Login or Register to Ask a Question and Join Our Community


Linux

C, LKM, netfilter, PF_PACKET and ARP.

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Operating Systems Linux C, LKM, netfilter, PF_PACKET and ARP.
# 8  
Old 02-17-2011
I still don't understand the difference between accepting or rejecting packets and accepting or rejecting packets...
# 9  
Old 02-18-2011
Quote:
No, that's not what i want. What i want is to filter the traffic, something like NETFILTER modules do, a way to DROP or ACCEPT frames.
OK, then. Have a look at the code in ebtables.
# 10  
Old 06-13-2011
ARP filter/netfilter
Your problem is that ARP is not an IP protocol, it is a layer below IP. The ethertype is not ip, and as a result, the packets never get into the netfilter hooks. arp is processed by the kernel without the ip layer.

Recent kernels have a config option ARPD that allows for substitution of a daemon for the kernel's arp resolution. That should enable you to do whatever you want to the arp packets.

There is also a BRIDGE_NETFILTER option that enables mac layer firewalls. By creating a virtual device in a bridge configuration you should be able to get those pesky arp packets into the netfilter framework.
Login or Register to Ask a Question

Previous Thread | Next Thread

9 More Discussions You Might Find Interesting

1. Cybersecurity

How to use Netfilter properly with IPv6?

Hello, on a PC with Debian 8 I try to use a Bash script with Netfilter rules so that only traffic goes in and out that is wanted. For that I set all 3 default policies to "drop". The machine uses DHCP to get its IP, gateway and DNS. And I never checked so I was quite surprised that my... (1 Reply)
Discussion started by: SInt
1 Replies

2. Cybersecurity

Experience with libvirt netfilter API

Hi all, I would like to get some ideas and opinions on matter of libvirt netfilter application in KVM environment. I am looking for some easy way to control it with an API and possible experience with that and its performance in real life application. Thanks for all ideas (0 Replies)
Discussion started by: smoofy
0 Replies

3. UNIX for Advanced & Expert Users

problem with netfilter hook function struct skbuff *sock is null..

iam trying to built a firewall.so i have used netfilter for it. in function main_hook sock_buff is returning null and in my log file continuously "sock buff null" is printed plse help to solve this problem.. (using print_string iam printing strings on current terminal (terminal we ping)) ... (1 Reply)
Discussion started by: pavan6754
1 Replies

4. Linux

netfilter / iptables

HI, Is the Netfilter and IPtables same? Thanks & Regards Arun (1 Reply)
Discussion started by: Arun.Kakarla
1 Replies

5. Cybersecurity

Netfilter conntracking for P2P protocols (edonkey, bittorent...)

Hi everyone, I would like to allow multi users to access P2P networks, so I wonder if there's a way to tracking these kind of protocols with netfilter, and also compatibility with nat, like the module conntrack_ftp seems to do with the FTP protocol. Thanks guys. (0 Replies)
Discussion started by: nekkro-kvlt
0 Replies

6. IP Networking

netfilter connection tracking

hi, i'm using tcpreplay to send a traffic trace to my wireless interface (the trace is been captured by the same interface). It seems as netfilter can't trace connections. Is it possible? (0 Replies)
Discussion started by: littleboyblu
0 Replies

7. Programming

extending netfilter...plz help

Hello friends i'm trying to extend iptables to include a target by which we can change the packet type field of a packet. For this i created a kernel module and a userspace extension. Now i face the problem that when i try to invoke iptable with the target i created i get an error message saying... (1 Reply)
Discussion started by: Rakesh Ranjan
1 Replies

8. Programming

Problem in registering new netfilter target module

Friends I'm facing a big problem trying to extend the netfilter. Somone please help me with your quick reply (any hint) as I've to meet a deadline. My problem is that I've written a new netfilter target module and its corresponding userspace program for iptables to change the packet type of a... (0 Replies)
Discussion started by: Rakesh Ranjan
0 Replies

9. Programming

Help in extending netfilter

Hi everybody, I have to write a module for matching in netfilter , extending the netfilter but I'm facing some problems can somebody guide me in that. I know that I need to write matching module working in kernel space and a program in userspace. I went through the HOWTO on netfilter-hacking but... (0 Replies)
Discussion started by: Trusted Penguin
0 Replies
Login or Register to Ask a Question