[NETFILTER]: nf_conntrack/nf_nat: add H.323 helper port
Add IPv4 and IPv6 capable nf_conntrack port of the H.323 conntrack/NAT helper. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy
David S. Miller
parent
1695890057
commit
f587de0e2f
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@ -0,0 +1,92 @@
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#ifndef _NF_CONNTRACK_H323_H
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#define _NF_CONNTRACK_H323_H
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#ifdef __KERNEL__
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#include <linux/netfilter/nf_conntrack_h323_asn1.h>
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#define RAS_PORT 1719
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#define Q931_PORT 1720
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#define H323_RTP_CHANNEL_MAX 4 /* Audio, video, FAX and other */
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/* This structure exists only once per master */
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struct nf_ct_h323_master {
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/* Original and NATed Q.931 or H.245 signal ports */
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__be16 sig_port[IP_CT_DIR_MAX];
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/* Original and NATed RTP ports */
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__be16 rtp_port[H323_RTP_CHANNEL_MAX][IP_CT_DIR_MAX];
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union {
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/* RAS connection timeout */
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u_int32_t timeout;
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/* Next TPKT length (for separate TPKT header and data) */
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u_int16_t tpkt_len[IP_CT_DIR_MAX];
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};
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};
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struct nf_conn;
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extern int get_h225_addr(struct nf_conn *ct, unsigned char *data,
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TransportAddress *taddr,
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union nf_conntrack_address *addr, __be16 *port);
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extern void nf_conntrack_h245_expect(struct nf_conn *new,
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struct nf_conntrack_expect *this);
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extern void nf_conntrack_q931_expect(struct nf_conn *new,
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struct nf_conntrack_expect *this);
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extern int (*set_h245_addr_hook) (struct sk_buff **pskb,
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unsigned char **data, int dataoff,
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H245_TransportAddress *taddr,
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union nf_conntrack_address *addr,
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__be16 port);
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extern int (*set_h225_addr_hook) (struct sk_buff **pskb,
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unsigned char **data, int dataoff,
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TransportAddress *taddr,
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union nf_conntrack_address *addr,
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__be16 port);
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extern int (*set_sig_addr_hook) (struct sk_buff **pskb,
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struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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unsigned char **data,
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TransportAddress *taddr, int count);
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extern int (*set_ras_addr_hook) (struct sk_buff **pskb,
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struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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unsigned char **data,
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TransportAddress *taddr, int count);
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extern int (*nat_rtp_rtcp_hook) (struct sk_buff **pskb,
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struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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unsigned char **data, int dataoff,
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H245_TransportAddress *taddr,
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__be16 port, __be16 rtp_port,
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struct nf_conntrack_expect *rtp_exp,
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struct nf_conntrack_expect *rtcp_exp);
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extern int (*nat_t120_hook) (struct sk_buff **pskb, struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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unsigned char **data, int dataoff,
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H245_TransportAddress *taddr, __be16 port,
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struct nf_conntrack_expect *exp);
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extern int (*nat_h245_hook) (struct sk_buff **pskb, struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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unsigned char **data, int dataoff,
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TransportAddress *taddr, __be16 port,
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struct nf_conntrack_expect *exp);
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extern int (*nat_callforwarding_hook) (struct sk_buff **pskb,
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struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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unsigned char **data, int dataoff,
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TransportAddress *taddr,
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__be16 port,
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struct nf_conntrack_expect *exp);
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extern int (*nat_q931_hook) (struct sk_buff **pskb, struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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unsigned char **data, TransportAddress *taddr,
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int idx, __be16 port,
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struct nf_conntrack_expect *exp);
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#endif
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#endif
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@ -1,6 +1,6 @@
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/****************************************************************************
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* ip_conntrack_helper_h323_asn1.h - BER and PER decoding library for H.323
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* conntrack/NAT module.
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* ip_conntrack_h323_asn1.h - BER and PER decoding library for H.323
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* conntrack/NAT module.
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*
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* Copyright (c) 2006 by Jing Min Zhao <zhaojingmin@users.sourceforge.net>
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*
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@ -34,13 +34,13 @@
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*
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****************************************************************************/
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#ifndef _IP_CONNTRACK_HELPER_H323_ASN1_H_
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#define _IP_CONNTRACK_HELPER_H323_ASN1_H_
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#ifndef _NF_CONNTRACK_HELPER_H323_ASN1_H_
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#define _NF_CONNTRACK_HELPER_H323_ASN1_H_
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/*****************************************************************************
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* H.323 Types
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****************************************************************************/
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#include "ip_conntrack_helper_h323_types.h"
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#include "nf_conntrack_h323_types.h"
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typedef struct {
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enum {
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@ -10,6 +10,11 @@ typedef struct TransportAddress_ipAddress { /* SEQUENCE */
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unsigned ip;
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} TransportAddress_ipAddress;
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typedef struct TransportAddress_ip6Address { /* SEQUENCE */
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int options; /* No use */
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unsigned ip6;
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} TransportAddress_ip6Address;
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typedef struct TransportAddress { /* CHOICE */
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enum {
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eTransportAddress_ipAddress,
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@ -22,6 +27,7 @@ typedef struct TransportAddress { /* CHOICE */
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} choice;
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union {
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TransportAddress_ipAddress ipAddress;
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TransportAddress_ip6Address ip6Address;
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};
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} TransportAddress;
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@ -93,6 +99,11 @@ typedef struct UnicastAddress_iPAddress { /* SEQUENCE */
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unsigned network;
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} UnicastAddress_iPAddress;
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typedef struct UnicastAddress_iP6Address { /* SEQUENCE */
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int options; /* No use */
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unsigned network;
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} UnicastAddress_iP6Address;
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typedef struct UnicastAddress { /* CHOICE */
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enum {
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eUnicastAddress_iPAddress,
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@ -105,6 +116,7 @@ typedef struct UnicastAddress { /* CHOICE */
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} choice;
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union {
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UnicastAddress_iPAddress iPAddress;
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UnicastAddress_iP6Address iP6Address;
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};
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} UnicastAddress;
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@ -1,6 +1,4 @@
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header-y += ip_conntrack_helper.h
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header-y += ip_conntrack_helper_h323_asn1.h
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header-y += ip_conntrack_helper_h323_types.h
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header-y += ip_conntrack_protocol.h
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header-y += ip_conntrack_sctp.h
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header-y += ip_conntrack_tcp.h
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@ -3,7 +3,7 @@
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#ifdef __KERNEL__
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#include <linux/netfilter_ipv4/ip_conntrack_helper_h323_asn1.h>
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#include <linux/netfilter/nf_conntrack_h323_asn1.h>
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#define RAS_PORT 1719
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#define Q931_PORT 1720
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@ -41,11 +41,13 @@ union nf_conntrack_expect_proto {
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/* Add protocol helper include file here */
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#include <linux/netfilter/nf_conntrack_ftp.h>
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#include <linux/netfilter/nf_conntrack_h323.h>
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/* per conntrack: application helper private data */
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union nf_conntrack_help {
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/* insert conntrack helper private data (master) here */
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struct nf_ct_ftp_master ct_ftp_info;
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struct nf_ct_h323_master ct_h323_info;
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};
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#include <linux/types.h>
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@ -41,6 +41,7 @@ struct nf_conntrack_expect
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unsigned int flags;
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#ifdef CONFIG_NF_NAT_NEEDED
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__be32 saved_ip;
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/* This is the original per-proto part, used to map the
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* expected connection the way the recipient expects. */
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union nf_conntrack_man_proto saved_proto;
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@ -529,6 +529,11 @@ config IP_NF_NAT_H323
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default IP_NF_NAT if IP_NF_H323=y
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default m if IP_NF_H323=m
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config NF_NAT_H323
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tristate
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depends on IP_NF_IPTABLES && NF_CONNTRACK && NF_NAT
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default NF_NAT && NF_CONNTRACK_H323
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config IP_NF_NAT_SIP
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tristate
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depends on IP_NF_IPTABLES!=n && IP_NF_CONNTRACK!=n && IP_NF_NAT!=n
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@ -15,7 +15,7 @@ endif
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ip_conntrack_pptp-objs := ip_conntrack_helper_pptp.o ip_conntrack_proto_gre.o
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ip_nat_pptp-objs := ip_nat_helper_pptp.o ip_nat_proto_gre.o
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ip_conntrack_h323-objs := ip_conntrack_helper_h323.o ip_conntrack_helper_h323_asn1.o
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ip_conntrack_h323-objs := ip_conntrack_helper_h323.o ../../netfilter/nf_conntrack_h323_asn1.o
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ip_nat_h323-objs := ip_nat_helper_h323.o
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# connection tracking
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@ -52,6 +52,7 @@ obj-$(CONFIG_IP_NF_NAT_SIP) += ip_nat_sip.o
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# NAT helpers (nf_conntrack)
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obj-$(CONFIG_NF_NAT_AMANDA) += nf_nat_amanda.o
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obj-$(CONFIG_NF_NAT_FTP) += nf_nat_ftp.o
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obj-$(CONFIG_NF_NAT_H323) += nf_nat_h323.o
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# generic IP tables
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obj-$(CONFIG_IP_NF_IPTABLES) += ip_tables.o
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@ -0,0 +1,596 @@
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/*
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* H.323 extension for NAT alteration.
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*
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* Copyright (c) 2006 Jing Min Zhao <zhaojingmin@users.sourceforge.net>
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*
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* This source code is licensed under General Public License version 2.
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*
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* Based on the 'brute force' H.323 NAT module by
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* Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/tcp.h>
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#include <net/tcp.h>
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#include <net/netfilter/nf_nat.h>
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#include <net/netfilter/nf_nat_helper.h>
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#include <net/netfilter/nf_nat_rule.h>
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#include <net/netfilter/nf_conntrack_helper.h>
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#include <net/netfilter/nf_conntrack_expect.h>
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#include <linux/netfilter/nf_conntrack_h323.h>
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#if 0
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#define DEBUGP printk
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#else
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#define DEBUGP(format, args...)
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#endif
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/****************************************************************************/
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static int set_addr(struct sk_buff **pskb,
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unsigned char **data, int dataoff,
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unsigned int addroff, __be32 ip, __be16 port)
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{
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enum ip_conntrack_info ctinfo;
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struct nf_conn *ct = ip_conntrack_get(*pskb, &ctinfo);
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struct {
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__be32 ip;
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__be16 port;
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} __attribute__ ((__packed__)) buf;
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struct tcphdr _tcph, *th;
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buf.ip = ip;
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buf.port = port;
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addroff += dataoff;
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if ((*pskb)->nh.iph->protocol == IPPROTO_TCP) {
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if (!nf_nat_mangle_tcp_packet(pskb, ct, ctinfo,
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addroff, sizeof(buf),
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(char *) &buf, sizeof(buf))) {
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if (net_ratelimit())
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printk("nf_nat_h323: nf_nat_mangle_tcp_packet"
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" error\n");
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return -1;
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}
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/* Relocate data pointer */
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th = skb_header_pointer(*pskb, (*pskb)->nh.iph->ihl * 4,
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sizeof(_tcph), &_tcph);
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if (th == NULL)
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return -1;
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*data = (*pskb)->data + (*pskb)->nh.iph->ihl * 4 +
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th->doff * 4 + dataoff;
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} else {
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if (!nf_nat_mangle_udp_packet(pskb, ct, ctinfo,
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addroff, sizeof(buf),
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(char *) &buf, sizeof(buf))) {
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if (net_ratelimit())
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printk("nf_nat_h323: nf_nat_mangle_udp_packet"
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" error\n");
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return -1;
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}
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/* nf_nat_mangle_udp_packet uses skb_make_writable() to copy
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* or pull everything in a linear buffer, so we can safely
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* use the skb pointers now */
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*data = (*pskb)->data + (*pskb)->nh.iph->ihl * 4 +
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sizeof(struct udphdr);
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}
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return 0;
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}
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/****************************************************************************/
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static int set_h225_addr(struct sk_buff **pskb,
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unsigned char **data, int dataoff,
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TransportAddress *taddr,
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union nf_conntrack_address *addr, __be16 port)
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{
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return set_addr(pskb, data, dataoff, taddr->ipAddress.ip,
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addr->ip, port);
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}
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/****************************************************************************/
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static int set_h245_addr(struct sk_buff **pskb,
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unsigned char **data, int dataoff,
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H245_TransportAddress *taddr,
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union nf_conntrack_address *addr, __be16 port)
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{
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return set_addr(pskb, data, dataoff,
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taddr->unicastAddress.iPAddress.network,
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addr->ip, port);
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}
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/****************************************************************************/
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static int set_sig_addr(struct sk_buff **pskb, struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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unsigned char **data,
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TransportAddress *taddr, int count)
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{
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struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
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int dir = CTINFO2DIR(ctinfo);
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int i;
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__be16 port;
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union nf_conntrack_address addr;
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for (i = 0; i < count; i++) {
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if (get_h225_addr(ct, *data, &taddr[i], &addr, &port)) {
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if (addr.ip == ct->tuplehash[dir].tuple.src.u3.ip &&
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port == info->sig_port[dir]) {
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/* GW->GK */
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/* Fix for Gnomemeeting */
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if (i > 0 &&
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get_h225_addr(ct, *data, &taddr[0],
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&addr, &port) &&
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(ntohl(addr.ip) & 0xff000000) == 0x7f000000)
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i = 0;
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DEBUGP
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("nf_nat_ras: set signal address "
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"%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
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NIPQUAD(ip), port,
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NIPQUAD(ct->tuplehash[!dir].tuple.dst.
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ip), info->sig_port[!dir]);
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return set_h225_addr(pskb, data, 0, &taddr[i],
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&ct->tuplehash[!dir].
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tuple.dst.u3,
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info->sig_port[!dir]);
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} else if (addr.ip == ct->tuplehash[dir].tuple.dst.u3.ip &&
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port == info->sig_port[dir]) {
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/* GK->GW */
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DEBUGP
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("nf_nat_ras: set signal address "
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"%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
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NIPQUAD(ip), port,
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NIPQUAD(ct->tuplehash[!dir].tuple.src.
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ip), info->sig_port[!dir]);
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return set_h225_addr(pskb, data, 0, &taddr[i],
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&ct->tuplehash[!dir].
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tuple.src.u3,
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info->sig_port[!dir]);
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}
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}
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}
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return 0;
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}
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/****************************************************************************/
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static int set_ras_addr(struct sk_buff **pskb, struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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unsigned char **data,
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TransportAddress *taddr, int count)
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{
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int dir = CTINFO2DIR(ctinfo);
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int i;
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__be16 port;
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union nf_conntrack_address addr;
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for (i = 0; i < count; i++) {
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if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) &&
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addr.ip == ct->tuplehash[dir].tuple.src.u3.ip &&
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port == ct->tuplehash[dir].tuple.src.u.udp.port) {
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DEBUGP("nf_nat_ras: set rasAddress "
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"%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
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NIPQUAD(ip), ntohs(port),
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NIPQUAD(ct->tuplehash[!dir].tuple.dst.u3.ip),
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ntohs(ct->tuplehash[!dir].tuple.dst.u.udp.
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port));
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return set_h225_addr(pskb, data, 0, &taddr[i],
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&ct->tuplehash[!dir].tuple.dst.u3,
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ct->tuplehash[!dir].tuple.
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dst.u.udp.port);
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}
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}
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return 0;
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}
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/****************************************************************************/
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static int nat_rtp_rtcp(struct sk_buff **pskb, struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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unsigned char **data, int dataoff,
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H245_TransportAddress *taddr,
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__be16 port, __be16 rtp_port,
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struct nf_conntrack_expect *rtp_exp,
|
||||
struct nf_conntrack_expect *rtcp_exp)
|
||||
{
|
||||
struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
|
||||
int dir = CTINFO2DIR(ctinfo);
|
||||
int i;
|
||||
u_int16_t nated_port;
|
||||
|
||||
/* Set expectations for NAT */
|
||||
rtp_exp->saved_proto.udp.port = rtp_exp->tuple.dst.u.udp.port;
|
||||
rtp_exp->expectfn = nf_nat_follow_master;
|
||||
rtp_exp->dir = !dir;
|
||||
rtcp_exp->saved_proto.udp.port = rtcp_exp->tuple.dst.u.udp.port;
|
||||
rtcp_exp->expectfn = nf_nat_follow_master;
|
||||
rtcp_exp->dir = !dir;
|
||||
|
||||
/* Lookup existing expects */
|
||||
for (i = 0; i < H323_RTP_CHANNEL_MAX; i++) {
|
||||
if (info->rtp_port[i][dir] == rtp_port) {
|
||||
/* Expected */
|
||||
|
||||
/* Use allocated ports first. This will refresh
|
||||
* the expects */
|
||||
rtp_exp->tuple.dst.u.udp.port = info->rtp_port[i][dir];
|
||||
rtcp_exp->tuple.dst.u.udp.port =
|
||||
htons(ntohs(info->rtp_port[i][dir]) + 1);
|
||||
break;
|
||||
} else if (info->rtp_port[i][dir] == 0) {
|
||||
/* Not expected */
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
/* Run out of expectations */
|
||||
if (i >= H323_RTP_CHANNEL_MAX) {
|
||||
if (net_ratelimit())
|
||||
printk("nf_nat_h323: out of expectations\n");
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Try to get a pair of ports. */
|
||||
for (nated_port = ntohs(rtp_exp->tuple.dst.u.udp.port);
|
||||
nated_port != 0; nated_port += 2) {
|
||||
rtp_exp->tuple.dst.u.udp.port = htons(nated_port);
|
||||
if (nf_conntrack_expect_related(rtp_exp) == 0) {
|
||||
rtcp_exp->tuple.dst.u.udp.port =
|
||||
htons(nated_port + 1);
|
||||
if (nf_conntrack_expect_related(rtcp_exp) == 0)
|
||||
break;
|
||||
nf_conntrack_unexpect_related(rtp_exp);
|
||||
}
|
||||
}
|
||||
|
||||
if (nated_port == 0) { /* No port available */
|
||||
if (net_ratelimit())
|
||||
printk("nf_nat_h323: out of RTP ports\n");
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Modify signal */
|
||||
if (set_h245_addr(pskb, data, dataoff, taddr,
|
||||
&ct->tuplehash[!dir].tuple.dst.u3,
|
||||
htons((port & htons(1)) ? nated_port + 1 :
|
||||
nated_port)) == 0) {
|
||||
/* Save ports */
|
||||
info->rtp_port[i][dir] = rtp_port;
|
||||
info->rtp_port[i][!dir] = htons(nated_port);
|
||||
} else {
|
||||
nf_conntrack_unexpect_related(rtp_exp);
|
||||
nf_conntrack_unexpect_related(rtcp_exp);
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* Success */
|
||||
DEBUGP("nf_nat_h323: expect RTP %u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
|
||||
NIPQUAD(rtp_exp->tuple.src.ip),
|
||||
ntohs(rtp_exp->tuple.src.u.udp.port),
|
||||
NIPQUAD(rtp_exp->tuple.dst.ip),
|
||||
ntohs(rtp_exp->tuple.dst.u.udp.port));
|
||||
DEBUGP("nf_nat_h323: expect RTCP %u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
|
||||
NIPQUAD(rtcp_exp->tuple.src.ip),
|
||||
ntohs(rtcp_exp->tuple.src.u.udp.port),
|
||||
NIPQUAD(rtcp_exp->tuple.dst.ip),
|
||||
ntohs(rtcp_exp->tuple.dst.u.udp.port));
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/****************************************************************************/
|
||||
static int nat_t120(struct sk_buff **pskb, struct nf_conn *ct,
|
||||
enum ip_conntrack_info ctinfo,
|
||||
unsigned char **data, int dataoff,
|
||||
H245_TransportAddress *taddr, __be16 port,
|
||||
struct nf_conntrack_expect *exp)
|
||||
{
|
||||
int dir = CTINFO2DIR(ctinfo);
|
||||
u_int16_t nated_port = ntohs(port);
|
||||
|
||||
/* Set expectations for NAT */
|
||||
exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port;
|
||||
exp->expectfn = nf_nat_follow_master;
|
||||
exp->dir = !dir;
|
||||
|
||||
/* Try to get same port: if not, try to change it. */
|
||||
for (; nated_port != 0; nated_port++) {
|
||||
exp->tuple.dst.u.tcp.port = htons(nated_port);
|
||||
if (nf_conntrack_expect_related(exp) == 0)
|
||||
break;
|
||||
}
|
||||
|
||||
if (nated_port == 0) { /* No port available */
|
||||
if (net_ratelimit())
|
||||
printk("nf_nat_h323: out of TCP ports\n");
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Modify signal */
|
||||
if (set_h245_addr(pskb, data, dataoff, taddr,
|
||||
&ct->tuplehash[!dir].tuple.dst.u3,
|
||||
htons(nated_port)) < 0) {
|
||||
nf_conntrack_unexpect_related(exp);
|
||||
return -1;
|
||||
}
|
||||
|
||||
DEBUGP("nf_nat_h323: expect T.120 %u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
|
||||
NIPQUAD(exp->tuple.src.ip), ntohs(exp->tuple.src.u.tcp.port),
|
||||
NIPQUAD(exp->tuple.dst.ip), ntohs(exp->tuple.dst.u.tcp.port));
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/****************************************************************************/
|
||||
static int nat_h245(struct sk_buff **pskb, struct nf_conn *ct,
|
||||
enum ip_conntrack_info ctinfo,
|
||||
unsigned char **data, int dataoff,
|
||||
TransportAddress *taddr, __be16 port,
|
||||
struct nf_conntrack_expect *exp)
|
||||
{
|
||||
struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
|
||||
int dir = CTINFO2DIR(ctinfo);
|
||||
u_int16_t nated_port = ntohs(port);
|
||||
|
||||
/* Set expectations for NAT */
|
||||
exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port;
|
||||
exp->expectfn = nf_nat_follow_master;
|
||||
exp->dir = !dir;
|
||||
|
||||
/* Check existing expects */
|
||||
if (info->sig_port[dir] == port)
|
||||
nated_port = ntohs(info->sig_port[!dir]);
|
||||
|
||||
/* Try to get same port: if not, try to change it. */
|
||||
for (; nated_port != 0; nated_port++) {
|
||||
exp->tuple.dst.u.tcp.port = htons(nated_port);
|
||||
if (nf_conntrack_expect_related(exp) == 0)
|
||||
break;
|
||||
}
|
||||
|
||||
if (nated_port == 0) { /* No port available */
|
||||
if (net_ratelimit())
|
||||
printk("nf_nat_q931: out of TCP ports\n");
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Modify signal */
|
||||
if (set_h225_addr(pskb, data, dataoff, taddr,
|
||||
&ct->tuplehash[!dir].tuple.dst.u3,
|
||||
htons(nated_port)) == 0) {
|
||||
/* Save ports */
|
||||
info->sig_port[dir] = port;
|
||||
info->sig_port[!dir] = htons(nated_port);
|
||||
} else {
|
||||
nf_conntrack_unexpect_related(exp);
|
||||
return -1;
|
||||
}
|
||||
|
||||
DEBUGP("nf_nat_q931: expect H.245 %u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
|
||||
NIPQUAD(exp->tuple.src.ip), ntohs(exp->tuple.src.u.tcp.port),
|
||||
NIPQUAD(exp->tuple.dst.ip), ntohs(exp->tuple.dst.u.tcp.port));
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* This conntrack expect function replaces nf_conntrack_q931_expect()
|
||||
* which was set by nf_conntrack_h323.c.
|
||||
****************************************************************************/
|
||||
static void ip_nat_q931_expect(struct nf_conn *new,
|
||||
struct nf_conntrack_expect *this)
|
||||
{
|
||||
struct ip_nat_range range;
|
||||
|
||||
if (this->tuple.src.u3.ip != 0) { /* Only accept calls from GK */
|
||||
nf_nat_follow_master(new, this);
|
||||
return;
|
||||
}
|
||||
|
||||
/* This must be a fresh one. */
|
||||
BUG_ON(new->status & IPS_NAT_DONE_MASK);
|
||||
|
||||
/* Change src to where master sends to */
|
||||
range.flags = IP_NAT_RANGE_MAP_IPS;
|
||||
range.min_ip = range.max_ip = new->tuplehash[!this->dir].tuple.src.u3.ip;
|
||||
|
||||
/* hook doesn't matter, but it has to do source manip */
|
||||
nf_nat_setup_info(new, &range, NF_IP_POST_ROUTING);
|
||||
|
||||
/* For DST manip, map port here to where it's expected. */
|
||||
range.flags = (IP_NAT_RANGE_MAP_IPS | IP_NAT_RANGE_PROTO_SPECIFIED);
|
||||
range.min = range.max = this->saved_proto;
|
||||
range.min_ip = range.max_ip =
|
||||
new->master->tuplehash[!this->dir].tuple.src.u3.ip;
|
||||
|
||||
/* hook doesn't matter, but it has to do destination manip */
|
||||
nf_nat_setup_info(new, &range, NF_IP_PRE_ROUTING);
|
||||
}
|
||||
|
||||
/****************************************************************************/
|
||||
static int nat_q931(struct sk_buff **pskb, struct nf_conn *ct,
|
||||
enum ip_conntrack_info ctinfo,
|
||||
unsigned char **data, TransportAddress *taddr, int idx,
|
||||
__be16 port, struct nf_conntrack_expect *exp)
|
||||
{
|
||||
struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
|
||||
int dir = CTINFO2DIR(ctinfo);
|
||||
u_int16_t nated_port = ntohs(port);
|
||||
union nf_conntrack_address addr;
|
||||
|
||||
/* Set expectations for NAT */
|
||||
exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port;
|
||||
exp->expectfn = ip_nat_q931_expect;
|
||||
exp->dir = !dir;
|
||||
|
||||
/* Check existing expects */
|
||||
if (info->sig_port[dir] == port)
|
||||
nated_port = ntohs(info->sig_port[!dir]);
|
||||
|
||||
/* Try to get same port: if not, try to change it. */
|
||||
for (; nated_port != 0; nated_port++) {
|
||||
exp->tuple.dst.u.tcp.port = htons(nated_port);
|
||||
if (nf_conntrack_expect_related(exp) == 0)
|
||||
break;
|
||||
}
|
||||
|
||||
if (nated_port == 0) { /* No port available */
|
||||
if (net_ratelimit())
|
||||
printk("nf_nat_ras: out of TCP ports\n");
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Modify signal */
|
||||
if (set_h225_addr(pskb, data, 0, &taddr[idx],
|
||||
&ct->tuplehash[!dir].tuple.dst.u3,
|
||||
htons(nated_port)) == 0) {
|
||||
/* Save ports */
|
||||
info->sig_port[dir] = port;
|
||||
info->sig_port[!dir] = htons(nated_port);
|
||||
|
||||
/* Fix for Gnomemeeting */
|
||||
if (idx > 0 &&
|
||||
get_h225_addr(ct, *data, &taddr[0], &addr, &port) &&
|
||||
(ntohl(addr.ip) & 0xff000000) == 0x7f000000) {
|
||||
set_h225_addr_hook(pskb, data, 0, &taddr[0],
|
||||
&ct->tuplehash[!dir].tuple.dst.u3,
|
||||
info->sig_port[!dir]);
|
||||
}
|
||||
} else {
|
||||
nf_conntrack_unexpect_related(exp);
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* Success */
|
||||
DEBUGP("nf_nat_ras: expect Q.931 %u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
|
||||
NIPQUAD(exp->tuple.src.ip), ntohs(exp->tuple.src.u.tcp.port),
|
||||
NIPQUAD(exp->tuple.dst.ip), ntohs(exp->tuple.dst.u.tcp.port));
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/****************************************************************************/
|
||||
static void ip_nat_callforwarding_expect(struct nf_conn *new,
|
||||
struct nf_conntrack_expect *this)
|
||||
{
|
||||
struct nf_nat_range range;
|
||||
|
||||
/* This must be a fresh one. */
|
||||
BUG_ON(new->status & IPS_NAT_DONE_MASK);
|
||||
|
||||
/* Change src to where master sends to */
|
||||
range.flags = IP_NAT_RANGE_MAP_IPS;
|
||||
range.min_ip = range.max_ip = new->tuplehash[!this->dir].tuple.src.u3.ip;
|
||||
|
||||
/* hook doesn't matter, but it has to do source manip */
|
||||
nf_nat_setup_info(new, &range, NF_IP_POST_ROUTING);
|
||||
|
||||
/* For DST manip, map port here to where it's expected. */
|
||||
range.flags = (IP_NAT_RANGE_MAP_IPS | IP_NAT_RANGE_PROTO_SPECIFIED);
|
||||
range.min = range.max = this->saved_proto;
|
||||
range.min_ip = range.max_ip = this->saved_ip;
|
||||
|
||||
/* hook doesn't matter, but it has to do destination manip */
|
||||
nf_nat_setup_info(new, &range, NF_IP_PRE_ROUTING);
|
||||
}
|
||||
|
||||
/****************************************************************************/
|
||||
static int nat_callforwarding(struct sk_buff **pskb, struct nf_conn *ct,
|
||||
enum ip_conntrack_info ctinfo,
|
||||
unsigned char **data, int dataoff,
|
||||
TransportAddress *taddr, __be16 port,
|
||||
struct nf_conntrack_expect *exp)
|
||||
{
|
||||
int dir = CTINFO2DIR(ctinfo);
|
||||
u_int16_t nated_port;
|
||||
|
||||
/* Set expectations for NAT */
|
||||
exp->saved_ip = exp->tuple.dst.u3.ip;
|
||||
exp->tuple.dst.u3.ip = ct->tuplehash[!dir].tuple.dst.u3.ip;
|
||||
exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port;
|
||||
exp->expectfn = ip_nat_callforwarding_expect;
|
||||
exp->dir = !dir;
|
||||
|
||||
/* Try to get same port: if not, try to change it. */
|
||||
for (nated_port = ntohs(port); nated_port != 0; nated_port++) {
|
||||
exp->tuple.dst.u.tcp.port = htons(nated_port);
|
||||
if (nf_conntrack_expect_related(exp) == 0)
|
||||
break;
|
||||
}
|
||||
|
||||
if (nated_port == 0) { /* No port available */
|
||||
if (net_ratelimit())
|
||||
printk("nf_nat_q931: out of TCP ports\n");
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Modify signal */
|
||||
if (!set_h225_addr(pskb, data, dataoff, taddr,
|
||||
&ct->tuplehash[!dir].tuple.dst.u3,
|
||||
htons(nated_port)) == 0) {
|
||||
nf_conntrack_unexpect_related(exp);
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* Success */
|
||||
DEBUGP("nf_nat_q931: expect Call Forwarding "
|
||||
"%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
|
||||
NIPQUAD(exp->tuple.src.ip), ntohs(exp->tuple.src.u.tcp.port),
|
||||
NIPQUAD(exp->tuple.dst.ip), ntohs(exp->tuple.dst.u.tcp.port));
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/****************************************************************************/
|
||||
static int __init init(void)
|
||||
{
|
||||
BUG_ON(rcu_dereference(set_h245_addr_hook) != NULL);
|
||||
BUG_ON(rcu_dereference(set_h225_addr_hook) != NULL);
|
||||
BUG_ON(rcu_dereference(set_sig_addr_hook) != NULL);
|
||||
BUG_ON(rcu_dereference(set_ras_addr_hook) != NULL);
|
||||
BUG_ON(rcu_dereference(nat_rtp_rtcp_hook) != NULL);
|
||||
BUG_ON(rcu_dereference(nat_t120_hook) != NULL);
|
||||
BUG_ON(rcu_dereference(nat_h245_hook) != NULL);
|
||||
BUG_ON(rcu_dereference(nat_callforwarding_hook) != NULL);
|
||||
BUG_ON(rcu_dereference(nat_q931_hook) != NULL);
|
||||
|
||||
rcu_assign_pointer(set_h245_addr_hook, set_h245_addr);
|
||||
rcu_assign_pointer(set_h225_addr_hook, set_h225_addr);
|
||||
rcu_assign_pointer(set_sig_addr_hook, set_sig_addr);
|
||||
rcu_assign_pointer(set_ras_addr_hook, set_ras_addr);
|
||||
rcu_assign_pointer(nat_rtp_rtcp_hook, nat_rtp_rtcp);
|
||||
rcu_assign_pointer(nat_t120_hook, nat_t120);
|
||||
rcu_assign_pointer(nat_h245_hook, nat_h245);
|
||||
rcu_assign_pointer(nat_callforwarding_hook, nat_callforwarding);
|
||||
rcu_assign_pointer(nat_q931_hook, nat_q931);
|
||||
|
||||
DEBUGP("nf_nat_h323: init success\n");
|
||||
return 0;
|
||||
}
|
||||
|
||||
/****************************************************************************/
|
||||
static void __exit fini(void)
|
||||
{
|
||||
rcu_assign_pointer(set_h245_addr_hook, NULL);
|
||||
rcu_assign_pointer(set_h225_addr_hook, NULL);
|
||||
rcu_assign_pointer(set_sig_addr_hook, NULL);
|
||||
rcu_assign_pointer(set_ras_addr_hook, NULL);
|
||||
rcu_assign_pointer(nat_rtp_rtcp_hook, NULL);
|
||||
rcu_assign_pointer(nat_t120_hook, NULL);
|
||||
rcu_assign_pointer(nat_h245_hook, NULL);
|
||||
rcu_assign_pointer(nat_callforwarding_hook, NULL);
|
||||
rcu_assign_pointer(nat_q931_hook, NULL);
|
||||
synchronize_rcu();
|
||||
}
|
||||
|
||||
/****************************************************************************/
|
||||
module_init(init);
|
||||
module_exit(fini);
|
||||
|
||||
MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>");
|
||||
MODULE_DESCRIPTION("H.323 NAT helper");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_ALIAS("ip_nat_h323");
|
||||
|
|
@ -160,6 +160,25 @@ config NF_CONNTRACK_FTP
|
|||
|
||||
To compile it as a module, choose M here. If unsure, say N.
|
||||
|
||||
config NF_CONNTRACK_H323
|
||||
tristate "H.323 protocol support (EXPERIMENTAL)"
|
||||
depends on EXPERIMENTAL && NF_CONNTRACK
|
||||
help
|
||||
H.323 is a VoIP signalling protocol from ITU-T. As one of the most
|
||||
important VoIP protocols, it is widely used by voice hardware and
|
||||
software including voice gateways, IP phones, Netmeeting, OpenPhone,
|
||||
Gnomemeeting, etc.
|
||||
|
||||
With this module you can support H.323 on a connection tracking/NAT
|
||||
firewall.
|
||||
|
||||
This module supports RAS, Fast Start, H.245 Tunnelling, Call
|
||||
Forwarding, RTP/RTCP and T.120 based audio, video, fax, chat,
|
||||
whiteboard, file transfer, etc. For more information, please
|
||||
visit http://nath323.sourceforge.net/.
|
||||
|
||||
To compile it as a module, choose M here. If unsure, say N.
|
||||
|
||||
config NF_CT_NETLINK
|
||||
tristate 'Connection tracking netlink interface (EXPERIMENTAL)'
|
||||
depends on EXPERIMENTAL && NF_CONNTRACK && NETFILTER_NETLINK
|
||||
|
|
|
|||
|
|
@ -20,8 +20,11 @@ obj-$(CONFIG_NF_CT_PROTO_SCTP) += nf_conntrack_proto_sctp.o
|
|||
obj-$(CONFIG_NF_CT_NETLINK) += nf_conntrack_netlink.o
|
||||
|
||||
# connection tracking helpers
|
||||
nf_conntrack_h323-objs := nf_conntrack_h323_main.o nf_conntrack_h323_asn1.o
|
||||
|
||||
obj-$(CONFIG_NF_CONNTRACK_AMANDA) += nf_conntrack_amanda.o
|
||||
obj-$(CONFIG_NF_CONNTRACK_FTP) += nf_conntrack_ftp.o
|
||||
obj-$(CONFIG_NF_CONNTRACK_H323) += nf_conntrack_h323.o
|
||||
|
||||
# generic X tables
|
||||
obj-$(CONFIG_NETFILTER_XTABLES) += x_tables.o xt_tcpudp.o
|
||||
|
|
|
|||
|
|
@ -15,7 +15,7 @@
|
|||
#else
|
||||
#include <stdio.h>
|
||||
#endif
|
||||
#include <linux/netfilter_ipv4/ip_conntrack_helper_h323_asn1.h>
|
||||
#include <linux/netfilter/nf_conntrack_h323_asn1.h>
|
||||
|
||||
/* Trace Flag */
|
||||
#ifndef H323_TRACE
|
||||
|
|
@ -144,7 +144,7 @@ static decoder_t Decoders[] = {
|
|||
/****************************************************************************
|
||||
* H.323 Types
|
||||
****************************************************************************/
|
||||
#include "ip_conntrack_helper_h323_types.c"
|
||||
#include "nf_conntrack_h323_types.c"
|
||||
|
||||
/****************************************************************************
|
||||
* Functions
|
||||
File diff suppressed because it is too large
Load Diff
|
|
@ -36,7 +36,8 @@ static field_t _TransportAddress_ipxAddress[] = { /* SEQUENCE */
|
|||
};
|
||||
|
||||
static field_t _TransportAddress_ip6Address[] = { /* SEQUENCE */
|
||||
{FNAME("ip") OCTSTR, FIXD, 16, 0, SKIP, 0, NULL},
|
||||
{FNAME("ip") OCTSTR, FIXD, 16, 0, DECODE,
|
||||
offsetof(TransportAddress_ip6Address, ip6), NULL},
|
||||
{FNAME("port") INT, WORD, 0, 0, SKIP, 0, NULL},
|
||||
};
|
||||
|
||||
|
|
@ -65,8 +66,8 @@ static field_t _TransportAddress[] = { /* CHOICE */
|
|||
_TransportAddress_ipSourceRoute},
|
||||
{FNAME("ipxAddress") SEQ, 0, 3, 3, SKIP, 0,
|
||||
_TransportAddress_ipxAddress},
|
||||
{FNAME("ip6Address") SEQ, 0, 2, 2, SKIP | EXT, 0,
|
||||
_TransportAddress_ip6Address},
|
||||
{FNAME("ip6Address") SEQ, 0, 2, 2, DECODE | EXT,
|
||||
offsetof(TransportAddress, ip6Address), _TransportAddress_ip6Address},
|
||||
{FNAME("netBios") OCTSTR, FIXD, 16, 0, SKIP, 0, NULL},
|
||||
{FNAME("nsap") OCTSTR, 5, 1, 0, SKIP, 0, NULL},
|
||||
{FNAME("nonStandardAddress") SEQ, 0, 2, 2, SKIP, 0,
|
||||
Loading…
Reference in New Issue