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| author | Patrick McHardy <kaber@trash.net> | 2006-11-29 02:35:30 +0100 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2006-12-02 21:31:26 -0800 |
| commit | 1b683b551209ca46ae59b29572018001db5af078 (patch) | |
| tree | 8d88690faf3d819e42719165cae62e9953555140 /include | |
| parent | 77a78dec48386ce958196bf69f192ee76537c07d (diff) | |
| download | linux-1b683b551209ca46ae59b29572018001db5af078.tar.gz linux-1b683b551209ca46ae59b29572018001db5af078.tar.bz2 linux-1b683b551209ca46ae59b29572018001db5af078.zip | |
[NETFILTER]: sip conntrack: better NAT handling
The NAT handling of the SIP helper has a few problems:
- Request headers are only mangled in the reply direction, From/To headers
not at all, which can lead to authentication failures with DNAT in case
the authentication domain is the IP address
- Contact headers in responses are only mangled for REGISTER responses
- Headers may be mangled even though they contain addresses not
participating in the connection, like alternative addresses
- Packets are droppen when domain names are used where the helper expects
IP addresses
This patch takes a different approach, instead of fixed rules what field
to mangle to what content, it adds symetric mapping of From/To/Via/Contact
headers, which allows to deal properly with echoed addresses in responses
and foreign addresses not belonging to the connection.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/netfilter_ipv4/ip_conntrack_sip.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/include/linux/netfilter_ipv4/ip_conntrack_sip.h b/include/linux/netfilter_ipv4/ip_conntrack_sip.h index 51c65ac18c57..bef6c646defa 100644 --- a/include/linux/netfilter_ipv4/ip_conntrack_sip.h +++ b/include/linux/netfilter_ipv4/ip_conntrack_sip.h @@ -6,7 +6,10 @@ #define SIP_TIMEOUT 3600 enum sip_header_pos { - POS_REQ_HEADER, + POS_REG_REQ_URI, + POS_REQ_URI, + POS_FROM, + POS_TO, POS_VIA, POS_CONTACT, POS_CONTENT, |