path: root/fs/ncpfs/sock.c

/*
 *  linux/fs/ncpfs/sock.c
 *
 *  Copyright (C) 1992, 1993  Rick Sladkey
 *
 *  Modified 1995, 1996 by Volker Lendecke to be usable for ncp
 *  Modified 1997 Peter Waltenberg, Bill Hawes, David Woodhouse for 2.1 dcache
 *
 */


#include <linux/time.h>
#include <linux/errno.h>
#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>
#include <linux/mm.h>
#include <linux/netdevice.h>
#include <linux/signal.h>
#include <net/scm.h>
#include <net/sock.h>
#include <linux/ipx.h>
#include <linux/poll.h>
#include <linux/file.h>

#include <linux/ncp_fs.h>

#include "ncpsign_kernel.h"

static int _recv(struct socket *sock, void *buf, int size, unsigned flags)
{
	struct msghdr msg = {NULL, };
	struct kvec iov = {buf, size};
	return kernel_recvmsg(sock, &msg, &iov, 1, size, flags);
}

static inline int do_send(struct socket *sock, struct kvec *vec, int count,
			  int len, unsigned flags)
{
	struct msghdr msg = { .msg_flags = flags };
	return kernel_sendmsg(sock, &msg, vec, count, len);
}

static int _send(struct socket *sock, const void *buff, int len)
{
	struct kvec vec;
	vec.iov_base = (void *) buff;
	vec.iov_len = len;
	return do_send(sock, &vec, 1, len, 0);
}

struct ncp_request_reply {
	struct list_head req;
	wait_queue_head_t wq;
	atomic_t refs;
	unsigned char* reply_buf;
	size_t datalen;
	int result;
	enum { RQ_DONE, RQ_INPROGRESS, RQ_QUEUED, RQ_IDLE, RQ_ABANDONED } status;
	struct kvec* tx_ciov;
	size_t tx_totallen;
	size_t tx_iovlen;
	struct kvec tx_iov[3];
	u_int16_t tx_type;
	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;

	server->data_ready(sk, len);
	schedule_work(&server->rcv.tq);
}

void ncp_tcp_error_report(struct sock *sk)
{
	struct ncp_server *server = sk->sk_user_data;
	
	server->error_report(sk);
	schedule_work(&server->rcv.tq);
}

void ncp_tcp_write_space(struct sock *sk)
{
	struct ncp_server *server = sk->sk_user_data;
	
	/* We do not need any locking: we first set tx.creq, and then we do sendmsg,
	   not vice versa... */
	server->write_space(sk);
	if (server->tx.creq)
		schedule_work(&server->tx.tq);
}

void ncpdgram_timeout_call(unsigned long v)
{
	struct ncp_server *server = (void*)v;
	
	schedule_work(&server->timeout_tq);
}

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 *req;

	ncp_invalidate_conn(server);
	del_timer(&server->timeout_tm);
	while (!list_empty(&server->tx.requests)) {
		req = list_entry(server->tx.requests.next, struct ncp_request_reply, req);
		
		list_del_init(&req->req);
		ncp_finish_request(server, req, -EIO);
	}
	req = server->rcv.creq;
	if (req) {
		server->rcv.creq = NULL;
		ncp_finish_request(server, req, -EIO);
		server->rcv.ptr = NULL;
		server->rcv.state = 0;
	}
	req = server->tx.creq;
	if (req)