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adding code description

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Saeid Bostandoust
2020-01-14 15:48:24 +03:30
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@@ -116,6 +116,7 @@
* [Block Packets From Private Subnets (Spoofing)](#block-packets-from-private-subnets-spoofing) * [Block Packets From Private Subnets (Spoofing)](#block-packets-from-private-subnets-spoofing)
- [Advanced configuration examples](#advanced-configuration-examples) - [Advanced configuration examples](#advanced-configuration-examples)
* [Packet handling in Python using NFQUEUE target](#packet-handling-in-python-using-nfqueue-target) * [Packet handling in Python using NFQUEUE target](#packet-handling-in-python-using-nfqueue-target)
- [ACCEPT all packets from specific source on (filter:INPUT) and DROP everything else](#accept-all-packets-from-specific-source-on-filter-input-and-drop-everything-else)
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@@ -757,14 +758,22 @@ done
iptables -t mangle -A PREROUTING -s 127.0.0.0/8 ! -i lo -j DROP iptables -t mangle -A PREROUTING -s 127.0.0.0/8 ! -i lo -j DROP
``` ```
### Advanced configuration examples ## Advanced configuration examples
#### Packet handling in Python using NFQUEUE target ### Packet handling in Python using NFQUEUE target
> _This target passes the packet to userspace using the nfnetlink_queue handler. The packet is put into the queue identified by its 16-bit queue number. Userspace can inspect and modify the packet if desired. Userspace must then drop or reinject the packet into the kernel._
#### ACCEPT all packets from specific source on (filter:INPUT) and DROP everything else
> _This rule forwards all filter:INPUT packets to queue 1 with NFQUEUE target._
```bash ```bash
iptables -A INPUT -j NFQUEUE --queue-num 1 iptables -A INPUT -j NFQUEUE --queue-num 1
``` ```
> _Script to bind to netfilter queue 1 and handle packets._
```python ```python
#!/usr/bin/python3 #!/usr/bin/python3