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@@ -0,0 +1,2316 @@
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+diff -Nur linux-2.6.33.orig/include/linux/netfilter/nf_conntrack_rtsp.h linux-2.6.33/include/linux/netfilter/nf_conntrack_rtsp.h
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+--- linux-2.6.33.orig/include/linux/netfilter/nf_conntrack_rtsp.h 1970-01-01 01:00:00.000000000 +0100
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+@@ -0,0 +1,63 @@
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++/*
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++ * RTSP extension for IP connection tracking.
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++ * (C) 2003 by Tom Marshall <tmarshall at real.com>
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++ * based on ip_conntrack_irc.h
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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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++#ifndef _IP_CONNTRACK_RTSP_H
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++#define _IP_CONNTRACK_RTSP_H
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++
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++//#define IP_NF_RTSP_DEBUG 1
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++#define IP_NF_RTSP_VERSION "0.6.21"
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++
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++#ifdef __KERNEL__
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++/* port block types */
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++typedef enum {
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++ pb_single, /* client_port=x */
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++ pb_range, /* client_port=x-y */
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++ pb_discon /* client_port=x/y (rtspbis) */
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++} portblock_t;
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++
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++/* We record seq number and length of rtsp headers here, all in host order. */
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++
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++/*
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++ * This structure is per expected connection. It is a member of struct
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++ * ip_conntrack_expect. The TCP SEQ for the conntrack expect is stored
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++ * there and we are expected to only store the length of the data which
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++ * needs replaced. If a packet contains multiple RTSP messages, we create
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++ * one expected connection per message.
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++ *
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++ * We use these variables to mark the entire header block. This may seem
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++ * like overkill, but the nature of RTSP requires it. A header may appear
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++ * multiple times in a message. We must treat two Transport headers the
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++ * same as one Transport header with two entries.
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++ */
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++struct ip_ct_rtsp_expect
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++{
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++ u_int32_t len; /* length of header block */
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++ portblock_t pbtype; /* Type of port block that was requested */
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++ u_int16_t loport; /* Port that was requested, low or first */
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++ u_int16_t hiport; /* Port that was requested, high or second */
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++#if 0
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++ uint method; /* RTSP method */
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++ uint cseq; /* CSeq from request */
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++#endif
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++};
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++
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++extern unsigned int (*nf_nat_rtsp_hook)(struct sk_buff *skb,
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++ enum ip_conntrack_info ctinfo,
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++ unsigned int matchoff, unsigned int matchlen,
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++ struct ip_ct_rtsp_expect *prtspexp,
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++ struct nf_conntrack_expect *exp);
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++
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++extern void (*nf_nat_rtsp_hook_expectfn)(struct nf_conn *ct, struct nf_conntrack_expect *exp);
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++
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++#define RTSP_PORT 554
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++
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++#endif /* __KERNEL__ */
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++
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++#endif /* _IP_CONNTRACK_RTSP_H */
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+diff -Nur linux-2.6.33.orig/include/linux/netfilter_helpers.h linux-2.6.33/include/linux/netfilter_helpers.h
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+--- linux-2.6.33.orig/include/linux/netfilter_helpers.h 1970-01-01 01:00:00.000000000 +0100
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+@@ -0,0 +1,133 @@
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++/*
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++ * Helpers for netfiler modules. This file provides implementations for basic
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++ * functions such as strncasecmp(), etc.
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++ *
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++ * gcc will warn for defined but unused functions, so we only include the
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++ * functions requested. The following macros are used:
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++ * NF_NEED_STRNCASECMP nf_strncasecmp()
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++ * NF_NEED_STRTOU16 nf_strtou16()
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++ * NF_NEED_STRTOU32 nf_strtou32()
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++ */
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++#ifndef _NETFILTER_HELPERS_H
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++#define _NETFILTER_HELPERS_H
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++
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++/* Only include these functions for kernel code. */
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++#ifdef __KERNEL__
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++
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++#include <linux/ctype.h>
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++#define iseol(c) ( (c) == '\r' || (c) == '\n' )
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++
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++/*
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++ * The standard strncasecmp()
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++ */
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++#ifdef NF_NEED_STRNCASECMP
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++static int
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++nf_strncasecmp(const char* s1, const char* s2, u_int32_t len)
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++{
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++ if (s1 == NULL || s2 == NULL)
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++ {
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++ if (s1 == NULL && s2 == NULL)
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++ {
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++ return 0;
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++ }
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++ return (s1 == NULL) ? -1 : 1;
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++ }
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++ while (len > 0 && tolower(*s1) == tolower(*s2))
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++ {
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++ len--;
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++ s1++;
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++ s2++;
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++ }
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++ return ( (len == 0) ? 0 : (tolower(*s1) - tolower(*s2)) );
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++}
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++#endif /* NF_NEED_STRNCASECMP */
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++
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++/*
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++ * Parse a string containing a 16-bit unsigned integer.
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++ * Returns the number of chars used, or zero if no number is found.
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++ */
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++#ifdef NF_NEED_STRTOU16
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++static int
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++nf_strtou16(const char* pbuf, u_int16_t* pval)
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++{
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++ int n = 0;
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++
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++ *pval = 0;
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++ while (isdigit(pbuf[n]))
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++ {
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++ *pval = (*pval * 10) + (pbuf[n] - '0');
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++ n++;
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++ }
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++
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++ return n;
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++}
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++#endif /* NF_NEED_STRTOU16 */
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++
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++/*
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++ * Parse a string containing a 32-bit unsigned integer.
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++ * Returns the number of chars used, or zero if no number is found.
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++ */
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++#ifdef NF_NEED_STRTOU32
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++static int
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++nf_strtou32(const char* pbuf, u_int32_t* pval)
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++{
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++ int n = 0;
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++
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++ *pval = 0;
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++ while (pbuf[n] >= '0' && pbuf[n] <= '9')
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++ {
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++ *pval = (*pval * 10) + (pbuf[n] - '0');
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++ n++;
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++ }
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++
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++ return n;
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++}
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++#endif /* NF_NEED_STRTOU32 */
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++
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++/*
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++ * Given a buffer and length, advance to the next line and mark the current
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++ * line.
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++ */
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++#ifdef NF_NEED_NEXTLINE
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++static int
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++nf_nextline(char* p, uint len, uint* poff, uint* plineoff, uint* plinelen)
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++{
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++ uint off = *poff;
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++ uint physlen = 0;
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++
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++ if (off >= len)
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++ {
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++ return 0;
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++ }
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++
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++ while (p[off] != '\n')
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++ {
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++ if (len-off <= 1)
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++ {
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++ return 0;
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++ }
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++
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++ physlen++;
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++ off++;
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++ }
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++
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++ /* if we saw a crlf, physlen needs adjusted */
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++ if (physlen > 0 && p[off] == '\n' && p[off-1] == '\r')
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++ {
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++ physlen--;
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++ }
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++
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++ /* advance past the newline */
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++ off++;
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++
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++ *plineoff = *poff;
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++ *plinelen = physlen;
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++ *poff = off;
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++
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++ return 1;
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++}
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++#endif /* NF_NEED_NEXTLINE */
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++
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++#endif /* __KERNEL__ */
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++
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++#endif /* _NETFILTER_HELPERS_H */
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+diff -Nur linux-2.6.33.orig/include/linux/netfilter_mime.h linux-2.6.33/include/linux/netfilter_mime.h
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+--- linux-2.6.33.orig/include/linux/netfilter_mime.h 1970-01-01 01:00:00.000000000 +0100
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+@@ -0,0 +1,89 @@
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++/*
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++ * MIME functions for netfilter modules. This file provides implementations
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++ * for basic MIME parsing. MIME headers are used in many protocols, such as
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++ * HTTP, RTSP, SIP, etc.
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++ *
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++ * gcc will warn for defined but unused functions, so we only include the
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++ * functions requested. The following macros are used:
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++ * NF_NEED_MIME_NEXTLINE nf_mime_nextline()
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++ */
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++#ifndef _NETFILTER_MIME_H
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++#define _NETFILTER_MIME_H
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++
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++/* Only include these functions for kernel code. */
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++#ifdef __KERNEL__
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++
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++#include <linux/ctype.h>
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++
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++/*
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++ * Given a buffer and length, advance to the next line and mark the current
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++ * line. If the current line is empty, *plinelen will be set to zero. If
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++ * not, it will be set to the actual line length (including CRLF).
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++ *
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++ * 'line' in this context means logical line (includes LWS continuations).
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++ * Returns 1 on success, 0 on failure.
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++ */
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++#ifdef NF_NEED_MIME_NEXTLINE
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++static int
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++nf_mime_nextline(char* p, uint len, uint* poff, uint* plineoff, uint* plinelen)
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++{
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++ uint off = *poff;
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++ uint physlen = 0;
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++ int is_first_line = 1;
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++
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++ if (off >= len)
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++ {
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++ return 0;
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++ }
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++
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++ do
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++ {
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++ while (p[off] != '\n')
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++ {
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++ if (len-off <= 1)
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++ {
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++ return 0;
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++ }
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++
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++ physlen++;
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++ off++;
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++ }
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++
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++ /* if we saw a crlf, physlen needs adjusted */
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++ if (physlen > 0 && p[off] == '\n' && p[off-1] == '\r')
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++ {
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++ physlen--;
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++ }
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++
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++ /* advance past the newline */
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++ off++;
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++
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++ /* check for an empty line */
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++ if (physlen == 0)
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++ {
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++ break;
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++ }
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++
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++ /* check for colon on the first physical line */
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++ if (is_first_line)
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++ {
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++ is_first_line = 0;
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++ if (memchr(p+(*poff), ':', physlen) == NULL)
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++ {
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++ return 0;
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++ }
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++ }
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++ }
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++ while (p[off] == ' ' || p[off] == '\t');
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++
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++ *plineoff = *poff;
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++ *plinelen = (physlen == 0) ? 0 : (off - *poff);
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++ *poff = off;
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++
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++ return 1;
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++}
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++#endif /* NF_NEED_MIME_NEXTLINE */
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++
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++#endif /* __KERNEL__ */
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++
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++#endif /* _NETFILTER_MIME_H */
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+diff -Nur linux-2.6.33.orig/net/ipv4/netfilter/Kconfig linux-2.6.33/net/ipv4/netfilter/Kconfig
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+--- linux-2.6.33.orig/net/ipv4/netfilter/Kconfig 2010-02-24 19:52:17.000000000 +0100
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+@@ -257,6 +257,11 @@
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+ depends on NF_CONNTRACK && NF_NAT
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+ default NF_NAT && NF_CONNTRACK_IRC
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+
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++config NF_NAT_RTSP
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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_RTSP
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++
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+ config NF_NAT_TFTP
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+ tristate
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+ depends on NF_CONNTRACK && NF_NAT
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+diff -Nur linux-2.6.33.orig/net/ipv4/netfilter/Makefile linux-2.6.33/net/ipv4/netfilter/Makefile
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+--- linux-2.6.33.orig/net/ipv4/netfilter/Makefile 2010-02-24 19:52:17.000000000 +0100
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+@@ -26,6 +26,7 @@
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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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+ obj-$(CONFIG_NF_NAT_IRC) += nf_nat_irc.o
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++obj-$(CONFIG_NF_NAT_RTSP) += nf_nat_rtsp.o
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+ obj-$(CONFIG_NF_NAT_PPTP) += nf_nat_pptp.o
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+ obj-$(CONFIG_NF_NAT_SIP) += nf_nat_sip.o
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+ obj-$(CONFIG_NF_NAT_SNMP_BASIC) += nf_nat_snmp_basic.o
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+diff -Nur linux-2.6.33.orig/net/ipv4/netfilter/nf_nat_rtsp.c linux-2.6.33/net/ipv4/netfilter/nf_nat_rtsp.c
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+--- linux-2.6.33.orig/net/ipv4/netfilter/nf_nat_rtsp.c 1970-01-01 01:00:00.000000000 +0100
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+@@ -0,0 +1,496 @@
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++/*
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++ * RTSP extension for TCP NAT alteration
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++ * (C) 2003 by Tom Marshall <tmarshall at real.com>
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++ * based on ip_nat_irc.c
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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 nf_nat_rtsp.o ports=port1,port2,...port<MAX_PORTS>
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++ * stunaddr=<address>
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++ * destaction=[auto|strip|none]
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++ *
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++ * If no ports are specified, the default will be port 554 only.
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++ *
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++ * stunaddr specifies the address used to detect that a client is using STUN.
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++ * If this address is seen in the destination parameter, it is assumed that
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++ * the client has already punched a UDP hole in the firewall, so we don't
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++ * mangle the client_port. If none is specified, it is autodetected. It
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++ * only needs to be set if you have multiple levels of NAT. It should be
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++ * set to the external address that the STUN clients detect. Note that in
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++ * this case, it will not be possible for clients to use UDP with servers
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++ * between the NATs.
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++ *
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++ * If no destaction is specified, auto is used.
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++ * destaction=auto: strip destination parameter if it is not stunaddr.
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++ * destaction=strip: always strip destination parameter (not recommended).
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++ * destaction=none: do not touch destination parameter (not recommended).
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++ */
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++
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++#include <linux/module.h>
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++#include <net/tcp.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 <linux/netfilter/nf_conntrack_rtsp.h>
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++#include <net/netfilter/nf_conntrack_expect.h>
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++
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++#include <linux/inet.h>
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++#include <linux/ctype.h>
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++#define NF_NEED_STRNCASECMP
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++#define NF_NEED_STRTOU16
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++#include <linux/netfilter_helpers.h>
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++#define NF_NEED_MIME_NEXTLINE
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++#include <linux/netfilter_mime.h>
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++
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++#define INFOP(fmt, args...) printk(KERN_INFO "%s: %s: " fmt, __FILE__, __FUNCTION__ , ## args)
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++#if 0
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++#define DEBUGP(fmt, args...) printk(KERN_DEBUG "%s: %s: " fmt, __FILE__, __FUNCTION__ , ## args)
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++#else
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++#define DEBUGP(fmt, args...)
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++#endif
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++
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++#define MAX_PORTS 8
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++#define DSTACT_AUTO 0
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++#define DSTACT_STRIP 1
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++#define DSTACT_NONE 2
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++
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++static char* stunaddr = NULL;
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++static char* destaction = NULL;
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++
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++static u_int32_t extip = 0;
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++static int dstact = 0;
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++
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|
|
++MODULE_AUTHOR("Tom Marshall <tmarshall at real.com>");
|
|
|
++MODULE_DESCRIPTION("RTSP network address translation module");
|
|
|
++MODULE_LICENSE("GPL");
|
|
|
++module_param(stunaddr, charp, 0644);
|
|
|
++MODULE_PARM_DESC(stunaddr, "Address for detecting STUN");
|
|
|
++module_param(destaction, charp, 0644);
|
|
|
++MODULE_PARM_DESC(destaction, "Action for destination parameter (auto/strip/none)");
|
|
|
++
|
|
|
++#define SKIP_WSPACE(ptr,len,off) while(off < len && isspace(*(ptr+off))) { off++; }
|
|
|
++
|
|
|
++/*** helper functions ***/
|
|
|
++
|
|
|
++static void
|
|
|
++get_skb_tcpdata(struct sk_buff* skb, char** pptcpdata, uint* ptcpdatalen)
|
|
|
++{
|
|
|
++ struct iphdr* iph = ip_hdr(skb);
|
|
|
++ struct tcphdr* tcph = (void *)iph + ip_hdrlen(skb);
|
|
|
++
|
|
|
++ *pptcpdata = (char*)tcph + tcph->doff*4;
|
|
|
++ *ptcpdatalen = ((char*)skb_transport_header(skb) + skb->len) - *pptcpdata;
|
|
|
++}
|
|
|
++
|
|
|
++/*** nat functions ***/
|
|
|
++
|
|
|
++/*
|
|
|
++ * Mangle the "Transport:" header:
|
|
|
++ * - Replace all occurences of "client_port=<spec>"
|
|
|
++ * - Handle destination parameter
|
|
|
++ *
|
|
|
++ * In:
|
|
|
++ * ct, ctinfo = conntrack context
|
|
|
++ * skb = packet
|
|
|
++ * tranoff = Transport header offset from TCP data
|
|
|
++ * tranlen = Transport header length (incl. CRLF)
|
|
|
++ * rport_lo = replacement low port (host endian)
|
|
|
++ * rport_hi = replacement high port (host endian)
|
|
|
++ *
|
|
|
++ * Returns packet size difference.
|
|
|
++ *
|
|
|
++ * Assumes that a complete transport header is present, ending with CR or LF
|
|
|
++ */
|
|
|
++static int
|
|
|
++rtsp_mangle_tran(enum ip_conntrack_info ctinfo,
|
|
|
++ struct nf_conntrack_expect* exp,
|
|
|
++ struct ip_ct_rtsp_expect* prtspexp,
|
|
|
++ struct sk_buff* skb, uint tranoff, uint tranlen)
|
|
|
++{
|
|
|
++ char* ptcp;
|
|
|
++ uint tcplen;
|
|
|
++ char* ptran;
|
|
|
++ char rbuf1[16]; /* Replacement buffer (one port) */
|
|
|
++ uint rbuf1len; /* Replacement len (one port) */
|
|
|
++ char rbufa[16]; /* Replacement buffer (all ports) */
|
|
|
++ uint rbufalen; /* Replacement len (all ports) */
|
|
|
++ u_int32_t newip;
|
|
|
++ u_int16_t loport, hiport;
|
|
|
++ uint off = 0;
|
|
|
++ uint diff; /* Number of bytes we removed */
|
|
|
++
|
|
|
++ struct nf_conn *ct = exp->master;
|
|
|
++ struct nf_conntrack_tuple *t;
|
|
|
++
|
|
|
++ char szextaddr[15+1];
|
|
|
++ uint extaddrlen;
|
|
|
++ int is_stun;
|
|
|
++
|
|
|
++ get_skb_tcpdata(skb, &ptcp, &tcplen);
|
|
|
++ ptran = ptcp+tranoff;
|
|
|
++
|
|
|
++ if (tranoff+tranlen > tcplen || tcplen-tranoff < tranlen ||
|
|
|
++ tranlen < 10 || !iseol(ptran[tranlen-1]) ||
|
|
|
++ nf_strncasecmp(ptran, "Transport:", 10) != 0)
|
|
|
++ {
|
|
|
++ INFOP("sanity check failed\n");
|
|
|
++ return 0;
|
|
|
++ }
|
|
|
++ off += 10;
|
|
|
++ SKIP_WSPACE(ptcp+tranoff, tranlen, off);
|
|
|
++
|
|
|
++ newip = ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u3.ip;
|
|
|
++ t = &exp->tuple;
|
|
|
++ t->dst.u3.ip = newip;
|
|
|
++
|
|
|
++ extaddrlen = extip ? sprintf(szextaddr, "%u.%u.%u.%u", NIPQUAD(extip))
|
|
|
++ : sprintf(szextaddr, "%u.%u.%u.%u", NIPQUAD(newip));
|
|
|
++ DEBUGP("stunaddr=%s (%s)\n", szextaddr, (extip?"forced":"auto"));
|
|
|
++
|
|
|
++ rbuf1len = rbufalen = 0;
|
|
|
++ switch (prtspexp->pbtype)
|
|
|
++ {
|
|
|
++ case pb_single:
|
|
|
++ for (loport = prtspexp->loport; loport != 0; loport++) /* XXX: improper wrap? */
|
|
|
++ {
|
|
|
++ t->dst.u.udp.port = htons(loport);
|
|
|
++ if (nf_ct_expect_related(exp) == 0)
|
|
|
++ {
|
|
|
++ DEBUGP("using port %hu\n", loport);
|
|
|
++ break;
|
|
|
++ }
|
|
|
++ }
|
|
|
++ if (loport != 0)
|
|
|
++ {
|
|
|
++ rbuf1len = sprintf(rbuf1, "%hu", loport);
|
|
|
++ rbufalen = sprintf(rbufa, "%hu", loport);
|
|
|
++ }
|
|
|
++ break;
|
|
|
++ case pb_range:
|
|
|
++ for (loport = prtspexp->loport; loport != 0; loport += 2) /* XXX: improper wrap? */
|
|
|
++ {
|
|
|
++ t->dst.u.udp.port = htons(loport);
|
|
|
++ if (nf_ct_expect_related(exp) == 0)
|
|
|
++ {
|
|
|
++ hiport = loport + ~exp->mask.src.u.udp.port;
|
|
|
++ DEBUGP("using ports %hu-%hu\n", loport, hiport);
|
|
|
++ break;
|
|
|
++ }
|
|
|
++ }
|
|
|
++ if (loport != 0)
|
|
|
++ {
|
|
|
++ rbuf1len = sprintf(rbuf1, "%hu", loport);
|
|
|
++ rbufalen = sprintf(rbufa, "%hu-%hu", loport, loport+1);
|
|
|
++ }
|
|
|
++ break;
|
|
|
++ case pb_discon:
|
|
|
++ for (loport = prtspexp->loport; loport != 0; loport++) /* XXX: improper wrap? */
|
|
|
++ {
|
|
|
++ t->dst.u.udp.port = htons(loport);
|
|
|
++ if (nf_ct_expect_related(exp) == 0)
|
|
|
++ {
|
|
|
++ DEBUGP("using port %hu (1 of 2)\n", loport);
|
|
|
++ break;
|
|
|
++ }
|
|
|
++ }
|
|
|
++ for (hiport = prtspexp->hiport; hiport != 0; hiport++) /* XXX: improper wrap? */
|
|
|
++ {
|
|
|
++ t->dst.u.udp.port = htons(hiport);
|
|
|
++ if (nf_ct_expect_related(exp) == 0)
|
|
|
++ {
|
|
|
++ DEBUGP("using port %hu (2 of 2)\n", hiport);
|
|
|
++ break;
|
|
|
++ }
|
|
|
++ }
|
|
|
++ if (loport != 0 && hiport != 0)
|
|
|
++ {
|
|
|
++ rbuf1len = sprintf(rbuf1, "%hu", loport);
|
|
|
++ if (hiport == loport+1)
|
|
|
++ {
|
|
|
++ rbufalen = sprintf(rbufa, "%hu-%hu", loport, hiport);
|
|
|
++ }
|
|
|
++ else
|
|
|
++ {
|
|
|
++ rbufalen = sprintf(rbufa, "%hu/%hu", loport, hiport);
|
|
|
++ }
|
|
|
++ }
|
|
|
++ break;
|
|
|
++ }
|
|
|
++
|
|
|
++ if (rbuf1len == 0)
|
|
|
++ {
|
|
|
++ return 0; /* cannot get replacement port(s) */
|
|
|
++ }
|
|
|
++
|
|
|
++ /* Transport: tran;field;field=val,tran;field;field=val,... */
|
|
|
++ while (off < tranlen)
|
|
|
++ {
|
|
|
++ uint saveoff;
|
|
|
++ const char* pparamend;
|
|
|
++ uint nextparamoff;
|
|
|
++
|
|
|
++ pparamend = memchr(ptran+off, ',', tranlen-off);
|
|
|
++ pparamend = (pparamend == NULL) ? ptran+tranlen : pparamend+1;
|
|
|
++ nextparamoff = pparamend-ptcp;
|
|
|
++
|
|
|
++ /*
|
|
|
++ * We pass over each param twice. On the first pass, we look for a
|
|
|
++ * destination= field. It is handled by the security policy. If it
|
|
|
++ * is present, allowed, and equal to our external address, we assume
|
|
|
++ * that STUN is being used and we leave the client_port= field alone.
|
|
|
++ */
|
|
|
++ is_stun = 0;
|
|
|
++ saveoff = off;
|
|
|
++ while (off < nextparamoff)
|
|
|
++ {
|
|
|
++ const char* pfieldend;
|
|
|
++ uint nextfieldoff;
|
|
|
++
|
|
|
++ pfieldend = memchr(ptran+off, ';', nextparamoff-off);
|
|
|
++ nextfieldoff = (pfieldend == NULL) ? nextparamoff : pfieldend-ptran+1;
|
|
|
++
|
|
|
++ if (dstact != DSTACT_NONE && strncmp(ptran+off, "destination=", 12) == 0)
|
|
|
++ {
|
|
|
++ if (strncmp(ptran+off+12, szextaddr, extaddrlen) == 0)
|
|
|
++ {
|
|
|
++ is_stun = 1;
|
|
|
++ }
|
|
|
++ if (dstact == DSTACT_STRIP || (dstact == DSTACT_AUTO && !is_stun))
|
|
|
++ {
|
|
|
++ diff = nextfieldoff-off;
|
|
|
++ if (!nf_nat_mangle_tcp_packet(skb, ct, ctinfo,
|
|
|
++ off, diff, NULL, 0))
|
|
|
++ {
|
|
|
++ /* mangle failed, all we can do is bail */
|
|
|
++ nf_ct_unexpect_related(exp);
|
|
|
++ return 0;
|
|
|
++ }
|
|
|
++ get_skb_tcpdata(skb, &ptcp, &tcplen);
|
|
|
++ ptran = ptcp+tranoff;
|
|
|
++ tranlen -= diff;
|
|
|
++ nextparamoff -= diff;
|
|
|
++ nextfieldoff -= diff;
|
|
|
++ }
|
|
|
++ }
|
|
|
++
|
|
|
++ off = nextfieldoff;
|
|
|
++ }
|
|
|
++ if (is_stun)
|
|
|
++ {
|
|
|
++ continue;
|
|
|
++ }
|
|
|
++ off = saveoff;
|
|
|
++ while (off < nextparamoff)
|
|
|
++ {
|
|
|
++ const char* pfieldend;
|
|
|
++ uint nextfieldoff;
|
|
|
++
|
|
|
++ pfieldend = memchr(ptran+off, ';', nextparamoff-off);
|
|
|
++ nextfieldoff = (pfieldend == NULL) ? nextparamoff : pfieldend-ptran+1;
|
|
|
++
|
|
|
++ if (strncmp(ptran+off, "client_port=", 12) == 0)
|
|
|
++ {
|
|
|
++ u_int16_t port;
|
|
|
++ uint numlen;
|
|
|
++ uint origoff;
|
|
|
++ uint origlen;
|
|
|
++ char* rbuf = rbuf1;
|
|
|
++ uint rbuflen = rbuf1len;
|
|
|
++
|
|
|
++ off += 12;
|
|
|
++ origoff = (ptran-ptcp)+off;
|
|
|
++ origlen = 0;
|
|
|
++ numlen = nf_strtou16(ptran+off, &port);
|
|
|
++ off += numlen;
|
|
|
++ origlen += numlen;
|
|
|
++ if (port != prtspexp->loport)
|
|
|
++ {
|
|
|
++ DEBUGP("multiple ports found, port %hu ignored\n", port);
|
|
|
++ }
|
|
|
++ else
|
|
|
++ {
|
|
|
++ if (ptran[off] == '-' || ptran[off] == '/')
|
|
|
++ {
|
|
|
++ off++;
|
|
|
++ origlen++;
|
|
|
++ numlen = nf_strtou16(ptran+off, &port);
|
|
|
++ off += numlen;
|
|
|
++ origlen += numlen;
|
|
|
++ rbuf = rbufa;
|
|
|
++ rbuflen = rbufalen;
|
|
|
++ }
|
|
|
++
|
|
|
++ /*
|
|
|
++ * note we cannot just memcpy() if the sizes are the same.
|
|
|
++ * the mangle function does skb resizing, checks for a
|
|
|
++ * cloned skb, and updates the checksums.
|
|
|
++ *
|
|
|
++ * parameter 4 below is offset from start of tcp data.
|
|
|
++ */
|
|
|
++ diff = origlen-rbuflen;
|
|
|
++ if (!nf_nat_mangle_tcp_packet(skb, ct, ctinfo,
|
|
|
++ origoff, origlen, rbuf, rbuflen))
|
|
|
++ {
|
|
|
++ /* mangle failed, all we can do is bail */
|
|
|
++ nf_ct_unexpect_related(exp);
|
|
|
++ return 0;
|
|
|
++ }
|
|
|
++ get_skb_tcpdata(skb, &ptcp, &tcplen);
|
|
|
++ ptran = ptcp+tranoff;
|
|
|
++ tranlen -= diff;
|
|
|
++ nextparamoff -= diff;
|
|
|
++ nextfieldoff -= diff;
|
|
|
++ }
|
|
|
++ }
|
|
|
++
|
|
|
++ off = nextfieldoff;
|
|
|
++ }
|
|
|
++
|
|
|
++ off = nextparamoff;
|
|
|
++ }
|
|
|
++
|
|
|
++ return 1;
|
|
|
++}
|
|
|
++
|
|
|
++static uint
|
|
|
++help_out(struct sk_buff *skb, enum ip_conntrack_info ctinfo,
|
|
|
++ unsigned int matchoff, unsigned int matchlen, struct ip_ct_rtsp_expect* prtspexp,
|
|
|
++ struct nf_conntrack_expect* exp)
|
|
|
++{
|
|
|
++ char* ptcp;
|
|
|
++ uint tcplen;
|
|
|
++ uint hdrsoff;
|
|
|
++ uint hdrslen;
|
|
|
++ uint lineoff;
|
|
|
++ uint linelen;
|
|
|
++ uint off;
|
|
|
++
|
|
|
++ //struct iphdr* iph = (struct iphdr*)skb->nh.iph;
|
|
|
++ //struct tcphdr* tcph = (struct tcphdr*)((void*)iph + iph->ihl*4);
|
|
|
++
|
|
|
++ get_skb_tcpdata(skb, &ptcp, &tcplen);
|
|
|
++ hdrsoff = matchoff;//exp->seq - ntohl(tcph->seq);
|
|
|
++ hdrslen = matchlen;
|
|
|
++ off = hdrsoff;
|
|
|
++ DEBUGP("NAT rtsp help_out\n");
|
|
|
++
|
|
|
++ while (nf_mime_nextline(ptcp, hdrsoff+hdrslen, &off, &lineoff, &linelen))
|
|
|
++ {
|
|
|
++ if (linelen == 0)
|
|
|
++ {
|
|
|
++ break;
|
|
|
++ }
|
|
|
++ if (off > hdrsoff+hdrslen)
|
|
|
++ {
|
|
|
++ INFOP("!! overrun !!");
|
|
|
++ break;
|
|
|
++ }
|
|
|
++ DEBUGP("hdr: len=%u, %.*s", linelen, (int)linelen, ptcp+lineoff);
|
|
|
++
|
|
|
++ if (nf_strncasecmp(ptcp+lineoff, "Transport:", 10) == 0)
|
|
|
++ {
|
|
|
++ uint oldtcplen = tcplen;
|
|
|
++ DEBUGP("hdr: Transport\n");
|
|
|
++ if (!rtsp_mangle_tran(ctinfo, exp, prtspexp, skb, lineoff, linelen))
|
|
|
++ {
|
|
|
++ DEBUGP("hdr: Transport mangle failed");
|
|
|
++ break;
|
|
|
++ }
|
|
|
++ get_skb_tcpdata(skb, &ptcp, &tcplen);
|
|
|
++ hdrslen -= (oldtcplen-tcplen);
|
|
|
++ off -= (oldtcplen-tcplen);
|
|
|
++ lineoff -= (oldtcplen-tcplen);
|
|
|
++ linelen -= (oldtcplen-tcplen);
|
|
|
++ DEBUGP("rep: len=%u, %.*s", linelen, (int)linelen, ptcp+lineoff);
|
|
|
++ }
|
|
|
++ }
|
|
|
++
|
|
|
++ return NF_ACCEPT;
|
|
|
++}
|
|
|
++
|
|
|
++static unsigned int
|
|
|
++help(struct sk_buff *skb, enum ip_conntrack_info ctinfo,
|
|
|
++ unsigned int matchoff, unsigned int matchlen, struct ip_ct_rtsp_expect* prtspexp,
|
|
|
++ struct nf_conntrack_expect* exp)
|
|
|
++{
|
|
|
++ int dir = CTINFO2DIR(ctinfo);
|
|
|
++ int rc = NF_ACCEPT;
|
|
|
++
|
|
|
++ switch (dir)
|
|
|
++ {
|
|
|
++ case IP_CT_DIR_ORIGINAL:
|
|
|
++ rc = help_out(skb, ctinfo, matchoff, matchlen, prtspexp, exp);
|
|
|
++ break;
|
|
|
++ case IP_CT_DIR_REPLY:
|
|
|
++ DEBUGP("unmangle ! %u\n", ctinfo);
|
|
|
++ /* XXX: unmangle */
|
|
|
++ rc = NF_ACCEPT;
|
|
|
++ break;
|
|
|
++ }
|
|
|
++ //UNLOCK_BH(&ip_rtsp_lock);
|
|
|
++
|
|
|
++ return rc;
|
|
|
++}
|
|
|
++
|
|
|
++static void expected(struct nf_conn* ct, struct nf_conntrack_expect *exp)
|
|
|
++{
|
|
|
++ struct nf_nat_multi_range_compat mr;
|
|
|
++ u_int32_t newdstip, newsrcip, newip;
|
|
|
++
|
|
|
++ struct nf_conn *master = ct->master;
|
|
|
++
|
|
|
++ newdstip = master->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u3.ip;
|
|
|
++ newsrcip = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u3.ip;
|
|
|
++ //FIXME (how to port that ?)
|
|
|
++ //code from 2.4 : newip = (HOOK2MANIP(hooknum) == IP_NAT_MANIP_SRC) ? newsrcip : newdstip;
|
|
|
++ newip = newdstip;
|
|
|
++
|
|
|
++ DEBUGP("newsrcip=%u.%u.%u.%u, newdstip=%u.%u.%u.%u, newip=%u.%u.%u.%u\n",
|
|
|
++ NIPQUAD(newsrcip), NIPQUAD(newdstip), 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;
|
|
|
++
|
|
|
++ nf_nat_setup_info(ct, &mr.range[0], IP_NAT_MANIP_DST);
|
|
|
++}
|
|
|
++
|
|
|
++
|
|
|
++static void __exit fini(void)
|
|
|
++{
|
|
|
++ nf_nat_rtsp_hook = NULL;
|
|
|
++ nf_nat_rtsp_hook_expectfn = NULL;
|
|
|
++ synchronize_net();
|
|
|
++}
|
|
|
++
|
|
|
++static int __init init(void)
|
|
|
++{
|
|
|
++ printk("nf_nat_rtsp v" IP_NF_RTSP_VERSION " loading\n");
|
|
|
++
|
|
|
++ BUG_ON(nf_nat_rtsp_hook);
|
|
|
++ nf_nat_rtsp_hook = help;
|
|
|
++ nf_nat_rtsp_hook_expectfn = &expected;
|
|
|
++
|
|
|
++ if (stunaddr != NULL)
|
|
|
++ extip = in_aton(stunaddr);
|
|
|
++
|
|
|
++ if (destaction != NULL) {
|
|
|
++ if (strcmp(destaction, "auto") == 0)
|
|
|
++ dstact = DSTACT_AUTO;
|
|
|
++
|
|
|
++ if (strcmp(destaction, "strip") == 0)
|
|
|
++ dstact = DSTACT_STRIP;
|
|
|
++
|
|
|
++ if (strcmp(destaction, "none") == 0)
|
|
|
++ dstact = DSTACT_NONE;
|
|
|
++ }
|
|
|
++
|
|
|
++ return 0;
|
|
|
++}
|
|
|
++
|
|
|
++module_init(init);
|
|
|
++module_exit(fini);
|
|
|
+diff -Nur linux-2.6.33.orig/net/netfilter/Kconfig linux-2.6.33/net/netfilter/Kconfig
|
|
|
+--- linux-2.6.33.orig/net/netfilter/Kconfig 2010-02-24 19:52:17.000000000 +0100
|
|
|
|
|
|
+@@ -268,6 +268,16 @@
|
|
|
+
|
|
|
+ To compile it as a module, choose M here. If unsure, say N.
|
|
|
+
|
|
|
++config NF_CONNTRACK_RTSP
|
|
|
++ tristate "RTSP protocol support"
|
|
|
++ depends on NF_CONNTRACK
|
|
|
++ help
|
|
|
++ Support the RTSP protocol. This allows UDP transports to be setup
|
|
|
++ properly, including RTP and RDT.
|
|
|
++
|
|
|
++ If you want to compile it as a module, say 'M' here and read
|
|
|
++ Documentation/modules.txt. If unsure, say 'Y'.
|
|
|
++
|
|
|
+ config NF_CT_NETLINK
|
|
|
+ tristate 'Connection tracking netlink interface'
|
|
|
+ select NETFILTER_NETLINK
|
|
|
+diff -Nur linux-2.6.33.orig/net/netfilter/Kconfig.orig linux-2.6.33/net/netfilter/Kconfig.orig
|
|
|
+--- linux-2.6.33.orig/net/netfilter/Kconfig.orig 1970-01-01 01:00:00.000000000 +0100
|
|
|
|
|
|
+@@ -0,0 +1,937 @@
|
|
|
++menu "Core Netfilter Configuration"
|
|
|
++ depends on NET && INET && NETFILTER
|
|
|
++
|
|
|
++config NETFILTER_NETLINK
|
|
|
++ tristate
|
|
|
++
|
|
|
++config NETFILTER_NETLINK_QUEUE
|
|
|
++ tristate "Netfilter NFQUEUE over NFNETLINK interface"
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ select NETFILTER_NETLINK
|
|
|
++ help
|
|
|
++ If this option is enabled, the kernel will include support
|
|
|
++ for queueing packets via NFNETLINK.
|
|
|
++
|
|
|
++config NETFILTER_NETLINK_LOG
|
|
|
++ tristate "Netfilter LOG over NFNETLINK interface"
|
|
|
++ default m if NETFILTER_ADVANCED=n
|
|
|
++ select NETFILTER_NETLINK
|
|
|
++ help
|
|
|
++ If this option is enabled, the kernel will include support
|
|
|
++ for logging packets via NFNETLINK.
|
|
|
++
|
|
|
++ This obsoletes the existing ipt_ULOG and ebg_ulog mechanisms,
|
|
|
++ and is also scheduled to replace the old syslog-based ipt_LOG
|
|
|
++ and ip6t_LOG modules.
|
|
|
++
|
|
|
++config NF_CONNTRACK
|
|
|
++ tristate "Netfilter connection tracking support"
|
|
|
++ default m if NETFILTER_ADVANCED=n
|
|
|
++ help
|
|
|
++ Connection tracking keeps a record of what packets have passed
|
|
|
++ through your machine, in order to figure out how they are related
|
|
|
++ into connections.
|
|
|
++
|
|
|
++ This is required to do Masquerading or other kinds of Network
|
|
|
++ Address Translation. It can also be used to enhance packet
|
|
|
++ filtering (see `Connection state match support' below).
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++if NF_CONNTRACK
|
|
|
++
|
|
|
++config NF_CT_ACCT
|
|
|
++ bool "Connection tracking flow accounting"
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ help
|
|
|
++ If this option is enabled, the connection tracking code will
|
|
|
++ keep per-flow packet and byte counters.
|
|
|
++
|
|
|
++ Those counters can be used for flow-based accounting or the
|
|
|
++ `connbytes' match.
|
|
|
++
|
|
|
++ Please note that currently this option only sets a default state.
|
|
|
++ You may change it at boot time with nf_conntrack.acct=0/1 kernel
|
|
|
++ parameter or by loading the nf_conntrack module with acct=0/1.
|
|
|
++
|
|
|
++ You may also disable/enable it on a running system with:
|
|
|
++ sysctl net.netfilter.nf_conntrack_acct=0/1
|
|
|
++
|
|
|
++ This option will be removed in 2.6.29.
|
|
|
++
|
|
|
++ If unsure, say `N'.
|
|
|
++
|
|
|
++config NF_CONNTRACK_MARK
|
|
|
++ bool 'Connection mark tracking support'
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ help
|
|
|
++ This option enables support for connection marks, used by the
|
|
|
++ `CONNMARK' target and `connmark' match. Similar to the mark value
|
|
|
++ of packets, but this mark value is kept in the conntrack session
|
|
|
++ instead of the individual packets.
|
|
|
++
|
|
|
++config NF_CONNTRACK_SECMARK
|
|
|
++ bool 'Connection tracking security mark support'
|
|
|
++ depends on NETWORK_SECMARK
|
|
|
++ default m if NETFILTER_ADVANCED=n
|
|
|
++ help
|
|
|
++ This option enables security markings to be applied to
|
|
|
++ connections. Typically they are copied to connections from
|
|
|
++ packets using the CONNSECMARK target and copied back from
|
|
|
++ connections to packets with the same target, with the packets
|
|
|
++ being originally labeled via SECMARK.
|
|
|
++
|
|
|
++ If unsure, say 'N'.
|
|
|
++
|
|
|
++config NF_CONNTRACK_EVENTS
|
|
|
++ bool "Connection tracking events"
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ help
|
|
|
++ If this option is enabled, the connection tracking code will
|
|
|
++ provide a notifier chain that can be used by other kernel code
|
|
|
++ to get notified about changes in the connection tracking state.
|
|
|
++
|
|
|
++ If unsure, say `N'.
|
|
|
++
|
|
|
++config NF_CT_PROTO_DCCP
|
|
|
++ tristate 'DCCP protocol connection tracking support (EXPERIMENTAL)'
|
|
|
++ depends on EXPERIMENTAL
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ default IP_DCCP
|
|
|
++ help
|
|
|
++ With this option enabled, the layer 3 independent connection
|
|
|
++ tracking code will be able to do state tracking on DCCP connections.
|
|
|
++
|
|
|
++ If unsure, say 'N'.
|
|
|
++
|
|
|
++config NF_CT_PROTO_GRE
|
|
|
++ tristate
|
|
|
++
|
|
|
++config NF_CT_PROTO_SCTP
|
|
|
++ tristate 'SCTP protocol connection tracking support (EXPERIMENTAL)'
|
|
|
++ depends on EXPERIMENTAL
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ default IP_SCTP
|
|
|
++ help
|
|
|
++ With this option enabled, the layer 3 independent connection
|
|
|
++ tracking code will be able to do state tracking on SCTP connections.
|
|
|
++
|
|
|
++ If you want to compile it as a module, say M here and read
|
|
|
++ <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
|
|
|
++
|
|
|
++config NF_CT_PROTO_UDPLITE
|
|
|
++ tristate 'UDP-Lite protocol connection tracking support'
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ help
|
|
|
++ With this option enabled, the layer 3 independent connection
|
|
|
++ tracking code will be able to do state tracking on UDP-Lite
|
|
|
++ connections.
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++config NF_CONNTRACK_AMANDA
|
|
|
++ tristate "Amanda backup protocol support"
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ select TEXTSEARCH
|
|
|
++ select TEXTSEARCH_KMP
|
|
|
++ help
|
|
|
++ If you are running the Amanda backup package <http://www.amanda.org/>
|
|
|
++ on this machine or machines that will be MASQUERADED through this
|
|
|
++ machine, then you may want to enable this feature. This allows the
|
|
|
++ connection tracking and natting code to allow the sub-channels that
|
|
|
++ Amanda requires for communication of the backup data, messages and
|
|
|
++ index.
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++config NF_CONNTRACK_FTP
|
|
|
++ tristate "FTP protocol support"
|
|
|
++ default m if NETFILTER_ADVANCED=n
|
|
|
++ help
|
|
|
++ Tracking FTP connections is problematic: special helpers are
|
|
|
++ required for tracking them, and doing masquerading and other forms
|
|
|
++ of Network Address Translation on them.
|
|
|
++
|
|
|
++ This is FTP support on Layer 3 independent connection tracking.
|
|
|
++ Layer 3 independent connection tracking is experimental scheme
|
|
|
++ which generalize ip_conntrack to support other layer 3 protocols.
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++config NF_CONNTRACK_H323
|
|
|
++ tristate "H.323 protocol support"
|
|
|
++ depends on (IPV6 || IPV6=n)
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ 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_CONNTRACK_IRC
|
|
|
++ tristate "IRC protocol support"
|
|
|
++ default m if NETFILTER_ADVANCED=n
|
|
|
++ help
|
|
|
++ There is a commonly-used extension to IRC called
|
|
|
++ Direct Client-to-Client Protocol (DCC). This enables users to send
|
|
|
++ files to each other, and also chat to each other without the need
|
|
|
++ of a server. DCC Sending is used anywhere you send files over IRC,
|
|
|
++ and DCC Chat is most commonly used by Eggdrop bots. If you are
|
|
|
++ using NAT, this extension will enable you to send files and initiate
|
|
|
++ chats. Note that you do NOT need this extension to get files or
|
|
|
++ have others initiate chats, or everything else in IRC.
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++config NF_CONNTRACK_NETBIOS_NS
|
|
|
++ tristate "NetBIOS name service protocol support"
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ help
|
|
|
++ NetBIOS name service requests are sent as broadcast messages from an
|
|
|
++ unprivileged port and responded to with unicast messages to the
|
|
|
++ same port. This make them hard to firewall properly because connection
|
|
|
++ tracking doesn't deal with broadcasts. This helper tracks locally
|
|
|
++ originating NetBIOS name service requests and the corresponding
|
|
|
++ responses. It relies on correct IP address configuration, specifically
|
|
|
++ netmask and broadcast address. When properly configured, the output
|
|
|
++ of "ip address show" should look similar to this:
|
|
|
++
|
|
|
++ $ ip -4 address show eth0
|
|
|
++ 4: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
|
|
|
++ inet 172.16.2.252/24 brd 172.16.2.255 scope global eth0
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++config NF_CONNTRACK_PPTP
|
|
|
++ tristate "PPtP protocol support"
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ select NF_CT_PROTO_GRE
|
|
|
++ help
|
|
|
++ This module adds support for PPTP (Point to Point Tunnelling
|
|
|
++ Protocol, RFC2637) connection tracking and NAT.
|
|
|
++
|
|
|
++ If you are running PPTP sessions over a stateful firewall or NAT
|
|
|
++ box, you may want to enable this feature.
|
|
|
++
|
|
|
++ Please note that not all PPTP modes of operation are supported yet.
|
|
|
++ Specifically these limitations exist:
|
|
|
++ - Blindly assumes that control connections are always established
|
|
|
++ in PNS->PAC direction. This is a violation of RFC2637.
|
|
|
++ - Only supports a single call within each session
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++config NF_CONNTRACK_SANE
|
|
|
++ tristate "SANE protocol support (EXPERIMENTAL)"
|
|
|
++ depends on EXPERIMENTAL
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ help
|
|
|
++ SANE is a protocol for remote access to scanners as implemented
|
|
|
++ by the 'saned' daemon. Like FTP, it uses separate control and
|
|
|
++ data connections.
|
|
|
++
|
|
|
++ With this module you can support SANE on a connection tracking
|
|
|
++ firewall.
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++config NF_CONNTRACK_SIP
|
|
|
++ tristate "SIP protocol support"
|
|
|
++ default m if NETFILTER_ADVANCED=n
|
|
|
++ help
|
|
|
++ SIP is an application-layer control protocol that can establish,
|
|
|
++ modify, and terminate multimedia sessions (conferences) such as
|
|
|
++ Internet telephony calls. With the ip_conntrack_sip and
|
|
|
++ the nf_nat_sip modules you can support the protocol on a connection
|
|
|
++ tracking/NATing firewall.
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++config NF_CONNTRACK_TFTP
|
|
|
++ tristate "TFTP protocol support"
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ help
|
|
|
++ TFTP connection tracking helper, this is required depending
|
|
|
++ on how restrictive your ruleset is.
|
|
|
++ If you are using a tftp client behind -j SNAT or -j MASQUERADING
|
|
|
++ you will need this.
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++config NF_CT_NETLINK
|
|
|
++ tristate 'Connection tracking netlink interface'
|
|
|
++ select NETFILTER_NETLINK
|
|
|
++ default m if NETFILTER_ADVANCED=n
|
|
|
++ help
|
|
|
++ This option enables support for a netlink-based userspace interface
|
|
|
++
|
|
|
++endif # NF_CONNTRACK
|
|
|
++
|
|
|
++# transparent proxy support
|
|
|
++config NETFILTER_TPROXY
|
|
|
++ tristate "Transparent proxying support (EXPERIMENTAL)"
|
|
|
++ depends on EXPERIMENTAL
|
|
|
++ depends on IP_NF_MANGLE
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ help
|
|
|
++ This option enables transparent proxying support, that is,
|
|
|
++ support for handling non-locally bound IPv4 TCP and UDP sockets.
|
|
|
++ For it to work you will have to configure certain iptables rules
|
|
|
++ and use policy routing. For more information on how to set it up
|
|
|
++ see Documentation/networking/tproxy.txt.
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++config NETFILTER_XTABLES
|
|
|
++ tristate "Netfilter Xtables support (required for ip_tables)"
|
|
|
++ default m if NETFILTER_ADVANCED=n
|
|
|
++ help
|
|
|
++ This is required if you intend to use any of ip_tables,
|
|
|
++ ip6_tables or arp_tables.
|
|
|
++
|
|
|
++if NETFILTER_XTABLES
|
|
|
++
|
|
|
++# alphabetically ordered list of targets
|
|
|
++
|
|
|
++config NETFILTER_XT_TARGET_CLASSIFY
|
|
|
++ tristate '"CLASSIFY" target support'
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ help
|
|
|
++ This option adds a `CLASSIFY' target, which enables the user to set
|
|
|
++ the priority of a packet. Some qdiscs can use this value for
|
|
|
++ classification, among these are:
|
|
|
++
|
|
|
++ atm, cbq, dsmark, pfifo_fast, htb, prio
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++config NETFILTER_XT_TARGET_CONNMARK
|
|
|
++ tristate '"CONNMARK" target support'
|
|
|
++ depends on NF_CONNTRACK
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ select NF_CONNTRACK_MARK
|
|
|
++ help
|
|
|
++ This option adds a `CONNMARK' target, which allows one to manipulate
|
|
|
++ the connection mark value. Similar to the MARK target, but
|
|
|
++ affects the connection mark value rather than the packet mark value.
|
|
|
++
|
|
|
++ If you want to compile it as a module, say M here and read
|
|
|
++ <file:Documentation/kbuild/modules.txt>. The module will be called
|
|
|
++ ipt_CONNMARK. If unsure, say `N'.
|
|
|
++
|
|
|
++config NETFILTER_XT_TARGET_CONNSECMARK
|
|
|
++ tristate '"CONNSECMARK" target support'
|
|
|
++ depends on NF_CONNTRACK && NF_CONNTRACK_SECMARK
|
|
|
++ default m if NETFILTER_ADVANCED=n
|
|
|
++ help
|
|
|
++ The CONNSECMARK target copies security markings from packets
|
|
|
++ to connections, and restores security markings from connections
|
|
|
++ to packets (if the packets are not already marked). This would
|
|
|
++ normally be used in conjunction with the SECMARK target.
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++config NETFILTER_XT_TARGET_DSCP
|
|
|
++ tristate '"DSCP" and "TOS" target support'
|
|
|
++ depends on IP_NF_MANGLE || IP6_NF_MANGLE
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ help
|
|
|
++ This option adds a `DSCP' target, which allows you to manipulate
|
|
|
++ the IPv4/IPv6 header DSCP field (differentiated services codepoint).
|
|
|
++
|
|
|
++ The DSCP field can have any value between 0x0 and 0x3f inclusive.
|
|
|
++
|
|
|
++ It also adds the "TOS" target, which allows you to create rules in
|
|
|
++ the "mangle" table which alter the Type Of Service field of an IPv4
|
|
|
++ or the Priority field of an IPv6 packet, prior to routing.
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++config NETFILTER_XT_TARGET_HL
|
|
|
++ tristate '"HL" hoplimit target support'
|
|
|
++ depends on IP_NF_MANGLE || IP6_NF_MANGLE
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ ---help---
|
|
|
++ This option adds the "HL" (for IPv6) and "TTL" (for IPv4)
|
|
|
++ targets, which enable the user to change the
|
|
|
++ hoplimit/time-to-live value of the IP header.
|
|
|
++
|
|
|
++ While it is safe to decrement the hoplimit/TTL value, the
|
|
|
++ modules also allow to increment and set the hoplimit value of
|
|
|
++ the header to arbitrary values. This is EXTREMELY DANGEROUS
|
|
|
++ since you can easily create immortal packets that loop
|
|
|
++ forever on the network.
|
|
|
++
|
|
|
++config NETFILTER_XT_TARGET_LED
|
|
|
++ tristate '"LED" target support'
|
|
|
++ depends on LEDS_CLASS && LEDS_TRIGGERS
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ help
|
|
|
++ This option adds a `LED' target, which allows you to blink LEDs in
|
|
|
++ response to particular packets passing through your machine.
|
|
|
++
|
|
|
++ This can be used to turn a spare LED into a network activity LED,
|
|
|
++ which only flashes in response to FTP transfers, for example. Or
|
|
|
++ you could have an LED which lights up for a minute or two every time
|
|
|
++ somebody connects to your machine via SSH.
|
|
|
++
|
|
|
++ You will need support for the "led" class to make this work.
|
|
|
++
|
|
|
++ To create an LED trigger for incoming SSH traffic:
|
|
|
++ iptables -A INPUT -p tcp --dport 22 -j LED --led-trigger-id ssh --led-delay 1000
|
|
|
++
|
|
|
++ Then attach the new trigger to an LED on your system:
|
|
|
++ echo netfilter-ssh > /sys/class/leds/<ledname>/trigger
|
|
|
++
|
|
|
++ For more information on the LEDs available on your system, see
|
|
|
++ Documentation/leds-class.txt
|
|
|
++
|
|
|
++config NETFILTER_XT_TARGET_MARK
|
|
|
++ tristate '"MARK" target support'
|
|
|
++ default m if NETFILTER_ADVANCED=n
|
|
|
++ help
|
|
|
++ This option adds a `MARK' target, which allows you to create rules
|
|
|
++ in the `mangle' table which alter the netfilter mark (nfmark) field
|
|
|
++ associated with the packet prior to routing. This can change
|
|
|
++ the routing method (see `Use netfilter MARK value as routing
|
|
|
++ key') and can also be used by other subsystems to change their
|
|
|
++ behavior.
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++config NETFILTER_XT_TARGET_NFLOG
|
|
|
++ tristate '"NFLOG" target support'
|
|
|
++ default m if NETFILTER_ADVANCED=n
|
|
|
++ select NETFILTER_NETLINK_LOG
|
|
|
++ help
|
|
|
++ This option enables the NFLOG target, which allows to LOG
|
|
|
++ messages through nfnetlink_log.
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++config NETFILTER_XT_TARGET_NFQUEUE
|
|
|
++ tristate '"NFQUEUE" target Support'
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ help
|
|
|
++ This target replaced the old obsolete QUEUE target.
|
|
|
++
|
|
|
++ As opposed to QUEUE, it supports 65535 different queues,
|
|
|
++ not just one.
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++config NETFILTER_XT_TARGET_NOTRACK
|
|
|
++ tristate '"NOTRACK" target support'
|
|
|
++ depends on IP_NF_RAW || IP6_NF_RAW
|
|
|
++ depends on NF_CONNTRACK
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ help
|
|
|
++ The NOTRACK target allows a select rule to specify
|
|
|
++ which packets *not* to enter the conntrack/NAT
|
|
|
++ subsystem with all the consequences (no ICMP error tracking,
|
|
|
++ no protocol helpers for the selected packets).
|
|
|
++
|
|
|
++ If you want to compile it as a module, say M here and read
|
|
|
++ <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
|
|
|
++
|
|
|
++config NETFILTER_XT_TARGET_RATEEST
|
|
|
++ tristate '"RATEEST" target support'
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ help
|
|
|
++ This option adds a `RATEEST' target, which allows to measure
|
|
|
++ rates similar to TC estimators. The `rateest' match can be
|
|
|
++ used to match on the measured rates.
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++config NETFILTER_XT_TARGET_TPROXY
|
|
|
++ tristate '"TPROXY" target support (EXPERIMENTAL)'
|
|
|
++ depends on EXPERIMENTAL
|
|
|
++ depends on NETFILTER_TPROXY
|
|
|
++ depends on NETFILTER_XTABLES
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ select NF_DEFRAG_IPV4
|
|
|
++ help
|
|
|
++ This option adds a `TPROXY' target, which is somewhat similar to
|
|
|
++ REDIRECT. It can only be used in the mangle table and is useful
|
|
|
++ to redirect traffic to a transparent proxy. It does _not_ depend
|
|
|
++ on Netfilter connection tracking and NAT, unlike REDIRECT.
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++config NETFILTER_XT_TARGET_TRACE
|
|
|
++ tristate '"TRACE" target support'
|
|
|
++ depends on IP_NF_RAW || IP6_NF_RAW
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ help
|
|
|
++ The TRACE target allows you to mark packets so that the kernel
|
|
|
++ will log every rule which match the packets as those traverse
|
|
|
++ the tables, chains, rules.
|
|
|
++
|
|
|
++ If you want to compile it as a module, say M here and read
|
|
|
++ <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
|
|
|
++
|
|
|
++config NETFILTER_XT_TARGET_SECMARK
|
|
|
++ tristate '"SECMARK" target support'
|
|
|
++ depends on NETWORK_SECMARK
|
|
|
++ default m if NETFILTER_ADVANCED=n
|
|
|
++ help
|
|
|
++ The SECMARK target allows security marking of network
|
|
|
++ packets, for use with security subsystems.
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++config NETFILTER_XT_TARGET_TCPMSS
|
|
|
++ tristate '"TCPMSS" target support'
|
|
|
++ depends on (IPV6 || IPV6=n)
|
|
|
++ default m if NETFILTER_ADVANCED=n
|
|
|
++ ---help---
|
|
|
++ This option adds a `TCPMSS' target, which allows you to alter the
|
|
|
++ MSS value of TCP SYN packets, to control the maximum size for that
|
|
|
++ connection (usually limiting it to your outgoing interface's MTU
|
|
|
++ minus 40).
|
|
|
++
|
|
|
++ This is used to overcome criminally braindead ISPs or servers which
|
|
|
++ block ICMP Fragmentation Needed packets. The symptoms of this
|
|
|
++ problem are that everything works fine from your Linux
|
|
|
++ firewall/router, but machines behind it can never exchange large
|
|
|
++ packets:
|
|
|
++ 1) Web browsers connect, then hang with no data received.
|
|
|
++ 2) Small mail works fine, but large emails hang.
|
|
|
++ 3) ssh works fine, but scp hangs after initial handshaking.
|
|
|
++
|
|
|
++ Workaround: activate this option and add a rule to your firewall
|
|
|
++ configuration like:
|
|
|
++
|
|
|
++ iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN \
|
|
|
++ -j TCPMSS --clamp-mss-to-pmtu
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++config NETFILTER_XT_TARGET_TCPOPTSTRIP
|
|
|
++ tristate '"TCPOPTSTRIP" target support (EXPERIMENTAL)'
|
|
|
++ depends on EXPERIMENTAL
|
|
|
++ depends on IP_NF_MANGLE || IP6_NF_MANGLE
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ help
|
|
|
++ This option adds a "TCPOPTSTRIP" target, which allows you to strip
|
|
|
++ TCP options from TCP packets.
|
|
|
++
|
|
|
++config NETFILTER_XT_MATCH_CLUSTER
|
|
|
++ tristate '"cluster" match support'
|
|
|
++ depends on NF_CONNTRACK
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ ---help---
|
|
|
++ This option allows you to build work-load-sharing clusters of
|
|
|
++ network servers/stateful firewalls without having a dedicated
|
|
|
++ load-balancing router/server/switch. Basically, this match returns
|
|
|
++ true when the packet must be handled by this cluster node. Thus,
|
|
|
++ all nodes see all packets and this match decides which node handles
|
|
|
++ what packets. The work-load sharing algorithm is based on source
|
|
|
++ address hashing.
|
|
|
++
|
|
|
++ If you say Y or M here, try `iptables -m cluster --help` for
|
|
|
++ more information.
|
|
|
++
|
|
|
++config NETFILTER_XT_MATCH_COMMENT
|
|
|
++ tristate '"comment" match support'
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ help
|
|
|
++ This option adds a `comment' dummy-match, which allows you to put
|
|
|
++ comments in your iptables ruleset.
|
|
|
++
|
|
|
++ If you want to compile it as a module, say M here and read
|
|
|
++ <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
|
|
|
++
|
|
|
++config NETFILTER_XT_MATCH_CONNBYTES
|
|
|
++ tristate '"connbytes" per-connection counter match support'
|
|
|
++ depends on NF_CONNTRACK
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ select NF_CT_ACCT
|
|
|
++ help
|
|
|
++ This option adds a `connbytes' match, which allows you to match the
|
|
|
++ number of bytes and/or packets for each direction within a connection.
|
|
|
++
|
|
|
++ If you want to compile it as a module, say M here and read
|
|
|
++ <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
|
|
|
++
|
|
|
++config NETFILTER_XT_MATCH_CONNLIMIT
|
|
|
++ tristate '"connlimit" match support"'
|
|
|
++ depends on NF_CONNTRACK
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ ---help---
|
|
|
++ This match allows you to match against the number of parallel
|
|
|
++ connections to a server per client IP address (or address block).
|
|
|
++
|
|
|
++config NETFILTER_XT_MATCH_CONNMARK
|
|
|
++ tristate '"connmark" connection mark match support'
|
|
|
++ depends on NF_CONNTRACK
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ select NF_CONNTRACK_MARK
|
|
|
++ help
|
|
|
++ This option adds a `connmark' match, which allows you to match the
|
|
|
++ connection mark value previously set for the session by `CONNMARK'.
|
|
|
++
|
|
|
++ If you want to compile it as a module, say M here and read
|
|
|
++ <file:Documentation/kbuild/modules.txt>. The module will be called
|
|
|
++ ipt_connmark. If unsure, say `N'.
|
|
|
++
|
|
|
++config NETFILTER_XT_MATCH_CONNTRACK
|
|
|
++ tristate '"conntrack" connection tracking match support'
|
|
|
++ depends on NF_CONNTRACK
|
|
|
++ default m if NETFILTER_ADVANCED=n
|
|
|
++ help
|
|
|
++ This is a general conntrack match module, a superset of the state match.
|
|
|
++
|
|
|
++ It allows matching on additional conntrack information, which is
|
|
|
++ useful in complex configurations, such as NAT gateways with multiple
|
|
|
++ internet links or tunnels.
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++config NETFILTER_XT_MATCH_DCCP
|
|
|
++ tristate '"dccp" protocol match support'
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ default IP_DCCP
|
|
|
++ help
|
|
|
++ With this option enabled, you will be able to use the iptables
|
|
|
++ `dccp' match in order to match on DCCP source/destination ports
|
|
|
++ and DCCP flags.
|
|
|
++
|
|
|
++ If you want to compile it as a module, say M here and read
|
|
|
++ <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
|
|
|
++
|
|
|
++config NETFILTER_XT_MATCH_DSCP
|
|
|
++ tristate '"dscp" and "tos" match support'
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ help
|
|
|
++ This option adds a `DSCP' match, which allows you to match against
|
|
|
++ the IPv4/IPv6 header DSCP field (differentiated services codepoint).
|
|
|
++
|
|
|
++ The DSCP field can have any value between 0x0 and 0x3f inclusive.
|
|
|
++
|
|
|
++ It will also add a "tos" match, which allows you to match packets
|
|
|
++ based on the Type Of Service fields of the IPv4 packet (which share
|
|
|
++ the same bits as DSCP).
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++config NETFILTER_XT_MATCH_ESP
|
|
|
++ tristate '"esp" match support'
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ help
|
|
|
++ This match extension allows you to match a range of SPIs
|
|
|
++ inside ESP header of IPSec packets.
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++config NETFILTER_XT_MATCH_HASHLIMIT
|
|
|
++ tristate '"hashlimit" match support'
|
|
|
++ depends on (IP6_NF_IPTABLES || IP6_NF_IPTABLES=n)
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ help
|
|
|
++ This option adds a `hashlimit' match.
|
|
|
++
|
|
|
++ As opposed to `limit', this match dynamically creates a hash table
|
|
|
++ of limit buckets, based on your selection of source/destination
|
|
|
++ addresses and/or ports.
|
|
|
++
|
|
|
++ It enables you to express policies like `10kpps for any given
|
|
|
++ destination address' or `500pps from any given source address'
|
|
|
++ with a single rule.
|
|
|
++
|
|
|
++config NETFILTER_XT_MATCH_HELPER
|
|
|
++ tristate '"helper" match support'
|
|
|
++ depends on NF_CONNTRACK
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ help
|
|
|
++ Helper matching allows you to match packets in dynamic connections
|
|
|
++ tracked by a conntrack-helper, ie. ip_conntrack_ftp
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say Y.
|
|
|
++
|
|
|
++config NETFILTER_XT_MATCH_HL
|
|
|
++ tristate '"hl" hoplimit/TTL match support'
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ ---help---
|
|
|
++ HL matching allows you to match packets based on the hoplimit
|
|
|
++ in the IPv6 header, or the time-to-live field in the IPv4
|
|
|
++ header of the packet.
|
|
|
++
|
|
|
++config NETFILTER_XT_MATCH_IPRANGE
|
|
|
++ tristate '"iprange" address range match support'
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ ---help---
|
|
|
++ This option adds a "iprange" match, which allows you to match based on
|
|
|
++ an IP address range. (Normal iptables only matches on single addresses
|
|
|
++ with an optional mask.)
|
|
|
++
|
|
|
++ If unsure, say M.
|
|
|
++
|
|
|
++config NETFILTER_XT_MATCH_LENGTH
|
|
|
++ tristate '"length" match support'
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ help
|
|
|
++ This option allows you to match the length of a packet against a
|
|
|
++ specific value or range of values.
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++config NETFILTER_XT_MATCH_LIMIT
|
|
|
++ tristate '"limit" match support'
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ help
|
|
|
++ limit matching allows you to control the rate at which a rule can be
|
|
|
++ matched: mainly useful in combination with the LOG target ("LOG
|
|
|
++ target support", below) and to avoid some Denial of Service attacks.
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++config NETFILTER_XT_MATCH_MAC
|
|
|
++ tristate '"mac" address match support'
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ help
|
|
|
++ MAC matching allows you to match packets based on the source
|
|
|
++ Ethernet address of the packet.
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++config NETFILTER_XT_MATCH_MARK
|
|
|
++ tristate '"mark" match support'
|
|
|
++ default m if NETFILTER_ADVANCED=n
|
|
|
++ help
|
|
|
++ Netfilter mark matching allows you to match packets based on the
|
|
|
++ `nfmark' value in the packet. This can be set by the MARK target
|
|
|
++ (see below).
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++config NETFILTER_XT_MATCH_MULTIPORT
|
|
|
++ tristate '"multiport" Multiple port match support'
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ help
|
|
|
++ Multiport matching allows you to match TCP or UDP packets based on
|
|
|
++ a series of source or destination ports: normally a rule can only
|
|
|
++ match a single range of ports.
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++config NETFILTER_XT_MATCH_OWNER
|
|
|
++ tristate '"owner" match support'
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ ---help---
|
|
|
++ Socket owner matching allows you to match locally-generated packets
|
|
|
++ based on who created the socket: the user or group. It is also
|
|
|
++ possible to check whether a socket actually exists.
|
|
|
++
|
|
|
++config NETFILTER_XT_MATCH_POLICY
|
|
|
++ tristate 'IPsec "policy" match support'
|
|
|
++ depends on XFRM
|
|
|
++ default m if NETFILTER_ADVANCED=n
|
|
|
++ help
|
|
|
++ Policy matching allows you to match packets based on the
|
|
|
++ IPsec policy that was used during decapsulation/will
|
|
|
++ be used during encapsulation.
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++config NETFILTER_XT_MATCH_PHYSDEV
|
|
|
++ tristate '"physdev" match support'
|
|
|
++ depends on BRIDGE && BRIDGE_NETFILTER
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ help
|
|
|
++ Physdev packet matching matches against the physical bridge ports
|
|
|
++ the IP packet arrived on or will leave by.
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++config NETFILTER_XT_MATCH_PKTTYPE
|
|
|
++ tristate '"pkttype" packet type match support'
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ help
|
|
|
++ Packet type matching allows you to match a packet by
|
|
|
++ its "class", eg. BROADCAST, MULTICAST, ...
|
|
|
++
|
|
|
++ Typical usage:
|
|
|
++ iptables -A INPUT -m pkttype --pkt-type broadcast -j LOG
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++config NETFILTER_XT_MATCH_QUOTA
|
|
|
++ tristate '"quota" match support'
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ help
|
|
|
++ This option adds a `quota' match, which allows to match on a
|
|
|
++ byte counter.
|
|
|
++
|
|
|
++ If you want to compile it as a module, say M here and read
|
|
|
++ <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
|
|
|
++
|
|
|
++config NETFILTER_XT_MATCH_RATEEST
|
|
|
++ tristate '"rateest" match support'
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ select NETFILTER_XT_TARGET_RATEEST
|
|
|
++ help
|
|
|
++ This option adds a `rateest' match, which allows to match on the
|
|
|
++ rate estimated by the RATEEST target.
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++config NETFILTER_XT_MATCH_REALM
|
|
|
++ tristate '"realm" match support'
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ select NET_CLS_ROUTE
|
|
|
++ help
|
|
|
++ This option adds a `realm' match, which allows you to use the realm
|
|
|
++ key from the routing subsystem inside iptables.
|
|
|
++
|
|
|
++ This match pretty much resembles the CONFIG_NET_CLS_ROUTE4 option
|
|
|
++ in tc world.
|
|
|
++
|
|
|
++ If you want to compile it as a module, say M here and read
|
|
|
++ <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
|
|
|
++
|
|
|
++config NETFILTER_XT_MATCH_RECENT
|
|
|
++ tristate '"recent" match support'
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ ---help---
|
|
|
++ This match is used for creating one or many lists of recently
|
|
|
++ used addresses and then matching against that/those list(s).
|
|
|
++
|
|
|
++ Short options are available by using 'iptables -m recent -h'
|
|
|
++ Official Website: <http://snowman.net/projects/ipt_recent/>
|
|
|
++
|
|
|
++config NETFILTER_XT_MATCH_RECENT_PROC_COMPAT
|
|
|
++ bool 'Enable obsolete /proc/net/ipt_recent'
|
|
|
++ depends on NETFILTER_XT_MATCH_RECENT && PROC_FS
|
|
|
++ ---help---
|
|
|
++ This option enables the old /proc/net/ipt_recent interface,
|
|
|
++ which has been obsoleted by /proc/net/xt_recent.
|
|
|
++
|
|
|
++config NETFILTER_XT_MATCH_SCTP
|
|
|
++ tristate '"sctp" protocol match support (EXPERIMENTAL)'
|
|
|
++ depends on EXPERIMENTAL
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ default IP_SCTP
|
|
|
++ help
|
|
|
++ With this option enabled, you will be able to use the
|
|
|
++ `sctp' match in order to match on SCTP source/destination ports
|
|
|
++ and SCTP chunk types.
|
|
|
++
|
|
|
++ If you want to compile it as a module, say M here and read
|
|
|
++ <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
|
|
|
++
|
|
|
++config NETFILTER_XT_MATCH_SOCKET
|
|
|
++ tristate '"socket" match support (EXPERIMENTAL)'
|
|
|
++ depends on EXPERIMENTAL
|
|
|
++ depends on NETFILTER_TPROXY
|
|
|
++ depends on NETFILTER_XTABLES
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ depends on !NF_CONNTRACK || NF_CONNTRACK
|
|
|
++ select NF_DEFRAG_IPV4
|
|
|
++ help
|
|
|
++ This option adds a `socket' match, which can be used to match
|
|
|
++ packets for which a TCP or UDP socket lookup finds a valid socket.
|
|
|
++ It can be used in combination with the MARK target and policy
|
|
|
++ routing to implement full featured non-locally bound sockets.
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++config NETFILTER_XT_MATCH_STATE
|
|
|
++ tristate '"state" match support'
|
|
|
++ depends on NF_CONNTRACK
|
|
|
++ default m if NETFILTER_ADVANCED=n
|
|
|
++ help
|
|
|
++ Connection state matching allows you to match packets based on their
|
|
|
++ relationship to a tracked connection (ie. previous packets). This
|
|
|
++ is a powerful tool for packet classification.
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++config NETFILTER_XT_MATCH_STATISTIC
|
|
|
++ tristate '"statistic" match support'
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ help
|
|
|
++ This option adds a `statistic' match, which allows you to match
|
|
|
++ on packets periodically or randomly with a given percentage.
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++config NETFILTER_XT_MATCH_STRING
|
|
|
++ tristate '"string" match support'
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ select TEXTSEARCH
|
|
|
++ select TEXTSEARCH_KMP
|
|
|
++ select TEXTSEARCH_BM
|
|
|
++ select TEXTSEARCH_FSM
|
|
|
++ help
|
|
|
++ This option adds a `string' match, which allows you to look for
|
|
|
++ pattern matchings in packets.
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++config NETFILTER_XT_MATCH_TCPMSS
|
|
|
++ tristate '"tcpmss" match support'
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ help
|
|
|
++ This option adds a `tcpmss' match, which allows you to examine the
|
|
|
++ MSS value of TCP SYN packets, which control the maximum packet size
|
|
|
++ for that connection.
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++config NETFILTER_XT_MATCH_TIME
|
|
|
++ tristate '"time" match support'
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ ---help---
|
|
|
++ This option adds a "time" match, which allows you to match based on
|
|
|
++ the packet arrival time (at the machine which netfilter is running)
|
|
|
++ on) or departure time/date (for locally generated packets).
|
|
|
++
|
|
|
++ If you say Y here, try `iptables -m time --help` for
|
|
|
++ more information.
|
|
|
++
|
|
|
++ If you want to compile it as a module, say M here.
|
|
|
++ If unsure, say N.
|
|
|
++
|
|
|
++config NETFILTER_XT_MATCH_U32
|
|
|
++ tristate '"u32" match support'
|
|
|
++ depends on NETFILTER_ADVANCED
|
|
|
++ ---help---
|
|
|
++ u32 allows you to extract quantities of up to 4 bytes from a packet,
|
|
|
++ AND them with specified masks, shift them by specified amounts and
|
|
|
++ test whether the results are in any of a set of specified ranges.
|
|
|
++ The specification of what to extract is general enough to skip over
|
|
|
++ headers with lengths stored in the packet, as in IP or TCP header
|
|
|
++ lengths.
|
|
|
++
|
|
|
++ Details and examples are in the kernel module source.
|
|
|
++
|
|
|
++config NETFILTER_XT_MATCH_OSF
|
|
|
++ tristate '"osf" Passive OS fingerprint match'
|
|
|
++ depends on NETFILTER_ADVANCED && NETFILTER_NETLINK
|
|
|
++ help
|
|
|
++ This option selects the Passive OS Fingerprinting match module
|
|
|
++ that allows to passively match the remote operating system by
|
|
|
++ analyzing incoming TCP SYN packets.
|
|
|
++
|
|
|
++ Rules and loading software can be downloaded from
|
|
|
++ http://www.ioremap.net/projects/osf
|
|
|
++
|
|
|
++ To compile it as a module, choose M here. If unsure, say N.
|
|
|
++
|
|
|
++endif # NETFILTER_XTABLES
|
|
|
++
|
|
|
++endmenu
|
|
|
++
|
|
|
++source "net/netfilter/ipvs/Kconfig"
|
|
|
+diff -Nur linux-2.6.33.orig/net/netfilter/Makefile linux-2.6.33/net/netfilter/Makefile
|
|
|
+--- linux-2.6.33.orig/net/netfilter/Makefile 2010-02-24 19:52:17.000000000 +0100
|
|
|
|
|
|
+@@ -33,6 +33,7 @@
|
|
|
+ obj-$(CONFIG_NF_CONNTRACK_SANE) += nf_conntrack_sane.o
|
|
|
+ obj-$(CONFIG_NF_CONNTRACK_SIP) += nf_conntrack_sip.o
|
|
|
+ obj-$(CONFIG_NF_CONNTRACK_TFTP) += nf_conntrack_tftp.o
|
|
|
++obj-$(CONFIG_NF_CONNTRACK_RTSP) += nf_conntrack_rtsp.o
|
|
|
+
|
|
|
+ # transparent proxy support
|
|
|
+ obj-$(CONFIG_NETFILTER_TPROXY) += nf_tproxy_core.o
|
|
|
+diff -Nur linux-2.6.33.orig/net/netfilter/nf_conntrack_rtsp.c linux-2.6.33/net/netfilter/nf_conntrack_rtsp.c
|
|
|
+--- linux-2.6.33.orig/net/netfilter/nf_conntrack_rtsp.c 1970-01-01 01:00:00.000000000 +0100
|
|
|
|
|
|
+@@ -0,0 +1,517 @@
|
|
|
++/*
|
|
|
++ * RTSP extension for IP connection tracking
|
|
|
++ * (C) 2003 by Tom Marshall <tmarshall at real.com>
|
|
|
++ * based on ip_conntrack_irc.c
|
|
|
++ *
|
|
|
++ * This program is free software; you can redistribute it and/or
|
|
|
++ * modify it under the terms of the GNU General Public License
|
|
|
++ * as published by the Free Software Foundation; either version
|
|
|
++ * 2 of the License, or (at your option) any later version.
|
|
|
++ *
|
|
|
++ * Module load syntax:
|
|
|
++ * insmod nf_conntrack_rtsp.o ports=port1,port2,...port<MAX_PORTS>
|
|
|
++ * max_outstanding=n setup_timeout=secs
|
|
|
++ *
|
|
|
++ * If no ports are specified, the default will be port 554.
|
|
|
++ *
|
|
|
++ * With max_outstanding you can define the maximum number of not yet
|
|
|
++ * answered SETUP requests per RTSP session (default 8).
|
|
|
++ * With setup_timeout you can specify how long the system waits for
|
|
|
++ * an expected data channel (default 300 seconds).
|
|
|
++ *
|
|
|
++ * 2005-02-13: Harald Welte <laforge at netfilter.org>
|
|
|
++ * - port to 2.6
|
|
|
++ * - update to recent post-2.6.11 api changes
|
|
|
++ * 2006-09-14: Steven Van Acker <deepstar at singularity.be>
|
|
|
++ * - removed calls to NAT code from conntrack helper: NAT no longer needed to use rtsp-conntrack
|
|
|
++ * 2007-04-18: Michael Guntsche <mike at it-loops.com>
|
|
|
++ * - Port to new NF API
|
|
|
++ */
|
|
|
++
|
|
|
++#include <linux/module.h>
|
|
|
++#include <linux/netfilter.h>
|
|
|
++#include <linux/ip.h>
|
|
|
++#include <linux/inet.h>
|
|
|
++#include <net/tcp.h>
|
|
|
++
|
|
|
++#include <net/netfilter/nf_conntrack.h>
|
|
|
++#include <net/netfilter/nf_conntrack_expect.h>
|
|
|
++#include <net/netfilter/nf_conntrack_helper.h>
|
|
|
++#include <linux/netfilter/nf_conntrack_rtsp.h>
|
|
|
++
|
|
|
++#define NF_NEED_STRNCASECMP
|
|
|
++#define NF_NEED_STRTOU16
|
|
|
++#define NF_NEED_STRTOU32
|
|
|
++#define NF_NEED_NEXTLINE
|
|
|
++#include <linux/netfilter_helpers.h>
|
|
|
++#define NF_NEED_MIME_NEXTLINE
|
|
|
++#include <linux/netfilter_mime.h>
|
|
|
++
|
|
|
++#include <linux/ctype.h>
|
|
|
++#define MAX_SIMUL_SETUP 8 /* XXX: use max_outstanding */
|
|
|
++#define INFOP(fmt, args...) printk(KERN_INFO "%s: %s: " fmt, __FILE__, __FUNCTION__ , ## args)
|
|
|
++#if 0
|
|
|
++#define DEBUGP(fmt, args...) printk(KERN_DEBUG "%s: %s: " fmt, __FILE__, __FUNCTION__ , ## args)
|
|
|
++#else
|
|
|
++#define DEBUGP(fmt, args...)
|
|
|
++#endif
|
|
|
++
|
|
|
++#define MAX_PORTS 8
|
|
|
++static int ports[MAX_PORTS];
|
|
|
++static int num_ports = 0;
|
|
|
++static int max_outstanding = 8;
|
|
|
++static unsigned int setup_timeout = 300;
|
|
|
++
|
|
|
++MODULE_AUTHOR("Tom Marshall <tmarshall at real.com>");
|
|
|
++MODULE_DESCRIPTION("RTSP connection tracking module");
|
|
|
++MODULE_LICENSE("GPL");
|
|
|
++module_param_array(ports, int, &num_ports, 0400);
|
|
|
++MODULE_PARM_DESC(ports, "port numbers of RTSP servers");
|
|
|
++module_param(max_outstanding, int, 0400);
|
|
|
++MODULE_PARM_DESC(max_outstanding, "max number of outstanding SETUP requests per RTSP session");
|
|
|
++module_param(setup_timeout, int, 0400);
|
|
|
++MODULE_PARM_DESC(setup_timeout, "timeout on for unestablished data channels");
|
|
|
++
|
|
|
++static char *rtsp_buffer;
|
|
|
++static DEFINE_SPINLOCK(rtsp_buffer_lock);
|
|
|
++
|
|
|
++unsigned int (*nf_nat_rtsp_hook)(struct sk_buff *skb,
|
|
|
++ enum ip_conntrack_info ctinfo,
|
|
|
++ unsigned int matchoff, unsigned int matchlen,struct ip_ct_rtsp_expect* prtspexp,
|
|
|
++ struct nf_conntrack_expect *exp);
|
|
|
++void (*nf_nat_rtsp_hook_expectfn)(struct nf_conn *ct, struct nf_conntrack_expect *exp);
|
|
|
++
|
|
|
++EXPORT_SYMBOL_GPL(nf_nat_rtsp_hook);
|
|
|
++
|
|
|
++/*
|
|
|
++ * Max mappings we will allow for one RTSP connection (for RTP, the number
|
|
|
++ * of allocated ports is twice this value). Note that SMIL burns a lot of
|
|
|
++ * ports so keep this reasonably high. If this is too low, you will see a
|
|
|
++ * lot of "no free client map entries" messages.
|
|
|
++ */
|
|
|
++#define MAX_PORT_MAPS 16
|
|
|
++
|
|
|
++/*** default port list was here in the masq code: 554, 3030, 4040 ***/
|
|
|
++
|
|
|
++#define SKIP_WSPACE(ptr,len,off) while(off < len && isspace(*(ptr+off))) { off++; }
|
|
|
++
|
|
|
++/*
|
|
|
++ * Parse an RTSP packet.
|
|
|
++ *
|
|
|
++ * Returns zero if parsing failed.
|
|
|
++ *
|
|
|
++ * Parameters:
|
|
|
++ * IN ptcp tcp data pointer
|
|
|
++ * IN tcplen tcp data len
|
|
|
++ * IN/OUT ptcpoff points to current tcp offset
|
|
|
++ * OUT phdrsoff set to offset of rtsp headers
|
|
|
++ * OUT phdrslen set to length of rtsp headers
|
|
|
++ * OUT pcseqoff set to offset of CSeq header
|
|
|
++ * OUT pcseqlen set to length of CSeq header
|
|
|
++ */
|
|
|
++static int
|
|
|
++rtsp_parse_message(char* ptcp, uint tcplen, uint* ptcpoff,
|
|
|
++ uint* phdrsoff, uint* phdrslen,
|
|
|
++ uint* pcseqoff, uint* pcseqlen,
|
|
|
++ uint* transoff, uint* translen)
|
|
|
++{
|
|
|
++ uint entitylen = 0;
|
|
|
++ uint lineoff;
|
|
|
++ uint linelen;
|
|
|
++
|
|
|
++ if (!nf_nextline(ptcp, tcplen, ptcpoff, &lineoff, &linelen))
|
|
|
++ return 0;
|
|
|
++
|
|
|
++ *phdrsoff = *ptcpoff;
|
|
|
++ while (nf_mime_nextline(ptcp, tcplen, ptcpoff, &lineoff, &linelen)) {
|
|
|
++ if (linelen == 0) {
|
|
|
++ if (entitylen > 0)
|
|
|
++ *ptcpoff += min(entitylen, tcplen - *ptcpoff);
|
|
|
++ break;
|
|
|
++ }
|
|
|
++ if (lineoff+linelen > tcplen) {
|
|
|
++ INFOP("!! overrun !!\n");
|
|
|
++ break;
|
|
|
++ }
|
|
|
++
|
|
|
++ if (nf_strncasecmp(ptcp+lineoff, "CSeq:", 5) == 0) {
|
|
|
++ *pcseqoff = lineoff;
|
|
|
++ *pcseqlen = linelen;
|
|
|
++ }
|
|
|
++
|
|
|
++ if (nf_strncasecmp(ptcp+lineoff, "Transport:", 10) == 0) {
|
|
|
++ *transoff = lineoff;
|
|
|
++ *translen = linelen;
|
|
|
++ }
|
|
|
++
|
|
|
++ if (nf_strncasecmp(ptcp+lineoff, "Content-Length:", 15) == 0) {
|
|
|
++ uint off = lineoff+15;
|
|
|
++ SKIP_WSPACE(ptcp+lineoff, linelen, off);
|
|
|
++ nf_strtou32(ptcp+off, &entitylen);
|
|
|
++ }
|
|
|
++ }
|
|
|
++ *phdrslen = (*ptcpoff) - (*phdrsoff);
|
|
|
++
|
|
|
++ return 1;
|
|
|
++}
|
|
|
++
|
|
|
++/*
|
|
|
++ * Find lo/hi client ports (if any) in transport header
|
|
|
++ * In:
|
|
|
++ * ptcp, tcplen = packet
|
|
|
++ * tranoff, tranlen = buffer to search
|
|
|
++ *
|
|
|
++ * Out:
|
|
|
++ * pport_lo, pport_hi = lo/hi ports (host endian)
|
|
|
++ *
|
|
|
++ * Returns nonzero if any client ports found
|
|
|
++ *
|
|
|
++ * Note: it is valid (and expected) for the client to request multiple
|
|
|
++ * transports, so we need to parse the entire line.
|
|
|
++ */
|
|
|
++static int
|
|
|
++rtsp_parse_transport(char* ptran, uint tranlen,
|
|
|
++ struct ip_ct_rtsp_expect* prtspexp)
|
|
|
++{
|
|
|
++ int rc = 0;
|
|
|
++ uint off = 0;
|
|
|
++
|
|
|
++ if (tranlen < 10 || !iseol(ptran[tranlen-1]) ||
|
|
|
++ nf_strncasecmp(ptran, "Transport:", 10) != 0) {
|
|
|
++ INFOP("sanity check failed\n");
|
|
|
++ return 0;
|
|
|
++ }
|
|
|
++
|
|
|
++ DEBUGP("tran='%.*s'\n", (int)tranlen, ptran);
|
|
|
++ off += 10;
|
|
|
++ SKIP_WSPACE(ptran, tranlen, off);
|
|
|
++
|
|
|
++ /* Transport: tran;field;field=val,tran;field;field=val,... */
|
|
|
++ while (off < tranlen) {
|
|
|
++ const char* pparamend;
|
|
|
++ uint nextparamoff;
|
|
|
++
|
|
|
++ pparamend = memchr(ptran+off, ',', tranlen-off);
|
|
|
++ pparamend = (pparamend == NULL) ? ptran+tranlen : pparamend+1;
|
|
|
++ nextparamoff = pparamend-ptran;
|
|
|
++
|
|
|
++ while (off < nextparamoff) {
|
|
|
++ const char* pfieldend;
|
|
|
++ uint nextfieldoff;
|
|
|
++
|
|
|
++ pfieldend = memchr(ptran+off, ';', nextparamoff-off);
|
|
|
++ nextfieldoff = (pfieldend == NULL) ? nextparamoff : pfieldend-ptran+1;
|
|
|
++
|
|
|
++ if (strncmp(ptran+off, "client_port=", 12) == 0) {
|
|
|
++ u_int16_t port;
|
|
|
++ uint numlen;
|
|
|
++
|
|
|
++ off += 12;
|
|
|
++ numlen = nf_strtou16(ptran+off, &port);
|
|
|
++ off += numlen;
|
|
|
++ if (prtspexp->loport != 0 && prtspexp->loport != port)
|
|
|
++ DEBUGP("multiple ports found, port %hu ignored\n", port);
|
|
|
++ else {
|
|
|
++ DEBUGP("lo port found : %hu\n", port);
|
|
|
++ prtspexp->loport = prtspexp->hiport = port;
|
|
|
++ if (ptran[off] == '-') {
|
|
|
++ off++;
|
|
|
++ numlen = nf_strtou16(ptran+off, &port);
|
|
|
++ off += numlen;
|
|
|
++ prtspexp->pbtype = pb_range;
|
|
|
++ prtspexp->hiport = port;
|
|
|
++
|
|
|
++ // If we have a range, assume rtp:
|
|
|
++ // loport must be even, hiport must be loport+1
|
|
|
++ if ((prtspexp->loport & 0x0001) != 0 ||
|
|
|
++ prtspexp->hiport != prtspexp->loport+1) {
|
|
|
++ DEBUGP("incorrect range: %hu-%hu, correcting\n",
|
|
|
++ prtspexp->loport, prtspexp->hiport);
|
|
|
++ prtspexp->loport &= 0xfffe;
|
|
|
++ prtspexp->hiport = prtspexp->loport+1;
|
|
|
++ }
|
|
|
++ } else if (ptran[off] == '/') {
|
|
|
++ off++;
|
|
|
++ numlen = nf_strtou16(ptran+off, &port);
|
|
|
++ off += numlen;
|
|
|
++ prtspexp->pbtype = pb_discon;
|
|
|
++ prtspexp->hiport = port;
|
|
|
++ }
|
|
|
++ rc = 1;
|
|
|
++ }
|
|
|
++ }
|
|
|
++
|
|
|
++ /*
|
|
|
++ * Note we don't look for the destination parameter here.
|
|
|
++ * If we are using NAT, the NAT module will handle it. If not,
|
|
|
++ * and the client is sending packets elsewhere, the expectation
|
|
|
++ * will quietly time out.
|
|
|
++ */
|
|
|
++
|
|
|
++ off = nextfieldoff;
|
|
|
++ }
|
|
|
++
|
|
|
++ off = nextparamoff;
|
|
|
++ }
|
|
|
++
|
|
|
++ return rc;
|
|
|
++}
|
|
|
++
|
|
|
++void expected(struct nf_conn *ct, struct nf_conntrack_expect *exp)
|
|
|
++{
|
|
|
++ if(nf_nat_rtsp_hook_expectfn) {
|
|
|
++ nf_nat_rtsp_hook_expectfn(ct,exp);
|
|
|
++ }
|
|
|
++}
|
|
|
++
|
|
|
++/*** conntrack functions ***/
|
|
|
++
|
|
|
++/* outbound packet: client->server */
|
|
|
++
|
|
|
++static inline int
|
|
|
++help_out(struct sk_buff *skb, unsigned char *rb_ptr, unsigned int datalen,
|
|
|
++ struct nf_conn *ct, enum ip_conntrack_info ctinfo)
|
|
|
++{
|
|
|
++ struct ip_ct_rtsp_expect expinfo;
|
|
|
++
|
|
|
++ int dir = CTINFO2DIR(ctinfo); /* = IP_CT_DIR_ORIGINAL */
|
|
|
++ //struct tcphdr* tcph = (void*)iph + iph->ihl * 4;
|
|
|
++ //uint tcplen = pktlen - iph->ihl * 4;
|
|
|
++ char* pdata = rb_ptr;
|
|
|
++ //uint datalen = tcplen - tcph->doff * 4;
|
|
|
++ uint dataoff = 0;
|
|
|
++ int ret = NF_ACCEPT;
|
|
|
++
|
|
|
++ struct nf_conntrack_expect *exp;
|
|
|
++
|
|
|
++ __be16 be_loport;
|
|
|
++
|
|
|
++ memset(&expinfo, 0, sizeof(expinfo));
|
|
|
++
|
|
|
++ while (dataoff < datalen) {
|
|
|
++ uint cmdoff = dataoff;
|
|
|
++ uint hdrsoff = 0;
|
|
|
++ uint hdrslen = 0;
|
|
|
++ uint cseqoff = 0;
|
|
|
++ uint cseqlen = 0;
|
|
|
++ uint transoff = 0;
|
|
|
++ uint translen = 0;
|
|
|
++ uint off;
|
|
|
++
|
|
|
++ if (!rtsp_parse_message(pdata, datalen, &dataoff,
|
|
|
++ &hdrsoff, &hdrslen,
|
|
|
++ &cseqoff, &cseqlen,
|
|
|
++ &transoff, &translen))
|
|
|
++ break; /* not a valid message */
|
|
|
++
|
|
|
++ if (strncmp(pdata+cmdoff, "SETUP ", 6) != 0)
|
|
|
++ continue; /* not a SETUP message */
|
|
|
++ DEBUGP("found a setup message\n");
|
|
|
++
|
|
|
++ off = 0;
|
|
|
++ if(translen) {
|
|
|
++ rtsp_parse_transport(pdata+transoff, translen, &expinfo);
|
|
|
++ }
|
|
|
++
|
|
|
++ if (expinfo.loport == 0) {
|
|
|
++ DEBUGP("no udp transports found\n");
|
|
|
++ continue; /* no udp transports found */
|
|
|
++ }
|
|
|
++
|
|
|
++ DEBUGP("udp transport found, ports=(%d,%hu,%hu)\n",
|
|
|
++ (int)expinfo.pbtype, expinfo.loport, expinfo.hiport);
|
|
|
++
|
|
|
++ exp = nf_ct_expect_alloc(ct);
|
|
|
++ if (!exp) {
|
|
|
++ ret = NF_DROP;
|
|
|
++ goto out;
|
|
|
++ }
|
|
|
++
|
|
|
++ be_loport = htons(expinfo.loport);
|
|
|
++
|
|
|
++ nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT,
|
|
|
++ ct->tuplehash[!dir].tuple.src.l3num,
|
|
|
++ &ct->tuplehash[!dir].tuple.src.u3, &ct->tuplehash[!dir].tuple.dst.u3,
|
|
|
++ IPPROTO_UDP, NULL, &be_loport);
|
|
|
++
|
|
|
++ exp->master = ct;
|
|
|
++
|
|
|
++ exp->expectfn = expected;
|
|
|
++ exp->flags = 0;
|
|
|
++
|
|
|
++ if (expinfo.pbtype == pb_range) {
|
|
|
++ DEBUGP("Changing expectation mask to handle multiple ports\n");
|
|
|
++ exp->mask.src.u.udp.port = 0xfffe;
|
|
|
++ }
|
|
|
++
|
|
|
++ DEBUGP("expect_related %u.%u.%u.%u:%u-%u.%u.%u.%u:%u\n",
|
|
|
++ NIPQUAD(exp->tuple.src.u3.ip),
|
|
|
++ ntohs(exp->tuple.src.u.udp.port),
|
|
|
++ NIPQUAD(exp->tuple.dst.u3.ip),
|
|
|
++ ntohs(exp->tuple.dst.u.udp.port));
|
|
|
++
|
|
|
++ if (nf_nat_rtsp_hook)
|
|
|
++ /* pass the request off to the nat helper */
|
|
|
++ ret = nf_nat_rtsp_hook(skb, ctinfo, hdrsoff, hdrslen, &expinfo, exp);
|
|
|
++ else if (nf_ct_expect_related(exp) != 0) {
|
|
|
++ INFOP("nf_ct_expect_related failed\n");
|
|
|
++ ret = NF_DROP;
|
|
|
++ }
|
|
|
++ nf_ct_expect_put(exp);
|
|
|
++ goto out;
|
|
|
++ }
|
|
|
++out:
|
|
|
++
|
|
|
++ return ret;
|
|
|
++}
|
|
|
++
|
|
|
++
|
|
|
++static inline int
|
|
|
++help_in(struct sk_buff *skb, size_t pktlen,
|
|
|
++ struct nf_conn* ct, enum ip_conntrack_info ctinfo)
|
|
|
++{
|
|
|
++ return NF_ACCEPT;
|
|
|
++}
|
|
|
++
|
|
|
++static int help(struct sk_buff *skb, unsigned int protoff,
|
|
|
++ struct nf_conn *ct, enum ip_conntrack_info ctinfo)
|
|
|
++{
|
|
|
++ struct tcphdr _tcph, *th;
|
|
|
++ unsigned int dataoff, datalen;
|
|
|
++ char *rb_ptr;
|
|
|
++ int ret = NF_DROP;
|
|
|
++
|
|
|
++ /* 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("conntrackinfo = %u\n", ctinfo);
|
|
|
++ return NF_ACCEPT;
|
|
|
++ }
|
|
|
++
|
|
|
++ /* Not whole TCP header? */
|
|
|
++ th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph);
|
|
|
++
|
|
|
++ if (!th)
|
|
|
++ return NF_ACCEPT;
|
|
|
++
|
|
|
++ /* No data ? */
|
|
|
++ dataoff = protoff + th->doff*4;
|
|
|
++ datalen = skb->len - dataoff;
|
|
|
++ if (dataoff >= skb->len)
|
|
|
++ return NF_ACCEPT;
|
|
|
++
|
|
|
++ spin_lock_bh(&rtsp_buffer_lock);
|
|
|
++ rb_ptr = skb_header_pointer(skb, dataoff,
|
|
|
++ skb->len - dataoff, rtsp_buffer);
|
|
|
++ BUG_ON(rb_ptr == NULL);
|
|
|
++
|
|
|
++#if 0
|
|
|
++ /* Checksum invalid? Ignore. */
|
|
|
++ /* FIXME: Source route IP option packets --RR */
|
|
|
++ if (tcp_v4_check(tcph, tcplen, iph->saddr, iph->daddr,
|
|
|
++ csum_partial((char*)tcph, tcplen, 0)))
|
|
|
++ {
|
|
|
++ DEBUGP("bad csum: %p %u %u.%u.%u.%u %u.%u.%u.%u\n",
|
|
|
++ tcph, tcplen, NIPQUAD(iph->saddr), NIPQUAD(iph->daddr));
|
|
|
++ return NF_ACCEPT;
|
|
|
++ }
|
|
|
++#endif
|
|
|
++
|
|
|
++ switch (CTINFO2DIR(ctinfo)) {
|
|
|
++ case IP_CT_DIR_ORIGINAL:
|
|
|
++ ret = help_out(skb, rb_ptr, datalen, ct, ctinfo);
|
|
|
++ break;
|
|
|
++ case IP_CT_DIR_REPLY:
|
|
|
++ DEBUGP("IP_CT_DIR_REPLY\n");
|
|
|
++ /* inbound packet: server->client */
|
|
|
++ ret = NF_ACCEPT;
|
|
|
++ break;
|
|
|
++ }
|
|
|
++
|
|
|
++ spin_unlock_bh(&rtsp_buffer_lock);
|
|
|
++
|
|
|
++ return ret;
|
|
|
++}
|
|
|
++
|
|
|
++static struct nf_conntrack_helper rtsp_helpers[MAX_PORTS];
|
|
|
++static char rtsp_names[MAX_PORTS][10];
|
|
|
++static struct nf_conntrack_expect_policy rtsp_expect_policy;
|
|
|
++
|
|
|
++/* This function is intentionally _NOT_ defined as __exit */
|
|
|
++static void
|
|
|
++fini(void)
|
|
|
++{
|
|
|
++ int i;
|
|
|
++ for (i = 0; i < num_ports; i++) {
|
|
|
++ DEBUGP("unregistering port %d\n", ports[i]);
|
|
|
++ nf_conntrack_helper_unregister(&rtsp_helpers[i]);
|
|
|
++ }
|
|
|
++ kfree(rtsp_buffer);
|
|
|
++}
|
|
|
++
|
|
|
++static int __init
|
|
|
++init(void)
|
|
|
++{
|
|
|
++ int i, ret;
|
|
|
++ struct nf_conntrack_helper *hlpr;
|
|
|
++ char *tmpname;
|
|
|
++
|
|
|
++ printk("nf_conntrack_rtsp v" IP_NF_RTSP_VERSION " loading\n");
|
|
|
++
|
|
|
++ if (max_outstanding < 1) {
|
|
|
++ printk("nf_conntrack_rtsp: max_outstanding must be a positive integer\n");
|
|
|
++ return -EBUSY;
|
|
|
++ }
|
|
|
++ if (setup_timeout < 0) {
|
|
|
++ printk("nf_conntrack_rtsp: setup_timeout must be a positive integer\n");
|
|
|
++ return -EBUSY;
|
|
|
++ }
|
|
|
++
|
|
|
++ rtsp_expect_policy.max_expected = max_outstanding;
|
|
|
++ rtsp_expect_policy.timeout = setup_timeout;
|
|
|
++
|
|
|
++ rtsp_buffer = kmalloc(65536, GFP_KERNEL);
|
|
|
++ if (!rtsp_buffer)
|
|
|
++ return -ENOMEM;
|
|
|
++
|
|
|
++ /* If no port given, default to standard rtsp port */
|
|
|
++ if (ports[0] == 0) {
|
|
|
++ ports[0] = RTSP_PORT;
|
|
|
++ }
|
|
|
++
|
|
|
++ for (i = 0; (i < MAX_PORTS) && ports[i]; i++) {
|
|
|
++ hlpr = &rtsp_helpers[i];
|
|
|
++ memset(hlpr, 0, sizeof(struct nf_conntrack_helper));
|
|
|
++ hlpr->tuple.src.u.tcp.port = htons(ports[i]);
|
|
|
++ hlpr->tuple.dst.protonum = IPPROTO_TCP;
|
|
|
++ hlpr->expect_policy = &rtsp_expect_policy;
|
|
|
++ hlpr->me = THIS_MODULE;
|
|
|
++ hlpr->help = help;
|
|
|
++
|
|
|
++ tmpname = &rtsp_names[i][0];
|
|
|
++ if (ports[i] == RTSP_PORT) {
|
|
|
++ sprintf(tmpname, "rtsp");
|
|
|
++ } else {
|
|
|
++ sprintf(tmpname, "rtsp-%d", i);
|
|
|
++ }
|
|
|
++ hlpr->name = tmpname;
|
|
|
++
|
|
|
++ DEBUGP("port #%d: %d\n", i, ports[i]);
|
|
|
++
|
|
|
++ ret = nf_conntrack_helper_register(hlpr);
|
|
|
++
|
|
|
++ if (ret) {
|
|
|
++ printk("nf_conntrack_rtsp: ERROR registering port %d\n", ports[i]);
|
|
|
++ fini();
|
|
|
++ return -EBUSY;
|
|
|
++ }
|
|
|
++ num_ports++;
|
|
|
++ }
|
|
|
++ return 0;
|
|
|
++}
|
|
|
++
|
|
|
++module_init(init);
|
|
|
++module_exit(fini);
|
|
|
++
|
|
|
++EXPORT_SYMBOL(nf_nat_rtsp_hook_expectfn);
|
|
|
++
|
Waldemar Brodkorb