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Added support for MMS connection tracking 

git-svn-id: svn://svn.openwrt.org/openwrt/trunk/openwrt@2640 3c298f89-4303-0410-b956-a3cf2f4a3e73
master
Florian Fainelli 2005-12-12 15:59:31 +00:00
parent 123fcd69c5
commit 143520d71b
3 changed files with 742 additions and 0 deletions
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2
target/linux/linux-2.4/config/brcm
View File

@ -364,6 +364,7 @@ CONFIG_IP_NF_CT_PROTO_GRE=m
CONFIG_IP_NF_PPTP=m
CONFIG_IP_NF_SIP=m
CONFIG_IP_NF_H323=m
CONFIG_IP_NF_MMS=m
CONFIG_IP_NF_QUEUE=m
CONFIG_IP_NF_IPTABLES=y
CONFIG_IP_NF_MATCH_LIMIT=m
@ -414,6 +415,7 @@ CONFIG_IP_NF_TARGET_NETMAP=m
CONFIG_IP_NF_NAT_PPTP=m
CONFIG_IP_NF_NAT_SIP=m
CONFIG_IP_NF_NAT_H323=m
CONFIG_IP_NF_NAT_MMS=m
CONFIG_IP_NF_NAT_PROTO_GRE=m
CONFIG_IP_NF_NAT_AMANDA=m
CONFIG_IP_NF_NAT_SNMP_BASIC=m

739
target/linux/linux-2.4/patches/generic/615-netfilter_nat_mms.patch Normal file
View File

@ -0,0 +1,739 @@
diff -urN linux-2.4.32/net/ipv4/netfilter/Config.in linux-2.4.32/net/ipv4/netfilter/Config.in
--- linux-2.4.32/net/ipv4/netfilter/Config.in 2005-12-12 16:29:01.000000000 +0100
+++ linux-2.4.32/net/ipv4/netfilter/Config.in 2005-12-12 16:35:37.000000000 +0100
@@ -17,6 +17,7 @@
dep_tristate ' PPTP protocol support' CONFIG_IP_NF_PPTP $CONFIG_IP_NF_CT_PROTO_GRE
dep_tristate ' SIP protocol support' CONFIG_IP_NF_SIP $CONFIG_IP_NF_CONNTRACK
dep_tristate ' H.323 (netmeeting) support' CONFIG_IP_NF_H323 $CONFIG_IP_NF_CONNTRACK
+ dep_tristate ' MMS protocol support' CONFIG_IP_NF_MMS $CONFIG_IP_NF_CONNTRACK
fi
if [ "$CONFIG_EXPERIMENTAL" = "y" ]; then
@@ -120,6 +121,13 @@
define_tristate CONFIG_IP_NF_NAT_H323 $CONFIG_IP_NF_NAT
fi
fi
+ if [ "$CONFIG_IP_NF_MMS" = "m" ]; then
+ define_tristate CONFIG_IP_NF_NAT_MMS m
+ else
+ if [ "$CONFIG_IP_NF_MMS" = "y" ]; then
+ define_tristate CONFIG_IP_NF_NAT_MMS $CONFIG_IP_NF_NAT
+ fi
+ fi
if [ "$CONFIG_IP_NF_AMANDA" = "m" ]; then
define_tristate CONFIG_IP_NF_NAT_AMANDA m
else
diff -urN linux-2.4.32/net/ipv4/netfilter/Makefile linux-2.4.32/net/ipv4/netfilter/Makefile
--- linux-2.4.32/net/ipv4/netfilter/Makefile 2005-12-12 16:29:01.000000000 +0100
+++ linux-2.4.32/net/ipv4/netfilter/Makefile 2005-12-12 16:36:26.000000000 +0100
@@ -61,6 +61,10 @@
ifdef CONFIG_IP_NF_NAT_H323
export-objs += ip_conntrack_h323.o
endif
+obj-$(CONFIG_IP_NF_MMS) += ip_conntrack_mms.o
+ifdef CONFIG_IP_NF_NAT_MMS
+ export-objs += ip_conntrack_mms.o
+endif
# NAT helpers
@@ -72,6 +76,7 @@
obj-$(CONFIG_IP_NF_NAT_PPTP) += ip_nat_pptp.o
obj-$(CONFIG_IP_NF_NAT_SIP) += ip_nat_sip.o
obj-$(CONFIG_IP_NF_NAT_H323) += ip_nat_h323.o
+obj-$(CONFIG_IP_NF_NAT_MMS) += ip_nat_mms.o
# generic IP tables
obj-$(CONFIG_IP_NF_IPTABLES) += ip_tables.o
diff -urN linux-2.4.32/net/ipv4/netfilter/ip_conntrack_mms.c linux-2.4.32/net/ipv4/netfilter/ip_conntrack_mms.c
--- linux-2.4.32/net/ipv4/netfilter/ip_conntrack_mms.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.4.32/net/ipv4/netfilter/ip_conntrack_mms.c 2005-12-12 16:32:54.000000000 +0100
@@ -0,0 +1,292 @@
+/* MMS extension for IP connection tracking
+ * (C) 2002 by Filip Sneppe <filip.sneppe@cronos.be>
+ * based on ip_conntrack_ftp.c and ip_conntrack_irc.c
+ *
+ * ip_conntrack_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_conntrack_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/config.h>
+#include <linux/module.h>
+#include <linux/netfilter.h>
+#include <linux/ip.h>
+#include <linux/ctype.h>
+#include <net/checksum.h>
+#include <net/tcp.h>
+
+#include <linux/netfilter_ipv4/lockhelp.h>
+#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
+#include <linux/netfilter_ipv4/ip_conntrack_mms.h>
+
+DECLARE_LOCK(ip_mms_lock);
+struct module *ip_conntrack_mms = THIS_MODULE;
+
+#define MAX_PORTS 8
+static int ports[MAX_PORTS];
+static int ports_c;
+#ifdef MODULE_PARM
+MODULE_PARM(ports, "1-" __MODULE_STRING(MAX_PORTS) "i");
+#endif
+
+#define DEBUGP(format, args...)
+
+#ifdef CONFIG_IP_NF_NAT_NEEDED
+EXPORT_SYMBOL(ip_mms_lock);
+#endif
+
+MODULE_AUTHOR("Filip Sneppe <filip.sneppe@cronos.be>");
+MODULE_DESCRIPTION("Microsoft Windows Media Services (MMS) connection tracking module");
+MODULE_LICENSE("GPL");
+
+/* #define isdigit(c) (c >= '0' && c <= '9') */
+
+/* copied from drivers/usb/serial/io_edgeport.c - not perfect but will do the trick */
+static void unicode_to_ascii (char *string, short *unicode, int unicode_size)
+{
+ int i;
+ for (i = 0; i < unicode_size; ++i) {
+ string[i] = (char)(unicode[i]);
+ }
+ string[unicode_size] = 0x00;
+}
+
+__inline static int atoi(char *s)
+{
+ int i=0;
+ while (isdigit(*s)) {
+ i = i*10 + *(s++) - '0';
+ }
+ return i;
+}
+
+/* convert ip address string like "192.168.0.10" to unsigned int */
+__inline static u_int32_t asciiiptoi(char *s)
+{
+ unsigned int i, j, k;
+
+ for(i=k=0; k<3; ++k, ++s, i<<=8) {
+ i+=atoi(s);
+ for(j=0; (*(++s) != '.') && (j<3); ++j)
+ ;
+ }
+ i+=atoi(s);
+ return ntohl(i);
+}
+
+int parse_mms(const char *data,
+ const unsigned int datalen,
+ u_int32_t *mms_ip,
+ u_int16_t *mms_proto,
+ u_int16_t *mms_port,
+ char **mms_string_b,
+ char **mms_string_e,
+ char **mms_padding_e)
+{
+ int unicode_size, i;
+ char tempstring[28]; /* "\\255.255.255.255\UDP\65535" */
+ char getlengthstring[28];
+
+ for(unicode_size=0;
+ (char) *(data+(MMS_SRV_UNICODE_STRING_OFFSET+unicode_size*2)) != (char)0;
+ unicode_size++)
+ if ((unicode_size == 28) || (MMS_SRV_UNICODE_STRING_OFFSET+unicode_size*2 >= datalen))
+ return -1; /* out of bounds - incomplete packet */
+
+ unicode_to_ascii(tempstring, (short *)(data+MMS_SRV_UNICODE_STRING_OFFSET), unicode_size);
+ DEBUGP("ip_conntrack_mms: offset 60: %s\n", (const char *)(tempstring));
+
+ /* IP address ? */
+ *mms_ip = asciiiptoi(tempstring+2);
+
+ i=sprintf(getlengthstring, "%u.%u.%u.%u", HIPQUAD(*mms_ip));
+
+ /* protocol ? */
+ if(strncmp(tempstring+3+i, "TCP", 3)==0)
+ *mms_proto = IPPROTO_TCP;
+ else if(strncmp(tempstring+3+i, "UDP", 3)==0)
+ *mms_proto = IPPROTO_UDP;
+
+ /* port ? */
+ *mms_port = atoi(tempstring+7+i);
+
+ /* we store a pointer to the beginning of the "\\a.b.c.d\proto\port"
+ unicode string, one to the end of the string, and one to the end
+ of the packet, since we must keep track of the number of bytes
+ between end of the unicode string and the end of packet (padding) */
+ *mms_string_b = (char *)(data + MMS_SRV_UNICODE_STRING_OFFSET);
+ *mms_string_e = (char *)(data + MMS_SRV_UNICODE_STRING_OFFSET + unicode_size * 2);
+ *mms_padding_e = (char *)(data + datalen); /* looks funny, doesn't it */
+ return 0;
+}
+
+
+static int help(const struct iphdr *iph, size_t len,
+ struct ip_conntrack *ct,
+ enum ip_conntrack_info ctinfo)
+{
+ /* tcplen not negative guaranteed by ip_conntrack_tcp.c */
+ struct tcphdr *tcph = (void *)iph + iph->ihl * 4;
+ const char *data = (const char *)tcph + tcph->doff * 4;
+ unsigned int tcplen = len - iph->ihl * 4;
+ unsigned int datalen = tcplen - tcph->doff * 4;
+ int dir = CTINFO2DIR(ctinfo);
+ struct ip_conntrack_expect expect, *exp = &expect;
+ struct ip_ct_mms_expect *exp_mms_info = &exp->help.exp_mms_info;
+
+ u_int32_t mms_ip;
+ u_int16_t mms_proto;
+ char mms_proto_string[8];
+ u_int16_t mms_port;
+ char *mms_string_b, *mms_string_e, *mms_padding_e;
+
+ /* Until there's been traffic both ways, don't look in packets. */
+ if (ctinfo != IP_CT_ESTABLISHED
+ && ctinfo != IP_CT_ESTABLISHED+IP_CT_IS_REPLY) {
+ DEBUGP("ip_conntrack_mms: Conntrackinfo = %u\n", ctinfo);
+ return NF_ACCEPT;
+ }
+
+ /* Not whole TCP header? */
+ if (tcplen < sizeof(struct tcphdr) || tcplen < tcph->doff*4) {
+ DEBUGP("ip_conntrack_mms: tcplen = %u\n", (unsigned)tcplen);
+ return NF_ACCEPT;
+ }
+
+ /* Checksum invalid? Ignore. */
+ if (tcp_v4_check(tcph, tcplen, iph->saddr, iph->daddr,
+ csum_partial((char *)tcph, tcplen, 0))) {
+ DEBUGP("mms_help: bad csum: %p %u %u.%u.%u.%u %u.%u.%u.%u\n",
+ tcph, tcplen, NIPQUAD(iph->saddr),
+ NIPQUAD(iph->daddr));
+ return NF_ACCEPT;
+ }
+
+ /* Only look at packets with 0x00030002/196610 on bytes 36->39 of TCP payload */
+ if( (MMS_SRV_MSG_OFFSET < datalen) &&
+ ((*(u32 *)(data+MMS_SRV_MSG_OFFSET)) == MMS_SRV_MSG_ID)) {
+ DEBUGP("ip_conntrack_mms: offset 37: %u %u %u %u, datalen:%u\n",
+ (u8)*(data+36), (u8)*(data+37),
+ (u8)*(data+38), (u8)*(data+39),
+ datalen);
+ if(parse_mms(data, datalen, &mms_ip, &mms_proto, &mms_port,
+ &mms_string_b, &mms_string_e, &mms_padding_e))
+ if(net_ratelimit())
+ printk(KERN_WARNING
+ "ip_conntrack_mms: Unable to parse data payload\n");
+
+ memset(&expect, 0, sizeof(expect));
+
+ sprintf(mms_proto_string, "(%u)", mms_proto);
+ DEBUGP("ip_conntrack_mms: adding %s expectation %u.%u.%u.%u -> %u.%u.%u.%u:%u\n",
+ mms_proto == IPPROTO_TCP ? "TCP"
+ : mms_proto == IPPROTO_UDP ? "UDP":mms_proto_string,
+ NIPQUAD(ct->tuplehash[!dir].tuple.src.ip),
+ NIPQUAD(mms_ip),
+ mms_port);
+
+ /* it's possible that the client will just ask the server to tunnel
+ the stream over the same TCP session (from port 1755): there's
+ shouldn't be a need to add an expectation in that case, but it
+ makes NAT packet mangling so much easier */
+ LOCK_BH(&ip_mms_lock);
+
+ DEBUGP("ip_conntrack_mms: tcph->seq = %u\n", tcph->seq);
+
+ exp->seq = ntohl(tcph->seq) + (mms_string_b - data);
+ exp_mms_info->len = (mms_string_e - mms_string_b);
+ exp_mms_info->padding = (mms_padding_e - mms_string_e);
+ exp_mms_info->port = mms_port;
+
+ DEBUGP("ip_conntrack_mms: wrote info seq=%u (ofs=%u), len=%d, padding=%u\n",
+ exp->seq, (mms_string_e - data), exp_mms_info->len, exp_mms_info->padding);
+
+ exp->tuple = ((struct ip_conntrack_tuple)
+ { { ct->tuplehash[!dir].tuple.src.ip, { 0 } },
+ { mms_ip,
+ { (__u16) ntohs(mms_port) },
+ mms_proto } }
+ );
+ exp->mask = ((struct ip_conntrack_tuple)
+ { { 0xFFFFFFFF, { 0 } },
+ { 0xFFFFFFFF, { 0xFFFF }, 0xFFFF }});
+ exp->expectfn = NULL;
+ ip_conntrack_expect_related(ct, &expect);
+ 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
target/linux/package/Config.in
View File

@ -1,5 +1,6 @@
source "target/linux/package/alsa/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/hostap/Config.in"
source "target/linux/package/madwifi/Config.in"