ncpfs: make sure server connection survives a kill
Use internal buffers instead of the ones supplied by the caller so that a caller can be interrupted without having to abort the entire ncp connection. Signed-off-by: Pierre Ossman <ossman@cendio.se> Acked-by: Petr Vandrovec <petr@vandrovec.name>
This commit is contained in:
Pierre Ossman
Pierre Ossman
Родитель
c3442e2965
Коммит
c5f93cf19d
|
|
@ -576,6 +576,12 @@ static int ncp_fill_super(struct super_block *sb, void *raw_data, int silent)
|
|||
server->packet = vmalloc(NCP_PACKET_SIZE);
|
||||
if (server->packet == NULL)
|
||||
goto out_nls;
|
||||
server->txbuf = vmalloc(NCP_PACKET_SIZE);
|
||||
if (server->txbuf == NULL)
|
||||
goto out_packet;
|
||||
server->rxbuf = vmalloc(NCP_PACKET_SIZE);
|
||||
if (server->rxbuf == NULL)
|
||||
goto out_txbuf;
|
||||
|
||||
sock->sk->sk_data_ready = ncp_tcp_data_ready;
|
||||
sock->sk->sk_error_report = ncp_tcp_error_report;
|
||||
|
|
@ -597,7 +603,7 @@ static int ncp_fill_super(struct super_block *sb, void *raw_data, int silent)
|
|||
error = ncp_connect(server);
|
||||
ncp_unlock_server(server);
|
||||
if (error < 0)
|
||||
goto out_packet;
|
||||
goto out_rxbuf;
|
||||
DPRINTK("ncp_fill_super: NCP_SBP(sb) = %x\n", (int) NCP_SBP(sb));
|
||||
|
||||
error = -EMSGSIZE; /* -EREMOTESIDEINCOMPATIBLE */
|
||||
|
|
@ -666,8 +672,12 @@ out_disconnect:
|
|||
ncp_lock_server(server);
|
||||
ncp_disconnect(server);
|
||||
ncp_unlock_server(server);
|
||||
out_packet:
|
||||
out_rxbuf:
|
||||
ncp_stop_tasks(server);
|
||||
vfree(server->rxbuf);
|
||||
out_txbuf:
|
||||
vfree(server->txbuf);
|
||||
out_packet:
|
||||
vfree(server->packet);
|
||||
out_nls:
|
||||
#ifdef CONFIG_NCPFS_NLS
|
||||
|
|
@ -723,6 +733,8 @@ static void ncp_put_super(struct super_block *sb)
|
|||
|
||||
kfree(server->priv.data);
|
||||
kfree(server->auth.object_name);
|
||||
vfree(server->rxbuf);
|
||||
vfree(server->txbuf);
|
||||
vfree(server->packet);
|
||||
sb->s_fs_info = NULL;
|
||||
kfree(server);
|
||||
|
|
|
|||
147
fs/ncpfs/sock.c
147
fs/ncpfs/sock.c
|
|
@ -14,6 +14,7 @@
|
|||
#include <linux/socket.h>
|
||||
#include <linux/fcntl.h>
|
||||
#include <linux/stat.h>
|
||||
#include <linux/string.h>
|
||||
#include <asm/uaccess.h>
|
||||
#include <linux/in.h>
|
||||
#include <linux/net.h>
|
||||
|
|
@ -55,10 +56,11 @@ static int _send(struct socket *sock, const void *buff, int len)
|
|||
struct ncp_request_reply {
|
||||
struct list_head req;
|
||||
wait_queue_head_t wq;
|
||||
struct ncp_reply_header* reply_buf;
|
||||
atomic_t refs;
|
||||
unsigned char* reply_buf;
|
||||
size_t datalen;
|
||||
int result;
|
||||
enum { RQ_DONE, RQ_INPROGRESS, RQ_QUEUED, RQ_IDLE } status;
|
||||
enum { RQ_DONE, RQ_INPROGRESS, RQ_QUEUED, RQ_IDLE, RQ_ABANDONED } status;
|
||||
struct kvec* tx_ciov;
|
||||
size_t tx_totallen;
|
||||
size_t tx_iovlen;
|
||||
|
|
@ -67,6 +69,32 @@ struct ncp_request_reply {
|
|||
u_int32_t sign[6];
|
||||
};
|
||||
|
||||
static inline struct ncp_request_reply* ncp_alloc_req(void)
|
||||
{
|
||||
struct ncp_request_reply *req;
|
||||
|
||||
req = kmalloc(sizeof(struct ncp_request_reply), GFP_KERNEL);
|
||||
if (!req)
|
||||
return NULL;
|
||||
|
||||
init_waitqueue_head(&req->wq);
|
||||
atomic_set(&req->refs, (1));
|
||||
req->status = RQ_IDLE;
|
||||
|
||||
return req;
|
||||
}
|
||||
|
||||
static void ncp_req_get(struct ncp_request_reply *req)
|
||||
{
|
||||
atomic_inc(&req->refs);
|
||||
}
|
||||
|
||||
static void ncp_req_put(struct ncp_request_reply *req)
|
||||
{
|
||||
if (atomic_dec_and_test(&req->refs))
|
||||
kfree(req);
|
||||
}
|
||||
|
||||
void ncp_tcp_data_ready(struct sock *sk, int len)
|
||||
{
|
||||
struct ncp_server *server = sk->sk_user_data;
|
||||
|
|
@ -101,14 +129,17 @@ void ncpdgram_timeout_call(unsigned long v)
|
|||
schedule_work(&server->timeout_tq);
|
||||
}
|
||||
|
||||
static inline void ncp_finish_request(struct ncp_request_reply *req, int result)
|
||||
static inline void ncp_finish_request(struct ncp_server *server, struct ncp_request_reply *req, int result)
|
||||
{
|
||||
req->result = result;
|
||||
if (req->status != RQ_ABANDONED)
|
||||
memcpy(req->reply_buf, server->rxbuf, req->datalen);
|
||||
req->status = RQ_DONE;
|
||||
wake_up_all(&req->wq);
|
||||
ncp_req_put(req);
|
||||
}
|
||||
|
||||
static void __abort_ncp_connection(struct ncp_server *server, struct ncp_request_reply *aborted, int err)
|
||||
static void __abort_ncp_connection(struct ncp_server *server)
|
||||
{
|
||||
struct ncp_request_reply *req;
|
||||
|
||||
|
|
@ -118,31 +149,19 @@ static void __abort_ncp_connection(struct ncp_server *server, struct ncp_request
|
|||
req = list_entry(server->tx.requests.next, struct ncp_request_reply, req);
|
||||
|
||||
list_del_init(&req->req);
|
||||
if (req == aborted) {
|
||||
ncp_finish_request(req, err);
|
||||
} else {
|
||||
ncp_finish_request(req, -EIO);
|
||||
}
|
||||
ncp_finish_request(server, req, -EIO);
|
||||
}
|
||||
req = server->rcv.creq;
|
||||
if (req) {
|
||||
server->rcv.creq = NULL;
|
||||
if (req == aborted) {
|
||||
ncp_finish_request(req, err);
|
||||
} else {
|
||||
ncp_finish_request(req, -EIO);
|
||||
}
|
||||
ncp_finish_request(server, req, -EIO);
|
||||
server->rcv.ptr = NULL;
|
||||
server->rcv.state = 0;
|
||||
}
|
||||
req = server->tx.creq;
|
||||
if (req) {
|
||||
server->tx.creq = NULL;
|
||||
if (req == aborted) {
|
||||
ncp_finish_request(req, err);
|
||||
} else {
|
||||
ncp_finish_request(req, -EIO);
|
||||
}
|
||||
ncp_finish_request(server, req, -EIO);
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -160,10 +179,12 @@ static inline void __ncp_abort_request(struct ncp_server *server, struct ncp_req
|
|||
break;
|
||||
case RQ_QUEUED:
|
||||
list_del_init(&req->req);
|
||||
ncp_finish_request(req, err);
|
||||
ncp_finish_request(server, req, err);
|
||||
break;
|
||||
case RQ_INPROGRESS:
|
||||
__abort_ncp_connection(server, req, err);
|
||||
req->status = RQ_ABANDONED;
|
||||
break;
|
||||
case RQ_ABANDONED:
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
|
@ -177,7 +198,7 @@ static inline void ncp_abort_request(struct ncp_server *server, struct ncp_reque
|
|||
|
||||
static inline void __ncptcp_abort(struct ncp_server *server)
|
||||
{
|
||||
__abort_ncp_connection(server, NULL, 0);
|
||||
__abort_ncp_connection(server);
|
||||
}
|
||||
|
||||
static int ncpdgram_send(struct socket *sock, struct ncp_request_reply *req)
|
||||
|
|
@ -294,6 +315,11 @@ static void ncptcp_start_request(struct ncp_server *server, struct ncp_request_r
|
|||
|
||||
static inline void __ncp_start_request(struct ncp_server *server, struct ncp_request_reply *req)
|
||||
{
|
||||
/* we copy the data so that we do not depend on the caller
|
||||
staying alive */
|
||||
memcpy(server->txbuf, req->tx_iov[1].iov_base, req->tx_iov[1].iov_len);
|
||||
req->tx_iov[1].iov_base = server->txbuf;
|
||||
|
||||
if (server->ncp_sock->type == SOCK_STREAM)
|
||||
ncptcp_start_request(server, req);
|
||||
else
|
||||
|
|
@ -308,6 +334,7 @@ static int ncp_add_request(struct ncp_server *server, struct ncp_request_reply *
|
|||
printk(KERN_ERR "ncpfs: tcp: Server died\n");
|
||||
return -EIO;
|
||||
}
|
||||
ncp_req_get(req);
|
||||
if (server->tx.creq || server->rcv.creq) {
|
||||
req->status = RQ_QUEUED;
|
||||
list_add_tail(&req->req, &server->tx.requests);
|
||||
|
|
@ -409,7 +436,7 @@ void ncpdgram_rcv_proc(struct work_struct *work)
|
|||
server->timeout_last = NCP_MAX_RPC_TIMEOUT;
|
||||
mod_timer(&server->timeout_tm, jiffies + NCP_MAX_RPC_TIMEOUT);
|
||||
} else if (reply.type == NCP_REPLY) {
|
||||
result = _recv(sock, (void*)req->reply_buf, req->datalen, MSG_DONTWAIT);
|
||||
result = _recv(sock, server->rxbuf, req->datalen, MSG_DONTWAIT);
|
||||
#ifdef CONFIG_NCPFS_PACKET_SIGNING
|
||||
if (result >= 0 && server->sign_active && req->tx_type != NCP_DEALLOC_SLOT_REQUEST) {
|
||||
if (result < 8 + 8) {
|
||||
|
|
@ -419,7 +446,7 @@ void ncpdgram_rcv_proc(struct work_struct *work)
|
|||
|
||||
result -= 8;
|
||||
hdrl = sock->sk->sk_family == AF_INET ? 8 : 6;
|
||||
if (sign_verify_reply(server, ((char*)req->reply_buf) + hdrl, result - hdrl, cpu_to_le32(result), ((char*)req->reply_buf) + result)) {
|
||||
if (sign_verify_reply(server, server->rxbuf + hdrl, result - hdrl, cpu_to_le32(result), server->rxbuf + result)) {
|
||||
printk(KERN_INFO "ncpfs: Signature violation\n");
|
||||
result = -EIO;
|
||||
}
|
||||
|
|
@ -428,7 +455,7 @@ void ncpdgram_rcv_proc(struct work_struct *work)
|
|||
#endif
|
||||
del_timer(&server->timeout_tm);
|
||||
server->rcv.creq = NULL;
|
||||
ncp_finish_request(req, result);
|
||||
ncp_finish_request(server, req, result);
|
||||
__ncp_next_request(server);
|
||||
mutex_unlock(&server->rcv.creq_mutex);
|
||||
continue;
|
||||
|
|
@ -478,12 +505,6 @@ void ncpdgram_timeout_proc(struct work_struct *work)
|
|||
mutex_unlock(&server->rcv.creq_mutex);
|
||||
}
|
||||
|
||||
static inline void ncp_init_req(struct ncp_request_reply* req)
|
||||
{
|
||||
init_waitqueue_head(&req->wq);
|
||||
req->status = RQ_IDLE;
|
||||
}
|
||||
|
||||
static int do_tcp_rcv(struct ncp_server *server, void *buffer, size_t len)
|
||||
{
|
||||
int result;
|
||||
|
|
@ -601,8 +622,8 @@ skipdata:;
|
|||
goto skipdata;
|
||||
}
|
||||
req->datalen = datalen - 8;
|
||||
req->reply_buf->type = NCP_REPLY;
|
||||
server->rcv.ptr = (unsigned char*)(req->reply_buf) + 2;
|
||||
((struct ncp_reply_header*)server->rxbuf)->type = NCP_REPLY;
|
||||
server->rcv.ptr = server->rxbuf + 2;
|
||||
server->rcv.len = datalen - 10;
|
||||
server->rcv.state = 1;
|
||||
break;
|
||||
|
|
@ -615,12 +636,12 @@ skipdata:;
|
|||
case 1:
|
||||
req = server->rcv.creq;
|
||||
if (req->tx_type != NCP_ALLOC_SLOT_REQUEST) {
|
||||
if (req->reply_buf->sequence != server->sequence) {
|
||||
if (((struct ncp_reply_header*)server->rxbuf)->sequence != server->sequence) {
|
||||
printk(KERN_ERR "ncpfs: tcp: Bad sequence number\n");
|
||||
__ncp_abort_request(server, req, -EIO);
|
||||
return -EIO;
|
||||
}
|
||||
if ((req->reply_buf->conn_low | (req->reply_buf->conn_high << 8)) != server->connection) {
|
||||
if ((((struct ncp_reply_header*)server->rxbuf)->conn_low | (((struct ncp_reply_header*)server->rxbuf)->conn_high << 8)) != server->connection) {
|
||||
printk(KERN_ERR "ncpfs: tcp: Connection number mismatch\n");
|
||||
__ncp_abort_request(server, req, -EIO);
|
||||
return -EIO;
|
||||
|
|
@ -628,14 +649,14 @@ skipdata:;
|
|||
}
|
||||
#ifdef CONFIG_NCPFS_PACKET_SIGNING
|
||||
if (server->sign_active && req->tx_type != NCP_DEALLOC_SLOT_REQUEST) {
|
||||
if (sign_verify_reply(server, (unsigned char*)(req->reply_buf) + 6, req->datalen - 6, cpu_to_be32(req->datalen + 16), &server->rcv.buf.type)) {
|
||||
if (sign_verify_reply(server, server->rxbuf + 6, req->datalen - 6, cpu_to_be32(req->datalen + 16), &server->rcv.buf.type)) {
|
||||
printk(KERN_ERR "ncpfs: tcp: Signature violation\n");
|
||||
__ncp_abort_request(server, req, -EIO);
|
||||
return -EIO;
|
||||
}
|
||||
}
|
||||
#endif
|
||||
ncp_finish_request(req, req->datalen);
|
||||
ncp_finish_request(server, req, req->datalen);
|
||||
nextreq:;
|
||||
__ncp_next_request(server);
|
||||
case 2:
|
||||
|
|
@ -645,7 +666,7 @@ skipdata:;
|
|||
server->rcv.state = 0;
|
||||
break;
|
||||
case 3:
|
||||
ncp_finish_request(server->rcv.creq, -EIO);
|
||||
ncp_finish_request(server, server->rcv.creq, -EIO);
|
||||
goto nextreq;
|
||||
case 5:
|
||||
info_server(server, 0, server->unexpected_packet.data, server->unexpected_packet.len);
|
||||
|
|
@ -675,28 +696,39 @@ void ncp_tcp_tx_proc(struct work_struct *work)
|
|||
}
|
||||
|
||||
static int do_ncp_rpc_call(struct ncp_server *server, int size,
|
||||
struct ncp_reply_header* reply_buf, int max_reply_size)
|
||||
unsigned char* reply_buf, int max_reply_size)
|
||||
{
|
||||
int result;
|
||||
struct ncp_request_reply req;
|
||||
struct ncp_request_reply *req;
|
||||
|
||||
ncp_init_req(&req);
|
||||
req.reply_buf = reply_buf;
|
||||
req.datalen = max_reply_size;
|
||||
req.tx_iov[1].iov_base = server->packet;
|
||||
req.tx_iov[1].iov_len = size;
|
||||
req.tx_iovlen = 1;
|
||||
req.tx_totallen = size;
|
||||
req.tx_type = *(u_int16_t*)server->packet;
|
||||
req = ncp_alloc_req();
|
||||
if (!req)
|
||||
return -ENOMEM;
|
||||
|
||||
result = ncp_add_request(server, &req);
|
||||
if (result < 0) {
|
||||
return result;
|
||||
req->reply_buf = reply_buf;
|
||||
req->datalen = max_reply_size;
|
||||
req->tx_iov[1].iov_base = server->packet;
|
||||
req->tx_iov[1].iov_len = size;
|
||||
req->tx_iovlen = 1;
|
||||
req->tx_totallen = size;
|
||||
req->tx_type = *(u_int16_t*)server->packet;
|
||||
|
||||
result = ncp_add_request(server, req);
|
||||
if (result < 0)
|
||||
goto out;
|
||||
|
||||
if (wait_event_interruptible(req->wq, req->status == RQ_DONE)) {
|
||||
ncp_abort_request(server, req, -EINTR);
|
||||
result = -EINTR;
|
||||
goto out;
|
||||
}
|
||||
if (wait_event_interruptible(req.wq, req.status == RQ_DONE)) {
|
||||
ncp_abort_request(server, &req, -EIO);
|
||||
}
|
||||
return req.result;
|
||||
|
||||
result = req->result;
|
||||
|
||||
out:
|
||||
ncp_req_put(req);
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -751,11 +783,6 @@ static int ncp_do_request(struct ncp_server *server, int size,
|
|||
|
||||
DDPRINTK("do_ncp_rpc_call returned %d\n", result);
|
||||
|
||||
if (result < 0) {
|
||||
/* There was a problem with I/O, so the connections is
|
||||
* no longer usable. */
|
||||
ncp_invalidate_conn(server);
|
||||
}
|
||||
return result;
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -50,6 +50,8 @@ struct ncp_server {
|
|||
int packet_size;
|
||||
unsigned char *packet; /* Here we prepare requests and
|
||||
receive replies */
|
||||
unsigned char *txbuf; /* Storage for current request */
|
||||
unsigned char *rxbuf; /* Storage for reply to current request */
|
||||
|
||||
int lock; /* To prevent mismatch in protocols. */
|
||||
struct mutex mutex;
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче