[deliverable/linux.git] / net / ipv4 / ipvs / ip_vs_ftp.c

/*
 * ip_vs_ftp.c: IPVS ftp application module
 *
 * Authors:	Wensong Zhang <wensong@linuxvirtualserver.org>
 *
 * Changes:
 *
 *
 *	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.
 *
 * Most code here is taken from ip_masq_ftp.c in kernel 2.2. The difference
 * is that ip_vs_ftp module handles the reverse direction to ip_masq_ftp.
 *
 *		IP_MASQ_FTP ftp masquerading module
 *
 * Version:	@(#)ip_masq_ftp.c 0.04   02/05/96
 *
 * Author:	Wouter Gadeyne
 *
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/netfilter.h>
#include <net/protocol.h>
#include <net/tcp.h>
#include <asm/unaligned.h>

#include <net/ip_vs.h>


#define SERVER_STRING "227 Entering Passive Mode ("
#define CLIENT_STRING "PORT "


/*
 * List of ports (up to IP_VS_APP_MAX_PORTS) to be handled by helper
 * First port is set to the default port.
 */
static unsigned short ports[IP_VS_APP_MAX_PORTS] = {21, 0};
module_param_array(ports, ushort, NULL, 0);
MODULE_PARM_DESC(ports, "Ports to monitor for FTP control commands");


/*	Dummy variable */
static int ip_vs_ftp_pasv;


static int
ip_vs_ftp_init_conn(struct ip_vs_app *app, struct ip_vs_conn *cp)
{
	return 0;
}


static int
ip_vs_ftp_done_conn(struct ip_vs_app *app, struct ip_vs_conn *cp)
{
	return 0;
}


/*
 * Get <addr,port> from the string "xxx.xxx.xxx.xxx,ppp,ppp", started
 * with the "pattern" and terminated with the "term" character.
 * <addr,port> is in network order.
 */
static int ip_vs_ftp_get_addrport(char *data, char *data_limit,
				  const char *pattern, size_t plen, char term,
				  __be32 *addr, __be16 *port,
				  char **start, char **end)
{
	unsigned char p[6];
	int i = 0;

	if (data_limit - data < plen) {
		/* check if there is partial match */
		if (strnicmp(data, pattern, data_limit - data) == 0)
			return -1;
		else
			return 0;
	}

	if (strnicmp(data, pattern, plen) != 0) {
		return 0;
	}
	*start = data + plen;

	for (data = *start; *data != term; data++) {
		if (data == data_limit)
			return -1;
	}
	*end = data;

	memset(p, 0, sizeof(p));
	for (data = *start; data != *end; data++) {
		if (*data >= '0' && *data <= '9') {
			p[i] = p[i]*10 + *data - '0';
		} else if (*data == ',' && i < 5) {
			i++;
		} else {
			/* unexpected character */
			return -1;
		}
	}

	if (i != 5)
		return -1;

	*addr = get_unaligned((__be32 *)p);
	*port = get_unaligned((__be16 *)(p + 4));
	return 1;
}


/*
 * Look at outgoing ftp packets to catch the response to a PASV command
 * from the server (inside-to-outside).
 * When we see one, we build a connection entry with the client address,
 * client port 0 (unknown at the moment), the server address and the
 * server port.  Mark the current connection entry as a control channel
 * of the new entry. All this work is just to make the data connection
 * can be scheduled to the right server later.
 *
 * The outgoing packet should be something like
 *   "227 Entering Passive Mode (xxx,xxx,xxx,xxx,ppp,ppp)".
 * xxx,xxx,xxx,xxx is the server address, ppp,ppp is the server port number.
 */
static int ip_vs_ftp_out(struct ip_vs_app *app, struct ip_vs_conn *cp,
			 struct sk_buff *skb, int *diff)
{
	struct iphdr *iph;
	struct tcphdr *th;
	char *data, *data_limit;
	char *start, *end;
	__be32 from;
	__be16 port;
	struct ip_vs_conn *n_cp;
	char buf[24];		/* xxx.xxx.xxx.xxx,ppp,ppp\000 */
	unsigned buf_len;
	int ret;

	*diff = 0;

	/* Only useful for established sessions */
	if (cp->state != IP_VS_TCP_S_ESTABLISHED)
		return 1;

	/* Linear packets are much easier to deal with. */
	if (!skb_make_writable(skb, skb->len))
		return 0;

	if (cp->app_data == &ip_vs_ftp_pasv) {
		iph = ip_hdr(skb);
		th = (struct tcphdr *)&(((char *)iph)[iph->ihl*4]);
		data = (char *)th + (th->doff << 2);
		data_limit = skb_tail_pointer(skb);

		if (ip_vs_ftp_get_addrport(data, data_limit,
					   SERVER_STRING,
					   sizeof(SERVER_STRING)-1, ')',
					   &from, &port,
					   &start, &end) != 1)
			return 1;

		IP_VS_DBG(7, "PASV response (%u.%u.%u.%u:%d) -> "
			  "%u.%u.%u.%u:%d detected\n",
			  NIPQUAD(from), ntohs(port), NIPQUAD(cp->caddr), 0);

		/*
		 * Now update or create an connection entry for it
		 */
		n_cp = ip_vs_conn_out_get(iph->protocol, from, port,
					  cp->caddr, 0);
		if (!n_cp) {
			n_cp = ip_vs_conn_new(IPPROTO_TCP,
					      cp->caddr, 0,
					      cp->vaddr, port,
					      from, port,
					      IP_VS_CONN_F_NO_CPORT,
					      cp->dest);
			if (!n_cp)
				return 0;

			/* add its controller */
			ip_vs_control_add(n_cp, cp);
		}

		/*
		 * Replace the old passive address with the new one
		 */
		from = n_cp->vaddr;
		port = n_cp->vport;
		sprintf(buf,"%d,%d,%d,%d,%d,%d", NIPQUAD(from),
			(ntohs(port)>>8)&255, ntohs(port)&255);
		buf_len = strlen(buf);

		/*
		 * Calculate required delta-offset to keep TCP happy
		 */
		*diff = buf_len - (end-start);

		if (*diff == 0) {
			/* simply replace it with new passive address */
			memcpy(start, buf, buf_len);
			ret = 1;
		} else {
			ret = !ip_vs_skb_replace(skb, GFP_ATOMIC, start,
					  end-start, buf, buf_len);
		}

		cp->app_data = NULL;
		ip_vs_tcp_conn_listen(n_cp);
		ip_vs_conn_put(n_cp);
		return ret;
	}
	return 1;
}


/*
 * Look at incoming ftp packets to catch the PASV/PORT command
 * (outside-to-inside).
 *
 * The incoming packet having the PORT command should be something like
 *      "PORT xxx,xxx,xxx,xxx,ppp,ppp\n".
 * xxx,xxx,xxx,xxx is the client address, ppp,ppp is the client port number.
 * In this case, we create a connection entry using the client address and
 * port, so that the active ftp data connection from the server can reach
 * the client.
 */
static int ip_vs_ftp_in(struct ip_vs_app *app, struct ip_vs_conn *cp,
			struct sk_buff *skb, int *diff)
{
	struct iphdr *iph;
	struct tcphdr *th;
	char *data, *data_start, *data_limit;
	char *start, *end;
	__be32 to;
	__be16 port;
	struct ip_vs_conn *n_cp;

	/* no diff required for incoming packets */
	*diff = 0;

	/* Only useful for established sessions */
	if (cp->state != IP_VS_TCP_S_ESTABLISHED)
		return 1;

	/* Linear packets are much easier to deal with. */
	if (!skb_make_writable(skb, skb->len))
		return 0;

	/*
	 * Detecting whether it is passive
	 */
	iph = ip_hdr(skb);
	th = (struct tcphdr *)&(((char *)iph)[iph->ihl*4]);

	/* Since there may be OPTIONS in the TCP packet and the HLEN is
	   the length of the header in 32-bit multiples, it is accurate
	   to calculate data address by th+HLEN*4 */
	data = data_start = (char *)th + (th->doff << 2);
	data_limit = skb_tail_pointer(skb);

	while (data <= data_limit - 6) {
		if (strnicmp(data, "PASV\r\n", 6) == 0) {
			/* Passive mode on */
			IP_VS_DBG(7, "got PASV at %td of %td\n",
				  data - data_start,
				  data_limit - data_start);
			cp->app_data = &ip_vs_ftp_pasv;
			return 1;
		}
		data++;
	}

	/*
	 * To support virtual FTP server, the scenerio is as follows:
	 *       FTP client ----> Load Balancer ----> FTP server
	 * First detect the port number in the application data,
	 * then create a new connection entry for the coming data
	 * connection.
	 */
	if (ip_vs_ftp_get_addrport(data_start, data_limit,
				   CLIENT_STRING, sizeof(CLIENT_STRING)-1,
				   '\r', &to, &port,
				   &start, &end) != 1)
		return 1;

	IP_VS_DBG(7, "PORT %u.%u.%u.%u:%d detected\n",
		  NIPQUAD(to), ntohs(port));

	/* Passive mode off */
	cp->app_data = NULL;

	/*
	 * Now update or create a connection entry for it
	 */
	IP_VS_DBG(7, "protocol %s %u.%u.%u.%u:%d %u.%u.%u.%u:%d\n",
		  ip_vs_proto_name(iph->protocol),
		  NIPQUAD(to), ntohs(port), NIPQUAD(cp->vaddr), 0);

	n_cp = ip_vs_conn_in_get(iph->protocol,
				 to, port,
				 cp->vaddr, htons(ntohs(cp->vport)-1));
	if (!n_cp) {
		n_cp = ip_vs_conn_new(IPPROTO_TCP,
				      to, port,
				      cp->vaddr, htons(ntohs(cp->vport)-1),
				      cp->daddr, htons(ntohs(cp->dport)-1),
				      0,
				      cp->dest);
		if (!n_cp)
			return 0;

		/* add its controller */
		ip_vs_control_add(n_cp, cp);
	}

	/*
	 *	Move tunnel to listen state
	 */
	ip_vs_tcp_conn_listen(n_cp);
	ip_vs_conn_put(n_cp);

	return 1;
}


static struct ip_vs_app ip_vs_ftp = {
	.name =		"ftp",
	.type =		IP_VS_APP_TYPE_FTP,
	.protocol =	IPPROTO_TCP,
	.module =	THIS_MODULE,
	.incs_list =	LIST_HEAD_INIT(ip_vs_ftp.incs_list),
	.init_conn =	ip_vs_ftp_init_conn,
	.done_conn =	ip_vs_ftp_done_conn,
	.bind_conn =	NULL,
	.unbind_conn =	NULL,
	.pkt_out =	ip_vs_ftp_out,
	.pkt_in =	ip_vs_ftp_in,
};


/*
 *	ip_vs_ftp initialization
 */
static int __init ip_vs_ftp_init(void)
{
	int i, ret;
	struct ip_vs_app *app = &ip_vs_ftp;

	ret = register_ip_vs_app(app);
	if (ret)
		return ret;

	for (i=0; i<IP_VS_APP_MAX_PORTS; i++) {
		if (!ports[i])
			continue;
		ret = register_ip_vs_app_inc(app, app->protocol, ports[i]);
		if (ret)
			break;
		IP_VS_INFO("%s: loaded support on port[%d] = %d\n",
			   app->name, i, ports[i]);
	}

	if (ret)
		unregister_ip_vs_app(app);

	return ret;
}


/*
 *	ip_vs_ftp finish.
 */
static void __exit ip_vs_ftp_exit(void)
{
	unregister_ip_vs_app(&ip_vs_ftp);
}


module_init(ip_vs_ftp_init);
module_exit(ip_vs_ftp_exit);
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* ip_vs_ftp.c: IPVS ftp application module
	3	*
1da177e4 LT	4	* Authors: Wensong Zhang <wensong@linuxvirtualserver.org>
	5	*
	6	* Changes:
	7	*
	8	*
	9	* This program is free software; you can redistribute it and/or
	10	* modify it under the terms of the GNU General Public License
	11	* as published by the Free Software Foundation; either version
	12	* 2 of the License, or (at your option) any later version.
	13	*
	14	* Most code here is taken from ip_masq_ftp.c in kernel 2.2. The difference
	15	* is that ip_vs_ftp module handles the reverse direction to ip_masq_ftp.
	16	*
	17	* IP_MASQ_FTP ftp masquerading module
	18	*
	19	* Version: @(#)ip_masq_ftp.c 0.04 02/05/96
	20	*
	21	* Author: Wouter Gadeyne
	22	*
	23	*/
	24
	25	#include <linux/module.h>
	26	#include <linux/moduleparam.h>
	27	#include <linux/kernel.h>
	28	#include <linux/skbuff.h>
	29	#include <linux/in.h>
	30	#include <linux/ip.h>
af1e1cf0	31	#include <linux/netfilter.h>
1da177e4 LT	32	#include <net/protocol.h>
1da177e4 LT	33	#include <net/tcp.h>
96d2ca4e	34	#include <asm/unaligned.h>
1da177e4 LT	35
	36	#include <net/ip_vs.h>
	37
	38
	39	#define SERVER_STRING "227 Entering Passive Mode ("
	40	#define CLIENT_STRING "PORT "
	41
	42
	43	/*
	44	* List of ports (up to IP_VS_APP_MAX_PORTS) to be handled by helper
	45	* First port is set to the default port.
	46	*/
28b06c38 SH	47	static unsigned short ports[IP_VS_APP_MAX_PORTS] = {21, 0};
28b06c38 SH	48	module_param_array(ports, ushort, NULL, 0);
70e76b76	49	MODULE_PARM_DESC(ports, "Ports to monitor for FTP control commands");
1da177e4	50
1da177e4 LT	51
	52	/* Dummy variable */
	53	static int ip_vs_ftp_pasv;
	54
	55
	56	static int
	57	ip_vs_ftp_init_conn(struct ip_vs_app app, struct ip_vs_conn cp)
	58	{
	59	return 0;
	60	}
	61
	62
	63	static int
	64	ip_vs_ftp_done_conn(struct ip_vs_app app, struct ip_vs_conn cp)
	65	{
	66	return 0;
	67	}
	68
	69
	70	/*
	71	* Get <addr,port> from the string "xxx.xxx.xxx.xxx,ppp,ppp", started
	72	* with the "pattern" and terminated with the "term" character.
	73	* <addr,port> is in network order.
	74	*/
	75	static int ip_vs_ftp_get_addrport(char data, char data_limit,
	76	const char *pattern, size_t plen, char term,
014d730d	77	__be32 addr, __be16 port,
1da177e4 LT	78	char start, char end)
	79	{
	80	unsigned char p[6];
	81	int i = 0;
	82
	83	if (data_limit - data < plen) {
	84	/* check if there is partial match */
	85	if (strnicmp(data, pattern, data_limit - data) == 0)
	86	return -1;
	87	else
	88	return 0;
	89	}
	90
	91	if (strnicmp(data, pattern, plen) != 0) {
	92	return 0;
	93	}
	94	*start = data + plen;
	95
	96	for (data = start; data != term; data++) {
	97	if (data == data_limit)
	98	return -1;
	99	}
	100	*end = data;
	101
	102	memset(p, 0, sizeof(p));
	103	for (data = start; data != end; data++) {
	104	if (data >= '0' && data <= '9') {
	105	p[i] = p[i]10 + data - '0';
	106	} else if (*data == ',' && i < 5) {
	107	i++;
	108	} else {
	109	/* unexpected character */
	110	return -1;
	111	}
	112	}
	113
	114	if (i != 5)
	115	return -1;
	116
96d2ca4e AV	117	addr = get_unaligned((__be32 )p);
96d2ca4e AV	118	port = get_unaligned((__be16 )(p + 4));
1da177e4 LT	119	return 1;
	120	}
	121
	122
	123	/*
	124	* Look at outgoing ftp packets to catch the response to a PASV command
	125	* from the server (inside-to-outside).
	126	* When we see one, we build a connection entry with the client address,
	127	* client port 0 (unknown at the moment), the server address and the
	128	* server port. Mark the current connection entry as a control channel
	129	* of the new entry. All this work is just to make the data connection
	130	* can be scheduled to the right server later.
	131	*
	132	* The outgoing packet should be something like
	133	* "227 Entering Passive Mode (xxx,xxx,xxx,xxx,ppp,ppp)".
	134	* xxx,xxx,xxx,xxx is the server address, ppp,ppp is the server port number.
	135	*/
	136	static int ip_vs_ftp_out(struct ip_vs_app app, struct ip_vs_conn cp,
3db05fea	137	struct sk_buff skb, int diff)
1da177e4 LT	138	{
	139	struct iphdr *iph;
	140	struct tcphdr *th;
	141	char data, data_limit;
	142	char start, end;
014d730d AV	143	__be32 from;
014d730d AV	144	__be16 port;
1da177e4 LT	145	struct ip_vs_conn *n_cp;
	146	char buf[24]; /* xxx.xxx.xxx.xxx,ppp,ppp\000 */
	147	unsigned buf_len;
	148	int ret;
	149
	150	*diff = 0;
	151
	152	/* Only useful for established sessions */
	153	if (cp->state != IP_VS_TCP_S_ESTABLISHED)
	154	return 1;
	155
	156	/* Linear packets are much easier to deal with. */
3db05fea	157	if (!skb_make_writable(skb, skb->len))
1da177e4 LT	158	return 0;
	159
	160	if (cp->app_data == &ip_vs_ftp_pasv) {
3db05fea	161	iph = ip_hdr(skb);
1da177e4 LT	162	th = (struct tcphdr )&(((char )iph)[iph->ihl*4]);
1da177e4 LT	163	data = (char *)th + (th->doff << 2);
3db05fea	164	data_limit = skb_tail_pointer(skb);
1da177e4 LT	165
	166	if (ip_vs_ftp_get_addrport(data, data_limit,
	167	SERVER_STRING,
	168	sizeof(SERVER_STRING)-1, ')',
	169	&from, &port,
	170	&start, &end) != 1)
	171	return 1;
	172
b552216f	173	IP_VS_DBG(7, "PASV response (%u.%u.%u.%u:%d) -> "
1da177e4 LT	174	"%u.%u.%u.%u:%d detected\n",
	175	NIPQUAD(from), ntohs(port), NIPQUAD(cp->caddr), 0);
	176
	177	/*
	178	* Now update or create an connection entry for it
	179	*/
	180	n_cp = ip_vs_conn_out_get(iph->protocol, from, port,
	181	cp->caddr, 0);
	182	if (!n_cp) {
	183	n_cp = ip_vs_conn_new(IPPROTO_TCP,
	184	cp->caddr, 0,
	185	cp->vaddr, port,
	186	from, port,
	187	IP_VS_CONN_F_NO_CPORT,
	188	cp->dest);
	189	if (!n_cp)
	190	return 0;
	191
	192	/* add its controller */
	193	ip_vs_control_add(n_cp, cp);
	194	}
	195
	196	/*
	197	* Replace the old passive address with the new one
	198	*/
	199	from = n_cp->vaddr;
	200	port = n_cp->vport;
	201	sprintf(buf,"%d,%d,%d,%d,%d,%d", NIPQUAD(from),
bb831eb2	202	(ntohs(port)>>8)&255, ntohs(port)&255);
1da177e4 LT	203	buf_len = strlen(buf);
	204
	205	/*
	206	* Calculate required delta-offset to keep TCP happy
	207	*/
	208	*diff = buf_len - (end-start);
	209
	210	if (*diff == 0) {
	211	/* simply replace it with new passive address */
	212	memcpy(start, buf, buf_len);
	213	ret = 1;
	214	} else {
3db05fea	215	ret = !ip_vs_skb_replace(skb, GFP_ATOMIC, start,
1da177e4 LT	216	end-start, buf, buf_len);
	217	}
	218
	219	cp->app_data = NULL;
	220	ip_vs_tcp_conn_listen(n_cp);
	221	ip_vs_conn_put(n_cp);
	222	return ret;
	223	}
	224	return 1;
	225	}
	226
	227
	228	/*
	229	* Look at incoming ftp packets to catch the PASV/PORT command
	230	* (outside-to-inside).
	231	*
	232	* The incoming packet having the PORT command should be something like
	233	* "PORT xxx,xxx,xxx,xxx,ppp,ppp\n".
	234	* xxx,xxx,xxx,xxx is the client address, ppp,ppp is the client port number.
	235	* In this case, we create a connection entry using the client address and
	236	* port, so that the active ftp data connection from the server can reach
	237	* the client.
	238	*/
	239	static int ip_vs_ftp_in(struct ip_vs_app app, struct ip_vs_conn cp,
3db05fea	240	struct sk_buff skb, int diff)
1da177e4 LT	241	{
	242	struct iphdr *iph;
	243	struct tcphdr *th;
	244	char data, data_start, *data_limit;
	245	char start, end;
014d730d AV	246	__be32 to;
014d730d AV	247	__be16 port;
1da177e4 LT	248	struct ip_vs_conn *n_cp;
	249
	250	/* no diff required for incoming packets */
	251	*diff = 0;
	252
	253	/* Only useful for established sessions */
	254	if (cp->state != IP_VS_TCP_S_ESTABLISHED)
	255	return 1;
	256
	257	/* Linear packets are much easier to deal with. */
3db05fea	258	if (!skb_make_writable(skb, skb->len))
1da177e4 LT	259	return 0;
	260
	261	/*
	262	* Detecting whether it is passive
	263	*/
3db05fea	264	iph = ip_hdr(skb);
1da177e4 LT	265	th = (struct tcphdr )&(((char )iph)[iph->ihl*4]);
	266
	267	/* Since there may be OPTIONS in the TCP packet and the HLEN is
	268	the length of the header in 32-bit multiples, it is accurate
	269	to calculate data address by th+HLEN4 /
	270	data = data_start = (char *)th + (th->doff << 2);
3db05fea	271	data_limit = skb_tail_pointer(skb);
1da177e4 LT	272
	273	while (data <= data_limit - 6) {
	274	if (strnicmp(data, "PASV\r\n", 6) == 0) {
	275	/* Passive mode on */
5e7ddac7	276	IP_VS_DBG(7, "got PASV at %td of %td\n",
1da177e4 LT	277	data - data_start,
	278	data_limit - data_start);
	279	cp->app_data = &ip_vs_ftp_pasv;
	280	return 1;
	281	}
	282	data++;
	283	}
	284
	285	/*
	286	* To support virtual FTP server, the scenerio is as follows:
	287	* FTP client ----> Load Balancer ----> FTP server
	288	* First detect the port number in the application data,
	289	* then create a new connection entry for the coming data
	290	* connection.
	291	*/
	292	if (ip_vs_ftp_get_addrport(data_start, data_limit,
	293	CLIENT_STRING, sizeof(CLIENT_STRING)-1,
	294	'\r', &to, &port,
	295	&start, &end) != 1)
	296	return 1;
	297
b552216f	298	IP_VS_DBG(7, "PORT %u.%u.%u.%u:%d detected\n",
1da177e4 LT	299	NIPQUAD(to), ntohs(port));
	300
	301	/* Passive mode off */
	302	cp->app_data = NULL;
	303
	304	/*
	305	* Now update or create a connection entry for it
	306	*/
b552216f	307	IP_VS_DBG(7, "protocol %s %u.%u.%u.%u:%d %u.%u.%u.%u:%d\n",
1da177e4 LT	308	ip_vs_proto_name(iph->protocol),
	309	NIPQUAD(to), ntohs(port), NIPQUAD(cp->vaddr), 0);
	310
	311	n_cp = ip_vs_conn_in_get(iph->protocol,
	312	to, port,
	313	cp->vaddr, htons(ntohs(cp->vport)-1));
	314	if (!n_cp) {
	315	n_cp = ip_vs_conn_new(IPPROTO_TCP,
	316	to, port,
	317	cp->vaddr, htons(ntohs(cp->vport)-1),
	318	cp->daddr, htons(ntohs(cp->dport)-1),
	319	0,
	320	cp->dest);
	321	if (!n_cp)
	322	return 0;
	323
	324	/* add its controller */
	325	ip_vs_control_add(n_cp, cp);
	326	}
	327
	328	/*
	329	* Move tunnel to listen state
	330	*/
	331	ip_vs_tcp_conn_listen(n_cp);
	332	ip_vs_conn_put(n_cp);
	333
	334	return 1;
	335	}
	336
	337
	338	static struct ip_vs_app ip_vs_ftp = {
	339	.name = "ftp",
	340	.type = IP_VS_APP_TYPE_FTP,
	341	.protocol = IPPROTO_TCP,
	342	.module = THIS_MODULE,
	343	.incs_list = LIST_HEAD_INIT(ip_vs_ftp.incs_list),
	344	.init_conn = ip_vs_ftp_init_conn,
	345	.done_conn = ip_vs_ftp_done_conn,
	346	.bind_conn = NULL,
	347	.unbind_conn = NULL,
	348	.pkt_out = ip_vs_ftp_out,
	349	.pkt_in = ip_vs_ftp_in,
	350	};
	351
	352
	353	/*
	354	* ip_vs_ftp initialization
	355	*/
	356	static int __init ip_vs_ftp_init(void)
	357	{
	358	int i, ret;
	359	struct ip_vs_app *app = &ip_vs_ftp;
	360
	361	ret = register_ip_vs_app(app);
	362	if (ret)
	363	return ret;
	364
	365	for (i=0; i<IP_VS_APP_MAX_PORTS; i++) {
	366	if (!ports[i])
	367	continue;
	368	ret = register_ip_vs_app_inc(app, app->protocol, ports[i]);
	369	if (ret)
	370	break;
b552216f	371	IP_VS_INFO("%s: loaded support on port[%d] = %d\n",
e905a9ed	372	app->name, i, ports[i]);
1da177e4 LT	373	}
	374
	375	if (ret)
	376	unregister_ip_vs_app(app);
	377
	378	return ret;
	379	}
	380
	381
	382	/*
	383	* ip_vs_ftp finish.
	384	*/
	385	static void __exit ip_vs_ftp_exit(void)
	386	{
	387	unregister_ip_vs_app(&ip_vs_ftp);
	388	}
	389
	390
	391	module_init(ip_vs_ftp_init);
	392	module_exit(ip_vs_ftp_exit);
	393	MODULE_LICENSE("GPL");