netfilter: nf_nat: support IPv6 in IRC NAT helper
Signed-off-by: Pablo Neira Ayuso <[email protected]>
Signed-off-by: Patrick McHardy <[email protected]>
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index bf3e464..cabe4da 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -390,6 +390,11 @@
depends on NF_CONNTRACK && NF_NAT
default NF_NAT && NF_CONNTRACK_FTP
+config NF_NAT_IRC
+ tristate
+ depends on NF_CONNTRACK && NF_NAT
+ default NF_NAT && NF_CONNTRACK_IRC
+
config NF_NAT_SIP
tristate
depends on NF_CONNTRACK && NF_NAT
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index 7d6d1a0..0dd7929 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -57,6 +57,7 @@
# NAT helpers
obj-$(CONFIG_NF_NAT_AMANDA) += nf_nat_amanda.o
obj-$(CONFIG_NF_NAT_FTP) += nf_nat_ftp.o
+obj-$(CONFIG_NF_NAT_IRC) += nf_nat_irc.o
obj-$(CONFIG_NF_NAT_SIP) += nf_nat_sip.o
# transparent proxy support
diff --git a/net/netfilter/nf_conntrack_irc.c b/net/netfilter/nf_conntrack_irc.c
index 95d097c..3b20aa77 100644
--- a/net/netfilter/nf_conntrack_irc.c
+++ b/net/netfilter/nf_conntrack_irc.c
@@ -205,8 +205,7 @@
IPPROTO_TCP, NULL, &port);
nf_nat_irc = rcu_dereference(nf_nat_irc_hook);
- if (nf_nat_irc && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
- ct->status & IPS_NAT_MASK)
+ if (nf_nat_irc && ct->status & IPS_NAT_MASK)
ret = nf_nat_irc(skb, ctinfo, protoff,
addr_beg_p - ib_ptr,
addr_end_p - addr_beg_p,
diff --git a/net/netfilter/nf_nat_irc.c b/net/netfilter/nf_nat_irc.c
new file mode 100644
index 0000000..1fedee6
--- /dev/null
+++ b/net/netfilter/nf_nat_irc.c
@@ -0,0 +1,93 @@
+/* IRC extension for TCP NAT alteration.
+ *
+ * (C) 2000-2001 by Harald Welte <[email protected]>
+ * (C) 2004 Rusty Russell <[email protected]> IBM Corporation
+ * based on a copy of RR's ip_nat_ftp.c
+ *
+ * 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/module.h>
+#include <linux/moduleparam.h>
+#include <linux/tcp.h>
+#include <linux/kernel.h>
+
+#include <net/netfilter/nf_nat.h>
+#include <net/netfilter/nf_nat_helper.h>
+#include <net/netfilter/nf_conntrack_helper.h>
+#include <net/netfilter/nf_conntrack_expect.h>
+#include <linux/netfilter/nf_conntrack_irc.h>
+
+MODULE_AUTHOR("Harald Welte <[email protected]>");
+MODULE_DESCRIPTION("IRC (DCC) NAT helper");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("ip_nat_irc");
+
+static unsigned int help(struct sk_buff *skb,
+ enum ip_conntrack_info ctinfo,
+ unsigned int protoff,
+ unsigned int matchoff,
+ unsigned int matchlen,
+ struct nf_conntrack_expect *exp)
+{
+ char buffer[sizeof("4294967296 65635")];
+ u_int16_t port;
+ unsigned int ret;
+
+ /* Reply comes from server. */
+ exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port;
+ exp->dir = IP_CT_DIR_REPLY;
+ 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++) {
+ int ret;
+
+ exp->tuple.dst.u.tcp.port = htons(port);
+ ret = nf_ct_expect_related(exp);
+ if (ret == 0)
+ break;
+ else if (ret != -EBUSY) {
+ port = 0;
+ break;
+ }
+ }
+
+ if (port == 0)
+ return NF_DROP;
+
+ ret = nf_nat_mangle_tcp_packet(skb, exp->master, ctinfo,
+ protoff, matchoff, matchlen, buffer,
+ strlen(buffer));
+ if (ret != NF_ACCEPT)
+ nf_ct_unexpect_related(exp);
+ return ret;
+}
+
+static void __exit nf_nat_irc_fini(void)
+{
+ RCU_INIT_POINTER(nf_nat_irc_hook, NULL);
+ synchronize_rcu();
+}
+
+static int __init nf_nat_irc_init(void)
+{
+ BUG_ON(nf_nat_irc_hook != NULL);
+ RCU_INIT_POINTER(nf_nat_irc_hook, help);
+ return 0;
+}
+
+/* Prior to 2.6.11, we had a ports param. No longer, but don't break users. */
+static int warn_set(const char *val, struct kernel_param *kp)
+{
+ printk(KERN_INFO KBUILD_MODNAME
+ ": kernel >= 2.6.10 only uses 'ports' for conntrack modules\n");
+ return 0;
+}
+module_param_call(ports, warn_set, NULL, NULL, 0);
+
+module_init(nf_nat_irc_init);
+module_exit(nf_nat_irc_fini);
