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[NETFILTER]: nf_conntrack_sip: create signalling expectations

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Create expectations for incoming signalling connections when seeing
a REGISTER request. This is needed when the registrar uses a
different source port number for signalling messages and for receiving
incoming calls from other endpoints than the registrar.

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 20:25:13 -07:00
committed by David S. Miller
parent c978cd3a93
commit 0f32a40fc9
4 changed files with 332 additions and 33 deletions
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18
include/linux/netfilter/nf_conntrack_sip.h
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@@ -5,6 +5,17 @@
#define SIP_PORT 5060
#define SIP_TIMEOUT 3600
struct nf_ct_sip_master {
unsigned int register_cseq;
};
enum sip_expectation_classes {
SIP_EXPECT_SIGNALLING,
SIP_EXPECT_AUDIO,
__SIP_EXPECT_MAX
};
#define SIP_EXPECT_MAX (__SIP_EXPECT_MAX - 1)
struct sip_handler {
const char *method;
unsigned int len;
@@ -59,6 +70,7 @@ enum sip_header_types {
SIP_HDR_TO,
SIP_HDR_CONTACT,
SIP_HDR_VIA,
SIP_HDR_EXPIRES,
SIP_HDR_CONTENT_LENGTH,
};
@@ -75,6 +87,12 @@ enum sdp_header_types {
extern unsigned int (*nf_nat_sip_hook)(struct sk_buff *skb,
const char **dptr,
unsigned int *datalen);
extern unsigned int (*nf_nat_sip_expect_hook)(struct sk_buff *skb,
const char **dptr,
unsigned int *datalen,
struct nf_conntrack_expect *exp,
unsigned int matchoff,
unsigned int matchlen);
extern unsigned int (*nf_nat_sdp_hook)(struct sk_buff *skb,
const char **dptr,
unsigned int *datalen,