Release 4.8 net/netfilter/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
*
*/
#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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| wensong zhang | wensong zhang | 19 | 73.08% | 1 | 50.00% |
| julian anastasov | julian anastasov | 7 | 26.92% | 1 | 50.00% |
| Total | 26 | 100.00% | 2 | 100.00% |
static int
ip_vs_ftp_done_conn(struct ip_vs_app *app, struct ip_vs_conn *cp)
{
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| wensong zhang | wensong zhang | 19 | 100.00% | 1 | 100.00% |
| Total | 19 | 100.00% | 1 | 100.00% |
/*
* 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 (strncasecmp(data, pattern, data_limit - data) == 0)
return -1;
else
return 0;
}
if (strncasecmp(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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| julian anastasov | julian anastasov | 178 | 50.86% | 2 | 33.33% |
| wensong zhang | wensong zhang | 86 | 24.57% | 1 | 16.67% |
| hannes eder | hannes eder | 82 | 23.43% | 1 | 16.67% |
| rasmus villemoes | rasmus villemoes | 2 | 0.57% | 1 | 16.67% |
| al viro | al viro | 2 | 0.57% | 1 | 16.67% |
| Total | 350 | 100.00% | 6 | 100.00% |
/*
* 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;
*diff = 0;
#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
/* 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(cp->ipvs, 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(cp->ipvs,
AF_INET, IPPROTO_TCP, &cp->caddr,
0, &cp->vaddr, port, &p);
/* As above, this is ipv4 only */
n_cp = ip_vs_conn_new(&p, AF_INET, &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) & 0xFF);
buf_len = strlen(buf);
ct = nf_ct_get(skb, &ctinfo);
if (ct && !nf_ct_is_untracked(ct) && nfct_nat(ct)) {
/* If mangling fails this function will return 0
* which will cause the packet to be dropped.
* Mangling can only fail under memory pressure,
* hopefully it will succeed on the retransmitted
* packet.
*/
rcu_read_lock();
ret = nf_nat_mangle_tcp_packet(skb, ct, ctinfo,
iph->ihl * 4,
start-data, end-start,
buf, buf_len);
rcu_read_unlock();
if (ret) {
ip_vs_nfct_expect_related(skb, ct, n_cp,
IPPROTO_TCP, 0, 0);
if (skb->ip_summed == CHECKSUM_COMPLETE)
skb->ip_summed = CHECKSUM_UNNECESSARY;
/* csum is updated */
ret = 1;
}
}
/*
* Not setting 'diff' is intentional, otherwise the sequence
* would be adjusted twice.
*/
cp->app_data = NULL;
ip_vs_tcp_conn_listen(n_cp);
ip_vs_conn_put(n_cp);
return ret;
}
return 1;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| wensong zhang | wensong zhang | 327 | 51.82% | 1 | 3.45% |
| julian anastasov | julian anastasov | 66 | 10.46% | 7 | 24.14% |
| joe perches | joe perches | 63 | 9.98% | 2 | 6.90% |
| hannes eder | hannes eder | 50 | 7.92% | 1 | 3.45% |
| julius volz | julius volz | 40 | 6.34% | 3 | 10.34% |
| simon horman | simon horman | 35 | 5.55% | 2 | 6.90% |
| hans schillstrom | hans schillstrom | 8 | 1.27% | 2 | 6.90% |
| al viro | al viro | 7 | 1.11% | 1 | 3.45% |
| herbert xu | herbert xu | 7 | 1.11% | 2 | 6.90% |
| patrick mchardy | patrick mchardy | 6 | 0.95% | 1 | 3.45% |
| arnaldo carvalho de melo | arnaldo carvalho de melo | 6 | 0.95% | 2 | 6.90% |
| dan carpenter | dan carpenter | 5 | 0.79% | 1 | 3.45% |
| eric w. biederman | eric w. biederman | 4 | 0.63% | 1 | 3.45% |
| alex gartrell | alex gartrell | 3 | 0.48% | 1 | 3.45% |
| harvey harrison | harvey harrison | 3 | 0.48% | 1 | 3.45% |
| eric dumazet | eric dumazet | 1 | 0.16% | 1 | 3.45% |
| Total | 631 | 100.00% | 29 | 100.00% |
/*
* 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;
/* no diff required for incoming packets */
*diff = 0;
#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
/* 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 (strncasecmp(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 %pI4:%d detected\n", &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 %pI4:%d %pI4:%d\n",
ip_vs_proto_name(iph->protocol),
&to.ip, ntohs(port), &cp->vaddr.ip, 0);
{
struct ip_vs_conn_param p;
ip_vs_conn_fill_param(cp->ipvs, AF_INET,
iph->protocol, &to, port, &cp->vaddr,
htons(ntohs(cp->vport)-1), &p);
n_cp = ip_vs_conn_in_get(&p);
if (!n_cp) {
/* This is ipv4 only */
n_cp = ip_vs_conn_new(&p, AF_INET, &cp->daddr,
htons(ntohs(cp->dport)-1),
IP_VS_CONN_F_NFCT, cp->dest,
skb->mark);
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| wensong zhang | wensong zhang | 322 | 70.77% | 1 | 4.55% |
| julian anastasov | julian anastasov | 41 | 9.01% | 3 | 13.64% |
| julius volz | julius volz | 33 | 7.25% | 3 | 13.64% |
| simon horman | simon horman | 22 | 4.84% | 2 | 9.09% |
| dan carpenter | dan carpenter | 6 | 1.32% | 1 | 4.55% |
| herbert xu | herbert xu | 6 | 1.32% | 2 | 9.09% |
| arnaldo carvalho de melo | arnaldo carvalho de melo | 6 | 1.32% | 2 | 9.09% |
| hans schillstrom | hans schillstrom | 6 | 1.32% | 2 | 9.09% |
| harvey harrison | harvey harrison | 5 | 1.10% | 1 | 4.55% |
| alex gartrell | alex gartrell | 3 | 0.66% | 1 | 4.55% |
| eric w. biederman | eric w. biederman | 2 | 0.44% | 1 | 4.55% |
| al viro | al viro | 2 | 0.44% | 2 | 9.09% |
| rasmus villemoes | rasmus villemoes | 1 | 0.22% | 1 | 4.55% |
| Total | 455 | 100.00% | 22 | 100.00% |
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,
};
/*
* per netns ip_vs_ftp initialization
*/
static int __net_init __ip_vs_ftp_init(struct net *net)
{
int i, ret;
struct ip_vs_app *app;
struct netns_ipvs *ipvs = net_ipvs(net);
if (!ipvs)
return -ENOENT;
app = register_ip_vs_app(ipvs, &ip_vs_ftp);
if (IS_ERR(app))
return PTR_ERR(app);
for (i = 0; i < ports_count; i++) {
if (!ports[i])
continue;
ret = register_ip_vs_app_inc(ipvs, app, app->protocol, ports[i]);
if (ret)
goto err_unreg;
pr_info("%s: loaded support on port[%d] = %d\n",
app->name, i, ports[i]);
}
return 0;
err_unreg:
unregister_ip_vs_app(ipvs, &ip_vs_ftp);
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| wensong zhang | wensong zhang | 84 | 57.93% | 1 | 10.00% |
| hans schillstrom | hans schillstrom | 38 | 26.21% | 3 | 30.00% |
| julian anastasov | julian anastasov | 18 | 12.41% | 2 | 20.00% |
| eric w. biederman | eric w. biederman | 3 | 2.07% | 2 | 20.00% |
| hannes eder | hannes eder | 1 | 0.69% | 1 | 10.00% |
| krzysztof wilczynski | krzysztof wilczynski | 1 | 0.69% | 1 | 10.00% |
| Total | 145 | 100.00% | 10 | 100.00% |
/*
* netns exit
*/
static void __ip_vs_ftp_exit(struct net *net)
{
struct netns_ipvs *ipvs = net_ipvs(net);
if (!ipvs)
return;
unregister_ip_vs_app(ipvs, &ip_vs_ftp);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| eric w. biederman | eric w. biederman | 17 | 48.57% | 1 | 25.00% |
| hans schillstrom | hans schillstrom | 16 | 45.71% | 2 | 50.00% |
| julian anastasov | julian anastasov | 2 | 5.71% | 1 | 25.00% |
| Total | 35 | 100.00% | 4 | 100.00% |
static struct pernet_operations ip_vs_ftp_ops = {
.init = __ip_vs_ftp_init,
.exit = __ip_vs_ftp_exit,
};
static int __init ip_vs_ftp_init(void)
{
int rv;
rv = register_pernet_subsys(&ip_vs_ftp_ops);
/* rcu_barrier() is called by netns on error */
return rv;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| hans schillstrom | hans schillstrom | 22 | 91.67% | 1 | 33.33% |
| h hartley sweeten | h hartley sweeten | 1 | 4.17% | 1 | 33.33% |
| julian anastasov | julian anastasov | 1 | 4.17% | 1 | 33.33% |
| Total | 24 | 100.00% | 3 | 100.00% |
/*
* ip_vs_ftp finish.
*/
static void __exit ip_vs_ftp_exit(void)
{
unregister_pernet_subsys(&ip_vs_ftp_ops);
/* rcu_barrier() is called by netns */
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| wensong zhang | wensong zhang | 13 | 81.25% | 1 | 33.33% |
| hans schillstrom | hans schillstrom | 2 | 12.50% | 1 | 33.33% |
| julian anastasov | julian anastasov | 1 | 6.25% | 1 | 33.33% |
| Total | 16 | 100.00% | 3 | 100.00% |
module_init(ip_vs_ftp_init);
module_exit(ip_vs_ftp_exit);
MODULE_LICENSE("GPL");
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| wensong zhang | wensong zhang | 1003 | 52.24% | 1 | 2.08% |
| julian anastasov | julian anastasov | 321 | 16.72% | 10 | 20.83% |
| hannes eder | hannes eder | 153 | 7.97% | 3 | 6.25% |
| hans schillstrom | hans schillstrom | 111 | 5.78% | 5 | 10.42% |
| julius volz | julius volz | 73 | 3.80% | 3 | 6.25% |
| simon horman | simon horman | 67 | 3.49% | 4 | 8.33% |
| joe perches | joe perches | 63 | 3.28% | 2 | 4.17% |
| eric w. biederman | eric w. biederman | 26 | 1.35% | 3 | 6.25% |
| herbert xu | herbert xu | 16 | 0.83% | 2 | 4.17% |
| al viro | al viro | 14 | 0.73% | 3 | 6.25% |
| arnaldo carvalho de melo | arnaldo carvalho de melo | 12 | 0.62% | 2 | 4.17% |
| stephen hemminger | stephen hemminger | 11 | 0.57% | 1 | 2.08% |
| dan carpenter | dan carpenter | 11 | 0.57% | 1 | 2.08% |
| krzysztof wilczynski | krzysztof wilczynski | 11 | 0.57% | 1 | 2.08% |
| harvey harrison | harvey harrison | 8 | 0.42% | 1 | 2.08% |
| alex gartrell | alex gartrell | 6 | 0.31% | 1 | 2.08% |
| patrick mchardy | patrick mchardy | 6 | 0.31% | 1 | 2.08% |
| rasmus villemoes | rasmus villemoes | 3 | 0.16% | 1 | 2.08% |
| tejun heo | tejun heo | 3 | 0.16% | 1 | 2.08% |
| h hartley sweeten | h hartley sweeten | 1 | 0.05% | 1 | 2.08% |
| eric dumazet | eric dumazet | 1 | 0.05% | 1 | 2.08% |
| Total | 1920 | 100.00% | 48 | 100.00% |
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