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+Infrastructure libnfnetlink / libctnetlink
+
+libnfnetlink
+- provides low layer communications between netlink socket and high layer
+ library
+- provides generic functions to create and parse nf_attr's
+- hides all details of netlink socket
+- provides open/close/receive/listen functions only to be used by other
+ libraries (libctnetlink/libpkttnetlink/...)
+
+
+libctnetlink:
+- provides high layer interface for applications interfacing with conntrack
+ kernel code
+- event messages (to be implemented)
+- reading and deleting ip_conntrack's
+- reading, deleting and creating ip_conntrack_expect's
+
+
+
+
+
+Layout of nfnetlink data packet
+
+
+struct nlmsghdr - netlink internal
+struct nfgenmsg - information about