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

/*
 * ip_vs_ftp.c: IPVS ftp application module
 *
 * Version:	$Id: ip_vs_ftp.c,v 1.13 2002/09/15 08:14:08 wensong Exp $
 *
 * Authors:	Wensong Zhang <[email protected]>
 *
 * 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 <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 **pskb, 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 (!ip_vs_make_skb_writable(pskb, (*pskb)->len))
		return 0;

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

		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)&255, (ntohs(port)>>8)&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(*pskb, 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 **pskb, 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 (!ip_vs_make_skb_writable(pskb, (*pskb)->len))
		return 0;

	/*
	 * Detecting whether it is passive
	 */
	iph = (*pskb)->nh.iph;
	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 = (*pskb)->tail;

	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	*
	4	* Version: $Id: ip_vs_ftp.c,v 1.13 2002/09/15 08:14:08 wensong Exp $
	5	*
	6	* Authors: Wensong Zhang <[email protected]>
	7	*
	8	* Changes:
	9	*
	10	*
	11	* This program is free software; you can redistribute it and/or
	12	* modify it under the terms of the GNU General Public License
	13	* as published by the Free Software Foundation; either version
	14	* 2 of the License, or (at your option) any later version.
	15	*
	16	* Most code here is taken from ip_masq_ftp.c in kernel 2.2. The difference
	17	* is that ip_vs_ftp module handles the reverse direction to ip_masq_ftp.
	18	*
	19	* IP_MASQ_FTP ftp masquerading module
	20	*
	21	* Version: @(#)ip_masq_ftp.c 0.04 02/05/96
	22	*
	23	* Author: Wouter Gadeyne
	24	*
	25	*/
	26
	27	#include <linux/module.h>
	28	#include <linux/moduleparam.h>
	29	#include <linux/kernel.h>
	30	#include <linux/skbuff.h>
	31	#include <linux/in.h>
	32	#include <linux/ip.h>
	33	#include <net/protocol.h>
	34	#include <net/tcp.h>
96d2ca4e	35	#include <asm/unaligned.h>
1da177e4 LT	36
	37	#include <net/ip_vs.h>
	38
	39
	40	#define SERVER_STRING "227 Entering Passive Mode ("
	41	#define CLIENT_STRING "PORT "
	42
	43
	44	/*
	45	* List of ports (up to IP_VS_APP_MAX_PORTS) to be handled by helper
	46	* First port is set to the default port.
	47	*/
28b06c38 SH	48	static unsigned short ports[IP_VS_APP_MAX_PORTS] = {21, 0};
28b06c38 SH	49	module_param_array(ports, ushort, NULL, 0);
70e76b76	50	MODULE_PARM_DESC(ports, "Ports to monitor for FTP control commands");
1da177e4	51
1da177e4 LT	52
	53	/* Dummy variable */
	54	static int ip_vs_ftp_pasv;
	55
	56
	57	static int
	58	ip_vs_ftp_init_conn(struct ip_vs_app app, struct ip_vs_conn cp)
	59	{
	60	return 0;
	61	}
	62
	63
	64	static int
	65	ip_vs_ftp_done_conn(struct ip_vs_app app, struct ip_vs_conn cp)
	66	{
	67	return 0;
	68	}
	69
	70
	71	/*
	72	* Get <addr,port> from the string "xxx.xxx.xxx.xxx,ppp,ppp", started
	73	* with the "pattern" and terminated with the "term" character.
	74	* <addr,port> is in network order.
	75	*/
	76	static int ip_vs_ftp_get_addrport(char data, char data_limit,
	77	const char *pattern, size_t plen, char term,
014d730d	78	__be32 addr, __be16 port,
1da177e4 LT	79	char start, char end)
	80	{
	81	unsigned char p[6];
	82	int i = 0;
	83
	84	if (data_limit - data < plen) {
	85	/* check if there is partial match */
	86	if (strnicmp(data, pattern, data_limit - data) == 0)
	87	return -1;
	88	else
	89	return 0;
	90	}
	91
	92	if (strnicmp(data, pattern, plen) != 0) {
	93	return 0;
	94	}
	95	*start = data + plen;
	96
	97	for (data = start; data != term; data++) {
	98	if (data == data_limit)
	99	return -1;
	100	}
	101	*end = data;
	102
	103	memset(p, 0, sizeof(p));
	104	for (data = start; data != end; data++) {
	105	if (data >= '0' && data <= '9') {
	106	p[i] = p[i]10 + data - '0';
	107	} else if (*data == ',' && i < 5) {
	108	i++;
	109	} else {
	110	/* unexpected character */
	111	return -1;
	112	}
	113	}
	114
	115	if (i != 5)
	116	return -1;
	117
96d2ca4e AV	118	addr = get_unaligned((__be32 )p);
96d2ca4e AV	119	port = get_unaligned((__be16 )(p + 4));
1da177e4 LT	120	return 1;
	121	}
	122
	123
	124	/*
	125	* Look at outgoing ftp packets to catch the response to a PASV command
	126	* from the server (inside-to-outside).
	127	* When we see one, we build a connection entry with the client address,
	128	* client port 0 (unknown at the moment), the server address and the
	129	* server port. Mark the current connection entry as a control channel
	130	* of the new entry. All this work is just to make the data connection
	131	* can be scheduled to the right server later.
	132	*
	133	* The outgoing packet should be something like
	134	* "227 Entering Passive Mode (xxx,xxx,xxx,xxx,ppp,ppp)".
	135	* xxx,xxx,xxx,xxx is the server address, ppp,ppp is the server port number.
	136	*/
	137	static int ip_vs_ftp_out(struct ip_vs_app app, struct ip_vs_conn cp,
	138	struct sk_buff *pskb, int diff)
	139	{
	140	struct iphdr *iph;
	141	struct tcphdr *th;
	142	char data, data_limit;
	143	char start, end;
014d730d AV	144	__be32 from;
014d730d AV	145	__be16 port;
1da177e4 LT	146	struct ip_vs_conn *n_cp;
	147	char buf[24]; /* xxx.xxx.xxx.xxx,ppp,ppp\000 */
	148	unsigned buf_len;
	149	int ret;
	150
	151	*diff = 0;
	152
	153	/* Only useful for established sessions */
	154	if (cp->state != IP_VS_TCP_S_ESTABLISHED)
	155	return 1;
	156
	157	/* Linear packets are much easier to deal with. */
	158	if (!ip_vs_make_skb_writable(pskb, (*pskb)->len))
	159	return 0;
	160
	161	if (cp->app_data == &ip_vs_ftp_pasv) {
	162	iph = (*pskb)->nh.iph;
	163	th = (struct tcphdr )&(((char )iph)[iph->ihl*4]);
	164	data = (char *)th + (th->doff << 2);
	165	data_limit = (*pskb)->tail;
	166
	167	if (ip_vs_ftp_get_addrport(data, data_limit,
	168	SERVER_STRING,
	169	sizeof(SERVER_STRING)-1, ')',
	170	&from, &port,
	171	&start, &end) != 1)
	172	return 1;
	173
b552216f	174	IP_VS_DBG(7, "PASV response (%u.%u.%u.%u:%d) -> "
1da177e4 LT	175	"%u.%u.%u.%u:%d detected\n",
	176	NIPQUAD(from), ntohs(port), NIPQUAD(cp->caddr), 0);
	177
	178	/*
	179	* Now update or create an connection entry for it
	180	*/
	181	n_cp = ip_vs_conn_out_get(iph->protocol, from, port,
	182	cp->caddr, 0);
	183	if (!n_cp) {
	184	n_cp = ip_vs_conn_new(IPPROTO_TCP,
	185	cp->caddr, 0,
	186	cp->vaddr, port,
	187	from, port,
	188	IP_VS_CONN_F_NO_CPORT,
	189	cp->dest);
	190	if (!n_cp)
	191	return 0;
	192
	193	/* add its controller */
	194	ip_vs_control_add(n_cp, cp);
	195	}
	196
	197	/*
	198	* Replace the old passive address with the new one
	199	*/
	200	from = n_cp->vaddr;
	201	port = n_cp->vport;
	202	sprintf(buf,"%d,%d,%d,%d,%d,%d", NIPQUAD(from),
014d730d	203	ntohs(port)&255, (ntohs(port)>>8)&255);
1da177e4 LT	204	buf_len = strlen(buf);
	205
	206	/*
	207	* Calculate required delta-offset to keep TCP happy
	208	*/
	209	*diff = buf_len - (end-start);
	210
	211	if (*diff == 0) {
	212	/* simply replace it with new passive address */
	213	memcpy(start, buf, buf_len);
	214	ret = 1;
	215	} else {
	216	ret = !ip_vs_skb_replace(*pskb, GFP_ATOMIC, start,
	217	end-start, buf, buf_len);
	218	}
	219
	220	cp->app_data = NULL;
	221	ip_vs_tcp_conn_listen(n_cp);
	222	ip_vs_conn_put(n_cp);
	223	return ret;
	224	}
	225	return 1;
	226	}
	227
	228
	229	/*
	230	* Look at incoming ftp packets to catch the PASV/PORT command
	231	* (outside-to-inside).
	232	*
	233	* The incoming packet having the PORT command should be something like
	234	* "PORT xxx,xxx,xxx,xxx,ppp,ppp\n".
	235	* xxx,xxx,xxx,xxx is the client address, ppp,ppp is the client port number.
	236	* In this case, we create a connection entry using the client address and
	237	* port, so that the active ftp data connection from the server can reach
	238	* the client.
	239	*/
	240	static int ip_vs_ftp_in(struct ip_vs_app app, struct ip_vs_conn cp,
	241	struct sk_buff *pskb, int diff)
	242	{
	243	struct iphdr *iph;
	244	struct tcphdr *th;
	245	char data, data_start, *data_limit;
	246	char start, end;
014d730d AV	247	__be32 to;
014d730d AV	248	__be16 port;
1da177e4 LT	249	struct ip_vs_conn *n_cp;
	250
	251	/* no diff required for incoming packets */
	252	*diff = 0;
	253
	254	/* Only useful for established sessions */
	255	if (cp->state != IP_VS_TCP_S_ESTABLISHED)
	256	return 1;
	257
	258	/* Linear packets are much easier to deal with. */
	259	if (!ip_vs_make_skb_writable(pskb, (*pskb)->len))
	260	return 0;
	261
	262	/*
	263	* Detecting whether it is passive
	264	*/
	265	iph = (*pskb)->nh.iph;
	266	th = (struct tcphdr )&(((char )iph)[iph->ihl*4]);
	267
	268	/* Since there may be OPTIONS in the TCP packet and the HLEN is
	269	the length of the header in 32-bit multiples, it is accurate
	270	to calculate data address by th+HLEN4 /
	271	data = data_start = (char *)th + (th->doff << 2);
	272	data_limit = (*pskb)->tail;
	273
	274	while (data <= data_limit - 6) {
	275	if (strnicmp(data, "PASV\r\n", 6) == 0) {
	276	/* Passive mode on */
5e7ddac7	277	IP_VS_DBG(7, "got PASV at %td of %td\n",
1da177e4 LT	278	data - data_start,
	279	data_limit - data_start);
	280	cp->app_data = &ip_vs_ftp_pasv;
	281	return 1;
	282	}
	283	data++;
	284	}
	285
	286	/*
	287	* To support virtual FTP server, the scenerio is as follows:
	288	* FTP client ----> Load Balancer ----> FTP server
	289	* First detect the port number in the application data,
	290	* then create a new connection entry for the coming data
	291	* connection.
	292	*/
	293	if (ip_vs_ftp_get_addrport(data_start, data_limit,
	294	CLIENT_STRING, sizeof(CLIENT_STRING)-1,
	295	'\r', &to, &port,
	296	&start, &end) != 1)
	297	return 1;
	298
b552216f	299	IP_VS_DBG(7, "PORT %u.%u.%u.%u:%d detected\n",
1da177e4 LT	300	NIPQUAD(to), ntohs(port));
	301
	302	/* Passive mode off */
	303	cp->app_data = NULL;
	304
	305	/*
	306	* Now update or create a connection entry for it
	307	*/
b552216f	308	IP_VS_DBG(7, "protocol %s %u.%u.%u.%u:%d %u.%u.%u.%u:%d\n",
1da177e4 LT	309	ip_vs_proto_name(iph->protocol),
	310	NIPQUAD(to), ntohs(port), NIPQUAD(cp->vaddr), 0);
	311
	312	n_cp = ip_vs_conn_in_get(iph->protocol,
	313	to, port,
	314	cp->vaddr, htons(ntohs(cp->vport)-1));
	315	if (!n_cp) {
	316	n_cp = ip_vs_conn_new(IPPROTO_TCP,
	317	to, port,
	318	cp->vaddr, htons(ntohs(cp->vport)-1),
	319	cp->daddr, htons(ntohs(cp->dport)-1),
	320	0,
	321	cp->dest);
	322	if (!n_cp)
	323	return 0;
	324
	325	/* add its controller */
	326	ip_vs_control_add(n_cp, cp);
	327	}
	328
	329	/*
	330	* Move tunnel to listen state
	331	*/
	332	ip_vs_tcp_conn_listen(n_cp);
	333	ip_vs_conn_put(n_cp);
	334
	335	return 1;
	336	}
	337
	338
	339	static struct ip_vs_app ip_vs_ftp = {
	340	.name = "ftp",
	341	.type = IP_VS_APP_TYPE_FTP,
	342	.protocol = IPPROTO_TCP,
	343	.module = THIS_MODULE,
	344	.incs_list = LIST_HEAD_INIT(ip_vs_ftp.incs_list),
	345	.init_conn = ip_vs_ftp_init_conn,
	346	.done_conn = ip_vs_ftp_done_conn,
	347	.bind_conn = NULL,
	348	.unbind_conn = NULL,
	349	.pkt_out = ip_vs_ftp_out,
	350	.pkt_in = ip_vs_ftp_in,
	351	};
	352
	353
	354	/*
	355	* ip_vs_ftp initialization
	356	*/
	357	static int __init ip_vs_ftp_init(void)
	358	{
	359	int i, ret;
	360	struct ip_vs_app *app = &ip_vs_ftp;
	361
	362	ret = register_ip_vs_app(app);
	363	if (ret)
	364	return ret;
	365
	366	for (i=0; i<IP_VS_APP_MAX_PORTS; i++) {
	367	if (!ports[i])
	368	continue;
	369	ret = register_ip_vs_app_inc(app, app->protocol, ports[i]);
	370	if (ret)
	371	break;
b552216f SH	372	IP_VS_INFO("%s: loaded support on port[%d] = %d\n",
b552216f SH	373	app->name, i, ports[i]);
1da177e4 LT	374	}
	375
	376	if (ret)
	377	unregister_ip_vs_app(app);
	378
	379	return ret;
	380	}
	381
	382
	383	/*
	384	* ip_vs_ftp finish.
	385	*/
	386	static void __exit ip_vs_ftp_exit(void)
	387	{
	388	unregister_ip_vs_app(&ip_vs_ftp);
	389	}
	390
	391
	392	module_init(ip_vs_ftp_init);
	393	module_exit(ip_vs_ftp_exit);
	394	MODULE_LICENSE("GPL");