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conntrack-tools 1.4.3 release
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conntrack-tools 1.4.2 release
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conntrack-tools 1.4.0 release
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This patch gets the nfct syntax in sync with nft so it looks like this:
nfct <add|delete|...> object ...
instead of:
nfct object <add|delete|...> ...
This patch retains backward compatibility so you can still use the old syntax.
The manpage and tests have been also updated to promote the adoption of this
syntax. We should have little existing clients of this tool as we can only use
this to configure the cttimeout and cthelper infrastructures.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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[...]
CC conntrack.o
In file included from ../include/conntrack.h:4:0,
from conntrack.c:41:
conntrack.c: In function ‘findproto’:
../include/linux_list.h:385:59: warning: right-hand operand of comma expression has no effect [-Wunused-value]
for (pos = list_entry((head)->next, typeof(*pos), member), \
^
[...]
The original patch is from Patrick McHardy <kaber@trash.net>.
Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Signed-off-by: Felix Janda <felix.janda@posteo.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Signed-off-by: Felix Janda <felix.janda@posteo.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Signed-off-by: Felix Janda <felix.janda@posteo.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This new interface supersedes the /proc interface:
/proc/sys/net/netfilter/nf_conntrack_PROTO_STATE_timeout
to tune default conntrack timeout helpers.
# nfct timeout default-get inet tcp
.l3proto = 2,
.l4proto = 6,
.policy = {
.SYN_SENT = 120,
.SYN_RECV = 60,
.ESTABLISHED = 432000,
.FIN_WAIT = 120,
.CLOSE_WAIT = 60,
.LAST_ACK = 30,
.TIME_WAIT = 120,
.CLOSE = 10,
.SYN_SENT2 = 120,
.RETRANS = 300,
.UNACKNOWLEDGED = 300,
},
};
# nfct timeout default-set inet tcp ESTABLISHED 100
As replacement for the existing /proc interfaces for timeout tweaking.
This feature requires a Linux kernel >= 3.13.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch adds an userspace port of the TFTP helper that is currently
implemented in the kernel. This includes NAT support. It requires a
Linux kernel 3.12.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Open the socket from the main function, then pass it as parameter
to the corresponding interpreter.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Add helper function nfct_mnl_talk and use it.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Modularize timeout and helper extensions.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This requires the Linux kernel 3.12.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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new options "--label-add" and "--label-delete" to alter connlabels
assigned to a connection.
Signed-off-by: Clemence Faure <clemence.faure@sophos.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
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- check if ct has label attribute, and at least one label
(bit) is set
- serialize bitmap into array-of-u32, in network byte order
- add code to build new nfct_bitmask object from array-of-u32
Current parse functions don't have length information,
this adds optional parse2() which gets struct netattr pointer.
Attributes that want to use parse2 need to set .maxsize to nonzero
value.
Signed-off-by: Florian Westphal <fw@strlen.de>
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Signed-off-by: Clemence Faure <clemence.faure@sophos.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
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This patch simplifies the expectation filtering by looking up for the
master conntrack. If it does not exists, then we assume that we don't
want this expectation either.
This simplification also fixes the current broken expectation filtering,
since the master conntrack from expectations has neither reply tuple
nor state, however, the filtering code assumes the opposite.
This partially reverts (479a37a conntrackd: fix crash with IPv6 expectation
in the filtering code) since it was incorrectly setting the reply tuple
of the master conntrack.
Thanks to Bill Fink for providing feedback to resolve this issue.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch deprecates the `Family' tweak in the configuration file.
Several reasons for this:
* If not specified, this was default to IPv4 only in table dumps from
the kernel. However, non-IPv4 events were still received. This is
inconsistent.
* It's an early tweak that was not documented (not included in any
of the example files).
If we want to support any sort of consistent filtering based on the
family, this should happen in the filtering code.
After this patch, conntrackd uses AF_UNSPEC to dump the conntrack and
expectation tables from the kernel.
Reported-by: Bill Fink <billfink@mindspring.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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From patchwork Thu Nov 29 13:52:20 2012
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
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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This patch adds the QueueLen option, that allows you to increase
the maximum number of packets waiting in the nfnetlink_queue to
receive a verdict from userspace.
Rising the default value (1024) is useful to avoid hitting the following
error message: "nf_queue: full at X entries, dropping packets(s)".
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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The pr_debug call should be converted to use dlog instead.
I'll try to add some some configuration parameter to
enable/disable debugging in runtime. This is not very flexible.
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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Since Linux kernel >= 3.6.x, we can dump the conntrack statistics
via ctnetlink instead of using the /proc interface:
conntrack -S
cpu=0 searched=9177 found=387086 new=250451 invalid=1 ignore=4 delete=254093 delete_list=5467 insert=1825 insert_failed=0 drop=0 early_drop=0 error=0 search_restart=0
cpu=1 searched=390 found=37493 new=1531 invalid=0 ignore=0 delete=345 delete_list=345 insert=1531 insert_failed=0 drop=0 early_drop=0 error=0 search_restart=0
cpu=2 searched=333 found=68061 new=1895 invalid=0 ignore=1 delete=607 delete_list=607 insert=1896 insert_failed=0 drop=0 early_drop=0 error=0 search_restart=0
cpu=3 searched=71 found=13364 new=1254 invalid=0 ignore=0 delete=75 delete_list=75 insert=1254 insert_failed=0 drop=0 early_drop=0 error=0 search_restart=0
conntrack -S exp
cpu=0 expect_new=9177 expect_create=387284 expect_delete=251141
cpu=1 expect_new=390 expect_create=37496 expect_delete=1531
cpu=2 expect_new=333 expect_create=68117 expect_delete=1895
cpu=3 expect_new=71 expect_create=13366 expect_delete=1255
Note that the output is not backward-compatible, but we fail back to previous
output in case that ctnetlink stats dumping is not available.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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ignoring ignored addresses during flush
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This patch changes the current behaviour of `-t' and `-F' commands,
that results in flushing the kernel conntrack table. With this patch,
the entries that match the Filter clauses in conntrackd.conf are
ignored.
This fixes the situation in which some local ssh connection to the
firewall is lost during the failover (since `-t' is invoked from the
primary-backup.sh script).
Note that the Filter clause tells what entries have to be ignored,
ie. the entries that do not need to be replicated. It makes sense
not to flush entries that are not replicated (usually traffic to
the local firewall).
Reported-by: Gaurav Sinha <gaurav.sinha@vyatta.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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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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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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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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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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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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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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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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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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This patch simplifies cache_get_extra which now takes only one
parameter that is the cache_object. With it, the extra area can be
calculated.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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