CONNMARK problem

CONNMARK problem

[Iulian Mongescu]

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Hi ,

I am trying to add CONNMARK support  to my kernel , and after 
compilation , the CONNMARK.o module is not made.
This is what I done on my RedHat 9 system:

   1. Get  kernel sources : linux-2.4.26.tar.gz 
   2. Get:  patch-o-matic-ng-20040302.tar.bz2
   3. Apply patch only for CONNMARK ( using  ./runme extra  , and test
      it with   ./runme --test CONNMARK)
          * Already applied:

            Testing CONNMARK... applied

            Excellent! Source trees are ready for compilation.
   4. make menuconfig ,and using the old config ( importing RedHat
      Athlon config)
   5. Selecting (like modules) :
          *   <M>   Connection state match support  
              <M>   Connection mark match support (NEW)
              <M>   Connection tracking match support 
   6. finish to compile without any errors , but  the CONNMARK.o module
      was not build
   7. Trying to figure what went wrong , I  saw that in .config there is
      not set CONFIG_IP_NF_TARGET_CONNMARK , which is required by
      Makefile to build the object :    
      obj-$(CONFIG_IP_NF_TARGET_CONNMARK) += ipt_CONNMARK.o
   8. More, I checked  Config.in file (from netfilter folder) and :
          * if [ "$CONFIG_IP_NF_CONNTRACK_MARK" != "n" ]; then
                  dep_tristate '  Connection mark match support'
            CONFIG_IP_NF_MATCH_CONNMARK $CONFIG_IP_NF_IPTABLES
                fi
          * As you see , it is testing if  $CONFIG_IP_NF_CONNTRACK_MARK
            ( which is not set by anybody , and get true cause is not
            "n" ) and is setting: CONFIG_IP_NF_MATCH_CONNMARK as a
            module in ".config" file .
          * Conclusion the only line in ".config" file regarding
            CONNTRACK is : CONFIG_IP_NF_MATCH_CONNMARK=m  , so normaly
            that make is not building CONNMARK.o
   9. I try to set manually in ".config" those variables, but is not
      working , I get some errors cause CONFIG_IP_NF_CONNTRACK_MARK is
      tested in ip_conntrack.h, and if  it is set manually is not
      exported ...duno why.<><><>

<><>Any help will be appreciated .
Thank you ,
Iulian

      <><> 


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connmark problem

[Krystian]

hi

I have a stock 2.6.9 kernel + iptables 1.2.11 + patch-o-matic-ng and i'm 
trying to apply CONNMARK patch.
 I cant patch it becouse it gest rejected while trying to apply it using 
POM.

Any clues?

Thanks
Krystian

Re: connmark problem

[Lopsch]

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Krystian schrieb:
> hi
> 
> I have a stock 2.6.9 kernel + iptables 1.2.11 + patch-o-matic-ng and i'm 
> trying to apply CONNMARK patch.
> I cant patch it becouse it gest rejected while trying to apply it using 
> POM.
> 
> Any clues?
> 
> Thanks
> Krystian
> 
> 
> 
Try this patch.

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diff -Nru --exclude-from=/sunbeam/home/laforge/scripts/dontdiff linux-2.6.9-test/include/linux/netfilter_ipv4/ip_conntrack.h linux-2.6.9-connmark/include/linux/netfilter_ipv4/ip_conntrack.h
--- linux-2.6.9-test/include/linux/netfilter_ipv4/ip_conntrack.h	2004-10-18 23:55:21.000000000 +0200
+++ linux-2.6.9-connmark/include/linux/netfilter_ipv4/ip_conntrack.h	2004-10-20 23:59:36.354104294 +0200
@@ -212,6 +212,10 @@
 	} nat;
 #endif /* CONFIG_IP_NF_NAT_NEEDED */
 
+#if defined(CONFIG_IP_NF_CONNTRACK_MARK)
+	unsigned long mark;
+#endif
+
 	/* Traversed often, so hopefully in different cacheline to top */
 	/* These are my tuples; original and reply */
 	struct ip_conntrack_tuple_hash tuplehash[IP_CT_DIR_MAX];
diff -Nru --exclude-from=/sunbeam/home/laforge/scripts/dontdiff linux-2.6.9-test/include/linux/netfilter_ipv4/ipt_CONNMARK.h linux-2.6.9-connmark/include/linux/netfilter_ipv4/ipt_CONNMARK.h
--- linux-2.6.9-test/include/linux/netfilter_ipv4/ipt_CONNMARK.h	1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.9-connmark/include/linux/netfilter_ipv4/ipt_CONNMARK.h	2004-10-20 23:59:36.343104676 +0200
@@ -0,0 +1,25 @@
+#ifndef _IPT_CONNMARK_H_target
+#define _IPT_CONNMARK_H_target
+
+/* Copyright (C) 2002,2004 MARA Systems AB <http://www.marasystems.com>>
+ * by Henrik Nordstrom <hno@marasystems.com>
+ *
+ * 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.
+ */
+
+enum {
+	IPT_CONNMARK_SET = 0,
+	IPT_CONNMARK_SAVE,
+	IPT_CONNMARK_RESTORE
+};
+
+struct ipt_connmark_target_info {
+	unsigned long mark;
+	unsigned long mask;
+	u_int8_t mode;
+};
+
+#endif /*_IPT_CONNMARK_H_target*/
diff -Nru --exclude-from=/sunbeam/home/laforge/scripts/dontdiff linux-2.6.9-test/include/linux/netfilter_ipv4/ipt_connmark.h linux-2.6.9-connmark/include/linux/netfilter_ipv4/ipt_connmark.h
--- linux-2.6.9-test/include/linux/netfilter_ipv4/ipt_connmark.h	1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.9-connmark/include/linux/netfilter_ipv4/ipt_connmark.h	2004-10-20 23:59:36.345104606 +0200
@@ -0,0 +1,18 @@
+#ifndef _IPT_CONNMARK_H
+#define _IPT_CONNMARK_H
+
+/* Copyright (C) 2002,2004 MARA Systems AB <http://www.marasystems.com>>
+ * by Henrik Nordstrom <hno@marasystems.com>
+ *
+ * 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.
+ */
+
+struct ipt_connmark_info {
+	unsigned long mark, mask;
+	u_int8_t invert;
+};
+
+#endif /*_IPT_CONNMARK_H*/
diff -Nru --exclude-from=/sunbeam/home/laforge/scripts/dontdiff linux-2.6.9-test/net/ipv4/netfilter/Kconfig linux-2.6.9-connmark/net/ipv4/netfilter/Kconfig
--- linux-2.6.9-test/net/ipv4/netfilter/Kconfig	2004-10-18 23:54:55.000000000 +0200
+++ linux-2.6.9-connmark/net/ipv4/netfilter/Kconfig	2004-10-21 00:16:30.830850002 +0200
@@ -32,6 +32,14 @@
 
 	  If unsure, say `N'.
 
+config IP_NF_CONNTRACK_MARK
+	bool  'Connection mark tracking support'
+	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 IP_NF_CT_PROTO_SCTP
 	tristate  'SCTP protocol connection tracking support (EXPERIMENTAL)'
 	depends on IP_NF_CONNTRACK && EXPERIMENTAL
@@ -342,6 +350,17 @@
 	  If you want to compile it as a module, say M here and read
 	  Documentation/modules.txt.  If unsure, say `N'.
 
+config IP_NF_MATCH_CONNMARK
+	tristate  'Connection mark match support'
+	depends on IP_NF_CONNTRACK_MARK && IP_NF_IPTABLES
+	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
+	  Documentation/modules.txt.  The module will be called
+	  ipt_connmark.o.  If unsure, say `N'.
+
 # `filter', generic and specific targets
 config IP_NF_FILTER
 	tristate "Packet filtering"
@@ -597,6 +616,18 @@
 
 	  To compile it as a module, choose M here.  If unsure, say N.
 
+config IP_NF_TARGET_CONNMARK
+	tristate  'CONNMARK target support'
+	depends on IP_NF_CONNTRACK_MARK && IP_NF_MANGLE
+	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
+	  Documentation/modules.txt.  The module will be called
+	  ipt_CONNMARK.o.  If unsure, say `N'.
+
 # raw + specific targets
 config IP_NF_RAW
 	tristate  'raw table support (required for NOTRACK/TRACE)'
diff -Nru --exclude-from=/sunbeam/home/laforge/scripts/dontdiff linux-2.6.9-test/net/ipv4/netfilter/Makefile linux-2.6.9-connmark/net/ipv4/netfilter/Makefile
--- linux-2.6.9-test/net/ipv4/netfilter/Makefile	2004-10-18 23:53:43.000000000 +0200
+++ linux-2.6.9-connmark/net/ipv4/netfilter/Makefile	2004-10-20 23:59:36.368103807 +0200
@@ -61,6 +61,7 @@
 obj-$(CONFIG_IP_NF_MATCH_LENGTH) += ipt_length.o
 obj-$(CONFIG_IP_NF_MATCH_TTL) += ipt_ttl.o
 obj-$(CONFIG_IP_NF_MATCH_STATE) += ipt_state.o
+obj-$(CONFIG_IP_NF_MATCH_CONNMARK) += ipt_connmark.o
 obj-$(CONFIG_IP_NF_MATCH_CONNTRACK) += ipt_conntrack.o
 obj-$(CONFIG_IP_NF_MATCH_TCPMSS) += ipt_tcpmss.o
 obj-$(CONFIG_IP_NF_MATCH_REALM) += ipt_realm.o
@@ -81,6 +82,7 @@
 obj-$(CONFIG_IP_NF_TARGET_CLASSIFY) += ipt_CLASSIFY.o
 obj-$(CONFIG_IP_NF_NAT_SNMP_BASIC) += ip_nat_snmp_basic.o
 obj-$(CONFIG_IP_NF_TARGET_LOG) += ipt_LOG.o
+obj-$(CONFIG_IP_NF_TARGET_CONNMARK) += ipt_CONNMARK.o
 obj-$(CONFIG_IP_NF_TARGET_ULOG) += ipt_ULOG.o
 obj-$(CONFIG_IP_NF_TARGET_TCPMSS) += ipt_TCPMSS.o
 obj-$(CONFIG_IP_NF_TARGET_NOTRACK) += ipt_NOTRACK.o
diff -Nru --exclude-from=/sunbeam/home/laforge/scripts/dontdiff linux-2.6.9-test/net/ipv4/netfilter/ip_conntrack_core.c linux-2.6.9-connmark/net/ipv4/netfilter/ip_conntrack_core.c
--- linux-2.6.9-test/net/ipv4/netfilter/ip_conntrack_core.c	2004-10-18 23:53:05.000000000 +0200
+++ linux-2.6.9-connmark/net/ipv4/netfilter/ip_conntrack_core.c	2004-10-20 23:59:36.402102626 +0200
@@ -595,6 +595,9 @@
 		__set_bit(IPS_EXPECTED_BIT, &conntrack->status);
 		conntrack->master = expected;
 		expected->sibling = conntrack;
+#if CONFIG_IP_NF_CONNTRACK_MARK
+		conntrack->mark = expected->expectant->mark;
+#endif
 		LIST_DELETE(&ip_conntrack_expect_list, expected);
 		expected->expectant->expecting--;
 		nf_conntrack_get(&master_ct(conntrack)->ct_general);
diff -Nru --exclude-from=/sunbeam/home/laforge/scripts/dontdiff linux-2.6.9-test/net/ipv4/netfilter/ip_conntrack_standalone.c linux-2.6.9-connmark/net/ipv4/netfilter/ip_conntrack_standalone.c
--- linux-2.6.9-test/net/ipv4/netfilter/ip_conntrack_standalone.c	2004-10-18 23:54:07.000000000 +0200
+++ linux-2.6.9-connmark/net/ipv4/netfilter/ip_conntrack_standalone.c	2004-10-21 00:01:55.101282662 +0200
@@ -146,6 +146,11 @@
 		if (seq_printf(s, "[ASSURED] "))
 			return 1;
 
+#if defined(CONFIG_IP_NF_CONNTRACK_MARK)
+	if (seq_printf(s, "mark=%ld ", conntrack->mark))
+		return 1;
+#endif
+
 	if (seq_printf(s, "use=%u\n", atomic_read(&conntrack->ct_general.use)))
 		return 1;
 
diff -Nru --exclude-from=/sunbeam/home/laforge/scripts/dontdiff linux-2.6.9-test/net/ipv4/netfilter/ipt_CONNMARK.c linux-2.6.9-connmark/net/ipv4/netfilter/ipt_CONNMARK.c
--- linux-2.6.9-test/net/ipv4/netfilter/ipt_CONNMARK.c	1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.9-connmark/net/ipv4/netfilter/ipt_CONNMARK.c	2004-10-20 23:59:36.347104537 +0200
@@ -0,0 +1,118 @@
+/* This kernel module is used to modify the connection mark values, or
+ * to optionally restore the skb nfmark from the connection mark
+ *
+ * Copyright (C) 2002,2004 MARA Systems AB <http://www.marasystems.com>>
+ * by Henrik Nordstrom <hno@marasystems.com>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <net/checksum.h>
+
+MODULE_AUTHOR("Henrik Nordstrom <hno@marasytems.com>");
+MODULE_DESCRIPTION("IP tables CONNMARK matching module");
+MODULE_LICENSE("GPL");
+
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_CONNMARK.h>
+#include <linux/netfilter_ipv4/ip_conntrack.h>
+
+static unsigned int
+target(struct sk_buff **pskb,
+       const struct net_device *in,
+       const struct net_device *out,
+       unsigned int hooknum,
+       const void *targinfo,
+       void *userinfo)
+{
+	const struct ipt_connmark_target_info *markinfo = targinfo;
+	unsigned long diff;
+	unsigned long nfmark;
+	unsigned long newmark;
+
+	enum ip_conntrack_info ctinfo;
+	struct ip_conntrack *ct = ip_conntrack_get((*pskb), &ctinfo);
+	if (ct) {
+	    switch(markinfo->mode) {
+	    case IPT_CONNMARK_SET:
+		newmark = (ct->mark & ~markinfo->mask) | markinfo->mark;
+		if (newmark != ct->mark)
+		    ct->mark = newmark;
+		break;
+	    case IPT_CONNMARK_SAVE:
+		newmark = (ct->mark & ~markinfo->mask) | ((*pskb)->nfmark & markinfo->mask);
+		if (ct->mark != newmark)
+		    ct->mark = newmark;
+		break;
+	    case IPT_CONNMARK_RESTORE:
+		nfmark = (*pskb)->nfmark;
+		diff = (ct->mark ^ nfmark & markinfo->mask);
+		if (diff != 0) {
+		    (*pskb)->nfmark = nfmark ^ diff;
+		    (*pskb)->nfcache |= NFC_ALTERED;
+		}
+		break;
+	    }
+	}
+
+	return IPT_CONTINUE;
+}
+
+static int
+checkentry(const char *tablename,
+	   const struct ipt_entry *e,
+	   void *targinfo,
+	   unsigned int targinfosize,
+	   unsigned int hook_mask)
+{
+	struct ipt_connmark_target_info *matchinfo = targinfo;
+	if (targinfosize != IPT_ALIGN(sizeof(struct ipt_connmark_target_info))) {
+		printk(KERN_WARNING "CONNMARK: targinfosize %u != %Zu\n",
+		       targinfosize,
+		       IPT_ALIGN(sizeof(struct ipt_connmark_target_info)));
+		return 0;
+	}
+
+	if (matchinfo->mode == IPT_CONNMARK_RESTORE) {
+	    if (strcmp(tablename, "mangle") != 0) {
+		    printk(KERN_WARNING "CONNMARK: restore can only be called from \"mangle\" table, not \"%s\"\n", tablename);
+		    return 0;
+	    }
+	}
+
+	return 1;
+}
+
+static struct ipt_target ipt_connmark_reg = {
+	.name = "CONNMARK",
+	.target = &target,
+	.checkentry = &checkentry,
+	.me = THIS_MODULE
+};
+
+static int __init init(void)
+{
+	return ipt_register_target(&ipt_connmark_reg);
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_target(&ipt_connmark_reg);
+}
+
+module_init(init);
+module_exit(fini);
diff -Nru --exclude-from=/sunbeam/home/laforge/scripts/dontdiff linux-2.6.9-test/net/ipv4/netfilter/ipt_connmark.c linux-2.6.9-connmark/net/ipv4/netfilter/ipt_connmark.c
--- linux-2.6.9-test/net/ipv4/netfilter/ipt_connmark.c	1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.9-connmark/net/ipv4/netfilter/ipt_connmark.c	2004-10-20 23:59:36.349104467 +0200
@@ -0,0 +1,81 @@
+/* This kernel module matches connection mark values set by the
+ * CONNMARK target
+ *
+ * Copyright (C) 2002,2004 MARA Systems AB <http://www.marasystems.com>>
+ * by Henrik Nordstrom <hno@marasystems.com>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+
+MODULE_AUTHOR("Henrik Nordstrom <hno@marasytems.com>");
+MODULE_DESCRIPTION("IP tables connmark match module");
+MODULE_LICENSE("GPL");
+
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_connmark.h>
+#include <linux/netfilter_ipv4/ip_conntrack.h>
+
+static int
+match(const struct sk_buff *skb,
+      const struct net_device *in,
+      const struct net_device *out,
+      const void *matchinfo,
+      int offset,
+      int *hotdrop)
+{
+	const struct ipt_connmark_info *info = matchinfo;
+	enum ip_conntrack_info ctinfo;
+	struct ip_conntrack *ct = ip_conntrack_get((struct sk_buff *)skb, &ctinfo);
+	if (!ct)
+		return 0;
+
+	return ((ct->mark & info->mask) == info->mark) ^ info->invert;
+}
+
+static int
+checkentry(const char *tablename,
+	   const struct ipt_ip *ip,
+	   void *matchinfo,
+	   unsigned int matchsize,
+	   unsigned int hook_mask)
+{
+	if (matchsize != IPT_ALIGN(sizeof(struct ipt_connmark_info)))
+		return 0;
+
+	return 1;
+}
+
+static struct ipt_match connmark_match = {
+	.name = "connmark",
+	.match = &match,
+	.checkentry = &checkentry,
+	.me = THIS_MODULE
+};
+
+static int __init init(void)
+{
+	return ipt_register_match(&connmark_match);
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_match(&connmark_match);
+}
+
+module_init(init);
+module_exit(fini);

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connmark problem

[Oguz Yilmaz]

Hi

I use connmark in raw table. Please look at the following -L output.
At the beginning of the chain I copy packet mark to the connection. -m
mark matches packets. However -m connmark not matches. It is clearly
visible from packet counters.
How can we explain this?

Regards,
OÄŸuz.


-t raw
Chain PREROUTING (policy ACCEPT 61M packets, 32G bytes)

 8173 4803K ACCEPT     all  --  *      *       127.0.0.1            0.0.0.0/0
 127K   35M CONNMARK   all  --  *      *       0.0.0.0/0
0.0.0.0/0           CONNMARK save
    0     0 LOG        all  --  *      *       0.0.0.0/0
0.0.0.0/0           CONNMARK match 0x12/0xfff LOG flags 0 level 6
prefix `ACCEPT:
'
    0     0 ACCEPT     all  --  *      *       0.0.0.0/0
0.0.0.0/0           CONNMARK match 0x12/0xfff
 7897 4074K LOG        all  --  *      *       0.0.0.0/0
0.0.0.0/0           MARK match 0x12/0xfff LOG flags 0 level 6 prefix
`ACCEPT:'
 7897 4074K ACCEPT     all  --  *      *       0.0.0.0/0
0.0.0.0/0           MARK match 0x12/0xfff

Re: connmark problem

[Andrew Beverley]

On Tue, 2012-06-26 at 11:38 +0300, Oguz Yilmaz wrote:
> Hi
> 
> I use connmark in raw table. Please look at the following -L output.
> At the beginning of the chain I copy packet mark to the connection. -m
> mark matches packets. However -m connmark not matches. It is clearly
> visible from packet counters.
> How can we explain this?

I'm guessing this is because the raw table is traversed before
connection tracking. See:

http://upload.wikimedia.org/wikipedia/commons/3/37/Netfilter-packet-flow.svg

Andy