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DEFINITIONS
This source file includes following definitions.
- ip_vs_ftp_init_conn
- ip_vs_ftp_done_conn
- ip_vs_ftp_get_addrport
- ip_vs_ftp_out
- ip_vs_ftp_in
- ip_vs_ftp_init
- ip_vs_ftp_exit
/*
* 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;
union nf_inet_addr from;
__be16 port;
struct ip_vs_conn *n_cp;
char buf[24]; /* xxx.xxx.xxx.xxx,ppp,ppp\000 */
unsigned buf_len;
int ret;
#ifdef CONFIG_IP_VS_IPV6
/* This application helper doesn't work with IPv6 yet,
* so turn this into a no-op for IPv6 packets
*/
if (cp->af == AF_INET6)
return 1;
#endif
*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.ip, &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.ip), ntohs(port),
NIPQUAD(cp->caddr.ip), 0);
/*
* Now update or create an connection entry for it
*/
n_cp = ip_vs_conn_out_get(AF_INET, iph->protocol, &from, port,
&cp->caddr, 0);
if (!n_cp) {
n_cp = ip_vs_conn_new(AF_INET, 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.ip = n_cp->vaddr.ip;
port = n_cp->vport;
sprintf(buf, "%d,%d,%d,%d,%d,%d", NIPQUAD(from.ip),
(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;
union nf_inet_addr to;
__be16 port;
struct ip_vs_conn *n_cp;
#ifdef CONFIG_IP_VS_IPV6
/* This application helper doesn't work with IPv6 yet,
* so turn this into a no-op for IPv6 packets
*/
if (cp->af == AF_INET6)
return 1;
#endif
/* 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.ip, &port,
&start, &end) != 1)
return 1;
IP_VS_DBG(7, "PORT %u.%u.%u.%u:%d detected\n",
NIPQUAD(to.ip), 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.ip), ntohs(port), NIPQUAD(cp->vaddr.ip), 0);
n_cp = ip_vs_conn_in_get(AF_INET, iph->protocol,
&to, port,
&cp->vaddr, htons(ntohs(cp->vport)-1));
if (!n_cp) {
n_cp = ip_vs_conn_new(AF_INET, 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");