Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / netfilter / nf_nat_irc.c

diff --git a/kernel/net/netfilter/nf_nat_irc.c b/kernel/net/netfilter/nf_nat_irc.c
new file mode 100644 (file)
index 0000000..1fb2258
--- /dev/null
+++ b/kernel/net/netfilter/nf_nat_irc.c
@@ -0,0 +1,119 @@
+/* IRC extension for TCP NAT alteration.
+ *
+ * (C) 2000-2001 by Harald Welte <laforge@gnumonks.org>
+ * (C) 2004 Rusty Russell <rusty@rustcorp.com.au> 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 <laforge@gnumonks.org>");
+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")];
+       struct nf_conn *ct = exp->master;
+       union nf_inet_addr newaddr;
+       u_int16_t port;
+       unsigned int ret;
+
+       /* Reply comes from server. */
+       newaddr = ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u3;
+
+       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) {
+               nf_ct_helper_log(skb, ct, "all ports in use");
+               return NF_DROP;
+       }
+
+       /* strlen("\1DCC CHAT chat AAAAAAAA P\1\n")=27
+        * strlen("\1DCC SCHAT chat AAAAAAAA P\1\n")=28
+        * strlen("\1DCC SEND F AAAAAAAA P S\1\n")=26
+        * strlen("\1DCC MOVE F AAAAAAAA P S\1\n")=26
+        * strlen("\1DCC TSEND F AAAAAAAA P S\1\n")=27
+        *
+        * AAAAAAAAA: bound addr (1.0.0.0==16777216, min 8 digits,
+        *                        255.255.255.255==4294967296, 10 digits)
+        * P:         bound port (min 1 d, max 5d (65635))
+        * F:         filename   (min 1 d )
+        * S:         size       (min 1 d )
+        * 0x01, \n:  terminators
+        */
+       /* AAA = "us", ie. where server normally talks to. */
+       snprintf(buffer, sizeof(buffer), "%u %u", ntohl(newaddr.ip), port);
+       pr_debug("nf_nat_irc: inserting '%s' == %pI4, port %u\n",
+                buffer, &newaddr.ip, port);
+
+       ret = nf_nat_mangle_tcp_packet(skb, ct, ctinfo, protoff, matchoff,
+                                      matchlen, buffer, strlen(buffer));
+       if (ret != NF_ACCEPT) {
+               nf_ct_helper_log(skb, ct, "cannot mangle packet");
+               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);