Cleanroom libnl_2 library
By overriding the netlink cache pointer, able to pass nl80211 family id.
Scan and connecting open access point work
Added legal stuff to headers
Change-Id: I1c60452f35fdd1f80edebc03fef33067722d0543
diff --git a/libnl_2/README b/libnl_2/README
new file mode 100644
index 0000000..0e80718
--- /dev/null
+++ b/libnl_2/README
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+Netlink Protocol Format (RFC3549)
++-----------------+-+-------------------+-+
+|Netlink Message |P| Generic Netlink |P|
+| Header |A| Message Header |A|
+|(struct nlmsghdr)|D|(struct genlmsghdr)|D|
++-----------------+-+-------------------+-+
++-----------------+-+-----------------+-+-----------------+-+-----------------+-+---+
+|Netlink Attribute|P|Netlink Attribute|P|Netlink Attribute|P|Netlink Attribute|P|...|
+| #0 Header |A| #0 Payload |A| #1 Header |A| #1 Payload |A| |
+| (struct nlattr) |D| (void) |D| (struct nlattr) |D| (void) |D| |
++-----------------+-+-----------------+-+-----------------+-+-----------------+-+---+
+
+* Each netlink message consists of a bitstream with a netlink header.
+* After this header a second header *can* be used specific to the netlink
+ family in use. This library was tested using the generic netlink
+ protocol defined by struct genlmsghdr to support nl80211.
+* After the header(s) netlink attributes can be appended to the message
+ which hold can hold basic types such as unsigned integers and strings.
+* All data structures in this implementation are byte-aligned (Currently 4 bytes).
+* Acknowledgements (ACKs) are sent as NLMSG_ERROR netlink message types (0x2) and
+ have an error value of 0.
+
+KNOWN BUGS
+* NOT THREAD SAFE!!!
+* nla_parse - does not use nla_policy argument
+* nl_recvmsgs - does not support nl_cb_overwrite_recv()
+* nl_recv - sets/unsets async. flag
+* genl_ctrl_alloc_cache - netlink send/recv funcs should be used
+
+REFERENCES
+* nl80211.h
+* netlink_types.h
+* $LINUX_KERNEL/net/wireless/nl80211.c
+* http://www.infradead.org/~tgr/libnl/doc-3.0/index.html
+* http://www.netfilter.org/projects/libmnl/doxygen/index.html