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[NETFILTER]: nf_conntrack/nf_nat: add amanda helper port

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Add IPv4 and IPv6 capable nf_conntrack port of the Amanda conntrack/NAT helper.

Signed-off-by: Patrick McHardy <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Patrick McHardy 2006-12-02 22:08:26 -08:00 • committed by David S. Miller
commit 1695890057
7 changed files with 347 additions and 0 deletions
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5
net/ipv4/netfilter/Kconfig
View file

@ -512,6 +512,11 @@ config IP_NF_NAT_AMANDA
default IP_NF_NAT if IP_NF_AMANDA=y
default m if IP_NF_AMANDA=m
config NF_NAT_AMANDA
tristate
depends on IP_NF_IPTABLES && NF_CONNTRACK && NF_NAT
default NF_NAT && NF_CONNTRACK_AMANDA
config IP_NF_NAT_PPTP
tristate
depends on IP_NF_NAT!=n && IP_NF_PPTP!=n

1
net/ipv4/netfilter/Makefile
View file

@ -50,6 +50,7 @@ obj-$(CONFIG_IP_NF_NAT_IRC) += ip_nat_irc.o
obj-$(CONFIG_IP_NF_NAT_SIP) += ip_nat_sip.o
# NAT helpers (nf_conntrack)
obj-$(CONFIG_NF_NAT_AMANDA) += nf_nat_amanda.o
obj-$(CONFIG_NF_NAT_FTP) += nf_nat_ftp.o
# generic IP tables

78
net/ipv4/netfilter/nf_nat_amanda.c Normal file
View file

@ -0,0 +1,78 @@
/* Amanda extension for TCP NAT alteration.
* (C) 2002 by Brian J. Murrell <netfilter@interlinx.bc.ca>
* based on a copy of HW's ip_nat_irc.c as well as other modules
*
* 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.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/udp.h>
#include <net/netfilter/nf_nat_helper.h>
#include <net/netfilter/nf_nat_rule.h>
#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/nf_conntrack_expect.h>
#include <linux/netfilter/nf_conntrack_amanda.h>
MODULE_AUTHOR("Brian J. Murrell <[email protected]>");
MODULE_DESCRIPTION("Amanda NAT helper");
MODULE_LICENSE("GPL");
MODULE_ALIAS("ip_nat_amanda");
static unsigned int help(struct sk_buff **pskb,
enum ip_conntrack_info ctinfo,
unsigned int matchoff,
unsigned int matchlen,
struct nf_conntrack_expect *exp)
{
char buffer[sizeof("65535")];
u_int16_t port;
unsigned int ret;
/* Connection comes from client. */
exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port;
exp->dir = IP_CT_DIR_ORIGINAL;
/* When you see the packet, we need to NAT it the same as the
* this one (ie. same IP: it will be TCP and master is UDP). */
exp->expectfn = nf_nat_follow_master;
/* Try to get same port: if not, try to change it. */
for (port = ntohs(exp->saved_proto.tcp.port); port != 0; port++) {
exp->tuple.dst.u.tcp.port = htons(port);
if (nf_conntrack_expect_related(exp) == 0)
break;
}
if (port == 0)
return NF_DROP;
sprintf(buffer, "%u", port);
ret = nf_nat_mangle_udp_packet(pskb, exp->master, ctinfo,
matchoff, matchlen,
buffer, strlen(buffer));
if (ret != NF_ACCEPT)
nf_conntrack_unexpect_related(exp);
return ret;
}
static void __exit nf_nat_amanda_fini(void)
{
rcu_assign_pointer(nf_nat_amanda_hook, NULL);
synchronize_rcu();
}
static int __init nf_nat_amanda_init(void)
{
BUG_ON(rcu_dereference(nf_nat_amanda_hook));
rcu_assign_pointer(nf_nat_amanda_hook, help);
return 0;
}
module_init(nf_nat_amanda_init);
module_exit(nf_nat_amanda_fini);