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[NETFILTER]: nf_conntrack_sip: adjust dptr and datalen after packet mangling

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After mangling the packet, the pointer to the data and the length of the data
portion may change and need to be adjusted.

Use double data pointers and a pointer to the length everywhere and add a
helper function to the NAT helper for performing the adjustments.

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 20:16:54 -07:00
committed by David S. Miller
parent b1ec488b1f
commit 2a6cfb22ae
3 changed files with 60 additions and 51 deletions
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6
include/linux/netfilter/nf_conntrack_sip.h
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@ -24,11 +24,13 @@ enum sip_header_pos {
extern unsigned int (*nf_nat_sip_hook)(struct sk_buff *skb,
enum ip_conntrack_info ctinfo,
struct nf_conn *ct,
const char **dptr);
const char **dptr,
unsigned int *datalen);
extern unsigned int (*nf_nat_sdp_hook)(struct sk_buff *skb,
enum ip_conntrack_info ctinfo,
struct nf_conntrack_expect *exp,
const char *dptr);
const char **dptr,
unsigned int *datalen);
extern int ct_sip_get_info(const struct nf_conn *ct, const char *dptr,
size_t dlen, unsigned int *matchoff,