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From patchwork Thu Nov 29 13:52:20 2012
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Subject: conntrack: add support to dump the dying and unconfirmed list via
ctnetlink
Date: Thu, 29 Nov 2012 03:52:20 -0000
From: Pablo Neira <pablo@netfilter.org>
X-Patchwork-Id: 202751
Message-Id: <1354197140-8498-1-git-send-email-pablo@netfilter.org>
To: netfilter-devel@vger.kernel.org
From: Pablo Neira Ayuso <pablo@netfilter.org>
This patch adds support for:
conntrack -L dying
conntrack -L unconfirmed
To display the list of dying and unconfirmed conntracks. This provides
some instrumentation in case that `conntrack -C` really deviates from
what `conntrack -L | wc -l` says.
Users like to check this to make sure things are going OK. Still, some
conntrack objects may be still in the dying and the unconfirmed list.
With this patch, we can also dump their content, before it was not
possible.
In normal cases both lists would be simply empty, or in the case of
the dying list, you can observe that entries go slightly down in
number.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
src/conntrack.c | 108 ++++++++++++++++++++++++++++++++++++++++++++++++-------
1 file changed, 95 insertions(+), 13 deletions(-)
Index: conntrack-tools-oxnard-2d010c5/src/conntrack.c
===================================================================
--- conntrack-tools-oxnard-2d010c5.orig/src/conntrack.c 2012-11-30 22:02:18.356340288 +0100
+++ conntrack-tools-oxnard-2d010c5/src/conntrack.c 2012-11-30 22:02:31.011558172 +0100
@@ -820,27 +820,45 @@
*cmd |= newcmd;
}
-static unsigned int
-check_type(int argc, char *argv[])
+static char *get_table(int argc, char *argv[])
{
char *table = NULL;
- /* Nasty bug or feature in getopt_long ?
+ /* Nasty bug or feature in getopt_long ?
* It seems that it behaves badly with optional arguments.
* Fortunately, I just stole the fix from iptables ;) */
if (optarg)
return 0;
- else if (optind < argc && argv[optind][0] != '-'
- && argv[optind][0] != '!')
+ else if (optind < argc && argv[optind][0] != '-' &&
+ argv[optind][0] != '!')
table = argv[optind++];
-
- if (!table)
- return 0;
-
+
+ return table;
+}
+
+enum {
+ CT_TABLE_CONNTRACK,
+ CT_TABLE_EXPECT,
+ CT_TABLE_DYING,
+ CT_TABLE_UNCONFIRMED,
+};
+
+static unsigned int check_type(int argc, char *argv[])
+{
+ const char *table = get_table(argc, argv);
+
+ /* default to conntrack subsystem if nothing has been specified. */
+ if (table == NULL)
+ return CT_TABLE_CONNTRACK;
+
if (strncmp("expect", table, strlen(table)) == 0)
- return 1;
+ return CT_TABLE_EXPECT;
else if (strncmp("conntrack", table, strlen(table)) == 0)
- return 0;
+ return CT_TABLE_CONNTRACK;
+ else if (strncmp("dying", table, strlen(table)) == 0)
+ return CT_TABLE_DYING;
+ else if (strncmp("unconfirmed", table, strlen(table)) == 0)
+ return CT_TABLE_UNCONFIRMED;
else
exit_error(PARAMETER_PROBLEM, "unknown type `%s'", table);
@@ -1633,6 +1651,27 @@
return MNL_CB_OK;
}
+static int mnl_nfct_dump_cb(const struct nlmsghdr *nlh, void *data)
+{
+ struct nf_conntrack *ct;
+ char buf[4096];
+
+ ct = nfct_new();
+ if (ct == NULL)
+ return MNL_CB_OK;
+
+ nfct_nlmsg_parse(nlh, ct);
+
+ nfct_snprintf(buf, sizeof(buf), ct, NFCT_T_UNKNOWN, NFCT_O_DEFAULT, 0);
+ printf("%s\n", buf);
+
+ nfct_destroy(ct);
+
+ counter++;
+
+ return MNL_CB_OK;
+}
+
static struct ctproto_handler *h;
int main(int argc, char *argv[])
@@ -1667,6 +1706,16 @@
switch(c) {
/* commands */
case 'L':
+ type = check_type(argc, argv);
+ /* Special case: dumping dying and unconfirmed list
+ * are handled like normal conntrack dumps.
+ */
+ if (type == CT_TABLE_DYING ||
+ type == CT_TABLE_UNCONFIRMED)
+ add_command(&command, cmd2type[c][0]);
+ else
+ add_command(&command, cmd2type[c][type]);
+ break;
case 'I':
case 'D':
case 'G':
@@ -1677,14 +1726,25 @@
case 'C':
case 'S':
type = check_type(argc, argv);
+ if (type == CT_TABLE_DYING ||
+ type == CT_TABLE_UNCONFIRMED) {
+ exit_error(PARAMETER_PROBLEM,
+ "Can't do that command with "
+ "tables `dying' and `unconfirmed'");
+ }
add_command(&command, cmd2type[c][type]);
break;
case 'U':
type = check_type(argc, argv);
- if (type == 0)
+ if (type == CT_TABLE_DYING ||
+ type == CT_TABLE_UNCONFIRMED) {
+ exit_error(PARAMETER_PROBLEM,
+ "Can't do that command with "
+ "tables `dying' and `unconfirmed'");
+ } else if (type == CT_TABLE_CONNTRACK)
add_command(&command, CT_UPDATE);
else
- exit_error(PARAMETER_PROBLEM,
+ exit_error(PARAMETER_PROBLEM,
"Can't update expectations");
break;
/* options */
@@ -1884,6 +1944,28 @@
struct nfct_filter_dump *filter_dump;
case CT_LIST:
+ if (type == CT_TABLE_DYING) {
+ if (nfct_mnl_socket_open() < 0)
+ exit_error(OTHER_PROBLEM, "Can't open handler");
+
+ res = nfct_mnl_dump(NFNL_SUBSYS_CTNETLINK,
+ IPCTNL_MSG_CT_GET_DYING,
+ mnl_nfct_dump_cb);
+
+ nfct_mnl_socket_close();
+ break;
+ } else if (type == CT_TABLE_UNCONFIRMED) {
+ if (nfct_mnl_socket_open() < 0)
+ exit_error(OTHER_PROBLEM, "Can't open handler");
+
+ res = nfct_mnl_dump(NFNL_SUBSYS_CTNETLINK,
+ IPCTNL_MSG_CT_GET_UNCONFIRMED,
+ mnl_nfct_dump_cb);
+
+ nfct_mnl_socket_close();
+ break;
+ }
+
cth = nfct_open(CONNTRACK, 0);
if (!cth)
exit_error(OTHER_PROBLEM, "Can't open handler");
(cherry picked from commit 2cd070dbd7966af448ef38b245bb59c002bbcedb)
Conflicts:
debian/changelog
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It was set to NFCT_HELPER_NAME_MAX (16 bytes), but we have function
names that are larger, eg. nf-nat-follow-master which is 18 bytes
long.
This leads to hitting malformed message while synchronizing
expectations.
I'll add some new constant to libnetfilter_conntrack instead of
hardcoding this, later.
Reported-by: Gaurav Sinha <gaurav.sinha@vyatta.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
(cherry picked from commit 46faeab56cf4117f41cb6f1f1c40a9c18a81372f)
(cherry picked from commit 0cf70ce9b1bcb63d54d9514558b74ae2bde39d9f)
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ignoring ignored addresses during flush
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While adding the expectation support for conntrackd, I accidentally
broke synchrony in 'conntrackd -c' command.
Basically, conntrackd -c should not return control to the shell
until the cache has been committed.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
(cherry picked from commit 7eb63b5872f07903d952aa5cfd6ad0e7647a066a)
(cherry picked from commit 93d244a982f80a691bfb6eb4e17e2cccc32a5cb9)
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Flushing the external cache, ie. conntrackd -f, while commit is in progress
is not allowed anymore, ie. conntrackd -c.
Note that conntrackd -c is synchronous. Thus, it returns control to the
caller once the commit has finished.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
(cherry picked from commit 8648ae6d08bb84030c2c3519454532f6e04e31d9)
(cherry picked from commit 3611b5f5992837224205361c25cfed55c47af8c4)
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pacifica
Conflicts:
include/helper.h
src/expect.c
src/helpers/ftp.c
src/helpers/rpc.c
src/helpers/tns.c
tests/conntrackd/cthelper/main.c
tests/conntrackd/cthelper/run-test.sh
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Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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How to use this helper in a few steps:
1) You can enable this helper via:
nfct helper add rpc inet tcp
nfct helper add rpc inet udp
2) Configure /etc/conntrackd/conntrackd.conf and launch it.
3) You can test this helper locally with the following rule-set:
iptables -A OUTPUT -t raw -p udp -m udp --dport 111 -j CT --helper rpc
iptables -A OUTPUT -t raw -p tcp -m tcp --dport 111 -j CT --helper rpc
iptables -A OUTPUT -p tcp -m state --state NEW,ESTABLISHED -m tcp --dport 111 -j ACCEPT
iptables -A OUTPUT -p udp -m state --state NEW,ESTABLISHED -m udp --dport 111 -j ACCEPT
iptables -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -P OUTPUT DROP
4) Configure NFS and export some local directory. Then, mount it with version 3.
mount.nfs -onfsvers=3 127.0.0.1:/srv/cvs /mnt/
You should see permanent expectations created for this.
Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch adds the user-space helper infrastructure. It also
contains the implementation of the FTP helper in user-space.
There's one example file that you can use to configure conntrackd
as user-space connection tracking helper under:
doc/helper/conntrackd.conf
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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user_space_helpers
Conflicts:
src/cthelper.c
src/helpers/ftp.c
src/helpers/tns.c
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Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch adds the user-space helper infrastructure. It also
contains the implementation of the FTP helper in user-space.
There's one example file that you can use to configure conntrackd
as user-space connection tracking helper under:
doc/helper/conntrackd.conf
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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user_space_helpers
Conflicts:
.gitignore
src/run.c
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Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch adds the user-space helper infrastructure. It also
contains the implementation of the FTP helper in user-space.
There's one example file that you can use to configure conntrackd
as user-space connection tracking helper under:
doc/helper/conntrackd.conf
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch moves the specific ctnetlink code to ctnl.c to prepare
the introduction of the cthelper infrastructure.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch generalizes the select-based file descriptor infrastructure
by allowing you to register file descriptors and its callbacks. Instead
of hardcoding the descriptors that needs to be checked.
Now, struct fds_item contains a callback and pointer to data that is
passed to it:
struct fds_item {
struct list_head head;
int fd;
+ void (*cb)(void *data);
+ void *data;
};
Then, we check which ones are active in the select_main_step() function:
list_for_each_entry(cur, &STATE(fds)->list, head) {
if (FD_ISSET(cur->fd, &readfds))
cur->cb(cur->data);
}
And it invoked the corresponding callback.
I had to slightly modify the channel infrastructure to fit it into
the changes.
This modularity is required for the upcoming cthelper support.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Before this patch, we called accept() to likely return EAGAIN.
This is not required as select() will tell us that we're ready
to accept. Therefore, that early accept() invocation complicates
the whole handling just to get the connection accepted a bit
before.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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nfct-extensions/timeout.c: In function ‘nfct_timeout_cb’:
nfct-extensions/timeout.c:99:2: warning: passing argument 4 of ‘nfct_timeout_snprintf’ makes integer from pointer without a cast [enabled by default]
/usr/include/libnetfilter_cttimeout/libnetfilter_cttimeout.h:114:5: note: expected ‘unsigned int’ but argument is of type ‘struct nfct_timeout *’
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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CC nfct-extensions/timeout.o
../../src/nfct-extensions/timeout.c: In function ‘nfct_cmd_timeout_parse_params’:
../../src/nfct-extensions/timeout.c:40:27: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable]
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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I'll need for the upcoming cthelper infrastructure. Moreover, we avoid
more fragmentation in the netfilter user-space utilities. And the plan
is that `nfct' will replace `conntrack' at some point.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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else, piping "conntrack -E expect" output will be buffered/delayed,
which is not what users expect. Normal conntrack events are already
flushed.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch adds missing information regarding several conntrackd
options to the manpage and the help info that is displayed in the
command line.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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You can use:
ExpectationSync {
ftp
ras
q.931
sip
}
or:
ExpectationSync {
FTP
RAS
Q.931
SIP
}
no matter lower/upper case.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch uses the new infrastructure that allows us to filter
by mark from kernel-space.
This change ensures backward compatibility with kernels with
no support for filtering by mark (Linux kernel <= 3.4.x).
This requires lastest libnetfilter_conntrack library.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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I forgot to modify the body of msg2exp to include the recently
committed support for the expectation class, helper name and NAT.
This patch fixes the problem.
Now in node-1 (primary), it shows:
proto=17 src=192.168.11.4 dst=192.168.10.5 sport=0 dport=5060 mask-src=255.255.255.255 mask-dst=255.255.255.255 sport=0 dport=65535 master-src=192.168.10.5 master-dst=192.168.11.4 sport=5060 dport=5060 PERMANENT class=0 helper=sip [active since 31s]
And it node-2 (secondary), it shows:
proto=17 src=192.168.11.4 dst=192.168.10.5 sport=0 dport=5060 mask-src=255.255.255.255 mask-dst=255.255.255.255 sport=0 dport=65535 master-src=192.168.10.5 master-dst=192.168.11.4 sport=5060 dport=5060 PERMANENT class=0 helper=sip [active since 180s]
This has been tested with the SIP conntrack helper.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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For both conntrack and expectations.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch adds the missing bits to support NAT expectation support.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch adds support for synchronizing the expectation class.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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expectations in XML format."
Generated files got committed by git commit -a, thus reverting the commit.
This reverts commit d8def099fed622b42f7b66468981d6d5c7aac74c.
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expectations in XML format.
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% conntrack -U -u FIXED_TIMEOUT
conntrack v1.0.1 (conntrack-tools): Operation failed: Device or resource busy
With this patch, you can make indeed make it:
% conntrack -U -u FIXED_TIMEOUT
[...]
conntrack v1.0.1 (conntrack-tools): 8 flow entries have been updated.
This patch also adds the corresponding simple QA tests.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch allows you to dump the internal and external expectation
cache in XML.
% conntrackd -i exp -x
<flow><layer3 protonum="2" protoname="ipv4"><expected><src>192.168.1.135</src><dst>130.89.148.12</dst></expected><mask><src>255.255.255.255</src><dst>255.255.255.255</dst></mask><master><src>192.168.1.135</src><dst>130.89.148.12</dst></master></layer3><layer4 protonum="6" protoname="tcp"><expected><sport>0</sport><dport>9082</dport></expected><mask><sport>0</sport><dport>65535</dport></mask><master><sport>50518</sport><dport>21</dport></master></layer4><meta><helper-name>ftp</helper-name></meta></flow>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Now you can dump expectations in XML format and display the timestamp.
conntrack -L exp -o xml,timestamp
<?xml version="1.0" encoding="utf-8"?>
<expect>
<flow><layer3 protonum="2" protoname="ipv4"><expected><src>192.168.1.135</src><dst>130.89.148.12</dst></expected><mask><src>255.255.255.255</src><dst>255.255.255.255</dst></mask><master><src>192.168.1.135</src><dst>130.89.148.12</dst></master></layer3><layer4 protonum="6" protoname="tcp"><expected><sport>0</sport><dport>32877</dport></expected><mask><sport>0</sport><dport>65535</dport></mask><master><sport>49881</sport><dport>21</dport></master></layer4><meta><helper-name>ftp</helper-name><timeout>294</timeout><when><hour>21</hour><min>22</min><sec>09</sec><wday>1</wday><day>22</day><month>1</month><year>2012</year></when></meta></flow>
</expect>
You have to upgrade libnetfilter_conntrack to access this feature.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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If ExpectationSync On is used, we synchronize no expectations at
all due to a problem in the event filtering.
This is bug, this patch fixes the problem.
Reported-by: Gaurav Sinha <gaurav.sinha@vyatta.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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upstream
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1.0.1
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This patch adds support to synchronize expectations between
firewalls. This addition aims to re-use as much as possible
of the existing infrastructure for stability reasons. The
expectation support has been tested with the FTP helper.
This extension requires libnetfilter_conntrack 1.0.0.
If this is the first time you're playing with conntrackd,
I *strongly* recommend you to get working setup of conntrackd
without expectation support before as described in the
documentation. Then, enabling expectation support is rather
easy.
To know more about expectations, if you're not familiar with them,
I suggest you to read:
"Netfilter's Connection Tracking System"
http://people.netfilter.org/pablo/docs/login.pdf
Reprinted from ;login: The Magazine of USENIX, vol. 31, no. 3
(Berkeley, CA: USENIX Association, 2006, pp40-45.)
In short, expectations allow one Linux firewall to filter multi-flow
traffic like FTP, SIP and H.323.
In my testbed, there are two firewalls in a primary-backup configuration
running keepalived. The use a couple of floating cluster IP address
(192.168.0.100 and 192.168.1.100) that are used by the client. These
firewalls protect one FTP server (192.168.1.2) that will be accessed by
one client.
In ASCII art, it looks like this:
192.168.0.100 192.168.1.100
eth1 eth2
fw-1
/ \ FTP
-- client ------ ------ server --
192.168.0.2 \ / 192.168.1.2
fw-2
This is the rule-set for the firewalls:
-A POSTROUTING -t nat -s 192.168.0.2/32 -d 192.168.1.2/32 -j SNAT --to-source 192.168.1.100
-A INPUT -p tcp -m tcp --dport 22 -j ACCEPT
-A INPUT -m state --state INVALID -j DROP
-A FORWARD -m state --state RELATED -j ACCEPT
-A FORWARD -i eth2 -m state --state ESTABLISHED -j ACCEPT
-A FORWARD -i eth1 -p tcp -m tcp --dport 21 --tcp-flags FIN,SYN,RST,ACK SYN -m state --state NEW -j ACCEPT
-A FORWARD -i eth1 -p tcp -m state --state ESTABLISHED -j ACCEPT
-A FORWARD -m state --state INVALID -j LOG --log-prefix "invalid: "
The following steps detail how to check that the expectation support
works fine for conntrackd:
1) You have to enable the expectation support in the configuration
file with the following option:
Sync {
...
Options {
ExpectationSync {
ftp
sip
h323
}
}
}
This enables expectation synchronization for the FTP, SIP and H.323 helpers.
You can alternatively use:
Sync {
...
Options {
ExpectationSync On
}
}
To enable expectation synchronization for all helpers.
2) Make sure you have loaded the FTP helper in both firewalls.
root@fw1# modprobe nf_conntrack_ftp
root@fw2# modprobe nf_conntrack_ftp
3) Switch to the client. Start one FTP control connection to one
server that is protected by the firewalls, enter passive mode:
(term-1) user@client$ nc 192.168.1.2 21
220 dummy FTP server
USER anonymous
331 Please specify the password.
PASS nothing
230 Login successful.
PASV
227 Entering Passive Mode (192,168,1,2,163,11).
This means that port 163*256+11=41739 will be used for the data
traffic. Read this if you are not familiar with the FTP protocol:
http://www.freefire.org/articles/ftpexample.php
3) Switch to fw-1 (primary) to check that the expectation is in the
internal cache.
root@fw1# conntrackd -i exp
proto=6 src=192.168.0.2 dst=192.168.1.2 sport=0 dport=41739 mask-src=255.255.255.255 mask-dst=255.255.255.255 sport=0 dport=65535 master-src=192.168.0.2 master-dst=192.168.1.2 sport=36390 dport=21 [active since 5s]
4) Switch to fw-2 (backup) to check that the expectation has been successfully
replicated.
root@fw2# conntrackd -e exp
proto=6 src=192.168.0.2 dst=192.168.1.2 sport=0 dport=41739 mask-src=255.255.255.255 mask-dst=255.255.255.255 sport=0 dport=65535 master-src=192.168.0.2 master-dst=192.168.1.2 sport=36390 dport=21 [active since 8s]
5) Make the primary firewall fw-1 fail. Now fw-2 becomes primary.
6) Switch to fw-2 (primary) to commit the external cache into the kernel.
root@fw2# conntrackd -c exp
The logs should display that the commit was successful:
root@fw2# tail -100f /var/log/conntrackd.log
[Wed Dec 7 22:16:31 2011] (pid=19195) [notice] committing external cache: expectations
[Wed Dec 7 22:16:31 2011] (pid=19195) [notice] Committed 1 new entries
[Wed Dec 7 22:16:31 2011] (pid=19195) [notice] commit has taken 0.000366 seconds
7) Switch to the client. Open a new terminal and connect to the port that
has been announced by the server:
(term-2) user@client$ nc -vvv 192.168.1.2 41739
(UNKNOWN) [192.168.1.2] 41739 (?) open
8) Switch to term-1 and ask for the file listing:
[...]
227 Entering Passive Mode (192,168,1,2,163,11).
LIST
9) Switch to term-2, it should display the listing. That means
everything has worked fine.
You may want to try disabling the expectation support and
repeating the steps to check that *it does not work* without
the state-synchronization.
You can also display expectation statistics by means of:
root@fwX# conntrackd -s exp
This update requires no changes in the primary-backup.sh script
that is used by the HA manager to interact with conntrackd. Thus,
we provide a backward compatible command line interface.
Regarding the Filter clause and expectations, we use the master
conntrack to filter expectation events. The filtering is performed
in user-space. No kernel-space filtering support for expectations
yet (this support should go in libnetfilter_conntrack at some
point).
This patch also includes support to disable caching and to allow
direct injection of expectations.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Comestical cleanup for better code readability.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This is required to prepare the expectation support.
The master, expect and mask objects that are part of the
conntrack object do not have any reply information. This
allows the expectation support to re-use the existing
filtering infrastructure.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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The ct object that is passed as parameter is not modified,
make it constant.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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We now include one pointer to the object in the extra section.
This is required to generalize this code for the expectation
support. We consume 4-8 bytes extra, but we will not need more
changes to support expectations which is a good idea.
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