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netfilter: nf_conntrack_sip: pass data offset to NAT functions

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When using TCP multiple SIP messages might be present in a single packet.
A following patch will parse them by setting the dptr to the beginning of
each message. The NAT helper needs to reload the dptr value after mangling
the packet however, so it needs to know the offset of the message to the
beginning of the packet.

Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Patrick McHardy
2010-02-11 12:23:53 +01:00
parent 54101f4f3b
commit 3b6b9fab42
3 changed files with 105 additions and 92 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/linux/netfilter/nf_conntrack_sip.h
+10 -4
View File
@@ -34,10 +34,10 @@ struct sdp_media_type {
struct sip_handler {
const char *method;
unsigned int len;
int (*request)(struct sk_buff *skb,
int (*request)(struct sk_buff *skb, unsigned int dataoff,
const char **dptr, unsigned int *datalen,
unsigned int cseq);
int (*response)(struct sk_buff *skb,
int (*response)(struct sk_buff *skb, unsigned int dataoff,
const char **dptr, unsigned int *datalen,
unsigned int cseq, unsigned int code);
};
@@ -100,33 +100,39 @@ enum sdp_header_types {
};
extern unsigned int (*nf_nat_sip_hook)(struct sk_buff *skb,
unsigned int dataoff,
const char **dptr,
unsigned int *datalen);
extern unsigned int (*nf_nat_sip_expect_hook)(struct sk_buff *skb,
unsigned int dataoff,
const char **dptr,
unsigned int *datalen,
struct nf_conntrack_expect *exp,
unsigned int matchoff,
unsigned int matchlen);
extern unsigned int (*nf_nat_sdp_addr_hook)(struct sk_buff *skb,
const char **dptr,
unsigned int dataoff,
const char **dptr,
unsigned int *datalen,
unsigned int sdpoff,
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,
unsigned int dataoff,
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,
const char **dptr,
unsigned int *datalen,
unsigned int sdpoff,
const union nf_inet_addr *addr);
extern unsigned int (*nf_nat_sdp_media_hook)(struct sk_buff *skb,
unsigned int dataoff,
const char **dptr,
unsigned int *datalen,
struct nf_conntrack_expect *rtp_exp,