23 Jan
2015
23 Jan
'15
10:55 p.m.
Hello,
can you split your checks from nat_uac_test("23") to individual checks
(like nat_uac_test("1"), nat_uac_test("2"), ...) and see which one
fails?
Via parameter 'received' contains (always, as per spec) only the IP
address, rport is for received port. Perhaps adding [] would not harm,
but otherwise should be ok now.
For path module, I pushed a patch. Maybe you can test and report the
results for it.
Cheers,
Daniel
On 23/01/15 12:12, Sebastian Damm wrote:
Hi,
it looks to me that Kamailio detects NAT without NAT being there, when
used in IPv6 scenarios.
I have a register, which comes in like this:
U 2015/01/23 11:42:31.013284 2a01:1234:123:1234::2:16732 ->
2001:9876:98:9876::aa01:5060
REGISTER sip:domain SIP/2.0
Via: SIP/2.0/UDP [2a01:1234:123:1234::2]:16732;branch=z9hG4bK45528eba
After it has run through Kamailio, the packet is sent out like this:
U 2015/01/23 11:42:31.015126 1.2.3.4:5060 <http://1.2.3.4:5060> ->
9.8.7.6:5060 <http://9.8.7.6:5060>
REGISTER sip:domain SIP/2.0
Via: SIP/2.0/UDP
1.2.3.4;branch=z9hG4bK8d21.7fa5fb060c2acc9583f05a93b93f9873.0
Via: SIP/2.0/UDP
[2a01:1234:123:1234::2]:16732;received=2A01:1234:123:1234:0:0:0:2;branch=z9hG4bK45528eba
As far as I know, the received part should only get appended, if the
source IP of the packet differs from the IP advertised in the topmost
Via header. But to me it looks like it always gets appended. In just
IPv4 scenarios, the received parameter only gets appended if a
difference is detected.
And if it gets appended, shouldn't the received parameter IP be in
square brackets, too?
Later on, we have something like this in our code:
if(method=="REGISTER") {
if (nat_uac_test("23")) {
append_hf("X-nathint: nat\r\n");
force_rport();
if (!add_path_received()) {
sl_send_reply("503", "Internal
Path Error");
};
} else {
if (!add_path()) {
sl_send_reply("503", "Internal
Path Error");
};
};
}
In our code, Kamailio always jumps into the add_path_received() part,
so I guess, NAT detection triggers. But why?
And then the Path header appended looks like this:
Path: <sip:1.2.3.4;lr;received=sip:2A01:1234:123:1234:0:0:0:2:16732>
The path module probably doesn't know anything about IPv6, too, so the
IP in the received parameter is not enclosed in square brackets. When
using the Path header later to send packets to the client, Kamailio
complains about a parse error for the destination URI again.
I tried looking into the path module, but I guess my C skills aren't
sufficient to submit a patch.
Best regards,
Sebastian
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Daniel-Constantin Mierla
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