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netfilter: nf_nat: support IPv6 in FTP NAT helper

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Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Patrick McHardy 2012-08-26 19:14:20 +02:00 committed by Pablo Neira Ayuso
parent ed72d9e294
commit d33cbeeb1a
6 changed files with 27 additions and 20 deletions
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5
net/ipv4/netfilter/Kconfig
View File

@ -221,11 +221,6 @@ config NF_NAT_PROTO_GRE
tristate
depends on NF_NAT_IPV4 && NF_CT_PROTO_GRE
config NF_NAT_FTP
tristate
depends on NF_CONNTRACK && NF_NAT_IPV4
default NF_NAT_IPV4 && NF_CONNTRACK_FTP
config NF_NAT_IRC
tristate
depends on NF_CONNTRACK && NF_NAT_IPV4

1
net/ipv4/netfilter/Makefile
View File

@ -21,7 +21,6 @@ obj-$(CONFIG_NF_DEFRAG_IPV4) += nf_defrag_ipv4.o
# NAT helpers (nf_conntrack)
obj-$(CONFIG_NF_NAT_AMANDA) += nf_nat_amanda.o
obj-$(CONFIG_NF_NAT_FTP) += nf_nat_ftp.o
obj-$(CONFIG_NF_NAT_H323) += nf_nat_h323.o
obj-$(CONFIG_NF_NAT_IRC) += nf_nat_irc.o
obj-$(CONFIG_NF_NAT_PPTP) += nf_nat_pptp.o

5
net/netfilter/Kconfig
View File

@ -380,6 +380,11 @@ config NF_NAT_PROTO_SCTP
depends on NF_NAT && NF_CT_PROTO_SCTP
select LIBCRC32C
config NF_NAT_FTP
tristate
depends on NF_CONNTRACK && NF_NAT
default NF_NAT && NF_CONNTRACK_FTP
endif # NF_CONNTRACK
# transparent proxy support

3
net/netfilter/Makefile
View File

@ -54,6 +54,9 @@ obj-$(CONFIG_NF_NAT_PROTO_DCCP) += nf_nat_proto_dccp.o
obj-$(CONFIG_NF_NAT_PROTO_UDPLITE) += nf_nat_proto_udplite.o
obj-$(CONFIG_NF_NAT_PROTO_SCTP) += nf_nat_proto_sctp.o
# NAT helpers
obj-$(CONFIG_NF_NAT_FTP) += nf_nat_ftp.o
# transparent proxy support
obj-$(CONFIG_NETFILTER_TPROXY) += nf_tproxy_core.o

3
net/netfilter/nf_conntrack_ftp.c
View File

@ -488,8 +488,7 @@ static int help(struct sk_buff *skb,
/* Now, NAT might want to mangle the packet, and register the
* (possibly changed) expectation itself. */
nf_nat_ftp = rcu_dereference(nf_nat_ftp_hook);
if (nf_nat_ftp && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
ct->status & IPS_NAT_MASK)
if (nf_nat_ftp && ct->status & IPS_NAT_MASK)
ret = nf_nat_ftp(skb, ctinfo, search[dir][i].ftptype,
protoff, matchoff, matchlen, exp);
else {

30
net/ipv4/netfilter/nf_nat_ftp.c → net/netfilter/nf_nat_ftp.c
View File

@ -10,7 +10,7 @@
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/ip.h>
#include <linux/inet.h>
#include <linux/tcp.h>
#include <linux/netfilter_ipv4.h>
#include <net/netfilter/nf_nat.h>
@ -26,22 +26,27 @@ MODULE_ALIAS("ip_nat_ftp");
/* FIXME: Time out? --RR */
static int nf_nat_ftp_fmt_cmd(enum nf_ct_ftp_type type,
static int nf_nat_ftp_fmt_cmd(struct nf_conn *ct, enum nf_ct_ftp_type type,
char *buffer, size_t buflen,
__be32 addr, u16 port)
union nf_inet_addr *addr, u16 port)
{
switch (type) {
case NF_CT_FTP_PORT:
case NF_CT_FTP_PASV:
return snprintf(buffer, buflen, "%u,%u,%u,%u,%u,%u",
((unsigned char *)&addr)[0],
((unsigned char *)&addr)[1],
((unsigned char *)&addr)[2],
((unsigned char *)&addr)[3],
((unsigned char *)&addr->ip)[0],
((unsigned char *)&addr->ip)[1],
((unsigned char *)&addr->ip)[2],
((unsigned char *)&addr->ip)[3],
port >> 8,
port & 0xFF);
case NF_CT_FTP_EPRT:
return snprintf(buffer, buflen, "|1|%pI4|%u|", &addr, port);
if (nf_ct_l3num(ct) == NFPROTO_IPV4)
return snprintf(buffer, buflen, "|1|%pI4|%u|",
&addr->ip, port);
else
return snprintf(buffer, buflen, "|2|%pI6|%u|",
&addr->ip6, port);
case NF_CT_FTP_EPSV:
return snprintf(buffer, buflen, "|||%u|", port);
}
@ -59,17 +64,17 @@ static unsigned int nf_nat_ftp(struct sk_buff *skb,
unsigned int matchlen,
struct nf_conntrack_expect *exp)
{
__be32 newip;
union nf_inet_addr newaddr;
u_int16_t port;
int dir = CTINFO2DIR(ctinfo);
struct nf_conn *ct = exp->master;
char buffer[sizeof("|1|255.255.255.255|65535|")];
char buffer[sizeof("|1||65535|") + INET6_ADDRSTRLEN];
unsigned int buflen;
pr_debug("FTP_NAT: type %i, off %u len %u\n", type, matchoff, matchlen);
/* Connection will come from wherever this packet goes, hence !dir */
newip = ct->tuplehash[!dir].tuple.dst.u3.ip;
newaddr = ct->tuplehash[!dir].tuple.dst.u3;
exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port;
exp->dir = !dir;
@ -94,7 +99,8 @@ static unsigned int nf_nat_ftp(struct sk_buff *skb,
if (port == 0)
return NF_DROP;
buflen = nf_nat_ftp_fmt_cmd(type, buffer, sizeof(buffer), newip, port);
buflen = nf_nat_ftp_fmt_cmd(ct, type, buffer, sizeof(buffer),
&newaddr, port);
if (!buflen)
goto out;