#Iptables netmap dnat code
The code format is similar to the output of the tcpdump -ddd command: one line that stores the number of instructions, followed by one line for each instruction. Pass the BPF byte code format as generated by the nfbpf_compile utility. Iptables -A OUTPUT -m bpf -object-pinned $ -j ACCEPT -bytecode code Then insert the filter in iptables by path: To use a pinned object in iptables, mount the bpf filesystem using object-pinned pathĪpplications load eBPF programs into the kernel with the bpf() system call and BPF_PROG_LOAD command and can pin them in a virtual filesystem with BPF_OBJ_PIN. Expects a path to an eBPF object or a cBPF program in decimal format. This module matches the SPIs in Authentication header of IPsec packets. Matches if the reserved field is filled with zero. This module matches the parameters in Authentication header of IPsec packets. It cannot be specified with the -limit-iface-in option. This option is only valid in the POSTROUTING, OUTPUT and FORWARD chains. The address type checking can be limited to the interface the packet is going out. It cannot be specified with the -limit-iface-out option. This option is only valid in the PREROUTING, INPUT and FORWARD chains. The address type checking can be limited to the interface the packet is coming in. Matches if the destination address is of given type -limit-iface-in Matches if the source address is of given type -dst-type type The following address types are possible: UNSPECĪn unspecified address (i.e. The exact definition of that group depends on the specific layer three protocol. Address types are used within the kernel networking stack and categorize addresses into various groups. This module matches packets based on their address type. If the -p or -protocol was specified and if and only if an unknown option is encountered, iptables will try load a match module of the same name as the protocol, to try making the option available.
The extended match modules are evaluated in the order they are specified in the rule. You can specify multiple extended match modules in one line, and you can use the -h or -help options after the module has been specified to receive help specific to that module. Iptables can use extended packet matching modules with the -m or -match options, followed by the matching module name after these, various extra command line options become available, depending on the specific module. List of extensions in the standard iptables distribution Synopsis
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