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ncpfs: make sure server connection survives a kill

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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 2007-02-19 11:34:43 +01:00 committed by Pierre Ossman
parent c3442e2965
commit c5f93cf19d
3 changed files with 103 additions and 62 deletions
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16
fs/ncpfs/inode.c
View File

@ -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 @@ static int ncp_fill_super(struct super_block *sb, void *raw_data, int silent)
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
View File

@ -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;
}

2
include/linux/ncp_fs_sb.h
View File

@ -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;