Hi, My aim is to a) modify IP Addresses of some SIP headers and SDP message headers ( as SIP traffic passes across my node) and b) also to capture values from some of them. [Basically I want to develop a SIP ALG]. After exploring further, I found that 'SIP connection tracking/NAT' netfilters might help me in achieving this. I have enabled Kernal Loadable Modules "nf_conntrack_sip" and "nf_nat_sip" in my kernel. What I want to know now is-- 1. Is it already proven and tried fact that I can use above KLMs for achieving my purpose? 2. If I need to 'use' these netfilters how to use them? Should I need to run IPTABLES commands from userspace and refer someway to this netfilters ? Any sample commands?? Or 3. Should I need to create a KLM module in kernel space and directly call the APIs available in those netfilters modules [ e.g ..net/ipv4/netfilter/nf_nat_sip.c and ../net/netfilter/nf_conntrack_sip.c] ? If that is the case, how can I pass those captured information towards userspace application? or 4. Is there any alternative way to achieve above, that you are aware of in kernel or userspace ? My kernel details:- Monta vista linux, Release 2.6.32.46 for mips64. [ I am new to kernel programming though I am from SIP background ; hence my questions might involve very basic concepts , apologies for that :) ] Waiting for your suggestions. Regards Honsha -- To unsubscribe from this list: send the line "unsubscribe netfilter" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
