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/*
* 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
*
*/
#define KMSG_COMPONENT "IPVS"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#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/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_expect.h>
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nf_nat_helper.h>
#include <linux/gfp.h>
#include <net/protocol.h>
#include <net/tcp.h>
#include <asm/unaligned.h>
#include <net/ip_vs.h>
#define SERVER_STRING "227 "
#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 int ports_count = 1;
static unsigned short ports[IP_VS_APP_MAX_PORTS] = {21, 0};
module_param_array(ports, ushort, &ports_count, 0444);
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)
{
/* We use connection tracking for the command connection */
cp->flags |= IP_VS_CONN_F_NFCT;
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", ignoring before "skip" 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 skip, char term,
__be32 *addr, __be16 *port,
char **start, char **end)
{
char *s, c;
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;
}
s = data + plen;
if (skip) {
int found = 0;
for (;; s++) {
if (s == data_limit)
return -1;
if (!found) {
if (*s == skip)
found = 1;
} else if (*s != skip) {
break;
}
}
}
for (data = s; ; data++) {
if (data == data_limit)
return -1;
if (*data == term)
break;
}
*end = data;
memset(p, 0, sizeof(p));
for (data = s; ; data++) {
c = *data;
if (c == term)
break;
if (c >= '0' && c <= '9') {
p[i] = p[i]*10 + c - '0';
} else if (c == ',' && i < 5) {
i++;
} else {
/* unexpected character */
return -1;
}
}
if (i != 5)
return -1;
*start = s;
*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 int buf_len;
int ret = 0;
enum ip_conntrack_info ctinfo;
struct nf_conn *ct;
struct net *net;
#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 (%pI4:%d) -> %pI4:%d detected\n",
&from.ip, ntohs(port), &cp->caddr.ip, 0);
/*
* Now update or create an connection entry for it
*/
{
struct ip_vs_conn_param p;
ip_vs_conn_fill_param(ip_vs_conn_net(cp), AF_INET,
iph->protocol, &from, port,
&cp->caddr, 0, &p);
n_cp = ip_vs_conn_out_get(&p);
}
if (!n_cp) {
struct ip_vs_conn_param p;
ip_vs_conn_fill_param(ip_vs_conn_net(cp),
AF_INET, IPPROTO_TCP, &cp->caddr,
0, &cp->vaddr, port, &p);
n_cp = ip_vs_conn_new(&p, &from, port,
IP_VS_CONN_F_NO_CPORT |
IP_VS_CONN_F_NFCT,
cp->dest, skb->mark);
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;
snprintf(buf, sizeof(buf), "%u,%u,%u,%u,%u,%u",
((unsigned char *)&from.ip)[0],
((unsigned char *)&from.ip)[1],
((unsigned char *)&from.ip)[2],
((unsigned char *)&from.ip)[3],
ntohs(port) >> 8,
ntohs(port) &
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