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https://github.com/openwrt/openwrt.git
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Added support for MMS connection tracking
SVN-Revision: 2640
This commit is contained in:
Florian Fainelli
parent
f922715fbb
commit
4cb219eae2
@ -364,6 +364,7 @@ CONFIG_IP_NF_CT_PROTO_GRE=m
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CONFIG_IP_NF_PPTP=m
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CONFIG_IP_NF_PPTP=m
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CONFIG_IP_NF_SIP=m
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CONFIG_IP_NF_SIP=m
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CONFIG_IP_NF_H323=m
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CONFIG_IP_NF_H323=m
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CONFIG_IP_NF_MMS=m
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CONFIG_IP_NF_QUEUE=m
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CONFIG_IP_NF_QUEUE=m
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CONFIG_IP_NF_IPTABLES=y
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CONFIG_IP_NF_IPTABLES=y
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CONFIG_IP_NF_MATCH_LIMIT=m
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CONFIG_IP_NF_MATCH_LIMIT=m
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@ -414,6 +415,7 @@ CONFIG_IP_NF_TARGET_NETMAP=m
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CONFIG_IP_NF_NAT_PPTP=m
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CONFIG_IP_NF_NAT_PPTP=m
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CONFIG_IP_NF_NAT_SIP=m
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CONFIG_IP_NF_NAT_SIP=m
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CONFIG_IP_NF_NAT_H323=m
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CONFIG_IP_NF_NAT_H323=m
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CONFIG_IP_NF_NAT_MMS=m
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CONFIG_IP_NF_NAT_PROTO_GRE=m
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CONFIG_IP_NF_NAT_PROTO_GRE=m
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CONFIG_IP_NF_NAT_AMANDA=m
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CONFIG_IP_NF_NAT_AMANDA=m
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CONFIG_IP_NF_NAT_SNMP_BASIC=m
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CONFIG_IP_NF_NAT_SNMP_BASIC=m
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@ -0,0 +1,739 @@
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diff -urN linux-2.4.32/net/ipv4/netfilter/Config.in linux-2.4.32/net/ipv4/netfilter/Config.in
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--- linux-2.4.32/net/ipv4/netfilter/Config.in 2005-12-12 16:29:01.000000000 +0100
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+++ linux-2.4.32/net/ipv4/netfilter/Config.in 2005-12-12 16:35:37.000000000 +0100
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@@ -17,6 +17,7 @@
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dep_tristate ' PPTP protocol support' CONFIG_IP_NF_PPTP $CONFIG_IP_NF_CT_PROTO_GRE
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dep_tristate ' SIP protocol support' CONFIG_IP_NF_SIP $CONFIG_IP_NF_CONNTRACK
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dep_tristate ' H.323 (netmeeting) support' CONFIG_IP_NF_H323 $CONFIG_IP_NF_CONNTRACK
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+ dep_tristate ' MMS protocol support' CONFIG_IP_NF_MMS $CONFIG_IP_NF_CONNTRACK
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fi
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if [ "$CONFIG_EXPERIMENTAL" = "y" ]; then
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@@ -120,6 +121,13 @@
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define_tristate CONFIG_IP_NF_NAT_H323 $CONFIG_IP_NF_NAT
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fi
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fi
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+ if [ "$CONFIG_IP_NF_MMS" = "m" ]; then
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+ define_tristate CONFIG_IP_NF_NAT_MMS m
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+ else
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+ if [ "$CONFIG_IP_NF_MMS" = "y" ]; then
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+ define_tristate CONFIG_IP_NF_NAT_MMS $CONFIG_IP_NF_NAT
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+ fi
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+ fi
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if [ "$CONFIG_IP_NF_AMANDA" = "m" ]; then
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define_tristate CONFIG_IP_NF_NAT_AMANDA m
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else
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diff -urN linux-2.4.32/net/ipv4/netfilter/Makefile linux-2.4.32/net/ipv4/netfilter/Makefile
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--- linux-2.4.32/net/ipv4/netfilter/Makefile 2005-12-12 16:29:01.000000000 +0100
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+++ linux-2.4.32/net/ipv4/netfilter/Makefile 2005-12-12 16:36:26.000000000 +0100
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@@ -61,6 +61,10 @@
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ifdef CONFIG_IP_NF_NAT_H323
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export-objs += ip_conntrack_h323.o
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endif
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+obj-$(CONFIG_IP_NF_MMS) += ip_conntrack_mms.o
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+ifdef CONFIG_IP_NF_NAT_MMS
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+ export-objs += ip_conntrack_mms.o
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+endif
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# NAT helpers
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@@ -72,6 +76,7 @@
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obj-$(CONFIG_IP_NF_NAT_PPTP) += ip_nat_pptp.o
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obj-$(CONFIG_IP_NF_NAT_SIP) += ip_nat_sip.o
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obj-$(CONFIG_IP_NF_NAT_H323) += ip_nat_h323.o
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+obj-$(CONFIG_IP_NF_NAT_MMS) += ip_nat_mms.o
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# generic IP tables
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obj-$(CONFIG_IP_NF_IPTABLES) += ip_tables.o
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diff -urN linux-2.4.32/net/ipv4/netfilter/ip_conntrack_mms.c linux-2.4.32/net/ipv4/netfilter/ip_conntrack_mms.c
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--- linux-2.4.32/net/ipv4/netfilter/ip_conntrack_mms.c 1970-01-01 01:00:00.000000000 +0100
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+++ linux-2.4.32/net/ipv4/netfilter/ip_conntrack_mms.c 2005-12-12 16:32:54.000000000 +0100
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@@ -0,0 +1,292 @@
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+/* MMS extension for IP connection tracking
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+ * (C) 2002 by Filip Sneppe <filip.sneppe@cronos.be>
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+ * based on ip_conntrack_ftp.c and ip_conntrack_irc.c
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+ *
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+ * ip_conntrack_mms.c v0.3 2002-09-22
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+ *
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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public License
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+ * as published by the Free Software Foundation; either version
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+ * 2 of the License, or (at your option) any later version.
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+ *
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+ * Module load syntax:
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+ * insmod ip_conntrack_mms.o ports=port1,port2,...port<MAX_PORTS>
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+ *
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+ * Please give the ports of all MMS servers You wish to connect to.
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+ * If you don't specify ports, the default will be TCP port 1755.
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+ *
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+ * More info on MMS protocol, firewalls and NAT:
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+ * http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnwmt/html/MMSFirewall.asp
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+ * http://www.microsoft.com/windows/windowsmedia/serve/firewall.asp
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+ *
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+ * The SDP project people are reverse-engineering MMS:
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+ * http://get.to/sdp
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+ */
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+
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+#include <linux/config.h>
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+#include <linux/module.h>
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+#include <linux/netfilter.h>
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+#include <linux/ip.h>
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+#include <linux/ctype.h>
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+#include <net/checksum.h>
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+#include <net/tcp.h>
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+
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+#include <linux/netfilter_ipv4/lockhelp.h>
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+#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
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+#include <linux/netfilter_ipv4/ip_conntrack_mms.h>
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+
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+DECLARE_LOCK(ip_mms_lock);
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+struct module *ip_conntrack_mms = THIS_MODULE;
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+
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+#define MAX_PORTS 8
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+static int ports[MAX_PORTS];
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+static int ports_c;
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+#ifdef MODULE_PARM
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+MODULE_PARM(ports, "1-" __MODULE_STRING(MAX_PORTS) "i");
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+#endif
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+
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+#define DEBUGP(format, args...)
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+
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+#ifdef CONFIG_IP_NF_NAT_NEEDED
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+EXPORT_SYMBOL(ip_mms_lock);
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+#endif
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+
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+MODULE_AUTHOR("Filip Sneppe <filip.sneppe@cronos.be>");
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+MODULE_DESCRIPTION("Microsoft Windows Media Services (MMS) connection tracking module");
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+MODULE_LICENSE("GPL");
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+
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+/* #define isdigit(c) (c >= '0' && c <= '9') */
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+
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+/* copied from drivers/usb/serial/io_edgeport.c - not perfect but will do the trick */
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+static void unicode_to_ascii (char *string, short *unicode, int unicode_size)
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+{
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+ int i;
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+ for (i = 0; i < unicode_size; ++i) {
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+ string[i] = (char)(unicode[i]);
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+ }
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+ string[unicode_size] = 0x00;
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+}
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+
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+__inline static int atoi(char *s)
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+{
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+ int i=0;
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+ while (isdigit(*s)) {
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+ i = i*10 + *(s++) - '0';
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+ }
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+ return i;
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+}
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+
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+/* convert ip address string like "192.168.0.10" to unsigned int */
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+__inline static u_int32_t asciiiptoi(char *s)
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+{
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+ unsigned int i, j, k;
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+
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+ for(i=k=0; k<3; ++k, ++s, i<<=8) {
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+ i+=atoi(s);
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+ for(j=0; (*(++s) != '.') && (j<3); ++j)
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+ ;
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+ }
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+ i+=atoi(s);
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+ return ntohl(i);
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+}
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+
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+int parse_mms(const char *data,
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+ const unsigned int datalen,
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+ u_int32_t *mms_ip,
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+ u_int16_t *mms_proto,
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+ u_int16_t *mms_port,
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+ char **mms_string_b,
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+ char **mms_string_e,
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+ char **mms_padding_e)
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+{
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+ int unicode_size, i;
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+ char tempstring[28]; /* "\\255.255.255.255\UDP\65535" */
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+ char getlengthstring[28];
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+
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+ for(unicode_size=0;
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+ (char) *(data+(MMS_SRV_UNICODE_STRING_OFFSET+unicode_size*2)) != (char)0;
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+ unicode_size++)
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+ if ((unicode_size == 28) || (MMS_SRV_UNICODE_STRING_OFFSET+unicode_size*2 >= datalen))
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+ return -1; /* out of bounds - incomplete packet */
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+
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+ unicode_to_ascii(tempstring, (short *)(data+MMS_SRV_UNICODE_STRING_OFFSET), unicode_size);
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+ DEBUGP("ip_conntrack_mms: offset 60: %s\n", (const char *)(tempstring));
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+
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+ /* IP address ? */
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+ *mms_ip = asciiiptoi(tempstring+2);
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+
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+ i=sprintf(getlengthstring, "%u.%u.%u.%u", HIPQUAD(*mms_ip));
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+
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+ /* protocol ? */
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+ if(strncmp(tempstring+3+i, "TCP", 3)==0)
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+ *mms_proto = IPPROTO_TCP;
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+ else if(strncmp(tempstring+3+i, "UDP", 3)==0)
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+ *mms_proto = IPPROTO_UDP;
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+
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+ /* port ? */
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+ *mms_port = atoi(tempstring+7+i);
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+
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+ /* we store a pointer to the beginning of the "\\a.b.c.d\proto\port"
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+ unicode string, one to the end of the string, and one to the end
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+ of the packet, since we must keep track of the number of bytes
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+ between end of the unicode string and the end of packet (padding) */
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+ *mms_string_b = (char *)(data + MMS_SRV_UNICODE_STRING_OFFSET);
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+ *mms_string_e = (char *)(data + MMS_SRV_UNICODE_STRING_OFFSET + unicode_size * 2);
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+ *mms_padding_e = (char *)(data + datalen); /* looks funny, doesn't it */
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+ return 0;
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+}
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+
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+
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+static int help(const struct iphdr *iph, size_t len,
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+ struct ip_conntrack *ct,
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+ enum ip_conntrack_info ctinfo)
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+{
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+ /* tcplen not negative guaranteed by ip_conntrack_tcp.c */
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+ struct tcphdr *tcph = (void *)iph + iph->ihl * 4;
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+ const char *data = (const char *)tcph + tcph->doff * 4;
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+ unsigned int tcplen = len - iph->ihl * 4;
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+ unsigned int datalen = tcplen - tcph->doff * 4;
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+ int dir = CTINFO2DIR(ctinfo);
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+ struct ip_conntrack_expect expect, *exp = &expect;
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+ struct ip_ct_mms_expect *exp_mms_info = &exp->help.exp_mms_info;
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+
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+ u_int32_t mms_ip;
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+ u_int16_t mms_proto;
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+ char mms_proto_string[8];
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+ u_int16_t mms_port;
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+ char *mms_string_b, *mms_string_e, *mms_padding_e;
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+
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+ /* Until there's been traffic both ways, don't look in packets. */
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+ if (ctinfo != IP_CT_ESTABLISHED
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+ && ctinfo != IP_CT_ESTABLISHED+IP_CT_IS_REPLY) {
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+ DEBUGP("ip_conntrack_mms: Conntrackinfo = %u\n", ctinfo);
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+ return NF_ACCEPT;
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+ }
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+
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+ /* Not whole TCP header? */
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+ if (tcplen < sizeof(struct tcphdr) || tcplen < tcph->doff*4) {
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+ DEBUGP("ip_conntrack_mms: tcplen = %u\n", (unsigned)tcplen);
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+ return NF_ACCEPT;
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+ }
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+
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+ /* Checksum invalid? Ignore. */
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+ if (tcp_v4_check(tcph, tcplen, iph->saddr, iph->daddr,
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+ csum_partial((char *)tcph, tcplen, 0))) {
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+ DEBUGP("mms_help: bad csum: %p %u %u.%u.%u.%u %u.%u.%u.%u\n",
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+ tcph, tcplen, NIPQUAD(iph->saddr),
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+ NIPQUAD(iph->daddr));
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+ return NF_ACCEPT;
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+ }
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+
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+ /* Only look at packets with 0x00030002/196610 on bytes 36->39 of TCP payload */
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+ if( (MMS_SRV_MSG_OFFSET < datalen) &&
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+ ((*(u32 *)(data+MMS_SRV_MSG_OFFSET)) == MMS_SRV_MSG_ID)) {
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+ DEBUGP("ip_conntrack_mms: offset 37: %u %u %u %u, datalen:%u\n",
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+ (u8)*(data+36), (u8)*(data+37),
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+ (u8)*(data+38), (u8)*(data+39),
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+ datalen);
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+ if(parse_mms(data, datalen, &mms_ip, &mms_proto, &mms_port,
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+ &mms_string_b, &mms_string_e, &mms_padding_e))
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+ if(net_ratelimit())
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+ printk(KERN_WARNING
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+ "ip_conntrack_mms: Unable to parse data payload\n");
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+
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+ memset(&expect, 0, sizeof(expect));
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+
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+ sprintf(mms_proto_string, "(%u)", mms_proto);
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+ DEBUGP("ip_conntrack_mms: adding %s expectation %u.%u.%u.%u -> %u.%u.%u.%u:%u\n",
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+ mms_proto == IPPROTO_TCP ? "TCP"
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+ : mms_proto == IPPROTO_UDP ? "UDP":mms_proto_string,
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+ NIPQUAD(ct->tuplehash[!dir].tuple.src.ip),
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+ NIPQUAD(mms_ip),
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+ mms_port);
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+
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+ /* it's possible that the client will just ask the server to tunnel
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+ the stream over the same TCP session (from port 1755): there's
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+ shouldn't be a need to add an expectation in that case, but it
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+ makes NAT packet mangling so much easier */
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+ LOCK_BH(&ip_mms_lock);
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+
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+ DEBUGP("ip_conntrack_mms: tcph->seq = %u\n", tcph->seq);
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+
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+ exp->seq = ntohl(tcph->seq) + (mms_string_b - data);
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+ exp_mms_info->len = (mms_string_e - mms_string_b);
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+ exp_mms_info->padding = (mms_padding_e - mms_string_e);
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+ exp_mms_info->port = mms_port;
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+
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+ DEBUGP("ip_conntrack_mms: wrote info seq=%u (ofs=%u), len=%d, padding=%u\n",
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+ exp->seq, (mms_string_e - data), exp_mms_info->len, exp_mms_info->padding);
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+
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+ exp->tuple = ((struct ip_conntrack_tuple)
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+ { { ct->tuplehash[!dir].tuple.src.ip, { 0 } },
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+ { mms_ip,
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+ { (__u16) ntohs(mms_port) },
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+ mms_proto } }
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+ );
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+ exp->mask = ((struct ip_conntrack_tuple)
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+ { { 0xFFFFFFFF, { 0 } },
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+ { 0xFFFFFFFF, { 0xFFFF }, 0xFFFF }});
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+ exp->expectfn = NULL;
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+ ip_conntrack_expect_related(ct, &expect);
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+ UNLOCK_BH(&ip_mms_lock);
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ return NF_ACCEPT;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static struct ip_conntrack_helper mms[MAX_PORTS];
|
||||||
|
+static char mms_names[MAX_PORTS][10];
|
||||||
|
+
|
||||||
|
+/* Not __exit: called from init() */
|
||||||
|
+static void fini(void)
|
||||||
|
+{
|
||||||
|
+ int i;
|
||||||
|
+ for (i = 0; (i < MAX_PORTS) && ports[i]; i++) {
|
||||||
|
+ DEBUGP("ip_conntrack_mms: unregistering helper for port %d\n",
|
||||||
|
+ ports[i]);
|
||||||
|
+ ip_conntrack_helper_unregister(&mms[i]);
|
||||||
|
+ }
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static int __init init(void)
|
||||||
|
+{
|
||||||
|
+ int i, ret;
|
||||||
|
+ char *tmpname;
|
||||||
|
+
|
||||||
|
+ if (ports[0] == 0)
|
||||||
|
+ ports[0] = MMS_PORT;
|
||||||
|
+
|
||||||
|
+ for (i = 0; (i < MAX_PORTS) && ports[i]; i++) {
|
||||||
|
+ memset(&mms[i], 0, sizeof(struct ip_conntrack_helper));
|
||||||
|
+ mms[i].tuple.src.u.tcp.port = htons(ports[i]);
|
||||||
|
+ mms[i].tuple.dst.protonum = IPPROTO_TCP;
|
||||||
|
+ mms[i].mask.src.u.tcp.port = 0xFFFF;
|
||||||
|
+ mms[i].mask.dst.protonum = 0xFFFF;
|
||||||
|
+ mms[i].max_expected = 1;
|
||||||
|
+ mms[i].timeout = 0;
|
||||||
|
+ mms[i].flags = IP_CT_HELPER_F_REUSE_EXPECT;
|
||||||
|
+ mms[i].me = THIS_MODULE;
|
||||||
|
+ mms[i].help = help;
|
||||||
|
+
|
||||||
|
+ tmpname = &mms_names[i][0];
|
||||||
|
+ if (ports[i] == MMS_PORT)
|
||||||
|
+ sprintf(tmpname, "mms");
|
||||||
|
+ else
|
||||||
|
+ sprintf(tmpname, "mms-%d", ports[i]);
|
||||||
|
+ mms[i].name = tmpname;
|
||||||
|
+
|
||||||
|
+ DEBUGP("ip_conntrack_mms: registering helper for port %d\n",
|
||||||
|
+ ports[i]);
|
||||||
|
+ ret = ip_conntrack_helper_register(&mms[i]);
|
||||||
|
+
|
||||||
|
+ if (ret) {
|
||||||
|
+ fini();
|
||||||
|
+ return ret;
|
||||||
|
+ }
|
||||||
|
+ ports_c++;
|
||||||
|
+ }
|
||||||
|
+ return 0;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+module_init(init);
|
||||||
|
+module_exit(fini);
|
||||||
|
diff -urN linux-2.4.32/net/ipv4/netfilter/ip_nat_mms.c linux-2.4.32/net/ipv4/netfilter/ip_nat_mms.c
|
||||||
|
--- linux-2.4.32/net/ipv4/netfilter/ip_nat_mms.c 1970-01-01 01:00:00.000000000 +0100
|
||||||
|
+++ linux-2.4.32/net/ipv4/netfilter/ip_nat_mms.c 2005-12-12 16:32:54.000000000 +0100
|
||||||
|
@@ -0,0 +1,330 @@
|
||||||
|
+/* MMS extension for TCP NAT alteration.
|
||||||
|
+ * (C) 2002 by Filip Sneppe <filip.sneppe@cronos.be>
|
||||||
|
+ * based on ip_nat_ftp.c and ip_nat_irc.c
|
||||||
|
+ *
|
||||||
|
+ * ip_nat_mms.c v0.3 2002-09-22
|
||||||
|
+ *
|
||||||
|
+ * 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.
|
||||||
|
+ *
|
||||||
|
+ * Module load syntax:
|
||||||
|
+ * insmod ip_nat_mms.o ports=port1,port2,...port<MAX_PORTS>
|
||||||
|
+ *
|
||||||
|
+ * Please give the ports of all MMS servers You wish to connect to.
|
||||||
|
+ * If you don't specify ports, the default will be TCP port 1755.
|
||||||
|
+ *
|
||||||
|
+ * More info on MMS protocol, firewalls and NAT:
|
||||||
|
+ * http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnwmt/html/MMSFirewall.asp
|
||||||
|
+ * http://www.microsoft.com/windows/windowsmedia/serve/firewall.asp
|
||||||
|
+ *
|
||||||
|
+ * The SDP project people are reverse-engineering MMS:
|
||||||
|
+ * http://get.to/sdp
|
||||||
|
+ */
|
||||||
|
+
|
||||||
|
+
|
||||||
|
+#include <linux/module.h>
|
||||||
|
+#include <linux/netfilter_ipv4.h>
|
||||||
|
+#include <linux/ip.h>
|
||||||
|
+#include <linux/tcp.h>
|
||||||
|
+#include <net/tcp.h>
|
||||||
|
+#include <linux/netfilter_ipv4/ip_nat.h>
|
||||||
|
+#include <linux/netfilter_ipv4/ip_nat_helper.h>
|
||||||
|
+#include <linux/netfilter_ipv4/ip_nat_rule.h>
|
||||||
|
+#include <linux/netfilter_ipv4/ip_conntrack_mms.h>
|
||||||
|
+#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
|
||||||
|
+
|
||||||
|
+#define DEBUGP(format, args...)
|
||||||
|
+#define DUMP_BYTES(address, counter)
|
||||||
|
+
|
||||||
|
+#define MAX_PORTS 8
|
||||||
|
+static int ports[MAX_PORTS];
|
||||||
|
+static int ports_c = 0;
|
||||||
|
+
|
||||||
|
+#ifdef MODULE_PARM
|
||||||
|
+MODULE_PARM(ports, "1-" __MODULE_STRING(MAX_PORTS) "i");
|
||||||
|
+#endif
|
||||||
|
+
|
||||||
|
+MODULE_AUTHOR("Filip Sneppe <filip.sneppe@cronos.be>");
|
||||||
|
+MODULE_DESCRIPTION("Microsoft Windows Media Services (MMS) NAT module");
|
||||||
|
+MODULE_LICENSE("GPL");
|
||||||
|
+
|
||||||
|
+DECLARE_LOCK_EXTERN(ip_mms_lock);
|
||||||
|
+
|
||||||
|
+
|
||||||
|
+static int mms_data_fixup(const struct ip_ct_mms_expect *ct_mms_info,
|
||||||
|
+ struct ip_conntrack *ct,
|
||||||
|
+ struct sk_buff **pskb,
|
||||||
|
+ enum ip_conntrack_info ctinfo,
|
||||||
|
+ struct ip_conntrack_expect *expect)
|
||||||
|
+{
|
||||||
|
+ u_int32_t newip;
|
||||||
|
+ struct ip_conntrack_tuple t;
|
||||||
|
+ struct iphdr *iph = (*pskb)->nh.iph;
|
||||||
|
+ struct tcphdr *tcph = (void *) iph + iph->ihl * 4;
|
||||||
|
+ char *data = (char *)tcph + tcph->doff * 4;
|
||||||
|
+ int i, j, k, port;
|
||||||
|
+ u_int16_t mms_proto;
|
||||||
|
+
|
||||||
|
+ u_int32_t *mms_chunkLenLV = (u_int32_t *)(data + MMS_SRV_CHUNKLENLV_OFFSET);
|
||||||
|
+ u_int32_t *mms_chunkLenLM = (u_int32_t *)(data + MMS_SRV_CHUNKLENLM_OFFSET);
|
||||||
|
+ u_int32_t *mms_messageLength = (u_int32_t *)(data + MMS_SRV_MESSAGELENGTH_OFFSET);
|
||||||
|
+
|
||||||
|
+ int zero_padding;
|
||||||
|
+
|
||||||
|
+ char buffer[28]; /* "\\255.255.255.255\UDP\65635" * 2 (for unicode) */
|
||||||
|
+ char unicode_buffer[75]; /* 27*2 (unicode) + 20 + 1 */
|
||||||
|
+ char proto_string[6];
|
||||||
|
+
|
||||||
|
+ MUST_BE_LOCKED(&ip_mms_lock);
|
||||||
|
+
|
||||||
|
+ /* what was the protocol again ? */
|
||||||
|
+ mms_proto = expect->tuple.dst.protonum;
|
||||||
|
+ sprintf(proto_string, "%u", mms_proto);
|
||||||
|
+
|
||||||
|
+ DEBUGP("ip_nat_mms: mms_data_fixup: info (seq %u + %u) in %u, proto %s\n",
|
||||||
|
+ expect->seq, ct_mms_info->len, ntohl(tcph->seq),
|
||||||
|
+ mms_proto == IPPROTO_UDP ? "UDP"
|
||||||
|
+ : mms_proto == IPPROTO_TCP ? "TCP":proto_string);
|
||||||
|
+
|
||||||
|
+ newip = ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.ip;
|
||||||
|
+
|
||||||
|
+ /* Alter conntrack's expectations. */
|
||||||
|
+ t = expect->tuple;
|
||||||
|
+ t.dst.ip = newip;
|
||||||
|
+ for (port = ct_mms_info->port; port != 0; port++) {
|
||||||
|
+ t.dst.u.tcp.port = htons(port);
|
||||||
|
+ if (ip_conntrack_change_expect(expect, &t) == 0) {
|
||||||
|
+ DEBUGP("ip_nat_mms: mms_data_fixup: using port %d\n", port);
|
||||||
|
+ break;
|
||||||
|
+ }
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ if(port == 0)
|
||||||
|
+ return 0;
|
||||||
|
+
|
||||||
|
+ sprintf(buffer, "\\\\%u.%u.%u.%u\\%s\\%u",
|
||||||
|
+ NIPQUAD(newip),
|
||||||
|
+ expect->tuple.dst.protonum == IPPROTO_UDP ? "UDP"
|
||||||
|
+ : expect->tuple.dst.protonum == IPPROTO_TCP ? "TCP":proto_string,
|
||||||
|
+ port);
|
||||||
|
+ DEBUGP("ip_nat_mms: new unicode string=%s\n", buffer);
|
||||||
|
+
|
||||||
|
+ memset(unicode_buffer, 0, sizeof(char)*75);
|
||||||
|
+
|
||||||
|
+ for (i=0; i<strlen(buffer); ++i)
|
||||||
|
+ *(unicode_buffer+i*2)=*(buffer+i);
|
||||||
|
+
|
||||||
|
+ DEBUGP("ip_nat_mms: mms_data_fixup: padding: %u len: %u\n", ct_mms_info->padding, ct_mms_info->len);
|
||||||
|
+ DEBUGP("ip_nat_mms: mms_data_fixup: offset: %u\n", MMS_SRV_UNICODE_STRING_OFFSET+ct_mms_info->len);
|
||||||
|
+ DUMP_BYTES(data+MMS_SRV_UNICODE_STRING_OFFSET, 60);
|
||||||
|
+
|
||||||
|
+ /* add end of packet to it */
|
||||||
|
+ for (j=0; j<ct_mms_info->padding; ++j) {
|
||||||
|
+ DEBUGP("ip_nat_mms: mms_data_fixup: i=%u j=%u byte=%u\n",
|
||||||
|
+ i, j, (u8)*(data+MMS_SRV_UNICODE_STRING_OFFSET+ct_mms_info->len+j));
|
||||||
|
+ *(unicode_buffer+i*2+j) = *(data+MMS_SRV_UNICODE_STRING_OFFSET+ct_mms_info->len+j);
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ /* pad with zeroes at the end ? see explanation of weird math below */
|
||||||
|
+ zero_padding = (8-(strlen(buffer)*2 + ct_mms_info->padding + 4)%8)%8;
|
||||||
|
+ for (k=0; k<zero_padding; ++k)
|
||||||
|
+ *(unicode_buffer+i*2+j+k)= (char)0;
|
||||||
|
+
|
||||||
|
+ DEBUGP("ip_nat_mms: mms_data_fixup: zero_padding = %u\n", zero_padding);
|
||||||
|
+ DEBUGP("ip_nat_mms: original=> chunkLenLV=%u chunkLenLM=%u messageLength=%u\n",
|
||||||
|
+ *mms_chunkLenLV, *mms_chunkLenLM, *mms_messageLength);
|
||||||
|
+
|
||||||
|
+ /* explanation, before I forget what I did:
|
||||||
|
+ strlen(buffer)*2 + ct_mms_info->padding + 4 must be divisable by 8;
|
||||||
|
+ divide by 8 and add 3 to compute the mms_chunkLenLM field,
|
||||||
|
+ but note that things may have to be padded with zeroes to align by 8
|
||||||
|
+ bytes, hence we add 7 and divide by 8 to get the correct length */
|
||||||
|
+ *mms_chunkLenLM = (u_int32_t) (3+(strlen(buffer)*2+ct_mms_info->padding+11)/8);
|
||||||
|
+ *mms_chunkLenLV = *mms_chunkLenLM+2;
|
||||||
|
+ *mms_messageLength = *mms_chunkLenLV*8;
|
||||||
|
+
|
||||||
|
+ DEBUGP("ip_nat_mms: modified=> chunkLenLV=%u chunkLenLM=%u messageLength=%u\n",
|
||||||
|
+ *mms_chunkLenLV, *mms_chunkLenLM, *mms_messageLength);
|
||||||
|
+
|
||||||
|
+ ip_nat_mangle_tcp_packet(pskb, ct, ctinfo,
|
||||||
|
+ expect->seq - ntohl(tcph->seq),
|
||||||
|
+ ct_mms_info->len + ct_mms_info->padding, unicode_buffer,
|
||||||
|
+ strlen(buffer)*2 + ct_mms_info->padding + zero_padding);
|
||||||
|
+ DUMP_BYTES(unicode_buffer, 60);
|
||||||
|
+
|
||||||
|
+ return 1;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static unsigned int
|
||||||
|
+mms_nat_expected(struct sk_buff **pskb,
|
||||||
|
+ unsigned int hooknum,
|
||||||
|
+ struct ip_conntrack *ct,
|
||||||
|
+ struct ip_nat_info *info)
|
||||||
|
+{
|
||||||
|
+ struct ip_nat_multi_range mr;
|
||||||
|
+ u_int32_t newdstip, newsrcip, newip;
|
||||||
|
+
|
||||||
|
+ struct ip_conntrack *master = master_ct(ct);
|
||||||
|
+
|
||||||
|
+ IP_NF_ASSERT(info);
|
||||||
|
+ IP_NF_ASSERT(master);
|
||||||
|
+
|
||||||
|
+ IP_NF_ASSERT(!(info->initialized & (1 << HOOK2MANIP(hooknum))));
|
||||||
|
+
|
||||||
|
+ DEBUGP("ip_nat_mms: mms_nat_expected: We have a connection!\n");
|
||||||
|
+
|
||||||
|
+ newdstip = master->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.ip;
|
||||||
|
+ newsrcip = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.ip;
|
||||||
|
+ DEBUGP("ip_nat_mms: mms_nat_expected: hook %s: newsrc->newdst %u.%u.%u.%u->%u.%u.%u.%u\n",
|
||||||
|
+ hooknum == NF_IP_POST_ROUTING ? "POSTROUTING"
|
||||||
|
+ : hooknum == NF_IP_PRE_ROUTING ? "PREROUTING"
|
||||||
|
+ : hooknum == NF_IP_LOCAL_OUT ? "OUTPUT" : "???",
|
||||||
|
+ NIPQUAD(newsrcip), NIPQUAD(newdstip));
|
||||||
|
+
|
||||||
|
+ if (HOOK2MANIP(hooknum) == IP_NAT_MANIP_SRC)
|
||||||
|
+ newip = newsrcip;
|
||||||
|
+ else
|
||||||
|
+ newip = newdstip;
|
||||||
|
+
|
||||||
|
+ DEBUGP("ip_nat_mms: mms_nat_expected: IP to %u.%u.%u.%u\n", NIPQUAD(newip));
|
||||||
|
+
|
||||||
|
+ mr.rangesize = 1;
|
||||||
|
+ /* We don't want to manip the per-protocol, just the IPs. */
|
||||||
|
+ mr.range[0].flags = IP_NAT_RANGE_MAP_IPS;
|
||||||
|
+ mr.range[0].min_ip = mr.range[0].max_ip = newip;
|
||||||
|
+
|
||||||
|
+ return ip_nat_setup_info(ct, &mr, hooknum);
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+
|
||||||
|
+static unsigned int mms_nat_help(struct ip_conntrack *ct,
|
||||||
|
+ struct ip_conntrack_expect *exp,
|
||||||
|
+ struct ip_nat_info *info,
|
||||||
|
+ enum ip_conntrack_info ctinfo,
|
||||||
|
+ unsigned int hooknum,
|
||||||
|
+ struct sk_buff **pskb)
|
||||||
|
+{
|
||||||
|
+ struct iphdr *iph = (*pskb)->nh.iph;
|
||||||
|
+ struct tcphdr *tcph = (void *) iph + iph->ihl * 4;
|
||||||
|
+ unsigned int datalen;
|
||||||
|
+ int dir;
|
||||||
|
+ struct ip_ct_mms_expect *ct_mms_info;
|
||||||
|
+
|
||||||
|
+ if (!exp)
|
||||||
|
+ DEBUGP("ip_nat_mms: no exp!!");
|
||||||
|
+
|
||||||
|
+ ct_mms_info = &exp->help.exp_mms_info;
|
||||||
|
+
|
||||||
|
+ /* Only mangle things once: original direction in POST_ROUTING
|
||||||
|
+ and reply direction on PRE_ROUTING. */
|
||||||
|
+ dir = CTINFO2DIR(ctinfo);
|
||||||
|
+ if (!((hooknum == NF_IP_POST_ROUTING && dir == IP_CT_DIR_ORIGINAL)
|
||||||
|
+ ||(hooknum == NF_IP_PRE_ROUTING && dir == IP_CT_DIR_REPLY))) {
|
||||||
|
+ DEBUGP("ip_nat_mms: mms_nat_help: not touching dir %s at hook %s\n",
|
||||||
|
+ dir == IP_CT_DIR_ORIGINAL ? "ORIG" : "REPLY",
|
||||||
|
+ hooknum == NF_IP_POST_ROUTING ? "POSTROUTING"
|
||||||
|
+ : hooknum == NF_IP_PRE_ROUTING ? "PREROUTING"
|
||||||
|
+ : hooknum == NF_IP_LOCAL_OUT ? "OUTPUT" : "???");
|
||||||
|
+ return NF_ACCEPT;
|
||||||
|
+ }
|
||||||
|
+ DEBUGP("ip_nat_mms: mms_nat_help: beyond not touching (dir %s at hook %s)\n",
|
||||||
|
+ dir == IP_CT_DIR_ORIGINAL ? "ORIG" : "REPLY",
|
||||||
|
+ hooknum == NF_IP_POST_ROUTING ? "POSTROUTING"
|
||||||
|
+ : hooknum == NF_IP_PRE_ROUTING ? "PREROUTING"
|
||||||
|
+ : hooknum == NF_IP_LOCAL_OUT ? "OUTPUT" : "???");
|
||||||
|
+
|
||||||
|
+ datalen = (*pskb)->len - iph->ihl * 4 - tcph->doff * 4;
|
||||||
|
+
|
||||||
|
+ DEBUGP("ip_nat_mms: mms_nat_help: %u+%u=%u %u %u\n", exp->seq, ct_mms_info->len,
|
||||||
|
+ exp->seq + ct_mms_info->len,
|
||||||
|
+ ntohl(tcph->seq),
|
||||||
|
+ ntohl(tcph->seq) + datalen);
|
||||||
|
+
|
||||||
|
+ LOCK_BH(&ip_mms_lock);
|
||||||
|
+ /* Check wether the whole IP/proto/port pattern is carried in the payload */
|
||||||
|
+ if (between(exp->seq + ct_mms_info->len,
|
||||||
|
+ ntohl(tcph->seq),
|
||||||
|
+ ntohl(tcph->seq) + datalen)) {
|
||||||
|
+ if (!mms_data_fixup(ct_mms_info, ct, pskb, ctinfo, exp)) {
|
||||||
|
+ UNLOCK_BH(&ip_mms_lock);
|
||||||
|
+ return NF_DROP;
|
||||||
|
+ }
|
||||||
|
+ } else {
|
||||||
|
+ /* Half a match? This means a partial retransmisison.
|
||||||
|
+ It's a cracker being funky. */
|
||||||
|
+ if (net_ratelimit()) {
|
||||||
|
+ printk("ip_nat_mms: partial packet %u/%u in %u/%u\n",
|
||||||
|
+ exp->seq, ct_mms_info->len,
|
||||||
|
+ ntohl(tcph->seq),
|
||||||
|
+ ntohl(tcph->seq) + datalen);
|
||||||
|
+ }
|
||||||
|
+ UNLOCK_BH(&ip_mms_lock);
|
||||||
|
+ return NF_DROP;
|
||||||
|
+ }
|
||||||
|
+ UNLOCK_BH(&ip_mms_lock);
|
||||||
|
+
|
||||||
|
+ return NF_ACCEPT;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static struct ip_nat_helper mms[MAX_PORTS];
|
||||||
|
+static char mms_names[MAX_PORTS][10];
|
||||||
|
+
|
||||||
|
+/* Not __exit: called from init() */
|
||||||
|
+static void fini(void)
|
||||||
|
+{
|
||||||
|
+ int i;
|
||||||
|
+
|
||||||
|
+ for (i = 0; (i < MAX_PORTS) && ports[i]; i++) {
|
||||||
|
+ DEBUGP("ip_nat_mms: unregistering helper for port %d\n", ports[i]);
|
||||||
|
+ ip_nat_helper_unregister(&mms[i]);
|
||||||
|
+ }
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static int __init init(void)
|
||||||
|
+{
|
||||||
|
+ int i, ret = 0;
|
||||||
|
+ char *tmpname;
|
||||||
|
+
|
||||||
|
+ if (ports[0] == 0)
|
||||||
|
+ ports[0] = MMS_PORT;
|
||||||
|
+
|
||||||
|
+ for (i = 0; (i < MAX_PORTS) && ports[i]; i++) {
|
||||||
|
+
|
||||||
|
+ memset(&mms[i], 0, sizeof(struct ip_nat_helper));
|
||||||
|
+
|
||||||
|
+ mms[i].tuple.dst.protonum = IPPROTO_TCP;
|
||||||
|
+ mms[i].tuple.src.u.tcp.port = htons(ports[i]);
|
||||||
|
+ mms[i].mask.dst.protonum = 0xFFFF;
|
||||||
|
+ mms[i].mask.src.u.tcp.port = 0xFFFF;
|
||||||
|
+ mms[i].help = mms_nat_help;
|
||||||
|
+ mms[i].me = THIS_MODULE;
|
||||||
|
+ mms[i].flags = 0;
|
||||||
|
+ mms[i].expect = mms_nat_expected;
|
||||||
|
+
|
||||||
|
+ tmpname = &mms_names[i][0];
|
||||||
|
+ if (ports[i] == MMS_PORT)
|
||||||
|
+ sprintf(tmpname, "mms");
|
||||||
|
+ else
|
||||||
|
+ sprintf(tmpname, "mms-%d", i);
|
||||||
|
+ mms[i].name = tmpname;
|
||||||
|
+
|
||||||
|
+ DEBUGP("ip_nat_mms: register helper for port %d\n",
|
||||||
|
+ ports[i]);
|
||||||
|
+ ret = ip_nat_helper_register(&mms[i]);
|
||||||
|
+
|
||||||
|
+ if (ret) {
|
||||||
|
+ printk("ip_nat_mms: error registering "
|
||||||
|
+ "helper for port %d\n", ports[i]);
|
||||||
|
+ fini();
|
||||||
|
+ return ret;
|
||||||
|
+ }
|
||||||
|
+ ports_c++;
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ return ret;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+module_init(init);
|
||||||
|
+module_exit(fini);
|
||||||
|
diff -urN linux-2.4.32/include/linux/netfilter_ipv4/ip_conntrack.h linux-2.4.32/include/linux/netfilter_ipv4/ip_conntrack.h
|
||||||
|
--- linux-2.4.32/include/linux/netfilter_ipv4/ip_conntrack.h 2005-12-12 16:29:01.000000000 +0100
|
||||||
|
+++ linux-2.4.32/include/linux/netfilter_ipv4/ip_conntrack.h 2005-12-12 16:34:09.000000000 +0100
|
||||||
|
@@ -73,6 +73,7 @@
|
||||||
|
#include <linux/netfilter_ipv4/ip_conntrack_pptp.h>
|
||||||
|
#include <linux/netfilter_ipv4/ip_conntrack_sip.h>
|
||||||
|
#include <linux/netfilter_ipv4/ip_conntrack_h323.h>
|
||||||
|
+#include <linux/netfilter_ipv4/ip_conntrack_mms.h>
|
||||||
|
|
||||||
|
/* per expectation: application helper private data */
|
||||||
|
union ip_conntrack_expect_help {
|
||||||
|
@@ -83,6 +84,7 @@
|
||||||
|
struct ip_ct_pptp_expect exp_pptp_info;
|
||||||
|
struct ip_ct_sip_expect exp_sip_info;
|
||||||
|
struct ip_ct_h225_expect exp_h225_info;
|
||||||
|
+ struct ip_ct_mms_expect exp_mms_info;
|
||||||
|
|
||||||
|
#ifdef CONFIG_IP_NF_NAT_NEEDED
|
||||||
|
union {
|
||||||
|
@@ -99,6 +101,7 @@
|
||||||
|
struct ip_ct_pptp_master ct_pptp_info;
|
||||||
|
struct ip_ct_sip_master ct_sip_info;
|
||||||
|
struct ip_ct_h225_master ct_h225_info;
|
||||||
|
+ struct ip_ct_mms_master ct_mms_info;
|
||||||
|
};
|
||||||
|
|
||||||
|
#ifdef CONFIG_IP_NF_NAT_NEEDED
|
||||||
|
diff -urN linux-2.4.32/include/linux/netfilter_ipv4/ip_conntrack_mms.h linux-2.4.32/include/linux/netfilter_ipv4/ip_conntrack_mms.h
|
||||||
|
--- linux-2.4.32/include/linux/netfilter_ipv4/ip_conntrack_mms.h 1970-01-01 01:00:00.000000000 +0100
|
||||||
|
+++ linux-2.4.32/include/linux/netfilter_ipv4/ip_conntrack_mms.h 2005-12-12 16:32:54.000000000 +0100
|
||||||
|
@@ -0,0 +1,31 @@
|
||||||
|
+#ifndef _IP_CONNTRACK_MMS_H
|
||||||
|
+#define _IP_CONNTRACK_MMS_H
|
||||||
|
+/* MMS tracking. */
|
||||||
|
+
|
||||||
|
+#ifdef __KERNEL__
|
||||||
|
+#include <linux/netfilter_ipv4/lockhelp.h>
|
||||||
|
+
|
||||||
|
+DECLARE_LOCK_EXTERN(ip_mms_lock);
|
||||||
|
+
|
||||||
|
+#define MMS_PORT 1755
|
||||||
|
+#define MMS_SRV_MSG_ID 196610
|
||||||
|
+
|
||||||
|
+#define MMS_SRV_MSG_OFFSET 36
|
||||||
|
+#define MMS_SRV_UNICODE_STRING_OFFSET 60
|
||||||
|
+#define MMS_SRV_CHUNKLENLV_OFFSET 16
|
||||||
|
+#define MMS_SRV_CHUNKLENLM_OFFSET 32
|
||||||
|
+#define MMS_SRV_MESSAGELENGTH_OFFSET 8
|
||||||
|
+#endif
|
||||||
|
+
|
||||||
|
+/* This structure is per expected connection */
|
||||||
|
+struct ip_ct_mms_expect {
|
||||||
|
+ u_int32_t len;
|
||||||
|
+ u_int32_t padding;
|
||||||
|
+ u_int16_t port;
|
||||||
|
+};
|
||||||
|
+
|
||||||
|
+/* This structure exists only once per master */
|
||||||
|
+struct ip_ct_mms_master {
|
||||||
|
+};
|
||||||
|
+
|
||||||
|
+#endif /* _IP_CONNTRACK_MMS_H */
|
||||||
@ -1,5 +1,6 @@
|
|||||||
source "target/linux/package/alsa/Config.in"
|
source "target/linux/package/alsa/Config.in"
|
||||||
source "target/linux/package/diag/Config.in"
|
source "target/linux/package/diag/Config.in"
|
||||||
|
source "target/linux/package/eagle-usb/Config.in"
|
||||||
source "target/linux/package/fuse/Config.in"
|
source "target/linux/package/fuse/Config.in"
|
||||||
source "target/linux/package/hostap/Config.in"
|
source "target/linux/package/hostap/Config.in"
|
||||||
source "target/linux/package/madwifi/Config.in"
|
source "target/linux/package/madwifi/Config.in"
|
||||||
|
|||||||
Loading…
Reference in New Issue
Block a user