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[NETFILTER]: nf_conntrack_sip: RTP routing optimization

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Optimize call routing between NATed endpoints: when an external
registrar sends a media description that contains an existing RTP
expectation from a different SNATed connection, the gatekeeper
is trying to route the call directly between the two endpoints.

We assume both endpoints can reach each other directly and
"un-NAT" the addresses, which makes the media stream go between
the two endpoints directly.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy
2008-03-25 20:26:43 -07:00
committed by David S. Miller
parent 0d0ab0378d
commit c7f485abd6
3 changed files with 58 additions and 10 deletions
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6
include/linux/netfilter/nf_conntrack_sip.h
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@@ -114,6 +114,12 @@ extern unsigned int (*nf_nat_sdp_addr_hook)(struct sk_buff *skb,
enum sdp_header_types type,
enum sdp_header_types term,
const union nf_inet_addr *addr);
extern unsigned int (*nf_nat_sdp_port_hook)(struct sk_buff *skb,
const char **dptr,
unsigned int *datalen,
unsigned int matchoff,
unsigned int matchlen,
u_int16_t port);
extern unsigned int (*nf_nat_sdp_session_hook)(struct sk_buff *skb,
const char **dptr,
unsigned int dataoff,