
||||
|
||||
_leave("");
|
||||
}
|
||||
|
||||
/*
|
||||
* preemptively destroy all local local endpoint rather than waiting for
|
||||
* them to be destroyed
|
||||
*/
|
||||
void __exit rxrpc_destroy_all_locals(void)
|
||||
{
|
||||
DECLARE_WAITQUEUE(myself,current);
|
||||
|
||||
_enter("");
|
||||
|
||||
/* we simply have to wait for them to go away */
|
||||
if (!list_empty(&rxrpc_locals)) {
|
||||
set_current_state(TASK_UNINTERRUPTIBLE);
|
||||
add_wait_queue(&rxrpc_local_wq, &myself);
|
||||
|
||||
while (!list_empty(&rxrpc_locals)) {
|
||||
schedule();
|
||||
set_current_state(TASK_UNINTERRUPTIBLE);
|
||||
}
|
||||
|
||||
remove_wait_queue(&rxrpc_local_wq, &myself);
|
||||
set_current_state(TASK_RUNNING);
|
||||
}
|
||||
|
||||
_leave("");
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue